27 results found.
... Science Frontiers ONLINE No. 8: Fall 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Convergent evolution or chance look-alikes Why should caddis fly larvae and a species of aquatic snail look alike? Mimicry is rather common in nature for it often confers some sort of advantage to one or both of the species in the turmoil of evolutionary pressures. Or so the theory goes. Most examples of convergent evolution involve closely related species. In the present case, though, the species are in different phyla. The caddis fly larva builds its snail-like shell by cementing grains of sand together with a silk-like secretion, while the snail's shell is a calcareous excretion. One would expect a strong advantage to be conferred on one or the other species, especially in the matter of predation. Using brook trout as predators, how ever, proved perplexing, for the trout would eat only the snails, avoiding the carbon-copy larvae. (Berger, Joel, and Kaster, Jerry; "Convergent Evolution between Phyla...." Evolution, 33:511, 1979.) Comment. This is a remarkable case of mimicry. One wonders how the caddisfly larvae know exactly what snails look like, and how the unique shell constructing methods were coded into its genes by evolution. Or did the snail emulate the larvae? From Science Frontiers #8 , Fall 1979 . 1979-2000 William R. Corliss ...
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... of Offspring BBA4 Vividly Colored and Highly Patterned Avian Plumages and Ornaments BBA5 Plumage Polymorphism BBA6 Females with Male Plumage BBA7 Molting before Hatching BBA8 Unusual Diversification and Conservation in Plumage BBA9 Complexity and Sophistication of Feathers BBA10 Complexity and Sophistication of Feather Color-and-Pattern-Generation Mechanisms BBA11 Unusual Plumage-Color Changes BBA12 Feather Curiosities BBA13 Neoteny in Feathers BBA14 Tooth Substitutes in Modern Birds BBA15 Birds Lacking Egg Teeth BBA16 Extreme Sexual Dimorphism in Bills BBA17 Bill Polymorphisms BBA18 Avian Bills: Unusual Adaptations 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 " ...
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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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... . This gigantic terrestrial easel covers 400 square miles. Upon it are drawn more than 1,000 biomorphs and geoglyphs, plus some 800 straight lines. It is one of the world's great archeological legacies from the deep past. Actually, at least two canvasses seem to be superimposed. The earliest canvas consists of the geoglyphs, which were incised beginning about 200 B.C . Peel away these, and we are left with the geometrical figures and straight lines. These seem to have been inscribed starting about 600 A.D . -- a time of severe drought, which may be a clue to their purpose. Next, strip off the geoglyphs (trapezoids and such), and a seeming mishmash of straight lines survives. But most are not random when analyzed. Most converge spoke-like upon 62 or more "ray centers." Thus, the Nazca Plain seems to be a 3-page book: biomorphs, geoglyphs, and spoked ray-centers. They all overlap. It's all a gigantic Rorschach test; and different observers see different things! A Nazca biomorph (monkey with spiral tail) overlain by an abstract, unexplained geoglyph. See Book Supplement for still another Nazca figure. Of course, there are doodles on this 400-square-mile canvas that don't fit on any of the three pages. We'll have to ignore them for now. The archeoastronomers first tried to read something meaningful into the Nazca lines, but they were disappointed. Computer analyses revealed no significant connections with the rising and settings of heavenly ...
