Males and females share a genome and express many shared phenotypic traits, which are often selected in opposite directions. This generates intralocus sexual conflict that may constrain trait evolution by preventing the sexes from reaching their optimal phenotype. Furthermore, if present across multiple loci, intralocus sexual conflict can result in a… (More)
Rapid and divergent evolution of male genital morphology is a conspicuous and general pattern across internally fertilizing animals. Rapid genital evolution is thought to be the result of sexual selection, and the role of natural selection in genital evolution remains controversial. However, natural and sexual selection are believed to act antagonistically… (More)
Investigating the ecology of leaf-litter dwelling insects is very difficult without destructive sampling of their habitat. Here, we describe the use of a metal-detector technique to study the overwintering survival of the case-bearing, leaf-litter dwelling larvae of Cryptocephalus coryli (Coleoptera: Chrysomelidae). Three-hundred and thirty captive-reared… (More)
Selfish genetic elements (SGEs) that spread by manipulating spermatogenesis often have highly deleterious effects on males that carry them. Females that mate with male carriers of SGEs can also suffer significant costs: they receive fewer and poorer-quality sperm, their offspring will inherit the deleterious allele, and the sex ratio of their offspring will… (More)
The rapid, divergent evolution of genitalia is a general trend in animals and likely influenced by sexual selection. Contrary to previous ideas, an intriguing new study suggests that sexual selection by sexual conflict can promote the evolution of both male and female genitalia.
Sperm from Drosophila simulans that carry a sex-ratio distorter is preferentially lost from females' sperm-storage organs. This suggests that sperm dumping is a major factor affecting sperm competition in this species, and may have evolved in response to sex-ratio distorters.
It is now generally recognized that it is necessary to examine how sexual selection operates across the lifespan of a male, in order to understand the total sexual selection in action. However, less attention has been paid to the fact that selection pressures can change in response to varying environmental conditions. Here, we examine male allocation to… (More)