The opportunity for selection (I) is defined as the variance in relative fitness and sets the
upper limit for the intensity of selection on any given trait. For Poisson or binomial fitness …

In the laboratory, not all females of the seed bug Lygaeus simulans Deckert, 1985, produced
fertilized eggs after copulation: 26.7% of the females were not inseminated and 5% were …

Game theory models predict that individuals in contests adjust their strategy appropriately to
the current value of the contested resource and the resource holding potential (RHP) of their …

The differential costs of mating paid by males and females influence the nature and strength
of sexual selection. In butterflies, males invest a relatively large amount of time and …

There is increasing recognition that male–male competition can take many forms, but as yet
the form is not predictable a priori. Many recent studies have focused attention on how …

In the stream-dwelling isopod, Lirceus fontinalis, mating contests between males and
females occur prior to pair formation. We examined the relative contribution of male …

Understanding the evolution of female multiple mating (polyandry) is crucial for
understanding sexual selection and sexual conflict. Despite this interest, little is known about …

Aggressiveness during intersexual conflicts is predicted to depend on its costs, the value of
winning and the power asymmetry of the contestants, all of which may vary between …

The current male-costs hypothesis to explain variation in the timing of pairing in waterfowl
acknowledges that relative parental investment and intra-sexual competition among males …

Males can overcome female resistance to mating either by using luring behaviour or through
sexual coercion. We studied mating behaviour in two sexually cannibalistic camel‐spider …