69 results found.
... Science Frontiers ONLINE No. 106: Jul-Aug 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Fiddling Up Worms When fishing season arrives in Tennessee, L. Harvey does not get out his shovel to dig for worms, he gets out his saw! "Using a dull handsaw, Harvey cut a dead dogwood tree down to a 10-inch stump and then began sawing it lengthwise -- an act of worm fiddling that sounded like someone playing the bassoon, and made the ground purr beneath our feet. "At first, Harvey's sawing seemed to agitate only insects and spiders, but after a while we saw our first fiddled worm. It was 6 inches long, wriggling next to Harvey's boot." Twenty worms at each site are about average with Harvey's fiddling. His fiddled worms are top fish-catchers; the slime they produce even glows in the dark. Harvey is a purist and eschews modern worm-catching technology, such as those popular iron stakes driven into the ground and connected to a car's battery. (Simmons, Morgan; "Making 'Music' with Saw and Stump," Knoxville News-Sentinel, April 21, 1996. Cr. J.A . Caywood) Comment. See SF#65 on how to "grunt" for worms with a driven stake and notched stick -- a variation of Harvey's technique. From Science Frontiers #106, JUL-AUG 1996 . 1996-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 85: Jan-Feb 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Singing Caterpillars Actually, the singing caterpillars are not particularly tuneful. They really generate a vibration that is transmitted through the material they are resting on. You and I cannot hear caterpillar songs, but some ants can, and they are attracted to these insect sirens. The singing caterpillars belong to the Lycaenidae, which include such butterflies as the hairstreaks and blues. It is not only the singing or vibrating of this group of caterpillars that makes them remarkable, it is the complexity of their symbiotic relationships with several species of ants and a plant. Since both the ants and the caterpillars favor the Croton plant, they could well meet by chance, but the caterpillars' singing serves to accelerate contact. Once met on the Croton plant, a fascinating triangle is completed. Player 1. The Croton plant provides nourishment to the caterpillars through both its leaves and specially evolved nectaries (nectar-producing organs), but receives nothing in return. The ants also dote on the nectaries, but they at least protect the plant from all herbivorous insects except the singing caterpillars. Player 2. The ants get food from both the Croton plant and the caterpillars. The latter have evolved extrudable glands called "nectary organs." For their part of the bargain, the ants protect the caterpillar from predatory wasps, just as they defend the Croton plant from its enemies. Player 3. The caterpillars, though seemingly benign, are the heavies in this ...
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... Science Frontiers ONLINE No. 80: Mar-Apr 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Spider Swordplay Ventral view of D. raptor . The claws are on the tips of the bottom two pairs of legs. Greatly enlarged photos reveal them to be wicked-looking fang-like structures. D. raptor, a Hawaiian spider, has lost its ability to spin webs and therewith capture prey. This unusual spider, however, has evolved: ". .. one of the most remarkable morphological features ever found in spiders (immense elongations of the tarsal claws)." These claws, just visible on the two lowermost pairs of legs in the sketch, are employed to skewer passing insects in flight: "The spider is strictly nocturnal, spending most of the activity-period hanging upside down from silk threads. Small insects are snagged directly from the air using a single long claw. For larger insects the spider uses both long claws on legs I, or sometimes all the long claws." (Gillespie, Rosemary G.; "Impaled Prey," Nature, 355:212, 1992.) Comment. Nature has produced many remarkable creatures. They become anomalous only if they cannot be explained as the products of small, random, cumulative mutations. From Science Frontiers #80, MAR-APR 1992 . 1992-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 80: Mar-Apr 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Cricket Coordination In the August 31, 1991, issue of Science News, there appeared an item on the famous synchronously flashing fireflies of Southeast Asia. W. Clements, writing in response to the firefly story, asserts that Indian crickets chirping in unison are much more impressive. He wrote: "I once rode on the back of a truck at night along mountain roads in India. There the crickets sound out quite loudly. The sound swells and diminishes with a persistent beat. As we drove along mile after mile, there was not the tiniest perceptible change in the rhythm. In other words, the insects we listened to at any point were modulating their sound at exactly the same frequency, if not phase, maintained by their contemporaries many miles back. Considering the vast areas that must be represented wherever it occurs, the phenomenon must involve unimaginable millions of insects all acting in concert. This is vastly more impressive than the spectacle of fireflies performing together in a single tree." Picture, if you will, millions, perhaps billions, of crickets all moving their limbs together in unison over many square miles! (Clements, Warner; "Flashy Displays," Science News, 140:323, 1991.) From Science Frontiers #80, MAR-APR 1992 . 1992-2000 William R. Corliss ...
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... 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Depths Of Ignorance Oceanographers have been heard to complain that science knows more about the surface of Mars than it does about the topography of the deep ocean floors. Marine biologists, however, have even more reason to feel slighted. To illustrate, the usual picture painted of the abyssal terrain beyond the continental shelves and slopes is one a a frigid biological desert -- endless plains of sterile muck, broken once in a while by oasis-like deepsea vents, where weird tube worms thrive amidst clouds of chemosynthetic bacteria. This is a highly misleading portrayal. The situation, in fact, recalls what happened when biologists first released clouds of insecticides in rain forest canopies, thus precipitating a deluge of uncataloged insects into collecting nets waiting below. Now, instead of a mere million species of insects worldwide, entomologists are thinking perhaps 10 million or more. Will the same diversity prevail in the deepsea muck? C.L . Van Dover believes so: "Away from the vents, in the great ocean plains, life is much less dramatic and often scaled down to minute proportions -- threadlike worms, tiny snails, delicate, transparent clams. Yet, the diversity of animals in the cold abyssal muds, it now appears, may rival the celebrated biodiversity of the tropical rain forests." We now know virtually nothing about this fauna, how it survives, and how it evolved. Millions of undescribed species may be awaiting discovery by research submersibles and deep dredging. (Van Dover, Cindy ...
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... Science Frontiers ONLINE No. 87: May-Jun 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Fossil Feathers Fly A. Feduccia's cartoon of the bug-catching phase of bird evolution Our alliterative title is apt on two counts: (1 ) Recent research on the famous Archaeopteryx fossils suggest that this animal could indeed fly and was arboreal rather than terrestrial; and (2 ) The paleontologists and ornithologists are still fighting (sometimes emotionally) over how Archaeopteryx fossils should be interpreted. The scientific acrimony centers on whether this ancient bird really evolved from small theropod dinosaurs. Prevailing theory has it that these dinosaurs first evolved feathers to keep warm and then used their feathered "arms" to help capture insects, and so on, with some aimless flapping, to the attainment of true flight. A rival, officially frownedupon theory has it that birds evolved from tree-dwelling reptiles that evolved feathers to break their falls while jumping from branch to branch! [Somehow, neither theory strikes a realistic chord. Why couldn't feathers have evolved solely for the purpose of flight? Answer: because evolutionists cannot countenance purpose in nature. WRC] One reconstruction of Archaeopteryx. There is a remarkable superficial resemblance to the living South American hoatzin. Young hoatzin even sport claws on their wings. Anyway, the latest fusillade in the Archaeopteryx wars was fired by A. Feduccia in Science. Feduccia demonstrated that the claws of Archaeopteryx are sharp and curved like those of modern arboreal birds and quite unlike either terrestrial birds or theropod dinosaurs. In ...
