26 results found.
... Science Frontiers ONLINE No. 66: Nov-Dec 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Army ants: a collective intelligence?Put a hundred army ants on a flat surface and they will walk around in never decreasing circles until they die from exhaustion. But a colony of a million army ants is a sophisticated "super-organism." The colony carries out its legendary raids and can even keep nest temperatures constant to within a degree. An army ant colony seems en dowed with an intelligence far beyond that of any individual ant. N.R .Franks speculates thus: "It seems that intelligence, natural or artificial, is an emergent property of collective communication. Human con-sciousness itself may be an epiphenomenon of extraordinary processing power. Although experts prefer to avoid simplistic definitions of intelligence, it seems clear that all intelligence involves the rational manipulation of symbolic information. This is exactly what happens when army ants pass information from individual to individual through the 'writing' and 'reading' of symbols, often in the form of chemical messengers or trail pheromones, which act as stimuli for changing behavior patterns." During its 20-day stationary phase, an army ant colony scatters about 14 foraging raids directed 123 apart. The heavy line indicates the colony's path during the nomadic phase. In the body of his article, Franks describes two remarkable capabilities of an army ant colony: time-keeping and navigation. The outward manisfestation of time-keeping is in the precise timing of the colony' ...
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... Science Frontiers ONLINE No. 76: Jul-Aug 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Ants as "excitable subunits"" Abstract. Activity levels within ant colonies are monitored by using a solid-state automatically digitizing camera. The movement-activity levels of whole colonies and of isolated groups of workers are studied. Whole colonies of Leptothorax allardycei show rhythmic changes in movement-activity level. Fourier and autocorrelation analyses indicate that the activity levels of colonies are periodic, with an average period of 26 min. Single, isolated workers do not show the pattern of periodic changes in activity level. Single workers become active spontaneously, but at no particular interval. Pairs of workers, confined together, also do not show periodicity in activity level. One worker can stimulate another worker to become active, thus coupling their movement-activity patterns. As ants are placed in larger groups, the variation in the interval between activity peaks declines in a manner predicted by coupled oscillator theory. It is argued that the colony can be regarded as a population of 'excitable subunits.," Activity records from two ant colonies. Time (horizontal axis) is measured in 30-second intervals. (Cole, Blaine J.; "Short-Term Activity Cycles in Ants: Generation of Periodicity by Worker Interaction," American Naturalist, 137:244, 1991.) Comment. The author also pointed out the "formal" or mathematical similarity of the ant movement-activity levels and the dynamics of epidemics! This makes us wonder ...
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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. 127: Jan-Feb 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Ants Like Microwaves Back in 1990, an item in SF was titled "Ants Like Amps." (SF#60/160) The subject then was the strange mesmerizing effect electrical equipment has on ants. They dote on airport runway lights, household electrical meters, and in particular electrical relays, where they congregate en masse. Now, a decade later, we discover that they are also not adverse to exploring microwave ovens -- even when they are turned on! We cannot explain the attraction of electrical relays, but we do know how ants survive in humming microwave ovens. It is because the microwaves inside the oven form standing waves. Energy is high in some areas -- ants would fry there -- and weak elsewhere. Ants seem to be able to find these lowenergy refuges and survive very nicely -- perhaps on the food you were planning to consume! (Anonymous; "Them!" New Scientist, p. 109, July 31, 1999. Comment. You can map you microwave's standing waves by filling a flat tray with marshmallows. A pattern of toasted and untoasted marshmallows will appear post-zapping. From Science Frontiers #127, JAN-FEB 2000 . 1997 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. 16: Summer 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why are there no slave ant rebellions?Some ant species regularly raid the nests of other ants and carry some of them off into slavery. An oft-discussed question is: Why don't the slaves rebel or at least try to escape back to their home nest? There seems to be no evolutionary advantage in remaining in passive slavery promoting the fortunes of the slave-makers. The opportunities to run off and rebel are never taken. It would seem that slave-ant passivity is a marked disadvantage that has slipped through evolution's net. Regardless of the reason, an imbalance exists. (Gladstone, Douglas E.; "Why There Are No Ant Slave Rebellions," American Naturalist, 117:779, 1981.) Comment. Perhaps evolution just hasn't had time to redress the situation and even now is preparing clever mutations to rescue the slave ants; i.e ., improve their fitness. From Science Frontiers #16, Summer 1981 . 1981-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 68: Mar-Apr 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Ants Like Amps Those pesky fire ants that plague man and beast alike in the southern states have a curious weakness: they dote on electrical equipment. They don't eat it; they just "like" it! Why, nobody knows. They invade a wide variety of outdoor electrical devices: airport runway lights, stoplight control boxes, household electrical meters, etc. In particular, they favor relays, where they congregate in masses, interfering with current flow and damaging circuitry. The phenomenon is made stranger by the fire ants' complete abandonment of their usual search for food and water (and ankles). They starve in droves and clog up everything. It's a mothand-candle story. Searching for the fatal attractor, researchers have already eliminated magnetic fields, vibrations, and ozone emissions. Apparently, the fire ants "see" something we can't and are smitten by it. (Weiss, Rick; "Ants Get a Transforming Charge," Science News, 136:412, 1989.) From Science Frontiers #68, MAR-APR 1990 . 1990-2000 William R. Corliss ...
