LEVELS OF FEMALE CHOICE IN THE WHITE-TAILED SKIMMER PLATHEMIS LYDIA (ODONATA: LIBELLULIDAE) by WALTER D. KOENIG1) (Hastings Reservation and Museum of Vertebrate Zoology, University of California, Carmel Valley 93924, U.S.A.) (With 6 Figures) (Acc. 17-IX-1991) Introduction Sexual selection acts via two mechanisms: mate choice and intrasexual competition for mates (DARWIN, 1871). In order for sexual selection to act, there must be variance in fitness among individuals acting on a char- acter that confers an advantage in reproduction over other individuals of the same sex (DARWIN, 1871; ARNOLD, 1983; CLUTTOrr-BROCx, 1983; KOENIG & ALBANO, 1986). Although considerable work has been devoted to studying mate choice and competition for mates in a variety of species, there is as yet no basis from which to generalize the conditions under which one of these two mechanisms is likely to be more important than the other (BRADBURY & DAVIES, 1986). Indeed, because male-male com- petition may favor the same individuals chosen by females and because males of many species can force females to mate, the processes of male- male competition and female choice are often difficult to separate (HALLIDAY, 1983). Odonates (dragonflies and damselflies) exhibit several peculiarities that make it possible to focus
Behaviour – Brill
Published: Jan 1, 1991
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