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1. Convergent Evolution Or Chance Look-alikes

... 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 ... 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 ...

Terms matched: 2 - Score: 168 - 15 May 2017 - URL: /sf008/sf008p07.htm

2. Science Frontiers #87, MAY-JUN 1993

... Science Frontiers ONLINE No. 87: May-Jun 1993 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The 50,000-year-old americans of pedra furada The zuni enigma The american discovery of europe! Astronomy The earth: a doubly charmed planet Cosmic soot and organic asteroids Biology Fossil feathers fly Is caddy a mammal? The uniqueness of human adolescence Animals attack human technological infrastructure Late survival of mammoths Geology Whence the earth's pulse? Giant impact-wave deposit along u.s . east coast Geophysics The vent glow and "blind" shrimp Amazons in the sky The bottle-green icebergs of antarctica Psychology Alien abuctions: were they, are they real? Calculating prodigies, gnats, and smart weapons ...

Terms matched: 2 - Score: 144 - 15 May 2017 - URL: /sf087/index.htm

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	Science Frontiers The Unusual & Unexplained Strange Science * Bizarre Biophysics * Anomalous astronomy From the pages of the World's Scientific Journals Archaeology Astronomy Biology Geology Geophysics Mathematics Psychology Physics

	About Science Frontiers Science Frontiers is the bimonthly newsletter providing digests of reports that describe scientific anomalies; that is, those observations and facts that challenge prevailing scientific paradigms. Over 2000 Science Frontiers digests have been published since 1976. These 2,000+ digests represent only the tip of the proverbial iceberg. The Sourcebook Project, which publishes Science Frontiers, also publishes the Catalog of Anomalies, which delves far more deeply into anomalistics and now extends to sixteen volumes, and covers dozens of disciplines. Over 14,000 volumes of science journals, including all issues of Nature and Science have been examined for reports on anomalies. In this context, the newsletter Science Frontiers is the appetizer and the Catalog of Anomalies is the main course. Subscriptions Subscriptions to the Science Frontiers newsletter are no longer available. Compilations of back issues can be found in Science Frontiers: The Book, and original and more detailed reports in the The Sourcebook Project series of books. The publisher Please note that the publisher has now closed, and can not be contacted.

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