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... called "grunting for worms!) Other animals also use vibrations for communication and, rather surprisingly, for cutting leaves. Malaysian tree frogs. Zoologists already knew that Puerto Rican white-lipped frogs use vibrations to communicate amongst themselves. The Malaysian tree frog can now be added to the list of substrate vibrators. The female will sit on a reed or small sapling and tap out a "come-hither" message with her toes. The message goes forth in minute seismic waves. The males detect these vibrations and proceed, sometimes in great numbers, to the source of the vibrations, and the species is thereby perpetuated. (Mestel, Rosie; "Courting Tree Frogs Make the Earth Move," New Scientist, p. 8, December 10, 1994.) Leaf-cutting ants. Leaf-cutting ants neatly excise penny-size pieces of leaves and tote them back to their fungus gardens. J. Tautz and colleagues, University of Wurtzburg, noted that the ants chirped as they sliced at the leaves with their jaws. With a little instrumentation, they discovered that during each chirp both ant and leaf vibrated at about 1,000 hertz. The vibration apparently rigidizes soft leaf tissues and makes them easier to cut. The same principle is used by biologists when they slice soft material for microscope examination. The leaf-cutting ants apparently invented the Vibratome millions of years ago. (Tautz, Jurgen, et al; "Use of a Sound-Based Vibratome by Leaf-Cutting Ants," Science, 267:84, 1995.) Comment. It ...
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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. 34: Jul-Aug 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Are parasites really the masters?All animals harbor parasites; and some parasites even have their own parasites. The usual effect of a parasite upon its host is debilitation, often to the point of death. But parasites have to reproduce, and some settle for the modification of their hosts in ways that improve their chances. Parasites can change the size, color, and even the behavior of their host. The object is usually to encourage a specific predator to eat the host so the parasite can continue its life cycle. A classic example is the lan-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 ...
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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. 74: Mar-Apr 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Echidna Eccentricities Monotremes: platypus (below); one of two species of echidnas (above) The echidna is one of the monotremes-- an egg-laying mammal. Like its relative, the platypus, it is a strange mixture of mammalian, marsupial, and reptilian characteristics. For example, echidna eggs are soft and leathery, like those of reptiles, but they are brooded in a marsupial-like pouch. The emerging baby echidna has an egg tooth like the birds and reptiles, while the adult has no teeth at all. Rather, it has a narrow snout through which it ingests ants and termites caught on its sticky tongue. In this it resembles the mammalian ant-eaters, which are also toothless but an ocean away from Australia. In fact, the echidna is often called a "spiny anteater" for it has the sharp spines of a hedgehog or porcupine. There are more anatomical peculiarities, but let us focus on the echidna's strange behavior during the mating season. At this time, 2 to 8 echidnas can be seen roaming the Australian bush in "trains" headed by a female with the smallest male acting as a caboose. When mating time arrives, the female anchors herself to a tree with her forelegs. To-gether the males dig a circular "mating rut" up to 10 inches deep around the tree. (Australians have puzzled over these circular trenches for years. ...
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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 The Moon And Life There are so many examples of lunar rhythms in terrestrial life that we tend to assume that these phenomena are understood. Obviously, evolution "created" these rhythms to further the cause of each moon-tuned organism. Palmer and Goodenough recount the classic example of the lunar synchronism of the palolo worm and add the even-more-amazing tale of P. megalops, another marine worm. Sure enough, the moon-modulated matings of these worms seem to improve reproductive efficiency. Less well known are many other moon-synchronous biological rhythms; viz., the sizes of the pits dug by ant lions to trap ants and the angles flatworms assume in swimming away from light. Many such lunar rhythms apparently have no adaptive value whatsoever. So, why do they exist? Even more disconcerting is the fact that lunar rhythms persist in the lab where the moon is not visible. Are internal clocks responsible here? If so, how do they work and how are they set? These questions are hard to answer if the rhythms have no value to the organism's success. (Palmer, John D., and Goodenough, Judith E.; "Mysterious Monthly Rhythms," Natural History, 87:64, December 1978.) Comment. It would, or course, be outright heresy to suggest that heavenly bodies may be the sources of unrecognized but biologically significant forces. Reference. Correlations of lunar phase ...
