Abstract
Sexual selection may operate on pre-copulatory, copulatory, and post-copulatory traits. An example of a copulatory target of sexual selection is the genitalic movements a male performs during copulation. These movements may function either to prevent sperm competition or to influence a female’s fertilization decision. Here we investigated how copulation duration, pedipalp movements, and abdominal movements that males of the pholcid spider Holocnemus pluchei produce during copulation influence sperm removal and/or patterns of successful sperm transfer. We compared mating events with virgin and mated females for differences in copulatory and post-copulatory behavior. We expected longer copulation duration, longer pedipalp movement duration, and more complex and frequent pedipalp and abdominal movements when males mated with mated females compared to virgin females. Except for abdominal movements, our results corroborated these predictions. Furthermore, when we investigated mating events with mated females, we observed sperm mass ejection from the female gonopore and physical removal of sperm by males’ procursi. Females with interrupted second mating events showed a significant reduction of stored sperm masses compared to females with completed mating events. We suggest that males use alternating pedipalp movements to remove most of the rival sperm stored by mated females prior to sperm transfer. Copulation duration and pedipalp movements can be further used to transfer sperm and/or as a form of genitalic copulatory courtship.
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Acknowledgments
We thank Margarita Chiaraviglio and Cristina Sciocia for suggestions on the manuscript. The authors also acknowledge D. Vrech and P. Olivero for help during collecting and rearing. Financial support was provided by the Consejo Nacional de Investigaciones Científicas y Técnicas, FONCYT, and Secretaria de ciencia y técnica–Universidad Nacional de Córdoba of Argentina and Agencia Nacional de Investigación, España. Four reviewers and Chris Anderson provided highly useful comments to previous versions.
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Communicated by: Sven Thatje
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Male carrying out alternating pedipalp movements, overview (MPG 3214 kb)
Male carrying out alternating pedipalp movements, detailed view (MPG 1720 kb)
Male carrying out simultaneous pedipalp movements (MPG 4272 kb)
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Calbacho-Rosa, L., Galicia-Mendoza, I., Dutto, M.S. et al. Copulatory behavior in a pholcid spider: males use specialized genitalic movements for sperm removal and copulatory courtship. Naturwissenschaften 100, 407–416 (2013). https://doi.org/10.1007/s00114-013-1038-1
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DOI: https://doi.org/10.1007/s00114-013-1038-1