Genital damage in the orb-web spider Argiope bruennichi (Araneae: Araneidae) increases paternity success

Stefan H. Nessler, Gabriele Uhl and Jutta M. Schneider

Behavioral Ecology, 2007, vol. 18, issue 1, 174-181

Abstract: The morphology of male genitalia often suggests functions besides sperm transfer that may have evolved under natural or sexual selection. In several species of sexually cannibalistic spiders, males damage their paired genitalia during mating, limiting them to one copulation per pedipalp. Using a triple-mating experiment, we tested if genital damage in the orb-web spider Argiope bruennichi increases male fitness either through facilitating his escape from an aggressive female or by obstructing the female's insemination ducts against future copulation attempts from other males. We found no survival advantage for males damaging their pedipalps; however, copulations into a previously used insemination duct were significantly shorter when the previous male had left parts of his genitalia inside the insemination duct. Because copulation duration determines paternity in this species, our result suggests that male genital damage in A. bruennichi is sexually selected. By breaking off parts of their intromittent organs inside a virgin female, males can reduce sperm competition and thereby increase their paternity success. Copyright 2007.

Keywords: mating plug; sexual cannibalism; sexual conflict; sexual selection; sperm competition (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (2)

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