Bitterling as models for studies of sperm competition
Identifieur interne : 001125 ( Istex/Corpus ); précédent : 001124; suivant : 001126Bitterling as models for studies of sperm competition
Auteurs : U. Candolin ; J. D. ReynoldsSource :
- Journal of Fish Biology [ 0022-1112 ] ; 2003-12.
Abstract
Game theory models of sperm competition predict that sperm expenditure should depend on the intensity of sperm competition. Specifically, there should be an increase in sperm expenditure when a male has one competitor, but a decrease with additional competitors. European bitterling, Rhodeus sericeus, are good models for testing this theory because sperm release by males is readily observable and territorial males regularly compete with variable numbers of sneakers. Females spawn in living freshwater mussels (Unionidae) and males release their sperm over the inhalent siphon both before and after egg laying. Our experiments confirmed that both territorial and sneaker males adjusted their sperm expenditure to the number of participating males, following the pattern predicted by game theory models. The pattern, however, was not always upheld: males increased their aggression level after a female had spawned and no longer adjusted their sperm expenditure to the number of sneaker males. Thus, adjusted sperm expenditure and mate guarding were two alternative responses to increased risk of sperm competition. Males adopted the tactic of sperm adjustment, when mate guarding and aggression against sneakers were costly in decreasing female willingness to spawn.
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DOI: 10.1111/j.1095-8649.2003.0216d.x
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Reynolds</name><affiliation><mods:affiliation>2Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.).</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fish Biology</title><idno type="ISSN">0022-1112</idno><idno type="eISSN">1095-8649</idno><imprint><publisher>Blackwell Science Ltd/Inc</publisher><pubPlace>Oxford, UK; Malden, USA</pubPlace><date type="published" when="2003-12">2003-12</date><biblScope unit="volume">63</biblScope><biblScope unit="supplement">s1</biblScope><biblScope unit="page" from="227">227</biblScope><biblScope unit="page" to="227">227</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">87013E7A9E4028190C35BA1BD8E12C10CAC0CADC</idno><idno type="DOI">10.1111/j.1095-8649.2003.0216d.x</idno><idno type="ArticleID">JFB216D</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Game theory models of sperm competition predict that sperm expenditure should depend on the intensity of sperm competition. Specifically, there should be an increase in sperm expenditure when a male has one competitor, but a decrease with additional competitors. European bitterling, Rhodeus sericeus, are good models for testing this theory because sperm release by males is readily observable and territorial males regularly compete with variable numbers of sneakers. Females spawn in living freshwater mussels (Unionidae) and males release their sperm over the inhalent siphon both before and after egg laying. Our experiments confirmed that both territorial and sneaker males adjusted their sperm expenditure to the number of participating males, following the pattern predicted by game theory models. The pattern, however, was not always upheld: males increased their aggression level after a female had spawned and no longer adjusted their sperm expenditure to the number of sneaker males. Thus, adjusted sperm expenditure and mate guarding were two alternative responses to increased risk of sperm competition. 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D.</givenNames><familyName>Reynolds</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a14" countryCode="FI"><unparsedAffiliation>(<sup>1</sup>Department of Ecology & Systematics, University of Helsinki, PO Box 65, FIN‐00014 Helsinki, Finland;</unparsedAffiliation></affiliation><affiliation xml:id="a15"><unparsedAffiliation><sup>2</sup>Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.).</unparsedAffiliation></affiliation></affiliationGroup><abstractGroup><abstract type="main" xml:lang="en"><p>Game theory models of sperm competition predict that sperm expenditure should depend on the intensity of sperm competition. Specifically, there should be an increase in sperm expenditure when a male has one competitor, but a decrease with additional competitors. European bitterling, <i>Rhodeus sericeus</i>, are good models for testing this theory because sperm release by males is readily observable and territorial males regularly compete with variable numbers of sneakers. Females spawn in living freshwater mussels (Unionidae) and males release their sperm over the inhalent siphon both before and after egg laying. Our experiments confirmed that both territorial and sneaker males adjusted their sperm expenditure to the number of participating males, following the pattern predicted by game theory models. The pattern, however, was not always upheld: males increased their aggression level after a female had spawned and no longer adjusted their sperm expenditure to the number of sneaker males. Thus, adjusted sperm expenditure and mate guarding were two alternative responses to increased risk of sperm competition. Males adopted the tactic of sperm adjustment, when mate guarding and aggression against sneakers were costly in decreasing female willingness to spawn.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Bitterling as models for studies of sperm competition</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Paper Abstracts</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Bitterling as models for studies of sperm competition</title></titleInfo><name type="personal"><namePart type="given">U.</namePart><namePart type="family">Candolin</namePart><affiliation>(1Department of Ecology & Systematics, University of Helsinki, PO Box 65, FIN‐00014 Helsinki, Finland;</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J. D.</namePart><namePart type="family">Reynolds</namePart><affiliation>2Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.).</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="abstract" displayLabel="abstract"></genre><originInfo><publisher>Blackwell Science Ltd/Inc</publisher><place><placeTerm type="text">Oxford, UK; Malden, USA</placeTerm></place><dateIssued encoding="w3cdtf">2003-12</dateIssued><copyrightDate encoding="w3cdtf">2003</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Game theory models of sperm competition predict that sperm expenditure should depend on the intensity of sperm competition. Specifically, there should be an increase in sperm expenditure when a male has one competitor, but a decrease with additional competitors. European bitterling, Rhodeus sericeus, are good models for testing this theory because sperm release by males is readily observable and territorial males regularly compete with variable numbers of sneakers. Females spawn in living freshwater mussels (Unionidae) and males release their sperm over the inhalent siphon both before and after egg laying. Our experiments confirmed that both territorial and sneaker males adjusted their sperm expenditure to the number of participating males, following the pattern predicted by game theory models. The pattern, however, was not always upheld: males increased their aggression level after a female had spawned and no longer adjusted their sperm expenditure to the number of sneaker males. Thus, adjusted sperm expenditure and mate guarding were two alternative responses to increased risk of sperm competition. Males adopted the tactic of sperm adjustment, when mate guarding and aggression against sneakers were costly in decreasing female willingness to spawn.</abstract><relatedItem type="host"><titleInfo><title>Journal of Fish Biology</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0022-1112</identifier><identifier type="eISSN">1095-8649</identifier><identifier type="DOI">10.1111/(ISSN)1095-8649</identifier><identifier type="PublisherID">JFB</identifier><part><date>2003</date><detail type="volume"><caption>vol.</caption><number>63</number></detail><detail type="supplement"><caption>Suppl. no.</caption><number>s1</number></detail><extent unit="pages"><start>227</start><end>227</end><total>1</total></extent></part></relatedItem><identifier type="istex">87013E7A9E4028190C35BA1BD8E12C10CAC0CADC</identifier><identifier type="DOI">10.1111/j.1095-8649.2003.0216d.x</identifier><identifier type="ArticleID">JFB216D</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Science Ltd/Inc</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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