Sexual selection arises from social interactions, and if social environments vary so too should sexual selection. For example, male-male competition often occurs either in the presence or in the absence of females, and such changes in the social environment could affect the form and strength of sexual selection. Here we examine how the presence of a female influences selection arising from male...

Field surveys conducted in Argentina proved Plectonycha correntina Lacordaire (Coleoptera: Chrysomelidae) to be a promising biocontrol agent against the Neotropical perennial climber, Anredera cordifolia (Tenore) Steenis (Basellaceae), a serious environmental weed in Africa and Australasia. Larvae and adults feed on the leaves. The host range was evaluated by no-choice larval survival tests and...