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Old sins have long shadows: climate change weakens efficiency of trophic coupling of phyto- and zooplankton in a deep oligo-mesotrophic lowland lake (Stechlin, Germany)—a causality analysis

  • Géza B. Selmeczy
  • András Abonyi
  • Lothar Krienitz
  • Peter Kasprzak
  • Peter Casper
  • András Telcs
  • Zoltán Somogyvári
  • Judit Padisák
PHYTOPLANKTON & BIOTIC INTERACTIONS

Abstract

Analysis of a long-term (1994–2014) data set of phytoplankton and zooplankton in the deep, dimictic, oligo-mesotrophic Lake Stechlin (Germany) revealed trend-like changes: phytoplankton biomass and resource use efficiency increased with proliferation of heterocytic cyanobacteria (Dolichospermum spp. and Aphanizomenon flos-aquae), and those of especially large-sized zooplankton (Eudiaptomus, Eurytemora) decreased. These reverse trends are clear eutrophication symptoms and suggest a long-term trophic decoupling with potential decrease in energy transport towards higher tropic levels. Total phosphorus increased significantly over time; however, there is no known external P load for Lake Stechlin. Causality analysis enabled us to identify the primary reason of the observed changes. According to the results, stronger and longer-lasting stratification (measured as relative water column stability) drove the observed changes and the gradual regime shift was initiated by an extreme weather event—both indicating that climate change has been the crucial driver of the planktic community in this lake. Our study also documents that there might be decadal delays between cause and consequences in aquatic food webs, supporting the essential importance of long-term monitoring efforts.

Keywords

Stratification patterns Trophic interactions Functional community composition Resource use efficiency Thermal pollution 

Notes

Acknowledgements

We thank Michael Sachtleben, Maren Lentz, Uta Mallok, Monika Papke, Elfie Huth and Adelheid Scheffler for their field and laboratory assistance. Data processing and causality analysis were supported by the National Research Development and Innovation Office (NKFIH K120595, NKFIH-K113147, NN118902, Hungarian National Brain Research Program II., 2017-1.2.1-NKP-2017-00002). Trend analysis of environmental and biological parameters in relation to ecosystem functioning at each trophic level was supported by the National Research Development and Innovation Office (NKFIH PD 124681).

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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Géza B. Selmeczy
    • 1
  • András Abonyi
    • 2
  • Lothar Krienitz
    • 3
  • Peter Kasprzak
    • 3
  • Peter Casper
    • 3
  • András Telcs
    • 4
    • 5
  • Zoltán Somogyvári
    • 5
    • 6
  • Judit Padisák
    • 1
    • 7
  1. 1.Department of LimnologyUniversity of PannoniaVeszprémHungary
  2. 2.Institute of Ecology and Botany, MTA Centre for Ecological ResearchVácrátótHungary
  3. 3.Department of Experimental LimnologyLeibniz-Institute of Freshwater Ecology and Inland FisheriesStechlinGermany
  4. 4.MTA-PE Budapest Ranking Research GroupVeszprémHungary
  5. 5.Theoretical Neuroscience and Complex Systems Research Group, Department of Computational SciencesMTA Wigner Research Center for PhysicsBudapestHungary
  6. 6.Neuromicrosystems LTDBudapestHungary
  7. 7.MTA-PE Limnoecology Research GroupVeszprémHungary

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