Download Evolutionary Biology: Volume 21 by Lee Ehrman, Marvin Wasserman (auth.), Max K. Hecht, Bruce PDF

By Lee Ehrman, Marvin Wasserman (auth.), Max K. Hecht, Bruce Wallace, Ghillean T. Prance (eds.)

Evolutionary Biology, of which this is often the twenty-first quantity, keeps to provide its readers a variety of unique articles, reports, and com­ mentaries on evolution, within the broadest feel of that time period. the subjects of the studies variety from anthropology and behaviour to molecular biology and systematics. In contemporary volumes, a vast spectrum of articles have seemed on such matters as evolution of the bacterial genome, biochemical method­ atics in vegetation, a dialogue of species choice, and improvement and evolution of the vertebrate limb. Articles equivalent to those, frequently too lengthy for traditional journals, are the cloth for Evolutionary Biology. The editors proceed to solicit manuscripts on a global scale with a purpose to see that everybody ofthe many elements of organic evolution is roofed. Manuscripts might be despatched to an individual of the subsequent: Max ok. Hecht, division of Biology, Queens collage of town collage of recent York, Flushing, long island 11367; Bruce Wallace, division of Biology, Virginia Polytechnic Institute and kingdom collage, Blacks­ burg, Virginia 24061; or Ghillian T. Prance, big apple Botanical backyard, Bronx, ny 10458.

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Y. Kaneshiro and L. V. Giddings However, during the initial stages of colonization of a new habitat and the corresponding destabilization of the genetic environment that accompanies such colonization events, such shifts in the mating system become synergists for species formation. CONCLUDING REMARKS We are in full agreement with Ehrman and Wasserman's statement that the ability to infer direction of evolution accurately by utilizing asymmetrical sexual isolation data could be an important tool for interpreting evolutionary processes and that emphasis should be placed on accumulating more empirical data to test the various theoretical models.

Together with the geological history of the islands, the chromosomal and behavioral studies provide strong evidence for the sequence of species formation in this group of species. That there have been a number of back migrations of derived species from younger to older islands is clearly indicated by polytene chromosome data (Carson, 1983). This is in accord with conclusions based on comparative morphology and behavior and hardly constitutes evidence of flies evolving in the "wrong" direction. The Kaneshiro hypothesis has in no instance led to a conclusion that challenges the relationships established by chromosomal data (and anchored by out-group comparison) among the well-studied Hawaiian fauna, as Ehrman and Wasserman imply.

No evidence is presented to suggest that sympatric speciation has played a role in either of the two groups that Watanabe and Kawanishi studied. Thus, while these authors claim that their model is consistent with phylogenies that have been widely accepted, the Watanabe-Kawanishi model has not gained much support. " Instead, they presented a third alternative interpretation for the asymmetries they observed in D. mojavensis and D. arizonensis. They argued that character displacement (Wasserman and Koepfer, 1977) could have played a dom- 32 K.

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