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... 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, through small random mutations, just the right sort of ear to tune in on the crickets? From Science Frontiers #86, MAR-APR 1993 . 1993-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 20: Mar-Apr 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Heads or tails?Fake-head butterflies often escape predators that make passes at their cleverly designed tails, which as the figure shows, look awfully like butterfly heads, with eye spot, fake antennas, etc. Further, the converging stripes direct attention to the false head. The result is that this type of butterfly may lose its tail but save its real head. This effective stripe pattern has evolved (? ) independently at least six times in the Neotropics. (Robbins, Robert K.; "The 'False Head' Hypothesis: Predation and Wing Pattern Variation of Lycaenid Butterflies," American Naturalist, 118:770, 1981.) Comment. One wonders why all butterflies haven't evolved this neat ploy? From Science Frontiers #20, MAR-APR 1982 . 1982-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 57: May-Jun 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Mysterious Bird Deaths "An eight-year study by Indian zoologists has failed to establish why birds commit suicide year after year at the small village of Jatinga in the northeastern state of Assam. "Attracted by the lights, birds converge on Jatinga at night and on landing become immobile, stop feeding and starve. They neither resist capture nor try to fly away." The mysterious phenomenon dates back to 1905. It peaks in September and October, as the monsoon season wanes, with as many as 500 birds, from some 36 species, dying each night. The birds alight at the same spot each year -- a one-kilometer stretch in the town. No one can account for the selection of this precise spot or for the dazed condition of the birds. (Jayaraman, K.S .; "Mystery of Bird Deaths in Assam," Nature, 331:556, 1988.) From Science Frontiers #57, MAY-JUN 1988 . 1988-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 31: Jan-Feb 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The hypothesis of formative causation lives!Rupert Sheldrake's hypothesis has been roundly condemned by many scientists, presumably because it departs so radically from current thinking. Basically, the hypothesis maintains that the forms of things (from crystals to life forms) and the behavior of organisms is influenced by "morphic resonance emanating from past events." Convergent evolution, wherein human eyes closely resemble squid eyes, might well be explained by the hypothesis. Sheldrake has been testing his idea in various ways. One experiment involves the accompanying illustration containing a hidden image. Once the solution of this illustration is learned, it is hard to forget, but few people see the answer right off. The hypothesis of formative causation insists that once one or more persons learn the drawing's secret, the easier it will be for others to see the solution. Actual tests consisted of broadcasting the illustration and its solution (that is, the hidden image) on English television combined with before-and-after checks elsewhere in the world outside TV range. The results strongly supported the hypothesis, for it was far easier for people outside England to identify the hidden images after the broadcast. (Sheldrake, Rupert; "Formative Causation: The Hypothesis Supported," New Scientist, 100:279, 1983.) Comment. With all this prior publicity, the hidden image should pop immediately into the reader's mind. But if it doesn' ...
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... Science Frontiers ONLINE No. 8: Fall 1979 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Enigmatic Stone Forts of the American Midwest Libyan Signs From Southeastern Kentucky Astronomy Are the Sun's Fires Going Out? An Oasis on Mars -- No Palm Trees But... Due to A Fortunate Coincidence You Can Read About A Fortunate Coincidence Rings of Uranus: Invisible and Impossible? Biology Convergent Evolution Or Chance Look-alikes The Importance of Nonsense Geology Coral Carbon Ratios Confound Chronometry Old Tektites in Young Sediments? Iridium and Mass Extinctions Geophysics Brontides Become Respectable Chicken-plucking by Tornados Psychology Deathbed Experiences Laid to Rest ...
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... Science Frontiers ONLINE No. 101: Sep-Oct 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The great exodus Those who believe that the universe is populated by many technically advanced civilizations have long wondered why we earthlings have not been officially invited to join the Intergalactic Federation. Where are those extraterrestrial emissaries anyway? Unfortunately, the extraterrestrial traffic seems to be going at warp speed in the wrong direction. Instead of interstellar spaceships converging on earth full of helpful aliens, everyone (or everything) seems to be fleeing our environs. The proof positive is in all those quasars with high redshifts. In reality, they are not energetic astronomical objects but rather spaceships emitting great power fluxes in our direction from their engines. Earthbound astronomers are really viewing the aft ends of rapidly receding spacecraft. No one ever sees any blueshifted quasars that would tell us that visitors are coming to see us! We are thus truly alone in space, perhaps "deserted" is a better word. What did we do wrong? (Duncan, Dave; "What Do They Know?" New Scientist, p. 52. May 13, 1995.) From Science Frontiers #101 Sep-Oct 1995 . 1995-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 114: Nov-Dec 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Lightning Strikes Jet And Possibly Spawns Ball Lightning June 17, 1996. Tewkesbury, England. On this day, two remarkable observations were made a few seconds apart. Even so, one cannot be certain that the first caused the second. For the first observation, there were two witnesses. Both saw lightning strike a low-flying USAF jet. Mrs. E. Shobli wrote the following account: "Two forks of lightning came from the clouds in front of the plane, converged on it and gripped it. The tail end of the plane became illuminated -- vapours came from its end and formed into a bright, dense mass. I thought I was witnessing damage to the plane. The light continued to separate from the plane, downwards like a flare. It appeared as yellow, lit-up gases. These seemed to take shape, becoming brighter and denser, and then move downwards in the same direction as the plane (south). About two seconds after disappearing behind the roof there was an ear-splitting explosion. To my relief the plane reappeared unscathed." At the time of the lightning strikes, the jet was passing over a factory, where a fork-lift driver saw a dazzling blue-white ball bounce along the factory roof and enter the building. Many workers inside were treated to an amazing pyrotechnic display as the ball made its way through the building. "It entered the factory ...
