Download PDF by K. D. Bennett: Evolution and Ecology: The Pace of Life

By K. D. Bennett

ISBN-10: 0511608594

ISBN-13: 9780511608599

ISBN-10: 0521390281

ISBN-13: 9780521390286

ISBN-10: 0521399211

ISBN-13: 9780521399210

The mechanisms of macroevolutionary swap are a contentious factor. Paleoecological facts, provided during this ebook, exhibits that evolutionary techniques seen in ecological time can't be used to foretell macroevolutionary developments, opposite to Darwin's unique thesis. the writer discusses how climatic oscillations on ice-age timescales are paced through adaptations within the Earth's orbit, and feature therefore been an everlasting characteristic of Earth background. there's, besides the fact that, little facts for macroevolutionary switch in keeping with those climatic adjustments, suggesting that over geological time, macroevolution doesn't happen due to amassed brief time period methods. those conclusions are used to build a postmodern evolutionary synthesis within which evolution and ecology play an equivalent position. Written by means of a number one paleoecologist, this ebook should be of curiosity to researchers in either ecology and evolutionary biology.

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Ecology has never functioned as a whole, and, numerous textbooks notwithstanding, has never had a synthetic work (other than On the Origin of Species), and there have been no advances or unifying developments affecting all subdisciplines. There are, indeed, deep problems about the way ecologists go about their business, both on an academic level (Peters 1991), and by confusion with political and religious movements. One work that came nearest, single-handedly, to advancing and defining ecology was the text Animal Ecology by Elton (1927).

Since species are made up of organisms related by descent, they need not even be composed of similar organisms, although they normally will be (Hull 1976). Evolutionary processes • 31 Not everyone accepts the notion that species are individuals. But the philosophical notion that they are strikes a chord with the punctuatedequilibria interpretation of the fossil record. If Eldredge & Gould (1972) are right about that, then speciation is the all-important evolutionary process: species have 'births' and 'deaths' that are analogous with these processes for organisms.

He summarized his arguments on selection by reference to three theories that have denied crucial importance to selection: Lamarckian, vitalistic, and preadaptation theories, and rejected each in turn. Simpson (1944) argued that numerous examples showed that 'mega-evolution' normally occurred among small populations that become preadaptive and evolved continuously and rapidly to radically different ecological positions (Simpson 1944, p. 123). He noted that the splitting of populations into small groups was the genetical situation most likely to generate new forms.

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Evolution and Ecology: The Pace of Life by K. D. Bennett


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