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Seasonal movement, growth and survival of brook trout in sympatry with brown trout in M idwestern US streams
Author(s) -
Hoxmeier R. John H.,
Dieterman Douglas J.
Publication year - 2013
Publication title -
ecology of freshwater fish
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 55
eISSN - 1600-0633
pISSN - 0906-6691
DOI - 10.1111/eff.12051
Subject(s) - brown trout , trout , salmo , salvelinus , fontinalis , streams , biology , sympatry , abundance (ecology) , interspecific competition , ecology , fishery , sympatric speciation , fish <actinopterygii> , computer network , computer science
Abstract Seasonal patterns in growth, survival and movement of brook trout S alvelinus fontinalis were monitored in two southeastern M innesota streams divided into study reaches based on brown trout S almo trutta abundance. We estimated survival and movement while testing for effects of stream reach and time using a multistrata C ormack– J olly– S eber model in P rogram MARK . Multistrata models were analysed for three age groups (age‐0, age‐1 and age‐2+) to estimate apparent survival, capture probability and movement. Survival varied by time period, but not brown trout abundance and was lower during flood events. Age‐0 brook trout emigrated from reaches with low brown trout abundance, whereas adult brook trout emigrated from downstream brown trout‐dominated reaches. Growth was highest in spring and summer and did not differ across streams or reaches for the youngest age classes. For age‐2+ brook trout, however, growth was lower in reaches where brown trout were abundant. Interspecific interactions can be age or size dependent; our results show evidence for adult interactions, but not for age‐0. Our results suggest that brook trout can be limited by both environmental and brown trout interactions that can vary by season and life stage.