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Stable isotope analysis of benthic fauna and their food sources in boreal lakes
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. ARCUM. (Climate Impacts Research Centre (CIRC))ORCID iD: 0000-0002-4949-9792
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2010 (English)In: Journal of the North American Benthological Society, Vol. 29, no 4, 1339-1348 p.Article in journal (Refereed) Published
Abstract [en]

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 (13)C compared to littoral zoobenthos, and this difference increased with decreasing DOC concentration. The delta(13)C of littoral zoobenthos suggested reliance on benthic algae, whereas depleted (13)C 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(13)C 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.

Place, publisher, year, edition, pages
2010. Vol. 29, no 4, 1339-1348 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-130865OAI: oai:DiVA.org:umu-130865DiVA: diva2:1070157
Note

676EBTimes Cited:2Cited References Count:54676EBTimes Cited:0Cited References Count:54

Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2017-01-31

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http://www.jnabs.org/doi/abs/10.1899/10-002.1

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Gudasz, Cristian
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