Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake

Reconstructions of past food web dynamics are necessary for better understanding long-term impacts of climate change on subarctic lakes. We studied elemental and stable isotopic composition of sedimentary organic matter, photosynthetic pigments and carbon stable isotopic composition of Daphnia (Clad...

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Bibliographic Details
Published in:Scientific reports 2019-11, Vol.9 (1), p.17087, Article 17087
Main Authors: Belle, Simon, Nilsson, Jenny L., Tõnno, Ilmar, Freiberg, Rene, Vrede, Tobias, Goedkoop, Willem
Format: Article
Language:English
Subjects:
631/158/2449
631/158/2462
704/286
Algae
Animals
Biomass
Carbon
Carbon - metabolism
Carbon Isotopes - analysis
Climate Change
Daphnia
Daphnia - physiology
Eggs
Environmental impact
Environmental Sciences
Food webs
Humanities and Social Sciences
Lakes
Lakes - chemistry
multidisciplinary
Oceanografi, hydrologi, vattenresurser
Oceanography, Hydrology, Water Resources
Organic matter
Ovum - physiology
Photosynthetic pigments
Pigments
Plankton
Primary production
Science
Science (multidisciplinary)
Zooplankton
Zooplankton - physiology
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Summary:Reconstructions of past food web dynamics are necessary for better understanding long-term impacts of climate change on subarctic lakes. We studied elemental and stable isotopic composition of sedimentary organic matter, photosynthetic pigments and carbon stable isotopic composition of Daphnia (Cladocera; Crustacea) resting eggs (δ 13 C Clado ) in a sediment record from a small subarctic lake. We examined how regional climate and landscape changes over the last 5800 years affected the relative importance of allochthonous and autochthonous carbon transfer to zooplankton. Overall, δ 13 C Clado values were well in line with the range of theoretical values of aquatic primary producers, confirming that zooplankton consumers in subarctic lakes, even in the long-term perspective, are mainly fuelled by autochthonous primary production. Results also revealed greater incorporations of benthic algae into zooplankton biomass in periods that had a warmer and drier climate and clearer water, whereas a colder and wetter climate and lower water transparency induced higher contributions of planktonic algae to Daphnia biomass. This study thus emphasizes long-term influence of terrestrial-aquatic linkages and in-lake processes on the functioning of subarctic lake food webs.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-53541-3