The costs of mating and egg production in Callosobruchus seed beetles
2006 (English)In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 72, no 2, 335-342 p.Article in journal (Refereed) Published
The net cost of reproduction, as well as the trade-off between reproduction and lifespan, is affected by many male and female adaptations. Because several of these are sexually selected, we expect the cost of reproduction to be affected by sexual selection. For example, traits favoured in males by sexual selection may cause elevated costs of mating for females. We conducted a series of experiments where we independently varied female exposure to males and access to oviposition substrates in six congeneric seed beetle species (Callosobruchus spp.). These experiments allowed us to partition the cost of reproduction for females into the cost of mating and the cost of egg production. The results show that there is dramatic variation across species in the costs and benefits of a single mating in terms of effects on female lifespan. In some species, females lived for longer after mating once while others showed a net cost of mating expressed as a reduction in lifespan. Lifelong cohabitation with males resulted in a shortened lifespan for females of all species but the extent to which cohabitation reduced female lifespan varied across species. We also found partial support for a depressed lifetime egg production as a result of cohabitation with males. Collectively, our results reveal a remarkable variation across species in the costs and benefits of mating within this clade of closely related and ecologically uniform species. We conclude that key traits, which influence the economics of sexual interactions and reproduction, have evolved rapidly in this model system.
Place, publisher, year, edition, pages
2006. Vol. 72, no 2, 335-342 p.
Callosobruchus, economics of mating, reproduction
IdentifiersURN: urn:nbn:se:uu:diva-98606DOI: 10.1016/j.anbehav.2005.10.024ISI: 000240217300009OAI: oai:DiVA.org:uu-98606DiVA: diva2:189117