Abstract:
:Seasonal and ontogenetic shifts in the diet of Arctic charr Salvelinus alpinus were studied in a deep, ultra-oligotrophic lake in subarctic Finland from both stomach contents and the stable carbon (delta(13)C) and nitrogen (delta(15)N) isotope compositions of muscle and liver tissues. Both diet and isotope results indicated that the S. alpinus population relied mainly on littoral benthic energy sources. The strong littoral reliance appeared largely independent of season or fish size, although the data lacked small (total length, L(T), <130 mm) and young (<3 years) S. alpinus. Liver isotope values of intermediate-sized S. alpinus (200-350 mm), however, suggested exploitation of the increase in the abundance of pelagic zooplankton in the late open-water season. The results suggest that, in general, a strong littoral reliance of fishes can be a feature in subarctic lakes throughout the year. Due to its faster isotopic turnover rate and thus higher resolution for temporal diet changes, liver could be more commonly used in stable-isotope studies of fish trophic niche shifts instead of using only the less responsive muscle tissue.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Eloranta AP,Kahilainen KK,Jones RIdoi
10.1111/j.1095-8649.2010.02656.xsubject
Has Abstractpub_date
2010-07-01 00:00:00pages
80-97issue
1eissn
0022-1112issn
1095-8649pii
JFB2656journal_volume
77pub_type
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