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... Science Frontiers ONLINE No. 127: Jan-Feb 2000 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The great hopewell road Paradigm quake: the solutreans were here first! A FAR-WANDERING TRIBE? Astronomy Nuclear bombs will not save the earth! Aristarchus blushes for clementine Shadow dance of the gnats What's cooking on europa? Biology Ants like microwaves Stoned dogs Some funny things happened on the way around the world Throat-singing Traitors within Geology Do continents really drift? Natural stone spheres Geophysics The strange case of angled lines in the atmosphere Black auroras Psychology Our filtered brains Mathematics Some magic squares are more magical than others ...
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... Science Frontiers ONLINE No. 16: Summer 1981 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology More Fell Fallout Astronomy Grooves of Phobos Still Unexplained A Martian Ice Age? The Moon's Magnetic Swirls Earth-moon Fission: A Slight Hint Biology Hooray, Another "dangerous" Book! Blebs and Ruffles How Do Cancers Attract A Supporting Cast Plants Manufacture Fake Insect Eggs Why Are There No Slave Ant Rebellions? Geology Paradox of the Drowned Carbonate Platforms Geophysics Earthquake Lights and Crustal Deformation Psychology Belief Systems and Health ...
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... Science Frontiers ONLINE No. 68: Mar-Apr 1990 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Michigan's prehistoric garden beds Now it's greece! Astronomy Wanted: a bona fide black hole Quiet sun: violent earth Biology Ants like amps Two-faced indians trick tigers Recent survival of the elephant in the americas Game of life favors right-handers New life for martian life Magnetic bacteria in the soil and who knows where else? Periodical invasions of aliens Geology Impact delivery of early oceans Geophysics The english hums: radar or buried pipelines? Double image of cresent moon Crop circle craze continues Psychology Higher sight Dreams that do what they're told Physics Science waits for - almost begs for - refutation General Conformity strikes again ...
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... Science Frontiers ONLINE No. 76: Jul-Aug 1991 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology An ancient egyptian ship in australia? THE MEXICAN SELLOS: POSSIBLE EVIDENCE FOR EARLY EUROPEAN CONTACTS The orogrande, nm, site Astronomy Catastrophic flooding on mars? Will earth's rings return? Biology Ants as "excitable subunits" Eight leatherback mysteries FLYING, PARACHUTING, AND FALLING FROGS Geology Baby oil UNDERGROUND CURRENT ELECTRIFIES AUSTRALIA Geophysics Atlantic's waves getting bigger Subterranean "circles" Psychology PSI EFFECTS IN THE SACRIFICE OF MARINE ALGAE Physics COLD FUSION: NEW EXPERIMENTS AND THEORIES NEW INSIGHTS AS TO THE STRUCTURE OF MATTER ...
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... Science Frontiers ONLINE No. 66: Nov-Dec 1989 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Found: the lost pyramids of rock lake DOUBTS ABOUT TWO RITUALLY RECITED THEORIES Astronomy GLOBULAR CLUSTERS UPSET THEORY OF GALAXY FORMATION Down with the big bang NEPTUNE SPINS TOO FAST AND ITS MAGNETIC FIELD IS AWRY Biology The bird that smells like cow manure Army ants: a collective intelligence? The babirusa: a quasi-ruminant pig A BAT FALL Care for a cup of viruses? Geology DRUMLINS MAY RECORD CATASTROPHIC FLOODS STRANGE BLUE POOL FOUND AT THE BOTTOM OF CRATER LAKE Biogenic minerals Geophysics Rogue waves Psychology MEMORY STRUCTURE OF AUTISTIC IDIOT SAVANTS Was burt stitched up? General Cold fusion died only in the media ...
