Aphid performance in an alder (Alnus) hybrid zone.

From: Ecology | Date: October 1, 1995| Author: | Copyright information

Population sizes of insect herbivores on natural plant hybrids may be higher, lower, or intermediate to those on the parent species. I studied the biology and population dynamics of a species of free-living aphid (Pterocallis alni) in a hybrid zone of alder (Alnus sp.). The parent trees were Alnus glutinosa and A. incana and their hybrid was A. pubescens. Hybrid trees differed from parents in phenological and morphological characters. Leaf trichome density on hybrid trees was intermediate to trichome densities on A. glutinosa (high density) and A. incana (low density), and thus appeared to be ...

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