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From autochthonous to allochthonous resources: seasonal shifts in food use by stream‐dwelling YOY Arctic charr Salvelinus alpinus through the ice‐free season
Author(s) -
SánchezHernández J.,
Gabler H.M.,
Amundsen P.A.
Publication year - 2016
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.12817
Subject(s) - salvelinus , biology , arctic , chironomidae , ecology , invertebrate , abundance (ecology) , fishery , larva , fish <actinopterygii> , trout
Substantial seasonal changes in resource use associated with enhanced water‐column use were revealed in stream‐living YOY Arctic charr Salvelinus alpinus during the ice‐free season. In July, YOY individuals showed a diet dominated by aquatic invertebrates (mainly Chironomidae larvae), but despite the small size of the fish, the abundance of terrestrial insects in their diet increased markedly from July to September (from 1·9 to 62·8%). Similarly, the frequency of surface drifting foragers, i.e. individuals feeding on allochthonous resources, increased from July to September (from 20·6 to 80%); allochthonous resources thus constituting an important energy subsidy for YOY S. alpinus during the late sub‐Arctic summer.