Deme Formation in a Dispersive Gall-Forming Midge
Deme formation in herbivores was originally thought to result from breeding within isolated populations that are highly adapted to their host plant (Edmunds and Alstad 1978). If some herbivore genotypes have advantages over others on particular hosts, and this variation is heritable over time, then these isolated populations, or demes, should diverge from the parent population and become reproductively isolated.
KeywordsWing Length Plant Clone Scale Insect Mountain Birch Reciprocal Transplant
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