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Article Dans Une Revue Scientific Reports Année : 2019

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

Simon Belle
Jenny Nilsson
  • Fonction : Auteur
Ilmar Tõnno
  • Fonction : Auteur
Rene Freiberg
  • Fonction : Auteur
Tobias Vrede
  • Fonction : Auteur
Willem Goedkoop
  • Fonction : Auteur

Résumé

Abstract 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.
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Dates et versions

hal-03485481 , version 1 (28-06-2024)

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Simon Belle, Jenny Nilsson, Ilmar Tõnno, Rene Freiberg, Tobias Vrede, et al.. Climate-induced changes in carbon flows across the plant-consumer interface in a small subarctic lake. Scientific Reports, 2019, 9 (1), ⟨10.1038/s41598-019-53541-3⟩. ⟨hal-03485481⟩
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