K. D. Bennett's Evolution and Ecology: The Pace of Life PDF

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 proof, provided during this e-book, exhibits that evolutionary methods noticeable in ecological time can't be used to foretell macroevolutionary tendencies, opposite to Darwin's unique thesis. the writer discusses how climatic oscillations on ice-age timescales are paced by means of diversifications within the Earth's orbit, and feature hence been an everlasting characteristic of Earth heritage. there's, even if, little proof for macroevolutionary switch according to those climatic alterations, suggesting that over geological time, macroevolution doesn't take place because of amassed brief time period tactics. those conclusions are used to build a postmodern evolutionary synthesis within which evolution and ecology play an equivalent function. Written via a number one paleoecologist, this booklet can be of curiosity to researchers in either ecology and evolutionary biology.

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426-427). The 'turnover-pulse' hypothesis represents a strong form of environmental control of evolution, also emphasized by Haffer (1990). 34 • Development of ideas 'Modern synthesis9 versus 'punctuated equilibria9 Much of the comment on punctuated equilibria has been centred around demonstrating that neither Darwin nor any of the modern synthesis authors ever said that they thought that evolution took place by continuous gradual change over long periods of time. Dawkins (1986) and Levinton (1988) devoted several pages to showing that rates of evolution vary over time, can be sufficiently rapid as to appear instantaneous in the fossil record, and that no-one ever denied that this was the case.

Thus considered, it is not a special theory, which can be verified or falsified, but a general theory, a paradigm, which can absorb changes and modifications within wide limits, and has done so over the years since its inception (Grant 1985, pp. 16—17). The final criticism which can be directed at the punctuated equilibria model is its emphasis on the founder event model of speciation. Because Mayr's original Ecological processes • 35 model attracts little favour from geneticists, it is a shaky basis on which to build a general theory of evolutionary change (Cockburn 1991, pp.

It might, by this process, take between 1 and 10 million years for a subspecific advance in the Equidae without natural selection. However, one lineage had evolved through nine genera in 45 million years, so some other process must be at work, and he argued that that process must be natural selection (Simpson 1944, p. 81). 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.

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

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