A polymorphism maintained by opposite patterns of parasitism and predation


Although polymorphism is a widespread phenomenon that hasbeen recognized for nearly two centuries, the basic mechanisms maintaining most polymorphisms in nature are unknown,. We present evidence that a polymorphism can be maintained exclusively by balanced selection from two predatory species. For fieldand laboratory experiments, we used the pea aphid… (More)
DOI: 10.1038/40849


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