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Sexual size dimorphism in anadromous brown trout Salmo trutta
Author(s) -
Jonsson B.,
Jonsson N.
Publication year - 2015
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/jfb.12704
Subject(s) - salmo , biology , brown trout , sexual dimorphism , fish migration , zoology , fishery , salmonidae , fish <actinopterygii>
Anadromous trout Salmo trutta exhibits sexual size dimorphism ( S SD ); females were larger than males in populations where male mean total length ( L T ) at maturity was below 49 cm and females were smaller than males when mean male L T was above 49 cm, the slope of the regression of female on male L T was 0·59. In streams with mean annual discharge below 41 m 3 s −1 , flow added significantly to a model with S SD as the dependent variable and male mean L T at maturity as the first predictor variable. There was a slight increase in S SD with increasing latitude, which may result from an increase in male size with increasing latitude.