Adjustments of ejaculation rates in response to risk of sperm competition in a fish, the bitterling (Rhodeus sericeus)

Show simple item record Candolin, Ulrika en Reynolds, John D. en 2004-11-22T10:42:29Z en 2009-06-17T14:02:27Z 2004-11-22T10:42:29Z en 2009-06-17T14:02:27Z 2002-06-28 en
dc.identifier.citation Proceedings of the Royal Society of London Series B 269 (1500): 1549-1553 en
dc.identifier.issn 0962-8452 en
dc.description.abstract Game theory models of sperm competition predict that within species, males should increase their sperm expenditure when they have one competitor, but decrease expenditure with increasing numbers of competitors. So far, there have been few tests or support for this prediction. Here, we show that males of a freshwater sh, the European bitterling, Rhodeus sericeus, do indeed adjust their ejaculation rate to the number of male competitors by rst increasing and then decreasing their ejaculation rates as the number of competitors increases. However, this occurred only under restricted conditions. Speci cally, the prediction was upheld as long as no female had deposited eggs in the live mussels that are used as spawning sites. After one or more females had spawned, males did not decrease their ejaculation rates with the number of competitors, but instead they became more aggressive. This indicates that decreased ejaculation rate and increased aggression are alternative responses to increased risk of sperm competition. en
dc.format.extent 166019 bytes en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Royal Society of London en
dc.subject alternative reproductive behaviours en
dc.subject mate guarding en
dc.subject sexual selection en
dc.subject trade-offs en
dc.subject Cyprinidae en
dc.subject Unionidae en
dc.title Adjustments of ejaculation rates in response to risk of sperm competition in a fish, the bitterling (Rhodeus sericeus) en
dc.type Article en
dc.identifier.laitoskoodi B57115 fi
dc.creator.corporateName Ekologia ja evoluutiobiologia (Bio- ja ympäristötieteiden laitos) fi
dc.creator.corporateName Ecology and Evolutionary Biology (Department of Biological and Environmental Sciences) en
dc.creator.corporateName Ekologi och evolutionsbiologi (Institutionen för bio- och miljövetenskaper) sv

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