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... Science Frontiers ONLINE No. 81: May-Jun 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Eusocial Beetles The best-known eusocial animals are the ants, termites, and naked mole rats. As As biological observations accumulate, the phenomenon is being found elsewhere in the animal kingdom. The following quotation extends eusociality to the beetles and (in case you wondered) defines "eusociality": "The weevil Austroplatypus incompertus lives in galleries in the heartwood of Eucalyptus trees. Colonies are initiated by solitary fertilized females and, when mature, manifest the three phenomena which characterize eusociality: overlapping generations, cooperative brood care and division into reproductive and sterile (unfertilized) castes. Each colony contains one fertilized and five or so unfertilized adult females, the job of the second group being to deal with predators and to extend and maintain the galleries." (Anonymous; "Sociable Beetles," Nature, 356:111, 1992.) Comment. Eusociality is somewhat of a puzzle in evolutionary theory because one must ask how the phenomenon arises, when it requires some individuals to forswear reproduction and thus give up the chance to pass their genes directly on to progeny. Explanations of such extreme altruism generally state that the nonbreeders are really helping to pass some (or even all) of their genes on by supporting the colony, for they are usually closely related to the breeding female. From Science Frontiers #81, MAY-JUN 1992 . 1992-2000 William R. Corliss ...
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... 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 It's a mole-rat, jim, but not as we know it Naked mole rats are the most social of all the mammals. They live in underground colonies with a social structure like that of ants and termites. There are castes of workers, and only the queen, an oversized female, breeds. Naked mole rats are also intensely xenophobic; they avoid or fight with other mole-rat colonies. But such tightly closed societies lead to inbreeding with all its deleterious effects. For naked mole rats to survive over the long term, a biological solution to the inbreeding problem had to be found. The response of the species to this threat is the occasional production of a "dispersive morph." The largest and most successful colonies produce -- somehow -- a larger-than-normal individual, almost always a male, that is fuelled with extra fat and possesses a yen to travel. He is disinclined to mate with the resident queen, preferring to leave the colony for amorous adventure elsewhere. Thus, intercolony gene flow is established. (Gee, Henry; "It's a Mole-Rat, Jim, But Not As We Know It," Nature, 380:584, 1996. O'Riain, M. Justin, et al; "A Dispersive Morph in the Naked Mole-Rat," Nature, 380:619, 1996) Comment. Of course, the ...
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... Science Frontiers ONLINE No. 45: May-Jun 1986 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The Lost City of Nan Madol Bubonic Plague As An Indicator of Diffusion? The Rabbit in the Moon: More Evidence of Diffusion? Astronomy The Martian Great Lakes Antarctic Meteorites Are Different Disparity Between Asteroids and Meteorites Biology The Gulper Eel and its Knotty Problem Bats May Have Invented Flight Twice (At Least!) Scant Ant Chromosomes Champ in 1985 Platypus Bill An Electrical Probe Polar Bear Coats Are Thermal Diodes Geology When Antarctica Was Green Wrong-way Primate Migration Eastern Quakes May Be Lubricated by Heavy Rainfalls The Exploding Lake Backtracking Along the Paluxy: Or is There A Deeper Mystery? Geophysics Electromagnetic Radiation From Stressed Rocks Some English Meteorological Anomalies Ozone Hole Over Antarctica Psychology Be Happy, Be Healthy: the Case for Psychoimmunology ...
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... E . has any unusual basic memory abilities; rather he employs mnemonic techniques to aid memory, and the evidence suggests that previous mnemonists who have been studied by psychologists have used very similar techniques." The "figure alphabet" employed by T.E . was used in Europe as early as the mid-1700s. The Hindus had a Sanskrit version even earlier. Basically, each digit is represented by a consonant sound or sounds: 1 2 3 4 5 6 7 8 9 0 T N M R L J K F P Z D Ng G-soft G-hard V B S Th Ch Q C-soft Sh C-hard The letters AEIOU and WHY have no numerical value and are used to build up words. Thus, 21 can be NeT, NuT, aNT, auNT, etc. The system is phonetic in that the digits are sounds rather than the letters themselves. Silent letsters do not count and double letters count as single. In one of the tests, T.E . was presented with strings of digits on a computer screen at the rate of one per second. In spite of the rapid rate of presentation, T.E . used the figure alphabet to convert digit strings into several words. Generally, he converted three digits into one two-syllable word. Twelve to 14 digits might be remembered as four or five two-syllable words. In this test, T.E . could remember more than 12 digits in the strings as they flashed by at one string per second. (Gordon, Paul, et al ...