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... Science Frontiers ONLINE No. 79: Jan-Feb 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Those slippery (adult) eels Every year untold millions of adult eels swim down the rivers of the continents toward the sea, where they are literally swallowed up. They are never seen again! In the Atlantic, the oft-told sci-entific tale is that all the adult eels from Europe and eastern North America converge on the Sargasso Sea. Here, they mate and die. It is in this area of the Atlantic that one finds high concentrations of eel larva, called leptocephali; and this alone is why the eels are thought to spawn here. In a long article in Science News, E. Pennisi is the latest to wonder where the adult eels are. She relates how, despite several ambitious expeditions well-armed with nets, traps, and sundry eel-catching devices, ". .. no one has ever spotted adult eels in the spawning grounds." Actually, Pennisi's article focusses on the Pacific and a 1991 Japanese expedition that searched for the spawning grounds of Anguilla Japonica , the Japanese eel. Earlier searches had been in conclusive. The 1991 attempt, after arduous labors and 16,000 kilometers of cruising, found the highest concentrations of leptocephali east of the Philippines. But, as in the Atlantic, even though many larvae were captured, no adult eels turned up in the nets. (Pennisi, Elizabeth; "Gone Eeling," Science News, 140:297, ...
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... rooms. Constructed of tightly fitting sandstone blocks, each Great House required tens of millions of cut sandstone slabs. For floors, the Anasazi carried logs from forests 80 kilometers away. The Chaco Canyon Great Houses required about 215,000 trees -- quite a problem in transportation. Strangely enough, the Great Houses seem to have been used only occasionally. In fact, Chaco Canyon was too poor agriculturally to support a large, permanent community. If this is so, what was the purpose of the Great Houses with their many kivas (large circular pits)? Obviously, they were for "ceremonial purposes" -- the standard explanation for enigmatic buildings and artifacts. The Anasazi also built a marvelous system of roads leading to Chaco Canyon. The accompanying map reveals hundreds of miles of roads converging from all directions on Chaco Canyon. For long distances, these roads measure a uniform 9 meters wide. They are flanked by linear mounds of earth and are impressively straight. The Great North Road, for example, runs true north for almost 50 kilometers. What was the purpose of these roads?. One theory is that they helped channel people to Chaco Canyon for the supposed ceremonies. But why does one need a 9-meter-wide road for a sparse population? And why did the Anasazi suddenly leave all this behind? (Lekson, Stephen H., et al; "The Chaco Canyon Community," Scientific American, 259:100, July 1988.) Some of the Anasazi roads and projected roads leading to Chaco Canyon. Nine Great Houses are located in ...
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... like the beaver -- a very, very distant relative both in distance and position on the Tree of Life. Both platypus and beaver are furry, aquatic creatures with webbed feet and a large, flat tail. We have saved the strangest part for the end! Platypusses, being Monotremes (one-enders) have a common vent for waste and reproduction. Beavers, it turns out, are among the very rare placental mammals that (like the birds) possess a cloaca -- a common vent for urine and excrement. (Hoffman, Eric; "Paradoxes of the Platypus," Scientific American, 264:18, March 1991.) Comment. The "beaver" part just mentioned was not in Hoffman's article; we added it because it underscores the ap parent convergent evolution of platypus and beaver. Reference. For many more platypus curiosities, refer to BMA25, BMA50 in our catalog Biological Anomalies: Mammals I and BMO8 in Biological Anomalies: Mammals II. Information on these books may be found here . From Science Frontiers #75, MAY-JUN 1991 . 1991-2000 William R. Corliss ...
