Contrasting responses to long-term climate change of carbon flows to benthic consumers in two different sized lakes in the Baltic area
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Kuupäev
2018
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Elsevier
Abstrakt
The study of lake sediments and archived biological remains is a promising approach to better under-
stand the impacts of climate change on aquatic ecosystems. Small lakes have been shown to be strongly
sensitive to past climate change, but similar information is lacking for large lakes. By identifying re-
sponses to climate change of carbon flows through benthic food web in two different sized lakes, we
aimed to understand how lake morphometry can mediate the effects of climate change. We recon-
structed the dynamics of phytoplankton community composition and carbon resources sustaining
chironomid biomass during the Holocene from the combined analysis of sedimentary pigment quanti-
fication and carbon stable isotopic composition of subfossil chironomid head capsules (d13
C HC) in a large
lake in the Baltic area (Estonia). Our results showed that chironomid biomass in the large lake was
mainly sustained by phytoplankton, with no significant relationship between d13
C HC values and tem-
perature fluctuations. We suggest that lake morphometry (including distance of the sampling zone to the
shoreline, and lake volume for primary producers) mediates the effects of climate change, making large
lakes less sensitive to climate change. Complementary studies are needed to better understand differ-
ences in organic matter dynamics in different sized lakes and to characterize the response of the aquatic
carbon cycle to past climate change.
Financial support was provided by institutional research grants IUT1-8 and IUT21-2 from the Estonian Science Agency and by Estonian University of Life Sciences, project No. 8M160101PKLJ. We are grateful to Christian Hossann (INRA Nancy, Champenoux) for assistance in carbon stable isotope analysis. The PTEF facility is supported by the French National Research Agency through the Laboratory of Excellence ARBRE (ANR-11-LABX-0002-01). We acknowledge the contributions of Atko Heinsalu, Siim Veski and Jüri Vassiljev for coring and sediment dating. We also thank G. L. Simpson for valuable comments on statistical analyses. Editing services were provided by Sea Pen Scientific Writing.
Financial support was provided by institutional research grants IUT1-8 and IUT21-2 from the Estonian Science Agency and by Estonian University of Life Sciences, project No. 8M160101PKLJ. We are grateful to Christian Hossann (INRA Nancy, Champenoux) for assistance in carbon stable isotope analysis. The PTEF facility is supported by the French National Research Agency through the Laboratory of Excellence ARBRE (ANR-11-LABX-0002-01). We acknowledge the contributions of Atko Heinsalu, Siim Veski and Jüri Vassiljev for coring and sediment dating. We also thank G. L. Simpson for valuable comments on statistical analyses. Editing services were provided by Sea Pen Scientific Writing.
Kirjeldus
Märksõnad
climate change, benthic food web, large lake, carbon stable isotope, subfossil chironomid, articles