Journal
ECOLOGY LETTERS
Volume 17, Issue 1, Pages 36-43Publisher
WILEY
DOI: 10.1111/ele.12201
Keywords
Brown trout; DOC; light; limiting factors; production; Salmo trutta
Categories
Funding
- Norwegian Research Council [NFR 221410/E40, ES508934]
- strategic institute programme on ecological effects of climate change of the Norwegian Institute for Nature Research
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Here, we demonstrate a contrasting effect of terrestrial coloured dissolved organic material on the secondary production of boreal nutrient poor lakes. Using fish yield from standardised brown trout gill-net catches as a proxy, we show a unimodal response of lake secondary productivity to dissolved organic carbon (DOC). This suggests a trade-off between positive and negative effects, where the initial increase may hinge upon several factors such as energy subsidising, screening of UV-radiation or P and N load being associated with organic carbon. The subsequent decline in production with further increase in DOC is likely associated with light limitations of primary production. We also show that shallow lakes switch from positive to negative effects at higher carbon loads than deeper lakes. These results underpin the major role of organic carbon for structuring productivity of boreal lake ecosystems.
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