speciation burst hypothesis an explanation for the variation in rates of phenotypic evolution物种形成破裂假说解释了表型进化的利率的变化.pdfVIP
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speciation burst hypothesis an explanation for the variation in rates of phenotypic evolution物种形成破裂假说解释了表型进化的利率的变化
Tribune libre Speciation burst hypothesis : an explanation for the variation in rates of phenotypic evolution S.C. TSAKAS* J.R. DAVID* Department*of Genetics, Agricultural College of Athens, Athenr, Greece ** C.N.R.S., Luboratoire de Biologie et Génétique évohitives, F 91190 Gif-sur-Yvette Summary Phenotypic characters show remarkable variability in evolutionary rates and at times periods of seemingly random rapid acceleration. The speciation burst hypothesis offers a supported explanation of the variability of rates as being primarily the result of the organisms exposure and sensitivity to ultraviolet light and/or cosmic rays. Any major disruption increasing the amount of exposure such as a geomagnetic reversal would also increase the evolutionary rate. An association was found between a period of frequent geomagnetic reversals and rapid speciation events observed simultaneously in 2 different categories of organisms, with different habitats, and pronounced difference in population sizes. Key words : Environmental mutagenesis, phenotypic evolution, geomagnetic reversals. Résumé L’hypothèse d’une spéciation par bouffées : une explication de la variabilité de la vitesse de l’évolution phénotypique Les caractères phénotypiques montrent une remarquable variabilité dans leur vitesse d’évolution et une accélération rapide à certains moments. L’hypothèse d’une spéciation par bouffées interprète cette variabilité comme la conséquence d’une exposition des organismes aux rayonnements ultra-violets et aux rayons cosmiques. Toute perturbation majeure, comme par exemple un renversemen
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