Renée Claire Firman

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Individuals of many species copulate with multiple mates (polygamy). Multiple mating by females (polyandry) promotes sperm competition, which has broad implications for the evolution of the ejaculate. Multigenerational studies of polygamous insects have shown that the removal of sexual selection has profound fitness consequences for females, and can lead to(More)
Male genitalia exhibit a taxonomically widespread pattern of rapid and divergent evolution. Sexual selection is generally believed to be responsible for these patterns of evolutionary divergence, although empirical support for the sexual selection hypothesis comes mainly from studies of insects. Here we show that sexual selection is responsible for an(More)
Sperm production is physiologically costly. Consequently, males are expected to be prudent in their sperm production, and tailor their expenditure according to prevailing social conditions. Differences in sperm production have been found across island populations of house mice that differ in the level of selection from sperm competition. Here, we determined(More)
BACKGROUND When females mate with multiple partners, sperm from rival males compete to fertilize the ova. Studies of experimental evolution have proven the selective action of sperm competition on male reproductive traits. However, while reproductive traits may evolve in response to sperm competition, this does not necessarily provide evidence that sperm(More)
Sperm morphology varies considerably both between and within species. The sperm of many muroid rodents bear an apical hook at the proximal end of the head. The curvature of the sperm hook varies greatly across species, however the adaptive significance of the sperm hook is currently not known. In wood mice the apical hooks intertwine to form sperm 'trains',(More)
Sperm conjugation occurs when two or more sperm physically unite for motility or transport through the female reproductive tract. In many muroid rodent species, sperm conjugates have been shown to form by a single, conspicuous apical hook located on the sperm head. These sperm "trains" have been reported to be highly variable in size and, despite all the(More)
Although mating is costly, multiple mating by females is a taxonomically widespread phenomenon. Theory has suggested that polyandry may allow females to gain genetic benefits for their offspring, and thus offset the costs associated with this mating strategy. For example, the good sperm hypothesis posits that females benefit from mating multiply when(More)
Sperm show a remarkable degree of variation in size, shape and complexity. Murine rodents exhibit a sperm head morphology that differs greatly from the ovoid shape that is characteristic of most mammals. These rodents have sperm that bear one or more apical hooks, the function of which is currently surrounded by much controversy. It has been suggested that(More)
Keywords: ejaculate allocation experimental evolution house mouse intensity mating duration Mus domesticus paternity success risk sperm competition Sperm competition imposes strong selection on males to gain fertilizations and maximize paternity. Males have been shown to adapt to sperm competition by modifying their behaviour and/or reproductive physiology.(More)
Multiple mating is a common reproductive strategy among mammals, and rodents living in communal, mixed sex social groups are predisposed to a polygamous existence. The sandy inland mouse is a naturally polyandrous species that occurs across most of Australia’s arid region. Females typically have greater reproductive restrictions compared with males and are(More)