Strategic ejaculate adjustments occur when males modify their investment in sperm and
nonsperm components of the ejaculate according to the context. This strategy is expected to …

Postcopulatory sexual selection (PCSS), namely sperm competition and cryptic female
choice, is typically investigated in benign environments, with a fixed number of partners …

Fifty years of research on sperm competition has led to a very good understanding of the
interspecific variation in sperm production traits. The reasons why this variation is often very …

According to the sperm competition risk (SCR) model, males should increase their
investment in ejaculates when there is a high chance that their sperm will compete for …

Life‐history theory suggests that ageing is one of the costs of reproduction. Accordingly, a
higher reproductive allocation is expected to increase the deterioration of both the somatic …

Increased expenditure on the ejaculate is a taxonomically widespread male response to
sperm competition. Increased ejaculate expenditure is assumed to come at a cost to future …

Sperm traits can influence fertilisation success, but there is still much we do not understand
about sperm condition dependence, that is, how much sperm traits depend on the male's …

Life history theory suggests that aging is one of the costs of reproduction. Accordingly, a
higher reproductive allocation is expected to increase the deterioration of both the somatic …

Most experimental tests of mating systems theory have been conducted in the laboratory,
using operational sex ratios (ratio of ready-to-mate male to ready-to-mate female) that are …

In species with fixed alternative male mating tactics, differences between male phenotypes
associated with each tactic are well understood. By contrast, in species with fully …