From autochthonous to allochthonous resources: seasonal shifts in food use by stream‐dwelling YOY Arctic charr Salvelinus alpinusthrough the ice‐free season

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 th...

Full description

Bibliographic Details
Published in:Journal of Fish Biology
Main Authors: Sánchez‐Hernández, J., Gabler, H.‐M., Amundsen, P.‐A.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2015
Subjects:
Arctic
Arctic charr
Salvelinus alpinus
Online Access:http://dx.doi.org/10.1111/jfb.12817
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfb.12817
https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfb.12817
Description
Summary: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.

Similar Items