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... primitive features, paleoanthropologist D. Erler, of the University of California, asserted, "This shows that modern features were emerging in different parts of the world." In other words, all of the evolutionary action was not confined to Africa. Proponents of the "African Eve" theory retort that the dating of the Chinese skulls is questionable and that flat faces alone are not enough to support the idea that modern humans arose separately in widely separated locales? (Gibbons, Ann; "An About-Face for Modern Human Origins," Science, 256: 1521, 1992. Also: Bower, Bruce; "Erectus Unhinged," Science News, 141:408, 1992.) Comment. Could the African and Asian fossils imply that so-called "parallel" or "convergent" evolution has occurred in the human lineage, too, just as it has in so many other forms of life? Reference. Human evolution and the African Eve hypothesis are cataloged in Chapter BHE in Biological Anomalies: Humans III . Ordering details here . From Science Frontiers #83, SEP-OCT 1992 . 1992-2000 William R. Corliss ...
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... so black, and then I directed the canoe with all this total confidence at a time when I had already convinced myself prior to the voyage that I would have no confidence in knowing where to go. And I turned the canoe to this particular direction, got things lined up, felt very, very comfortable in this cold, wet, rough environment and then there was a break in the clouds and the moon was there." (Finney, Ben; "A Role for Magnetoreception in Human Navigation," Current Anthropology, 36:500, 1995.) Ancient Pacific navigators making the voyage from Hawaii to Tahiti (in the Society Islands) dreaded crossing the doldrums near the Equator. Hawaii (not shown) is north of Tahiti at about 20 N. SPCZ=South Pacific Convergence Zone. Map from Irwin G.,; The Prehistoric Exploration and Colonisation of the Pacific. (Available from the Sourcebook Project). Reference. Human directional and "magnetic" senses are covered in: Biological Anomalies: Humans I. See description of this book here . From Science Frontiers #101 Sep-Oct 1995 . 1995-2000 William R. Corliss ...
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... that many male birds are brightly colored because females prefer flashy finery and thus put evolutionary pressure on the development of these characteristics. A large-scale study by Baker and Parker indicates that Darwin erred and that the evolutionary pressure comes instead from predators avoiding brightly colored targets. Instinct tells the predators -- incorrectly in many cases -- that colorful prey taste bad or are noxious. The remarkable (possibly strange) aspect of bird coloration is the incredi ble external similarity of unrelated birds occupying similar habitats. Example, the American Eastern Meadowlark (left) closely resembles the African Yellowthroated Longclaw (right). (Krebs, John R.; "Bird Colours," Nature, 282:14, 1979.) Comment. Two questions cannot be repressed: How do the genes orchestrate this amazing convergence in response to environmental factors? Why was evolution not equally clever in equipping predators with countermeasures to see through these ruses? From Science Frontiers #10, Spring 1980 . 1980-2000 William R. Corliss ...
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... No. 14: Winter 1981 Supplement Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Beetles Make Scents Termite nests frequently host foreign species that seem to be accepted as fellow termites. Can't termites recognize the invaders? The authors believe that termites probably recognize one another by specific hydrocarbon labels synthesized on their cuticles. If the alien species were to be somehow marked with similar chemical identifiers, the blind termites might not know the difference. Howard et al think this may be the case with a species of beetle often found integrated into termite society. By chemi-cally analyzing beetle and termite cuticles, they have found both wearing the same hydrocarbon labels. Furthermore, the beetles synthesize their own chemical masks. This is an astounding instance of parallel or convergent evolution between remotely related species. (Howard, R.W . et al, "Chemical Mimicry as an Integrating Mechanism....," Science, 210:431, 1980.) Comment. Synthesizing exactly the right hydrocarbons was certainly a great stroke of good fortune for the beetles! From Science Frontiers #14, Winter 1981 . 1981-2000 William R. Corliss ...
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... perpetually exposed to their extreme, non-negotiable positions. The Darwinists insist upon their one-gene/one-protein genome in which random mutations slowly accumulate and adapt living things to the changing environment. The Creationists only accept a one-time, supernatural creation of "kinds" plus minor adaptations (" microevolution"). J.A . Shapiro, a professor at the University of Chicago, is searching for a "third way," a scientific, non-Darwinian way. Shapiro maintains that five decades of genetic and molecular-biology research have transformed our vision of life. Ile compares the conceptual changes to those accompanying the transition from classical physics to relativity and quantum mechanics. This new theory of evolution -- his "third" way -- will emerge from the convergence of biology and information science. Genomes, asserts Shapiro, are not really the static "beads on a string" envisioned by the Darwinians. Rather, they are fluid and complex. Genes are now seen as multipurpose elements that turn on and off as required for the survival and well-being of the organism they belong to. In this paradigm-eroding paper (referenced below), Shapiro describes four categories of molecular discoveries that have revised our thinking about how evolution works: (1 ) Genome Organization; (2 ) Cellular-Repair Capabilities; (3 ) Mobile Genetic Elements and Natural Genetic Engineering; and (4 ) Cellular Information Processing. He then writes: The point of this discussion is that our current knowledge of genetic change is fundamentally at variance with neo-Darwinist ...
