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Morphological variation between lake‐ and stream‐dwelling rock bass and pumpkinseed populations
Author(s) -
Brinsmead J.,
Fox M. G.
Publication year - 2002
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2002.tb02502.x
Subject(s) - lepomis , biology , peduncle (anatomy) , streams , centrarchidae , stream power , bass (fish) , fish fin , perciformes , fin , watershed , fishery , ecology , fish <actinopterygii> , micropterus , sediment , computer network , paleontology , materials science , machine learning , computer science , composite material , botany
Pumpkinseed Lepomis gibbosus and rock bass Ambloplites rupestris stream populations of both sexes were significantly different in external morphology from lake populations in a central Ontario, Canada, watershed. The predictions that stream fishes would be more slender‐bodied, and have a more anterior placement of lateral fins than lake fishes were generally supported. The prediction that stream fishes would have a more robust caudal peduncle was partially supported. The prediction that fin size would be larger in stream fishes was not supported, as lake rock bass generally had longer and wider fins than those from stream sites. The results suggest that in some species, smaller fins may be favoured in stream‐dwelling individuals because the reduction of drag during swimming more than compensates for their reduced power and propulsion efficiency in a current. Smaller fin size in stream‐dwelling centrarchids may be related to their body shape, or to their low usage of fast‐moving water within the streams they inhabit.