Speciational Trends and the Role of Species in Macroevolution

@article{Futuyma1989SpeciationalTA,
  title={Speciational Trends and the Role of Species in Macroevolution},
  author={Douglas J. Futuyma},
  journal={The American Naturalist},
  year={1989},
  volume={134},
  pages={318 - 321}
}
  • D. Futuyma
  • Published 1 August 1989
  • Biology
  • The American Naturalist
Professor Grant (1989) argued that in my recent note on the role of species in anagenesis (Futuyma 1987), I have independently discovered his principle of "speciational trends," and he noted the failure of younger authors to cite precedents in the older literature for their ideas. Although I strongly advocate a historical perspective on one's field and attempt to live up to this ideal, I must admit to overlooking some points of similarity between Grant's ideas and my own, although I was… 
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It is proposed that because the spatial locations of habitats shift in time, extinction of and interbreeding among local populations makes much of the geographic differentiation of populations ephemeral, whereas reproductive isolation confers efficient permanence on morphological changes for them to be discerned in the fossil record, a consequence of speciation that supports a highly qualified version of punctuated equilibrium is pointed out.
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The subject of speciational trends is reviewed here for several reasons, since it can explain some macroevolutionary phenomena that are difficult o account for by any other process.
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