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... Science Frontiers ONLINE No. 86: Mar-Apr 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects How A Fly Hears What A Cricket Hears As we all know, male crickets chirp long and loud for mates from spring until fall. That many males are successful in attracting females is obvious from this insect's population levels. Some of the singing males, however, attract parasitic flies that home in on their songs and deposit their maggots on or near them. Within 10 days, these singers are silent -- they have been consumed by the maggots. The really interesting part of this tale involves the hearing organs of the crickets and flies. Normally, they are radically different in design and frequency of operation. Crickets usually sing at frequencies above 3 kilohertz, and their ears are attuned to these high frequencies. The usual fly, on the other hand, hums and buzzes at only 100-500 hertz (cycles per second). Their ears are duly optimized at these frequencies. The cricket-hunting flies (genus Ormia ), however, would starve to death if they couldn't hear the highpitched cricket songs. Their response was to "evolve" a cricket-type ear so they could home in on their prey. This is a remarkable example of evolutionary convergence. (Robert, Daniel, et al; "The Evolutionary Convergence of Hearing in a Parasitoid Fly and Its Cricket Host," Science, 258:1135, 1992.) Comment. How did the parasitic flies survive until they evolved ...
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... from each other. To accomplish this, the fish must be able to detect time disparities between the two sets of signals less than 1 microsecond long. Their individual electroreceptors are not capable of handling such small time differences. Kawasaki has concluded that the jamming avoidance response can come only from highly sophisticated signal processing in the fish's central nervous system. (Kawasaki, Masashi; "Temporal Hyperacuity in the Gymnotiform Electric Fish Eigenmannia ," American Zoologist , 33:86, 1993.) Comment. Echo-locating bats and dolphins also possess sophisticated data processing apparatus for analyzing the echos they receive back from their prey and surroundings. It will be interesting to discover if evolution has come up with similar organic "components" for handling acoustic and electric signals. Further, we know that some insects have developed ears and sound generators to detect and jam hunting bats. Have the prey of electric fish evolved corresponding countermeasures? If not, why not? From Science Frontiers #89, SEP-OCT 1993 . 1993-2000 William R. Corliss ...
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... This Issue Sourcebook Project Sourcebook Subjects The star of the star-nosed mole (Left) Tenticle-like rays surrounding one nostril of the star-like mole. (Right) The number of rays around the other nostril give the density of sensory receptors. The star-nosed mole is one of North America's more bizarre mammals. Its nostrils are surrounded by mobile, Medusa-like appendages that are richly suppled with nerves and blood vessels. These tentacle-like structures form the "star," which has long been considered a tactile organ used for feeling for prey. However, behavioral experiments by E. Gould et al indicate that the star may be more than a tactile organ. It seems to sport electrical sensors that detect the minute electrical fields surrounding worms, leeches, insect larvae, and other favorite mole tidbits. This conclusion derives from experiments in which starnosed moles preferentially attacked the parts of worms that are most strongly electrical. Actually, scientists have been puzzled as to how this mole found its prey, for this mammal is semiaquatic and somehow locates its dinner in muddy water even though it has poor eyesight. Although some fish possess electrical sensors, they are uncommon in mammals. Half way around the planet, another strange creature, also classified with the mammals, frequents muddy waters looking for the same sort of prey favored by the star-nosed mole. The Australian platypus also has weak vision and employs search techniques similar to those of the mole. Instead of sensor-bearing tentacles on its prow, the platypus has a duck-like bill loaded with ...
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... Science Frontiers ONLINE No. 85: Jan-Feb 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Biology's big bang Representatives of three body plans (phyla): jellyfish (coelenterata); aphid (arthropoda); eohippis (chordata); The title refers to the so-called "Cambrian explosion," that period that began some 570 million years ago, during which all known animal phyla that readily fossilize seem to have originated. The biological phyla are defined by characteristic body plans. Humans, for example, are among the Chordata . Some other phyla are the Arthropoda (insects, crustaceans), the Mollusca (clams, squids), the Nemotada (roundworms), etc. All of these phyla trace their ancestries back to that biologically innovative period termed the Cambrian explosion. Even at the taxonomic level just below the phylum, the class (i .e ., the vertebrates), most biological invention seems to stem from the Cambrian. J.S . Levinton, in a long article in the November 1992 Scientific American, explores the enigma of the Cambrian explosion. Did some unknown evolutionary stimuli prevail 570 million years ago that made the Cambrian different from all periods that followed? Or, has something damped evolutionary creativity since then? Levinton holds that biological innovation has continued unabated at the species level since the Cambrian explosion, but that new body plans; that is, new phyla; have not evolved for hundreds of millions of years. Therefore, something special and very mysterious -- some highly creative ...
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... Science Frontiers ONLINE No. 71: Sep-Oct 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Those Amazing Insects Scientific creationists often point out marvels of biological engineering as proofs that evolution by small chancedirected steps is, to say the least, improbable. A sharp arrow for their qui ver has just appeared in Science. Caterpillar-ant vibrational communication. Some species of caterpillars cannot survive predation unless they are protected by ants. To attract the ants, who just happen to dote on special secretions of the caterpillars, the caterpillars send out vibrational signals across leaves and twigs. In addition to their secretory structures, the caterpillars have also evolved novel vibrators to send out their calls for protection. A few butterfly species from all continents (except Antarctica) have evolved these devices. Looking at this geographical spread, P. J. DeVries thinks that the two sets of organs must have developed independently at least three times . (DeVries, P.J .; "Enhancement of Symbioses between Butterfly Caterpillars and Ants by Vibrational Communication," Science, 248:1104, 1990.) From Science Frontiers #71, SEP-OCT 1990 . 1990-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 71: Sep-Oct 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Nature Communicates In Mysterious Ways Most of us will recall that the wings of butterflies and moths sometimes display eyespots, which, according to current thinking, are designed to startle potential predators. Perhaps so, but butterfly and moth wings can convey a wide range of "signals." K.B . Sandved, a nature photographer, has also found remarkable renditions of all the letters in the English alphabet (one at a time, of course) on the wings of these insects. In fact, he has accomplished this several times over using different species. He has found all the Arabic numerals, too, as well as ampersands, question marks -- you name it! Although Greek pi and capital omega have turned up, butterflies and maths are clearly trying to impress people who utilize the Roman alphabet. After all, it is difficult enough to evolve an ampersand; generating Chinese characters would strain credulity too much. (Amato, Ivan; "Insect Inscriptions," Science News, 137: 376, 1990.) Comments. Incidentally, of what survival value are these wing symbols? Obviously, the butterflies and moths have not got their act completely together as yet. Words and phrases will come soon, we are certain. Look at the eggplants for example. They have specialized in Arabic. It has recently been reported in British newspapers and on BBC Radio 4 that when the Kassam family sliced up an eggplant, ...
