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Influence of Prey Abundance on Size‐Selective Predation by Bluegills
Author(s) -
Bartell Steven M.
Publication year - 1982
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1982)111<453:iopaos>2.0.co;2
Subject(s) - predation , daphnia , abundance (ecology) , biology , bosmina , zooplankton , daphnia galeata , lepomis macrochirus , range (aeronautics) , predator , ecology , branchiopoda , fishery , cladocera , fish <actinopterygii> , materials science , composite material
Bluegills Lepomis macrochirus in Lake Wingra consume zooplankton in a size‐selective fashion. Length‐frequency distributions of ingested and available prey demonstrated that bluegills feed on a smaller range of ever larger Daphnia galeata and Bosmina longirostris as these prey species increased in abundance. The same was not apparent for Cyclops bicuspidatus as prey. Regression of intensity‐of‐selection indices for Daphnia and Bosmina versus their combined abundance suggests that these prey species are not differentiated by bluegills in Lake Wingra.