Mating changes a male contestant from a loser to a winner in male–male competition in a wolf spider

Abstract

Abstract Mating may change a male’s behaviour by increasing its motivation to engage in a contest, and enabling it to win in subsequent male–male contests. To test this hypothesis, we recorded male contests in the wolf spider, Venonia coruscans (Araneae: Lycosidae), testing a male’s motivation to fight under three different resource value conditions. First, we staged contests between two males in two different resource value conditions, on an egg-produced female’s web and then on a virgin female’s web, to test a male’s fighting ability. After determining each male’s fighting ability, we allowed each loser that lost its contests under both resource value conditions to mate with a virgin female and then introduced the previous contest winner to the web where the loser had mated. We found that without mating, the losers always lost their contests, regardless of the resource value conditions. However, once they had mated, the losers fiercely attacked the previous winners, and most won the contests back. Our study therefore provides evidence that a male’s motivation to fight can be changed under certain circumstances (e.g. mating) and can greatly influence contest outcomes in male–male competition in a mating context.