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... Science Frontiers ONLINE No. 67: Jan-Feb 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Really-deep rivers "Ecologists studying rivers have discovered a vast subterranean world filled with dozens of previously unknown species of worms, shrimp, insects and microscopic organisms that live in the groundwater below the stream channel and sometimes for miles on each side." The quotation above once again evokes the concept of "crevicular structure" in the crust. The crevicular world is that immense, unappreciated maze of underground space created by cracks in the rocks, solution channels, permeable gravels, and so on. In the article reviewed here, a crevicular realm has been discovered underneath river beds. But this is just a special case of a subterranean world found many places beneath the surface -- even under the continental shelves. The surface waters we see are just (to use an aquatic metaphor) the tip of the iceberg! Sub-river life lives far under the beds of the great Alaskan rivers and even small desert streams in Arizona. Preliminary exploration has shown that fluid-and life-filled crevicular structure exists at least 30 feet under river beds and may extend several miles to either side. For example, water wells drilled two miles from the Flathead River, in Montana, yield immature stoneflies. J. Stanford, Director of Montana's Flathead Lake Biological Station states, "We have basically enlarged the concept of what a river is." He and his colleagues have found at least a dozen new species in the crevicular ...
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... navigation. The outward manisfestation of time-keeping is in the precise timing of the colony's nomadic phase of 15 days (during which larvae are growing) and the 20-day stationary phase (during which pupae develop). The queen's egg-laying also conforms with this schedule. Raids into the rain forest occur in both phases. Perhaps more remarkable is the systematic orientation of the raids in the stationary phase. These raids are separated by an average 123 , as diagrammed. This scattering allows time for new prey to enter the previously raided areas. But how does the colony determine direction in the dense rain forest? Probably from polarized sinlight, thinks Franks. But here we have a problem: each army ant, instead of having multi faceted compound eyes like most insects, has just a single facet in each eye. "The mystery is how the colony can navigate with each of its workers having such rudimentary eyesight. In my wildest dreams, I imagine that the whole swarm behaves like a huge compound eye, with each of the ants in the swarm front contributing two lenses to a 10- or 20-m wide 'eye' with hundreds of thousands of facets." (Franks, Nigel R.; "Army Ants: A Collective Intelligence," American Scientist, 77:139, 1989.) Comment. By analogy, the human body is a colony of individual cells, most of which are specialized in some way. Individual human cells can be grown alone, but they are as directionless as the 100 ants on the flat ...
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... Science Frontiers ONLINE No. 74: Mar-Apr 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects 'TERMITE BANDS' IN SOUTH AFRICA Few animals besides man have significantly affected our planet's geology. To be sure, corals built the Great Barrier Reef and beavers left their mark on the hydrology of parts of Canada and the U.S .; but termites!? It seems that in southern Africa this industrious insect is responsible for enormous striped patterns of ridges and vegetation bands. These amazingly regular patterns are caused by alternating low ridges and gullies. The ridges are about 2 meters high, up to a kilometer long, and separated by about 50 meters. The ridges themselves are closely spaced termite mounds. Just why the termites choose to build their mounds in long rows is an unanswered question. And how do the termites maintain strict parallelism, especially since they are blind? How could termites in one mound know how their neighbors in the nearest ridge, 50 meters away, are building their mounds? Anyway, the ridges help channel the flow of water and thus the growth of vegetation, giving immense swathes of country a corrugated appearance. (Sattaur, Omar; "Termites Change the Face of Africa," New Scientist, p. 27, January 26, 1991.) Comment. In Australia, the so-called "magnetic" termites build their slab-like mounds so as to minimize the amount of sun-generated heat. From Science Frontiers #74, MAR-APR 1991 . 1991-2000 ...
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... Science Frontiers ONLINE No. 54: Nov-Dec 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The insects' revenge Plants may fool some insects with their mimicry and deter others with toxic chemicals, but the insects have their tricks, too, as seen in the following item from Science: "Many mandibulate insects that feed on milkweeds, or other latex-producing plants, cut leaf veins before feeding distal to the cuts. Vein cutting blocks latex flow to intended feeding sites and can be viewed as an insect counteradaptation to the plants' defensive secretion." (Dussord, David E., and Eisner, Thomas; "Vein-Cutting Behavior: Insect Counterploy to the Latex Defense of Plants," Science, 237:898, 1987.) Comment. Right now, even as we write this, the plants are evolving counterploys -- high-voltage veins perhaps! But this may not work. See the final item in this section. From Science Frontiers #54, NOV-DEC 1987 . 1987-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 54: Nov-Dec 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Honest, this is the last "plant" item!In the September issue of Scientific American, S.C .H . Barrett presents an excellent review of mimicry in the plant world. All sorts of wondrous mimicry are described, involving form, color, odor, texture and even synchrony of life cycles. Plants mimic insects, stones, other plants, and substrates (backgrounds). Repeatedly, Barrett asserts that all of these remarkable developments are the consequence of small, randome mutations guided by the forces of natural selection. To Barrett, plant mimicry is proof positive that evolution is true. It should not surprise the readers of Science Frontiers that this very same article is a goldmine of biological anomalies, that is, data that seem to challenge ruling paradigms. (Barrett, Spencer C.H .; "Mimicry in Plants," Scientific American, 257:76, September 1987.) Comment. Evolution, like beauty, must be in the eye of the beholder! At this point, we could easily launch into a lengthy harangue about why it seems highly improbable that a plant, through chance mutations, could hit upon just the right combination of form, color, odor, and flowering time to dupe an insect pollinator -- even with the aid of natural selection and a billion years. The point we wish to stress here is that the author of this paper sees the same facts and comes to ...
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... Science Frontiers ONLINE No. 63: May-Jun 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Caterpillars That Look Like What They Eat While E. Greene was studying insecteating birds, he was startled when an oak tree catkin started to crawl away from him. The crawling catkin turned out to be a cleverly camouflaged caterpillar ( Nemoria arizonaria ). When these caterpillars start eating oak catkins in the spring, they soon take on the golden color and fuzzy appearance of the catkins. However, the second brood, which matures after the catkins have disappeared, develop instead a twig-like appearance after consuming oak leaves. Thus, both broods acquire the proper protective camouflage for each season. Experiments show that plant chemicals control the appearance of the caterpillars. (Green, Erick; "A Diet-Induced Developmental Polymorphism in a Caterpillar," Science, 243:643, 1989. Also: Wickelgren, I.; "Caterpillar Disguise; You Are What You Eat," Science News, 135: 70, 1989.) Comment. Is it naive to wonder why the oaks contribute to their own destruction by providing the caterpillars with chemicals that help conceal them from predators? Plants are usually very clever about producing insect-discouraging chemicals in their leaves. One would expect that "evolutionary forces" would have produced chemicals that would have made the caterpillars more obvious to their predators instead of visa versa. From Science Frontiers #63, MAY-JUN 1989 . 1989-2000 William R. Corliss ...
