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Stable isotope anal...
Stable isotope analysis of benthic fauna and their food sources in boreal lakes
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- Premke, Katrin (author)
- Uppsala universitet,Limnologi
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- Karlsson, Jan, 1969- (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Steger, Kristin (author)
- Uppsala universitet,Limnologi
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- Gudasz, Cristian (author)
- Uppsala universitet,Limnologi,Limnology, Department of Ecology and Evolution, EBC, Uppsala University, Norbyva¨gen 18 D, 75 236 Uppsala, Sweden
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- von Wachenfeldt, Eddie (author)
- Uppsala universitet,Limnologi
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- Tranvik, Lars J. (author)
- Uppsala universitet,Limnologi
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(creator_code:org_t)
- University of Chicago Press, 2010
- 2010
- English.
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In: Journal of The North American Benthological Society. - : University of Chicago Press. - 0887-3593 .- 1937-237X. ; 29:4, s. 1339-1348
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The origin of organic C supporting zoobenthic communities in 8 boreal lakes with different concentrations of dissolved organic C (DOC) was assessed by stable-isotope analysis. Profundal zoobenthos was depleted in C-13 compared to littoral zoobenthos, and this difference increased with decreasing DOC concentration. The delta C-13 of littoral zoobenthos suggested reliance on benthic algae, whereas depleted C-13 of profundal zoobenthos could be explained by contributions from allochthonous and autochthonous C sources. In deeper lakes, profundal zoobenthos diets also included C processed by methanotrophic bacteria. Littoral zoobenthos delta C-13 decreased with increasing DOC concentration in the lake water. Our results suggest that littoral benthic fauna are mainly supported by benthic algae in low-DOC lakes and by phytoplankton and allochthonous organic C in high-DOC lakes and that this difference is a result of light absorbance and energy supply by allochthonous organic C. Increasing allochthonous DOC inputs, as expected in a warmer and wetter climate, might reduce benthic algal production and alter the organic C base for benthic food webs in lake ecosystems.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- autochthonous
- allochthonous
- dissolved organic C
- stable isotopes
- boreal lakes
- Freshwater ecology
- Limnisk ekologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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