Male size,mating potential and lifetime reproductive success in the field cricket,Gryllus bimaculatus (De Geer) |
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| Institution: | 1. Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima City, Tokushima, Japan;2. Division of Evolutionary Developmental Biology, National Institute for Basic Biology, Okazaki, Aichi, Japan;3. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States;4. Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA, United States;5. Howard Hughes Medical Institute, Chevy Chase, MD, United States;6. Laboratory of Bioinformatics and Genome Biology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland |
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| Abstract: | Male size is known to influence short-term, competitive mating success in the field cricket, Gryllus bimaculatus. Short-term measures of mating success are, however, potentially misleading when considering the influence of sexual selection on male morphology and behaviour. The lifetime mating success of males was investigated in the absence of competition to determine the effects of male size per se on reproductive potential and any effects of female behaviour on male lifetime mating success. The cost of spermatophore production was relatively greater for small males who consequently had a longer refractory period between matings, thus limiting their reproductive potential. Large males had a mating advantage resulting from a differential response of females to the courtship attempts of large and small males. Furthermore, small males were ‘sexually incompetent’ in terms of their ability to attach spermatophores once mounted. There was, therefore, an overall positive relationship between male size and lifetime reproductive success. |
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