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... Jan-Feb 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Biological Diversity Crisis If life fills all available energy niches, life must be capable of transforming itself (or of being transformed) into a multitude of different energy transducers or energy utilizers. E.O . Wilson has outlined the diversity of terrestrial life in a recent issue of BioScience. The earth, it appears, is a veritable Gene sis Machine; and it is only one planet among a possible infinitude. So many terrestrial species have already been described that one could easily believe that biological collectors roaming the planet's wild places have just about completed their task. Some recent totals: 47,000 species of vertebrates, 440,000 plants, and 751,000 insects. But we may not even be close to grasping life's diversity on earth! We do well in counting the large mammals and birds, but most insects and microscopic forms of life have escaped description. To illustrate, in 1964, the British ecologist C.B . Williams, combining intensive local sampling and mathematical extrapolation, extimated the insect population as 3 million species. However, by 1985, this figure has been raised ten-fold to 30 million species. Why the huge jump? For the first time, entomologists had found a way to efficiently sample the canopies of tropical forests. This rich stratum between the sunlight and gloomy forest floor 100+ feet below had been largely neglected before. The slick tree trunks and the attacking swarms of wasps and stinging ants deterred the ...
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... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects How Cancers Fight Chemotherapy How do cancer cells develop resistance to lethal chemicals? The clues seem to reside in extrachromosomal DNA that carries drug-resistance-conferring genes from one cancer cell to another. Cancer cells dying from chemotherapy may, for example, cast off extrachromosomal DNA that carries information on how to combat the chemicals. Other factors may also be at work, but basically we have only suspicions. (Silberner, Joanne; "Resisting Cancer Chemotherapy," Science News, 131:12, 1987.) Comment. Insects and other organisms also acquire resistance to chemical poisons. Does extrachromosomal DNA play roles in these instances, too? Can Information coded in extrachromosomal DNA be passed from one species to another, say, via insect bites? From Science Frontiers #50, MAR-APR 1987 . 1987-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 46: Jul-Aug 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Are fruit bats primates?The profound differences between the fruit bat (megabats) and echo-locating, insect-eating bats (microbats) were mentioned above. The primate-like eye-brain system of the fruit bats suggests two possibilities: 1. Primitive bats first developed flight and then the fruit bats developed their primate-like eye-brain systems through "convergent evolution"; or 2. The fruit bats inherited their eye-brain system from closely re lated primates and then developed flight through "convergent evolu tion." R.D . Martin, a physical anthropologist and author of this article, has reviewed the morphological characteristics of the fruit bats and primates. On this basis, he doubts that the fruit bats are pri-mates. Furthermore, molecular studies are also negative. Therefore, possibility #1 above is the more likely one. (Martin, R.D .; "Are Fruit Bats Primates?" Nature, 320:482, 1986.) Comment. In either case, #1 or #2 , we must acknowledge convergent evolution and the likelihood that some subroutine in the genetic code repeats itself in divergent species. Speculative as always, we must ask if the genetic instructions for human or even superhuman intelligence do not reside dormant-for-now in other species. Reference. For more on megabat similarities to primates, go to BMC4 in the catalog volume: Biological Anomalies: ...
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... Science Frontiers ONLINE No. 45: May-Jun 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Bats may have invented flight twice (at least!)Bats are divided into megas and micros. The "megabats," represented by the fruit bats, possess an "advanced" connection between their eyes and midbrains. No other mammals except the primates possess this type of advanced visual organization. In contrast, the "microbats," the common echo-locating insect-eaters have a "primitive" eyebrain connection. This deep division in the bat family -- mega/micro, vegetarian/carnivorous, sight-dependent/echolocating -- suggests that mammal flight has developed at least twice. (Pettigrew, John D.; "Flying Primates? Megabats Have the Advanced Pathway from Eye to Midbrain," Science, 231: 1304, 1986.) Reference. The problems of bat evolution can be found at BME1 in our catalog Biological Anomalies: Mammals II. Ordering information here . From Science Frontiers #45, MAY-JUN 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 45: May-Jun 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Scant Ant Chromosomes The Australian ant Myrmecia pilosula, called the "bulldog ant" because of its viciousness, carries all its genetic information in a single pair of chromosomes. (Males are haploid and have just one chromosome.) Although classified as a "primitive" ant, the bulldog ant exhibits complex social behavior and is obviously far from a simple biological entity. Biologists were therefore surprised to find all genetic instruction residing in a single chromosome pair. Social insects tend to have higher chromosome numbers. It is also interesting that Myrmecia pilosula, originally described as a single species, actually consists of several distinct sibling species with chromosome numbers (i .e ., pairs) of 9, 10, 16, 24, 30, 3l, and 32. Yet, they all look pretty much alike. (Crosland, Michael W.J ., and Crozier, Ross H.; Myrmecia pilosula, an Ant with Only One Pair of Chromosomes," Science, 23l:1278, 1986.) Comment. Chromosome number or the sheer quantity of genetic material seems poorly correlated with biological complexity. From Science Frontiers #45, MAY-JUN 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 42: Nov-Dec 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Trees may not converse after all!Back in SF#27, we reported how some evidence suggested that trees might communicate with one another in connection with insect attacks. S. V. Fowler and J.H . Lawton contest this conclusion, and they have experimental evidence to back them up. Working with birch trees, they defoliated saplings 5% and 2s% and looked for signs of intertree communication. They found none. As for previous claims for this phenomenon, Fowler and Lawton believe that one study was statistically flawed, and the other due to an infectious disease transmitted between caterpillars rather then talking trees. (Fowler, Simon V., and Lawton, John H.; "Rapidly Induced Defense and Talking Trees: The Devil's Advocate Position, " American Naturalist, 126:181, 1985.) From Science Frontiers #42, NOV-DEC 1985 . 1985-2000 William R. Corliss ...