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... Sourcebook Project Sourcebook Subjects Archeology in britain: straying from the party line In the final 1982 issue of New Scientist, Paul Devereux and Robert Forrest relate the history of leys in England. Leys are supposedly the intentional spotting of megalithic sites along straight lines extending several kilometers. Some alignments occur through chance, but several leys seem statistically significant. The puzzle is why ancient peoples bothered to align their edifices -- assuming they really did. Most professional archeologists believe leys to be figments of the imagination of amateurs. This being so, they must be incensed by the claims made two weeks later in New Scientist. There, stimulated by the earlier report on leys, a retired engineer presented his measurements of the magnetic fields around the Rollright Stones. He maintained that he was able to magnetically detect several converging leys and, in addition, a spiral pattern inside the stone circle. A psychic accompanying him independently perceived the leys and spiral. (Devereux, Paul, and Forrest, Robert; "Straight Lines on an Ancient Landscape," New Scientist, 96:822, 1982. Also: Brooker, Charles; "Magnetism and the Standing Stones," New Scientist, 97:105, 1983.) Comment. Psychics, especially dowsers, have long maintained that megalithic sites are the foci of mysterious forces, notably spirals. This is pretty wild stuff for a respected science journal to print. The editors would be well-advised to send someone with a magnetometer down to the Rollright Stones to straighten out this matter. Magnetically located leys and spiral at the Rollright Stones, England. ...
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... Science Frontiers ONLINE No. 56: Mar-Apr 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Wandering Molluscs "How could a mollusc which lived all its adult life cemented fast to the seabed in shallow water occur thousands of kilometers apart in the Arabian Gulf and the Caribbean? Almost identical forms of the extinct bivalve Torreites sanchezi have been found in rocks from the Caribbean and the Gulf. Peter Skelton of the Open University and Paul Wright of the University of Bristol suggest that the larval stage of the bivalve must have 'island hopped.'" The two researchers rule out convergent evolution and note that the two seas were never any closer together. They suppose that in Cretaceous times there was an equatorial current that swept the larval forms long distances. (Anonymous; "Wandering Molluscs," New Scientist, p. 33, October 15, 1987.) Comment. The same situation prevails for other species, such as some of the amphipods and the unique life forms dependent on seafloor vents. From Science Frontiers #56, MAR-APR 1988 . 1988-2000 William R. Corliss ...
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... the blue part of the sun's rays (470-490 nanometers). These are the rays that penetrate to the greatest depths in the sea. This adaptation to blue light means that deepsea fish have evolved visual pigments different from those of surface fish and land animals. Visual pigments are complex chemical compounds, and one must suppose that many, many random mutations took place before deepsea fish were able to manufacture visual pigments different from their relatives living near the surface. (Or did deepsea fish come first?) But there is more to this story. Many dwellers in the black abysses generate their own light. They sport bioluminescent organs so they can be seen by others of their own species and, in addition, illuminate prey for easier capture. In another remarkable example of evolutionary convergence, these bioluminescent organs emit light spectrally matching the eye sensitivity of deepsea fish! So far, though, this story is not any more amazing that many others woven into evolution's fabric. But suppose that a deviant species of deepsea fish upset this cosy status quo by evolving visual pigment and bioluminescent organs operating in a part of the electromagnetic spectrum that other deepsea fish could not perceive. It would be as if this species had radar but the others did not! Well, three genera of dragon fish do have organs (photophores) that emit far-red light, and their eyes are correspondingly red-shifted by new visual pigments. Thus, these dragon fish can communicate with each other without being detected by other species. When hunting, they can prowl the depths with lights ...
