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Publisher
Springer, Boston, MA
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Authors: Jeffrey L Feder Stewart H Berlocher Susan B Opp
Publish Date: 1998
Volume: , Issue: , Pages: 408-441
Abstract
The question of why there are so many host plantspecific phytophagous insects has long perplexed entomologists ecologists and evolutionary biologists alike In this chapter we will argue that part of the answer resides in the relationship between hostplant specialization and reproductive isolation Plants either different parts varieties or species represent different niches to phytophagous insects Traits adapting an insect to one species or variety of plant may prevent an insect from efficiently utilizing alternative hosts Do such hostassociated traits also result in reproductive isolation Walsh 1864 Thorpe 1930 Bush 1966 Futuyma and Keese 1992 Can isolation evolve as an inadvertent pleiotropic byproduct of a phytophagous insect adapting to a new host plant Rice 1987 Berlocher 1989 Rice and Hostert 1993 If so then the plethora of host specialists is due at least in part to numerous plant niches that have imposed divergent selection pressures on phytophagous insects Hutchinson 1968 Rosenzweig 1978Sympatric speciation is like the Lernaean Hydra which grew two new heads whenever one of its old heads was cut off There is only one way in which final agreement can be reached and that is to clarify the whole relevant complex of questions to such an extent that disagreement is no longer possible
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