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... the size of the cosmic pond is vastly greater than any terrestrial puddle. The above quotation is from V.I . Goldanskii who, even before Hoyle, suggested a cold prehistory of life, during which complex organic molecules were synthesized at just a few degrees above absolute zero. His article dwells primarily on the physics of the tunnelling phenomenon, which is well verified in the laboratory, but he does not shrink from the biological implications. (Goldanskii, Vitalii I.; "Quantum Chemical Reactions in the Deep Cold," Scientific American, 254:46, February 1986.) Comment. In the first few paragraphs you can almost hear the theme music from the movie 2001. Evolutionists sometimes get carried away in inventing protobirds. This specimin was developing feathers on its forelimbs to help catch insects. The illustration comes from Evolution: A Theory in Crisis, by M. Denton. It is published in England, and we are trying to get copies. From Science Frontiers #44, MAR-APR 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 49: Jan-Feb 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Grounded Bats Nicheless New Zealand boasts two bat species (Mystacina) which can fly but really prefer to clamber around on the ground hunting for insects, pollen, and fruit. So far, these bats have defied classification. They are distinctly different from their flying cousins in the area. Blood protein analysis links them to tropical bats in South America. No oth-er bats from New Zealand and Australia show such a relationship. Although these two oddball species may have flown in from South America some 80 million years ago, when the land masses were thought to be much closer, one then has to explain how these tropical bats survived the Ice Ages that afflicted New Zealand. (Anonymous; "Grounded Bats," New Scientist, p. 25, October 2, 1986.) From Science Frontiers #49, JAN-FEB 1987 . 1987-2000 William R. Corliss ...
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... the above. We have a different story to tell. These blips, representing queries and responses, are not generated by human-built radars or by electrical fish, but rather by animals much 'lower' on the evolutionary ladder -- fireflies. This illustration is Fig. 3 in a lengthy review article and carries the following unilluminating caption: "Examples of Entrainment of femme C's (see Table 3) Responses to Multiple Counterfeit Flashes." It seems that we have some sort of electronic warfare between the femme (predatory female fireflies that lure other fireflies with false signals) and the preyed-upon species. The many pages describe all sorts of feints, verification signals, and other stratagems. (Carlson, Albert D., and Copeland, Jonathan; "Communication in Insects," Quarterly Review of Biology, 60:415, 1985.) Comment. It is impossible to do justice to this paper in this short review, but two things should be mentioned: (1 ) Fireflies may be considered "low" on the evolutionary ladder, but their tiny brains certainly process a lot of data in complex ways; and (2 ) In southeast Asia, massed fireflies flash in synchronism along some riverbanks, creating one of the great spectacles of nature. See our Handbook Incredible Life for details. For a description of this book, visit: here . From Science Frontiers #44, MAR-APR 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 44: Mar-Apr 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Evolving on half a wing (and a prayer?)Just about everyone agrees that half a wing is of little use to an animal "straining" to develop the capability of flight. So, how did the marvelously crafted wings of birds, insects, and mammals evolve in infinitesimal steps? Biologists, including Darwin himself, have long puzzled over this. Stephen Jay Gould in a recent article explores a currently favored way of circumventing the negligible additional survival value of half a wing, or even 90% of a wing. This solution (? ) maintains that protowings were not "intended" for flight at all but were developed initially as aerodynamic stabilizers, thermoregulatory systems, sexual attractors or other functions requiring large areas. Gould describes the experiments of Kingsolver and Koehl in which protowings were modelled and tested for their thermoregulatory and flight values. Surprisingly, there was a sharp transition, as the size of the protowing increased, from good thermoregulation but poor flight capability to the reverse -- good flight capability and poor thermoregulation. In other words, a structure developed for one purpose, if enlarged, might be useful for something else! (Gould, Stephen Jay; "Not Necessarily a Wing," Natural History, 94:14, October 1985. See also: Lewin, Roger, "How Does Half a Bird Fly?" Science, 230:530, 1985.) Comment. The work of Kingsolver and Koehl ...
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... "Gallery" pages of Discover, several incredibly colored and patterned shrimp stun the eyes of the reader. Some of these shrimp put the gaudiest butterflies and birds to shame. We won't stop here to dwell on why some shrimp are so colorful while others are so tasty. The anomaly at hand is buried in the caption describing the red-andwhite striped peppermint shrimp, which decorates the Great Barrier Reef. It turns out that this shrimp, like the Atlantic spiny lobster, sometimes joins up with others of its species to form long moving trains or chains of animals. This behavior remains very puzzling to biologists. (Anonymous; "Shrimp You Won't Find in Your Cocktail," Discover, 6:55, March 1985.) Comment. Do shrimp belong with the insects? Yes, they are all arthropods. From Science Frontiers #39, MAY-JUN 1985 . 1985-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 33: May-Jun 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Prisoners Of The Boundary Layer Wings were an inspired evolutionary development. They permit the geographical dispersal of many species, especially insects. But nature, ever-innovative, has other aeronautical techniques up her sleeve. Consider the tiniest insects that do not possess wings. It is difficult for large animals like ourselves to realize that these tiny creatures are actually prisoners of the so-called "boundary layer" of air hugging all surfaces. The thin boundary layer is stagnant very close to the surface. Any tiny in-sect wishing to take advantage of wind-dispersal to propagate the species farther afield must somehow breach this layer. Some of the scale insects have in their instar phases developed the trick of rearing up on their hind legs, penetrating the boundary layer, and presenting a high-drag surface to the wind. (Many climb along plant surfaces inside the boundary layer to exposed areas before exhibiting this behavior.) The wind plucks them off the plant and carries them off to new territories. The authors think this may be convergent evolutionary strategy for many minute insects. (Washburn, Jan O., and Washburn, Libe; "Active Aerial Dispersal of Minute Wingless Arthropods.....," Science, 223:1088, 1984.) Comment. The fact that these insects are shaped like airfoils (i .e ., aircraft wings) is also interesting. Scale insects (first instar phase). ...
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... -Dec 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Hot Plants You've heard of hot potatoes, but they aren't naturally hot. However, in the early spring skunk cabbages are and so are some philodendrons during their flowering periods. In fact, some philo-dendrons burn fat to generate their heat, just like animals. Metabolism based on fats allows some philodendrons to reach temperatures of 124 F. In terms of their rates of metabolism, they rival those of the humming birds. Further-more, philodendrons can regulate their chemical fires, whereas skunk cabbages, which burn only starch, consume all their stored energy like a rocket in one snow-melting crescendo. Why do plants generate heat? Apparently to attract pollinating insects. The hot skunk cabbage poking through the snow is the only food in sight for early spring insects, while the philodendrons may attract pollinating insects who like to bask or mate in warm places. (Blakeslee, Sandra; New York Times, August 9, 1983, p. C4. Cr. P. Gunkel) Comment. Are plants really "lower" forms of life? From Science Frontiers #30, NOV-DEC 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 26: Mar-Apr 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Prescient Evolution Lately, a fossil moth egg was found in 75-million-year-old sediments in Massachusetts. The egg is positively assigned to the moth family Noctuidae and extends the fossil record of this family back into the Cretaceous. So what? Well, it turns out that Noctuidae family moths have special organs for detecting the ultrasonic cries of insect-hunting bats. The fossil record of the bats, however, only goes back to the early Eocene, perhaps 20 million years after the Noctuidae moths. Since no other insect predators like bats existed, it would seem that the moths developed these special organs in anticipation of the bats! (Gall, Lawrence F., and Tiffney, Bruce H.; "A Fossil Noctuid Moth Egg from the Late Cretaceous of Eastern North America," Science, 219:507, 1983.) Comment. Do humans have talents that seem unimportant now but which may be useful some day? Calculating prodigies, eidetic imagers, etc. From Science Frontiers #26, MAR-APR 1983 . 1983-2000 William R. Corliss ...
