The influence of body size and prior residency on the outcome of male-male interactions ofMarpissa marina, a New Zealand jumping spider (Araneae Salticidae)

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Abstract
In experiments, body size and prior residency at nests are shown to be factors that influence the outcome of male-male aggressive interactions of Marpissa marina, a New Zealand jumping spider. Away from nests, larger males tend to win, but at nests the occupant tends to win. Possible reasons for M. marina male-male conflict being settled by these rules are discussed. The larger question of why salticid males are aggressive is also discussed.