Morphological variation of perch Perca fluviatilis in humic lakes: the effect of predator density, competition and prey abundance
Identifieur interne : 000444 ( Main/Exploration ); précédent : 000443; suivant : 000445Morphological variation of perch Perca fluviatilis in humic lakes: the effect of predator density, competition and prey abundance
Auteurs : J. Kek L Inen [Finlande] ; J. K Hkönen [Finlande] ; V. Kiviniemi [Finlande] ; H. Huuskonen [Finlande]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2010-03.
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Abstract
Between and within‐lake variations in morphology of perch Perca fluviatilis were studied in four humic lakes in eastern Finland. Perca fluviatilis were more streamlined and smaller headed in a lake with the highest abundance of cyprinids, but lowest abundance of predators (Lake Tuopanjärvi), indicating adaptation to planktivorous feeding and low predator density. Highest bodied fish were found from a lake with the lowest cyprinid but highest predator abundance (Lake Koppelojärvi), which conversely indicates adaptation to more effective predator avoidance. Furthermore, the length of the paired fins was longest in Lake Kinnasjärvi and Lake Tuopanjärvi, where the abundance of benthic macroinvertebrates was lowest, suggesting selection for more effective benthivory. Clear morphological differences of P. fluviatilis between habitats were found only in Lake Kinnasjärvi, whereas in Lake Koppelojärvi and Lake Tuopanjärvi only the length of the paired fins differed and in Lake Harkkojärvi no differences were found. Taken together, these results suggest that inter and intrapopulation morphological differences are probably highly dependent on different biotic factors (i.e. predation risk, resource availability and competition). Spatial and temporal variations in these factors may have a great effect on body morphology of P. fluviatilis.
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DOI: 10.1111/j.1095-8649.2009.02475.x
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Box 111, FI‐80101 Joensuu</wicri:regionArea><wicri:noRegion>FI‐80101 Joensuu</wicri:noRegion></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 Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-03">2010-03</date><biblScope unit="volume">76</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="787">787</biblScope><biblScope unit="page" to="799">799</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">E7510048846225665A34C63D07D238100E8A13FD</idno><idno type="DOI">10.1111/j.1095-8649.2009.02475.x</idno><idno type="ArticleID">JFB2475</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>morphology</term><term>population</term><term>predation</term><term>resource availability</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Between and within‐lake variations in morphology of perch Perca fluviatilis were studied in four humic lakes in eastern Finland. Perca fluviatilis were more streamlined and smaller headed in a lake with the highest abundance of cyprinids, but lowest abundance of predators (Lake Tuopanjärvi), indicating adaptation to planktivorous feeding and low predator density. Highest bodied fish were found from a lake with the lowest cyprinid but highest predator abundance (Lake Koppelojärvi), which conversely indicates adaptation to more effective predator avoidance. Furthermore, the length of the paired fins was longest in Lake Kinnasjärvi and Lake Tuopanjärvi, where the abundance of benthic macroinvertebrates was lowest, suggesting selection for more effective benthivory. Clear morphological differences of P. fluviatilis between habitats were found only in Lake Kinnasjärvi, whereas in Lake Koppelojärvi and Lake Tuopanjärvi only the length of the paired fins differed and in Lake Harkkojärvi no differences were found. Taken together, these results suggest that inter and intrapopulation morphological differences are probably highly dependent on different biotic factors (i.e. predation risk, resource availability and competition). Spatial and temporal variations in these factors may have a great effect on body morphology of P. fluviatilis.</div></front></TEI><affiliations><list><country><li>Finlande</li></country><region><li>Finlande-Centrale</li></region><settlement><li>Jyväskylä</li></settlement><orgName><li>Université de Jyväskylä</li></orgName></list><tree><country name="Finlande"><noRegion><name sortKey="Kek L Inen, J" sort="Kek L Inen, J" uniqKey="Kek L Inen J" first="J." last="Kek L Inen">J. Kek L Inen</name></noRegion><name sortKey="Huuskonen, H" sort="Huuskonen, H" uniqKey="Huuskonen H" first="H." last="Huuskonen">H. Huuskonen</name><name sortKey="K Hkonen, J" sort="K Hkonen, J" uniqKey="K Hkonen J" first="J." last="K Hkönen">J. K Hkönen</name><name sortKey="Kek L Inen, J" sort="Kek L Inen, J" uniqKey="Kek L Inen J" first="J." last="Kek L Inen">J. Kek L Inen</name><name sortKey="Kiviniemi, V" sort="Kiviniemi, V" uniqKey="Kiviniemi V" first="V." last="Kiviniemi">V. Kiviniemi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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