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... . He finds that these cetaceans tend to run aground at spots where the earth's magnetic field is diminished by the local magnetic fields of rocks. These coastal magnetic lows are at the ends of long, continuous channels of magnetic minima that run for great distances along the ocean floors. Kirschvink believes that the stranded whales and dolphins were using these magnetic troughs for navigation and failed to see the stop sign at the beaches and ran aground. The mag-netic troughs in this view are superhighways for animals equipped with a magnetic sense. If Kirschvink's theory is correct, the magnetic sensors of the whales and dolphins are extremely sensitive, because the deepest magnetic troughs are only about 4% weaker than the background magnetic field. Magnetite crystals have been found in birds, fish, and insects, where they are thought to contribute to a magnetic sense of some sort. So far, no magnetite has shown up in whales and dolphins. (Weisburd, S.; "Whales and Dolphins Use Magnetic 'Roads,' Science News, 126:389, 1984.) From Science Frontiers #38, MAR-APR 1985 . 1985-2000 William R. Corliss ...
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... -cet fluke which infests ants and then sheep. The problem is that sheep don't normally eat ants, giving the flukes a chance to switch vehicles. So, the innovative flukes somehow force the ants to crawl to the tops of plants and lock themselves there with their jaws. The next hungry sheep that comes along has his meal seasoned with ants. The bulk of the present article deals with thorny-headed worms, which are not as endearing as the lancet flukes. These parasites are merely bags of reproductive organs attached to a thorny probiscus, by which they attach themselves to the intestinal walls of vertebrates. Living in a sea of processed nutrients, the worms don't even have a digestive tract. Part of the life cycle of this parasite is spent in arthropods (insects, crustaceans). As with the lancet fluke, the thorny-headed worm's big challenge is getting the arthropod eaten by a vertebrate. In most instances, it alters the behavior of the arthropod in a way that makes it more conspicuous to the predators. For example, infested pill bugs do not hide from birds, as they normally do, and are snapped up. Infested crustaceans move towards the light where ducks consume them. No one knows how a parasite floating in the body cavity of its host can control the host's behavior. (Moore, Janice; "Parasites That Change the Behavior of Their Host," Scientific American, 250:108, May 1984.) Comment. One cannot but wonder if human behavior is somehow controlled by parasites. Obviously ...
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... were sufficient to produce a progression of visual hallucinations from simple geometric images to complex memory images coupled with dissociation. The other 23 victims, subjected to similar conditions but without isolation and life-threatening stress, did not experience hallucinations. The hostage hallucinations are compared to those resulting from sensory deprivation, near fatal accidents, and other states of isolation and stress. A common mechanism of action based on entopic phenomena and CNS (central nervous system) excitation and arousal is suggested." In a typical case, an 18-year-old female college student was kidnapped and held for ransom. She was bound, blindfolded, and denied food, water, and toilet facilities. She was periodically threatened with death. She saw dull flashes of light in front of her eyes and small animals and insects on the periphery of her visual field. Becoming hypervigilant, she heard strange sounds and whispers. Hearing loud noises, she thought her captors were coming to kill her. It was then her whole life ran off like a slide show before her eyes. The noises were the police coming to rescue her. (Siegel, Ronald K.; "Hostage Hallucinations," Journal of Nervous and Mental Disease, 172:264, 1984.) Comment. Some of the hostages experienced the tunnel hallucination so common in near-death visions. These seemingly 'built-in' or hard-wired images may be related to UFO and sea-serpent phenomena. From Science Frontiers #34, JUL-AUG 1984 . 1984-2000 William R. Corliss ...
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... . Since bats have but two ears, one wonders how they can develop a three-dimensional image from a two-dimensional sensor; ie., two ears give right-and-left information only. The moustache bat makes up for this deficiency by generating echo-locating pulses at three distinct harmonics: 30, 60, and 90 kilohertz. Its external ears are so shaped that each of these three frequencies has a different acoustic axis, giving the bat in effect three separate sets of ears pointing in three different directions. Inside the bat's head, in the inferior colliculus of the brain, are three sepa rate sets of neurons sensitive to the three different frequencies. No one knows how the bat processes such information into a "display" it can use in swooping after insects at night. (Anonymous; "The Ins and Outs of a Bat's Ears," New Scientist, 20, August 30, 1984.) Reference. For more on bat navigational prowess, see section BMT3 in our catalog: Biological Anomalies: Mammals II. This volume is described here . The three acoustic axes of the moustache bat. From Science Frontiers #36, NOV-DEC 1984 . 1984-2000 William R. Corliss ...
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... common errors, senses unusual and unexpected events, and responds to them, often by restructuring the genome. We know about the components of genomes that could be made available for such restructuring. We know nothing, however, about how the cell senses danger and instigates responses to it that often are truly remarkable." Thus Barbara McClintock ends the paper she delivered in Stockholm when she received a Nobel Prize in 1983. Most of McClintock's paper reviews her pioneering work with the corn genome, but she adds some examples of other genomic responses to external stresses. One such stress is applied to an oak tree when a wasp lays its egg in a leaf. The stress causes the oak genome to reprogram itself and construct a wholly new and unplanned plant structure to house and feed the developing insect. Some of these structures (galls) are very elaborate and are precisely tailored to each different wasp species. From such examples, it is apparent that the genome of an organism somehow perceives stresses and reacts to them -- often in completely unanticipated ways. The stresses may be mechanical, thermal, chemical; in fact, almost anything. McClintock's conclusion is: ". .. that stress, and the genome's reaction to it may underlie many formations of new species." (McClintock, Barbara; "The Significance of Responses of the Genome to Challenge," Science, 226:792, 1984.) Comment. The implications here are broad and deep. Evolution can be driven by external stresses. The new species thus produced may differ substantially from the ...