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... SF#78) Central to this idea is the observation that the sperm of many animals, including humans, are polymorphic. They come in a variety of shapes and sizes, some of which are patently unsuited for penetrating an egg. Baker and Bellis draw upon their own studies and classifications of sperm types as well as research by R.A . Beatty and D. Ralt. They assert that sperm come in at least four varieties: "Fertilizers," the egg-penetration specialists, "Blockers," the ones that construct copulatory plugs to prevent further insemination, "Search-and destroy sperm" that hunt down as kill "enemy" sperm from other sources, "Family-planning sperm" that kill all sperm. One can liken this array of sperm types to polymorphic ant colonies with their castes of workers, soldiers, and queen. Baker and Bellis go further and suggest that the numbers of each sperm type are under the control (certainly not conscious control) of the males. For example, where promiscuity is observed, as is common in chimpanzee troops, the numbers of seek-and-destroy sperm are very high. All this out of a short review! Unfortunately, the book itself lists at $78.95, and we don't have a copy. (Sozou, Peter D.; "Mating Games," Scientific American, 274:102, January 1996) Comments. Exercising self control, we add only two comments. First, these specialized sperm cannot be as simple as those drawn in the biology books. The ...
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... 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. Emmett; "Eusociality in a Coral-Reef Shrimp," Nature, 381, 1996. Adler, T.; "A Shrimpy Find: Communal Crustaceans," Science News, 149:359, 1996) A "soldier" snapping shrimp with a huge "flighting claw". Overall length: only about half an inch. (Nature) From Science Frontiers #107, SEP-OCT 1996 . 1996-2000 William R. Corliss ...
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... 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 insect counters. What the collectors did was to fire projectiles with ropes over the high branches and then haul up canisters of a knockdown gas. Insects rained down -- a cloudburst of new species -- neatly collected on sheets spread out below. Such techniques led to the 30-million figure. As Wilson put it, "The pool of diversity is a challenge to basic science and a vast reservoir of genetic information." (Wilson, Edward O.; "The Biological Diversity Crisis," BioScience, 35:700, 1985.) Comment. Are there other "hot spots of diversity" waiting to be discovered? Probably, but they will be under our feet, in the deepest waters -- places we do not frequent or suspect. We do ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf043/sf043p10.htm
... BBA19 Wing Claws BBA20 Wing Spurs BBA21 The Alula or Bastard Wing BBA22 Some Curiosities of Avian Feet BBA23 Inherited Callosities BBA24 Unusual Pouches on Birds BBA25 Luminous Birds BBA26 Odoriferous Birds BBA27 Egg Complexity and Sophistication BBA28 Bird Eggs: Color, Pattern and Size Curiosities BBA29 Egg Mimicry BBA30 Mimicry of Other Species and the Environment BBA31 Remarkable Convergences of Appearance and Habits BBA32 Frightmolt BBA33 The Hollow in the Back of the Young Common Cuckoo BBB AVIAN BEHAVIOR BBB1 Avian Intelligence BBB2 Complexity and Sophistication of Avian Mental Processes BBB3 Enigmas of Instinct BBB4 Anomalous Altruism: Hard to Find BBB5 The Aesthetic Sense in Birds BBB6 Calculated Deception: Birds That Cry "Wolf" BBB7 Avian Play BBB8 Anomalous Aerial Tumbling and Erratic Flight BBB9 Leks: Why Did They Evolve? BBB10 Cooperative Displays on Leks BBB11 Enigmatic Dancing, Flying, Singing BBB12 Anting BBB13 "Hangers"; Upside-Down Birds BBB14 Curious Automatisms BBB15 Handedness (" Footedness") in Birds BBB16 Unusual Aerial Transportation Techniques BBB17 Unusual Forms of Terrestrial Locomotion BBB18 Unusual Hunting Strategies BBB19 Cooperative Hunting BBB20 Prey-Handling Puzzles BBB21 Avian Prey and Food: Some Misconceptions BBB22 Unusual Sexual Behavior BBB23 Avian "Sperm Wars': Cloaca Pecking BBB24 Unusual Mating Systems BBB25 Two Species with a Common Nest BBB26 Determination of Clutch Size BBB27 Exotic Objects and Eggs in Nests BBB28 Unusual Methods of Heating and Cooling Eggs BBB29 Brood Parasitism: How Did It Begin BBB30 Disparities between Parasite Host Adaptations BBB31 Tolerance of Parasite Chicks BBB32 Tolerance of Parasite Eggs Even When They Are Recognized as a Threat BBB33 Murder for Purposes Other Than Food and Brood Reduction BBB34 Infanticide BBB35 Siblicide BBB36 Information Processing in Migratory Behavior BBB37 ...
Terms matched: 1 - Score: 7 - 15 May 2017 - URL: /cat-biol.htm
