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Correlated evolution between male and female primary reproductive characters in seed beetles

Summary: Correlated evolution between male and female primary
reproductive characters in seed beetles
Johanna Liljestrand Ro¨nn*, Mari Katvala and Go¨ran Arnqvist
Department of Ecology and Evolution, Evolutionary Biology Centre, Animal Ecology, University of Uppsala, Norbyva¨gen
18D, SE-752 36 Uppsala, Sweden
1. Because males and females of internally inseminating species interact directly during mating,
adaptations in one sex in primary reproductive traits may trigger an evolutionary response in the
other sex. Divergent postcopulatory sexual selection is considered the main driving force behind
the evolution of many male and female reproductive traits, generating unique morphologies and
physiologies that can contribute to reproductive isolation and, ultimately, speciation.
2. The focus of most previous studies of the evolution of primary reproductive characters has
been male reproductive traits and ejaculate or sperm characteristics. However, in order to more
fully understand the evolution of primary reproductive characters it is crucial that we also
include female traits.
3. In insects, both the size and the composition of the ejaculate have been shown to influence
female reproduction in numerous ways by affecting female remating behaviour, female fecundity
and female life span. Here, we employ a phylogenetic comparative approach to assess correlated
evolution between primary reproductive characters in males and those in females in a group of
seed beetles (Chrysomelidae: Bruchinae). We further explore correlated evolution between ejacu-


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


Collections: Environmental Sciences and Ecology