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... Science Frontiers ONLINE No. 5: November 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Obscure Origin Of Insects And Their Wings The earliest fossil insect is a wingless springtail found in Scotland's Devonian cherts, which conventional dating schemes tell us are about 350 million years old. Some biologists doubt that springtails should be classified as true insects. In any event, these ancient springtails are considered too specialized to be the ancestors of modern winged insects. The next insects in the fossil record appear suddenly in the Upper Carboniferous (300 million years ago) with fully developed wings. There exists an embarrassing 50-million-year gap between the fossil springtails and the more specialized insects. Evolution requires that this gap be filled with many random experiments at insect construction, including the first attempts at fashioning wings. Whalley admits the gap and the total mystification of paleontologists about how insects and biological flight first developed. Perhaps, he surmises, wings may have been the natural extrapolation of flap-like outgrowths required for body cooling. Random mutations would have added the muscles needed to orient the flaps and move them to improve circulation! (Whalley, Paul; "Derbyshire's Darning Needle," New Scientist, 78:740, 1978.) From Science Frontiers #5 , November 1978 . 1978-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 16: Summer 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Plants Manufacture Fake Insect Eggs Plants are usually considered rather passive to environmental forces, but careful observation show that they fight back against predators in subtle ways. Williams and Gilbert, for example, have found that a number of Passiflora species, which are heavily defoliated by the larvae of Heliconius butterflies, have developed tiny structures that closely resemble in size, shape, and color the eggs of these butterflies. Heliconius butterflies, when searching for likely plants on which to lay eggs, tend to avoid plants that already have eggs on them. The plants' fake eggs, then, help protect the plant from predation. (Williams, Kathy S., and Gilbert, Lawrence E.; "Insects as Selective Agents on Plant Vegetative Morphology....."; Science, 212:467, 1981.) Comment. We have heard over and over again about Nature's "marvelous adaptations," but it is still difficult to imagine chance-driven evolution of fake eggs of just the right size, shape, and color. How many shapes and colors were tried before the plants got it right? From Science Frontiers #16, Summer 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 12: Fall 1980 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Oh, those clever plants The Lecythidaceae or Brazil nut family is pantropical in distribution. Some members of this family produce two dif ferent kinds of pollen: (1 ) normal pollen for fertilization; and (2 ) nongerminating pollen that is collected by insects for food. The latter variety of pollen is considered (anthropomorphically) as the plant's way of rewarding insects for carrying the fertile pollen to other plants. As in so many of Nature's remarkable adaptations, the two types of pollen are located in exactly the right portions of the flower to match the anatomy of the foraging insect. In the figure, a carpenter bee collects infertile pollen from the bottom of the flower while being dusted on the head and back by the regions of the fertile pollen. (Mori, Scott Alan, et al; "Intrafloral Pollen Differentiation in the New World.. .. ." Science, 209:400, 1980.) Comment. How can the flower, even over many generations, determine that only the pollen from the upper portion is being used for fertilization and that the lower area of pollen may safely "be allowed" to become infertile? From Science Frontiers #12, Fall 1980 . 1980-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 7: June 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects What drummer do periodical cicadas hear?Periodical cicadas have the longest life cycles of the insects. Every 13 or 17 years they emerge in vast numbers. How did such long life cycles evolve? How is such precise periodicity maintained. Evolutionists answer the second question with ease. Periodical cicadas are successful in life because their overwhelming numbers, at such widely separated times, completely saturate the appetites of predators, whose populations are not synchronized with the cicada's . Any deviant cicadas emerging a year or so early or late are quickly snapped up, thus promoting synchronicity. So far, so good; but how did such a novel method of coping with predators evolve? There seems to be no way that the cicada's "adaptive peak" of evolutionary success could have been attained from an initial nonperiodic origin. In other words, the cicada cyclic prison is so strong that evolutionists cannot imagine how the prison was made in the first place. (May, Robert M.; "Periodical Cicadas," Nature, 277:347, 1979.) Comment. Was it a giant, blind evolutionary step that just happened to succeed? From Science Frontiers #7 , June 1979 . 1979-2000 William R. Corliss ...
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... different species of bacteria in physical contact, thus stirring the evolutionary pot. Until recently, scientists believed that the higher organisms, the eukaryotic species, including you and me, did not indulge in such "horizontal" traffic between species. But a few cases have now been found, one involving humans and a microorganism associated with tumors. And the search is just beginning, as biologists look for something they never thought of looking for before. (Lewin, Roger; "Can Genes Jump between Eukaryotic Species?" Science, 217:42, 1982.) Comment. This apparent short-circuiting of classical heredity channels supports the radical notion that evolutionary blueprints may be transmitted between divergent species. In the long view, may-be we should not malign viruses, germs, and biting insects! From Science Frontiers #23, SEP-OCT 1982 . 1982-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 3: April 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Predaceous insect larvae don " sheep's clothing"The larva of the green lacewing lives in colonies of the wooly alder aphid upon which it feeds. The aphids, however, are protected by "shepherd" ants which normally remove any undisguised predatory larva. To foil the ants, the larva plucks some of the waxy wool from nearby aphids and sticks it on its own back. Thus disguised, the larva continues to consume aphids without the ants being the wiser. (The aphids know of course.) Artificially denuded larva are immediately spotted by ants and ejected from the colony. Cases are known where animals protect themselves from predators by covering themselves with vegetable matter and other debris, but the lacewing larva is unusual in that it mimics its prey by stealing the prey's own clothing. (Eisner, Thomas, et al; "Wolf-in-Sheep'sClothing Strategy of a Predaceous Insect Larva," Science, 199:790, 1978.) Comment. Does evolution satisfactorily explain the existence of such a trait as this? From Science Frontiers #3 , April 1978 . 1978-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 115: Jan-Feb 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Strangely Selective Spider Australia's funnel web spider is one of the world's deadliest. Before an antivenin became available, this species killed one human every four years. It is not this low death rate that impels us to mention this spider. It is because the bite of the funnel web is deadly only to insects and humans. All other mammals are said to be immune. Analysis of the venom yields the remarkable fact that it consists of 45 active compounds. One of these is specific to insect brain cells; another, to human nerve cells. (da Silva, Wilson; "Spider Gives Kiss of Death to Pests," New Scientist, p. 23, May 17, 1997.) Comment. Since humans are not on the funnel web's menu, it must be only a coincidence that its venom kills people so selectively. It would be nice to know if chimps, gorillas, and orangs really are immune. A related phenomenon is seen in the venoms of cone shells. These snails are much more dangerous to humans, particularly naive shell collectors. Their venoms are extraordinarily complex and contain hundreds, perhaps thousands, of toxins. Many of these are specific to potential prey. Once again, humans are not on the menu but are included anyway. (Concar, David; "Doctor Snail," New Scientist, p. 26, October 19, 1996.) Comment. ...
