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Abrupt rise in the contribution of CH₄-derived carbon to benthic secondary production of a shallow hemiboreal/boreal lake

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dc.contributor.authorBelle, Simon
dc.contributor.authorTõnno, Ilmar
dc.contributor.authorStivrins, Normunds
dc.contributor.authorFreiberg, Rene
dc.contributor.authorVeski, Siim
dc.contributor.departmentCentre for Limnology. Institute of Agricultural and Environmental Sciences. Estonian University of Life Scienceseng
dc.date.accessioned2022-10-28T06:50:22Z
dc.date.available2022-10-28T06:50:22Z
dc.date.issued2018
dc.description.abstractUnderstanding long-term carbon flows through aquatic food webs is essential to assess impact of climatic and environmental changes on lake ecosystems. We reconstructed temporal changes in carbon sources fuelling chironomid biomass in a small and shallow hemiboreal/boreal lake over the last 11 000 years. Results were compared with temporal dynamics of known potential controlling factors: summer air temperature, human activities, phytoplankton assemblages and organic matter composition. We report an abrupt rise in the contribution of methane-derived carbon to chironomid biomass. However, this sudden increase was not the consequence of drastic changes in the composition of sedimentary organic matter, mean air temperature, lake trophic state or human activities in the catchment area. Our results suggest that shallowing of the lake caused by sedimentary infilling processes was a possible driver of the expansion of anoxic zones, enhancing CH 4 cycling in lake sediments. However, complementary studies are needed to better understand the mechanisms by which lake shallowing could affect carbon flows to aquatic consumers, and then better assess the natural dynamics of past carbon processing in the benthic food web of shallow lakes.eng
dc.description.abstractFinancial support was provided by institutional research grant IUT21-2, IUT1-8 from the Estonian Science Agency and by Estonian University of Life Sciences, project No. 8M160101PKLJ, and ‘Estophilus Grant’ from the Ministry of Culture of Estonia. We are grateful to Christian Hossann (INRA, Nancy, Champenoux) for assistance with the stable isotope analysis of carbon. The PTEF facility is supported by the French National Research Agency through the Laboratory of Excellence ARBRE (ANR-11-LABX-0002-01).eng
dc.description.sponsorshipFinancial support was provided by institutional research grant IUT21-2, IUT1-8 from the Estonian Science Agency and by Estonian University of Life Sciences, project No. 8M160101PKLJ, and ‘Estophilus Grant’ from the Ministry of Culture of Estonia. We are grateful to Christian Hossann (INRA, Nancy, Champenoux) for assistance with the stable isotope analysis of carbon. The PTEF facility is supported by the French National Research Agency through the Laboratory of Excellence ARBRE (ANR-11-LABX-0002-01).eng
dc.identifier.issn0267-8179
dc.identifier.publicationJ. Quaternary Sci., Vol. 33(8) 969–976 (2018)eng
dc.identifier.urihttp://hdl.handle.net/10492/7801
dc.identifier.urihttps://doi.org/10.1002/jqs.3075
dc.publisherWiley
dc.rights© 2018 John Wiley & Sons, Ltd.
dc.subjectbenthic food webeng
dc.subjectcarbon stable isotopeeng
dc.subjectHoloceneeng
dc.subjectmethane-derived carboneng
dc.subjectsubfossil chironomideng
dc.subjectarticleseng
dc.titleAbrupt rise in the contribution of CH₄-derived carbon to benthic secondary production of a shallow hemiboreal/boreal lakeeng
dc.typeArticleeng

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