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... fields. As the plasma cloud spreads away from the impact site, it acts like a bulldozer, compressing the lunar magnetic fields ahead of it, as it envelopes the whole moon and rushes towards the antipodal point. It drives the compressed mag netic field into the surface, permanently magnetizing the rocks at the antipodal point. Voila! Magcons. (Hood, L.L ., and Huang, Z.; "Formation of Magnetic Anomalies Antipodal to Lunar Impact Basins: Two-Dimensional Model Calculations," Journal of Geophysical Research, 96:9837, 1991.) Comment. The earth also sports scars from the impacts of large meteoroids. Are there magnetic anomalies opposite these craters? Even more interesting to check out would be the holes blasted in the earth's biosphere by the converging masses of hot gases at the an tipodal points. Wouldn't there be extinctions seen in the fossil record at these antipodal points? Reference. Magcons are cataloged as ALZ1 in The Moon and Planets. This catalog is described here . From Science Frontiers #78, NOV-DEC 1991 . 1991-2000 William R. Corliss ...
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... Like many other poisonous animals, the pitohuis also emit a foul odor and advertise their unsavory nature with bright colors. (Dumbacher, John P., et al; "Homobatrachotoxin in the Genus Pitohui : Chemical Defense in Birds?" Science, 258:799, 1992. Also: Anonymous; "Bird with a Sting in Its Tail," New Scientist, p. 10, October 31, 1992.) Comment. As we see from the diagram, homobatrachotoxin possesses a rather complex chemical structure. One wonders how the pitohuis acquired the ability to synthesize it through random mutations. The puzzle deepens when one discovers that homobatrachotoxin is also manufactured by the New World poisondart frogs. Although far-separated taxonomically, both species traveled along the same path of random mutations to achieve this evolutionary convergence. From Science Frontiers #85, JAN-FEB 1993 . 1993-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 124: Jul-Aug 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Offset Lunar Rainbow May 13, 1998. South Atlantic Ocean. Aboard the m.v . Appleby enroute from Long Beach to Port Talbot. "At 2225 UTC when a light rain shower was falling, a rainbow was seen on the starboard side roughly 2-3 cables from the vessel. It was very clear for about six minutes and was accompanied by a secondary bow after about half that time. The secondary one did not make a complete bow but seemed joined to the primary bow at its highest point, in a convergence area of deep blue, as indicated in the diagram. "The colours were very clear, with blues and purples visible in both parts. Both bows began to fade at about the same time as the moon once again passed behind another cloud." (Crofts, A.; "Lunar Rainbow," Marine Observer, 69:67, 1999.) Comments. Because moonlight is much weaker than sunlight, lunar rainbows are rather rare. Even so, they are not anomalous. It is the offset bow that is difficult-to-explain. Rainbow phenomena should be symmetrical around the line containing the light source (moon, here) and the bow itself. In GEB3 in Rare Halos, we note that no reasonable explanation exists for rainbows offset to one side. However, extra bows offset directly above the main bow can be explained as due to reflection of moonlight or sunlight off ...
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... 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). A. In the slow-moving boundary layer. B. Rearing through the boundary layer to present a high-drag cross section to the wind. From Science Frontiers #33, MAY-JUN 1984 . 1984-2000 William R. Corliss ...
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... species. Although the pairs are from the same geographical regions, it is not obvious why this astounding mimicry should occur. Here, one cannot invoke the explanation that one species gains an evolutionary advantage by mimicking an unpalatable species, as with mimics of the Monarch Butterfly. That is, there seems to be no evolutionary advantage to looking alike. (Miller, Julie Ann; BioScience, inside front cover, March 1994. Miller's editorial remarks are based upon a later article by H.F . Nijhout, who also supplied the photographs. Nijhout's article explains how butterfly wing patterns may have evolved.) Comment. Cases of remarkable mimicry also occur among geographically separated species. For example, the North American Meadowlarks are dead ringers for the African Yellow-throated Longclaw. "Convergent evolution" names the phenomenon but doesn't tell how or why long chains of random mutations can come up with the same designs where there seems to be no "guidance" by the forces of natural selection. Perhaps genomes contain "subprograms" for those patterns and structures often used in biology. Of course, Sheldrake's idea of "morphic resonance" also applies here! From Science Frontiers #95, SEP-OCT 1994 . 1994-2000 William R. Corliss ...
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