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... Science Frontiers ONLINE No. 116: Mar-Apr 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Monarch Compasses Field experiments down the years suggest that migrating birds use a variety of strategies to chart their courses with high precision. The geomagnetic field, the sun, the stars, prominent landmarks, and even odors help guide them across the continents and open seas. But birds are considered highly evolved animals so their sophisticated navigational techniques are not especially surprising. Monarch butterflies, however, are mere insects, with tiny brains (navigation-data processors) and not much in the way of the environment sensors and internal clocks required for long-distance migration. Yet, some of these colorful insects manage to flutter up to 4,000 kilometers from the eastern U.S . and Canada to their wintering grounds in Mexico. How do they do this? S.M . Perez et al have now shown that monarch butterflies are equipped with a sun compass; that is, they chart their courses by noting the sun's changing azimuth. This feat requires not only the measurement of solar azimuth but also reference to an internal clock. Humans cannot do this without artificial instruments. Furthermore, even on cloudy days, migrating monarchs fly in the proper direction (generally south-southwest). Apparently, they also have evolved a backup navigation system, perhaps a geomagnetic compass. (Perez, Sandra M., et al' "A Sun Compass in Monarch Butterflies," Nature, 387:29, 1997.) Comment ...
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... coral reefs off the coast of Belize, they hear a an underwater sound like frying bacon. This sound emanates from the snapping claws of Synalpheus regalis , popularly called snapping shrimp. These diminutive crustaceans live in colonies in the channels of sponges. The individual shrimp in these sponge-sheltered colonies are not all alike. The noise-makers are the "soldier" caste, which wield big "fighting claws." The "workers" that care for the young lack the large claws. All of the young shrimp are produced by a single "queen" shrimp, who is substantially larger than the soldiers and workers. The snapping shrimp social order sounds a lot like that found in bee hives and termite mounds. The snapping shrimp are, in fact, "eusocial" like the social insects. They are the only known eusocial members of the Order Crustacea . Eusociality is considered to be at the apex of animal social organization. What forces have fostered its development in three diverse groups -- insects, mammals (the naked mole-rats), and now the crustaceans? How did the different castes evolve, especially the sterile castes? It must have taken a lot of random mutations to develop such greatly different body forms in a coordinated way such that colonies were continuously viable! Obviously, we have a lot to learn about these snapping shrimp. Are new colonies formed when sexual forms disperse, as with ants and termites; or are there "dispersive morphs" created, as with the naked mole-rats? (See SF#106) (Duffy, J. ...
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... Science Frontiers ONLINE No. 119: Sep-Oct 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The black death and ccr5-delta 32 Plagues are not all bad, and the Black Death (bubonic plague) that swept into Europe from Asia in 1346 was no exception. It is now common knowledge that bacteria, insects, plants, and even humans can build up resistances to poisons, diseases, and antibiotics. Mutations are always occurring; some good, some neutral, some bad. It has been found that a human mutation designated CCR5-delta 32 confers immunity to AIDS if inherited from both parents. People carrying the CCR5-delta 32 mutation lack the receptors to which the AIDS virus must attach itself if it is to infect the person. What has all this to do with the Black Death? "Although the origin of the mutation is obscure, it appears to have suddenly become relatively common among white Europeans about 700 years ago. That increase suggests that something must have occurred about that time to greatly favor the survival of people carrying the mutation." What biological catastrophe decimated Europe 700 years ago? The Black Death. One-quarter to one-third of the Europeans succumbed between 1347 and 1350. The Black Death strongly modified the European gene pool, increasing the frequency of CCR5-delta 32. This mutation may not have had any direct effect on the plague itself. It may just be a quirk of fate that the survivors of the Black Death had a higher frequency of the CCR5-delta ...
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... Science Frontiers ONLINE No. 115: Jan-Feb 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Genes vs. memes Vital to the concept of "gene wars" (mentioned in SF#114) is the assumption that our destiny is controlled by "selfish genes" (or "selfish DNA"). The idea that evolution works only at the gene level has been championed by R. Dawkins, and today it dominates much evolution philosophy. However, this "genetic imperialism" is now being challenged by some scientists who insist that culture also affects an organism's evolution, be it a human or an insect. In fact, it was Dawkins himself who first proposed the term "meme" for the cultural counterpart of the gene. A meme, in other words, is an "element" of culture that can be passed along to progeny by imitation and/or cultural pressures. In reductionist thinking, environmental challenges are met by gene mutations plus natural selection. In meme theory, the same challenges are confronted by cultural changes (meme "mutation") plus natural selection. The meme approach is holistic rather than reductionist and is appealing because it allows us some control over our destiny. There are several phenomena in which some scientists profess to see memes overpowering the genes: Generations of female infanticide have led to more male births than female births. In dairy-farming societies, 90% of the population has the enzyme lactase that allows individuals to digest cows' milk. In other societies, 80% ...
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... upon sunlight for its survival. The ecosystems clustered around the deep-sea vents and the bacteria found in deep aquifers demonstrate that the sun is not essential to life -- chemical energy does just fine. In fact, the domain of chemosynthetic life has now been extended to a Romanian cave that has apparently been almost completely sealed off from surface influences for 5.5 million years. Air does leak in through tiny cracks, and water partially fills the cave. What is most remarkable in this sunless, sealed ecosystem is its biodiversity: 48 animal species, including 33 brand-new species. The roster includes isopods, a millipede, a centipede, a water scorpion, and a leech. Of course, bacteria and fungi thrive there, too. In contrast to unsealed caves, where insects, bats, and other sources of food filter in from the surface, life in the Romanian cave seems to derive entirely from hydrogen sulfide present in the cave's rocks. This compound is consumed by microorganisms, which are then grazed by cave occupants higher up the food chain. A NASA scientist has called Movile cave a "Mars analog site." And indeed it might be, for Mars has plenty of rocks and subsurface water. (Skinrud, E.; "Romanian Cave Contains Novel Ecosystem," Science News, 149: 405, 1996) Comments. Fluid-filled cracks and pores extend miles down below the earth's surface. It would be surprising if novel ecosystems do not exist there, too. The ice-sealed Antarctic lakes (see next item ...
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... plants do not "see," but the pigments provide environmental information. Here's the mechanism: plant leaves reflect infrared light well, so when a tomato plant's pigments detect a lot of infrared, the plant "thinks" that it may be crowded out by competing vegetation. The tomato plant responds aggressively by growing more rapidly. The red plastic mulch between the rows also reflects a lot of infrared light, and it thereby tricks the tomato plant into accelerating its growth. (Raloff, Janet; "When Tomatoes See Red," Science News, 152:376, 1997.) Fire-detecting beetles. The beetle Melanophila acuminata seeks out forests that have just been ravaged by fires so that it can lay its eggs in the nutritious, freshly burnt wood. These insects are capable of detecting fires up to 32 kilometers (20 miles) distant. They do not see the fire with their eyes but instead detect the thermal (infrared) radiation with a special organ on their chests. (Schmitz, Helmut, et al; "Infrared Detection in a Beetle," Nature, 386:773, 1997.) Knees "see". Well, sort of, and then only the backs of the knees. Human circadian clocks can be shifted by shining visible light on the skin on the backs of the knees. It is theorized that the light penetrates the skin and causes chemical changes in the blood, implying that human blood contains "chronobiological photoreceptors." (Oren, Dan A., and Terman, Michael; "Tweaking the Human Circadian ...
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