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2002 The Society for the Study of Evolution. All rights reserved. Evolution, 56(1), 2002, pp. 111120
 

Summary: 111
2002 The Society for the Study of Evolution. All rights reserved.
Evolution, 56(1), 2002, pp. 111­120
PATTERNS OF DIVERGENCE IN THE EFFECTS OF MATING ON FEMALE
REPRODUCTIVE PERFORMANCE IN FLOUR BEETLES
TINA NILSSON,1,2 CLAUDIA FRICKE,3 AND GO¨ RAN ARNQVIST3
1Animal Ecology, Department of Ecology and Environmental Science, Umea° University, SE-901 87 Umea°, Sweden
2E-mail: Tina.Nilsson@eg.umu.se
3Department of Animal Ecology, Evolutionary Biology Centre, Uppsala University, Norbyva¨gen 18D, SE-752 36 Uppsala, Sweden
Abstract. Sexual selection can lead to rapid divergence in reproductive characters. Recent studies have indicated that
postmating events, such as sperm precedence, may play a key role in speciation. Here, we stress that other components
of postmating sexual selection may be involved in the evolution of reproductive isolation. One of these is the repro-
ductive investment made by females after mating (i.e., differential allocation). We performed an experiment designed
to assess genetic divergence in the effects of mating on female reproductive performance in flour beetles, Tribolium
castaneum. Females were mated to males of three different wild-type genotypes at two different frequencies, in all
possible reciprocal combinations. Male genotype affected all aspects of female reproduction, through its effects on
female longevity, total offspring production, reproductive rate, mating rate, and fertility. Moreover, male and female
genotype interacted in their effects on offspring production and reproductive rate. We use the pattern of these inter-
actions to discuss the evolutionary process of divergence and suggest that the pattern is most consistent with that
expected if divergence was driven by sexually antagonistic coevolution. In particular, the fact that females exhibited

  

Source: Arnqvist, Göran - Department of Animal Ecology, Uppsala Universitet

 

Collections: Environmental Sciences and Ecology