| Abstract | 1. A palaeolimnological study, covering the last c. 12,000 years, was conducted in a small subalpine lake located in the Alps to study climate change impacts on carbon flows through food webs in small lakes. We used analysis of sedimentary pigments and carbon stable isotopic composition of chironomid remains (δ13CHC) to reconstruct past dynamics of phytoplankton community and carbon sources sustaining benthic consumers. 2. Chironomid biomass was sustained by a combination of allochthonous, autochthonous and CH4âEURderived organic matters, and their relative contributions were correlated to changes in temperature. Relatively high terrestrial contributions to chironomid biomass were observed during period of the Holocene when inâEURlake production was low. Relatively high incorporation of CH4âEURderived carbon to chironomid biomass was found during anoxic events coâEURoccurring with the Holocene thermal maximum. 3. Results were then compared with those collected in a small boreal lake in Estonia. We tested the hypothesis that responses in carbon flows through benthic food web to past climate change would be similar between these lakes. We found a negative correlation between δ13CHC values of both lakes and inferred air temperature, suggesting that temperature was the major driver to different food sources being incorporated into chironomid biomass. 4. Our study demonstrated that air temperature was the principal driver of the energy flows through benthic food web in the studied small lakes. We conjectured that carbon cycling in food webs of small lakes might be strongly sensitive to climate change. |
| Text | 398737 2018 10.1111/fwb.13090 Scopus 2 s2.0 85042066636 ISI Web of Science WOS 000431497700003 object Object object Object object Object object Object object Object Long term effects of climate change on carbon flows through benthic secondary production in small lakes Belle S.; Musazzi S.; Tonno I.; Poska A.; Leys B.; Lami A. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, , Sweden; CNR, Istituto per lo Studio degli Ecosistemi, Verbania Pallanza, , Italy; Centre for Limnology, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, , Estonia; Institute of Geology, Tallinn University of Technology, Tallinn, , Estonia; Department of Geography, Kansas State University, Manhattan, KS, , United States 1. A palaeolimnological study, covering the last c. 12,000 years, was conducted in a small subalpine lake located in the Alps to study climate change impacts on carbon flows through food webs in small lakes. We used analysis of sedimentary pigments and carbon stable isotopic composition of chironomid remains δ13CHC to reconstruct past dynamics of phytoplankton community and carbon sources sustaining benthic consumers. 2. Chironomid biomass was sustained by a combination of allochthonous, autochthonous and CH4aEURderived organic matters, and their relative contributions were correlated to changes in temperature. Relatively high terrestrial contributions to chironomid biomass were observed during period of the Holocene when inaEURlake production was low. Relatively high incorporation of CH4aEURderived carbon to chironomid biomass was found during anoxic events coaEURoccurring with the Holocene thermal maximum. 3. Results were then compared with those collected in a small boreal lake in Estonia. We tested the hypothesis that responses in carbon flows through benthic food web to past climate change would be similar between these lakes. We found a negative correlation between δ13CHC values of both lakes and inferred air temperature, suggesting that temperature was the major driver to different food sources being incorporated into chironomid biomass. 4. Our study demonstrated that air temperature was the principal driver of the energy flows through benthic food web in the studied small lakes. We conjectured that carbon cycling in food webs of small lakes might be strongly sensitive to climate change. 63 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 85042066636 partnerID=q2rCbXpz Articolo 2018_Freshwater_Biology_63_530_538.pdf Articolo in rivista Blackwell Scientific Publications. 0046 5070 Freshwater biology Print Freshwater biology Print Freshw. biol. Print simona.musazzi MUSAZZI SIMONA andrea.lami LAMI ANDREA |
