Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau

16 m water depth – a chironomid depth threshold?

  • Andreas Laug | a.laug@tu-braunschweig.de Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Germany. https://orcid.org/0000-0002-5892-6725
  • Falko Turner Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Germany.
  • Stefan Engels Department of Geography, Birkbeck University of London, United Kingdom. https://orcid.org/0000-0002-2078-0361
  • Junbo Wang Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL)/ Nam Co Observation and Research Station (NAMORS), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing , China. https://orcid.org/0000-0003-2335-519X
  • Torsten Haberzettl Institute of Geography and Geology, University of Greifswald, Germany. https://orcid.org/0000-0002-6975-9774
  • Jianting Ju Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL)/ Nam Co Observation and Research Station (NAMORS), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing , China.
  • Siwei Yu Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL)/ Nam Co Observation and Research Station (NAMORS), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing , China. https://orcid.org/0000-0003-0828-0345
  • Qiangqiang Kou Key Laboratory of Tibetan Environment Changes and Land Surface Processes (TEL)/ Nam Co Observation and Research Station (NAMORS), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing , China. https://orcid.org/0000-0003-0987-4620
  • Nicole Börner Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Germany. https://orcid.org/0000-0001-8833-6665
  • Antje Schwalb Institute of Geosystems and Bioindication, Technische Universität Braunschweig, Germany. https://orcid.org/0000-0002-4628-1958

Abstract

Fluctuating lake levels are an important driver of ecosystem change, and changes in the precipitation/evaporation balance of a region can lead to undesirable changes in ecosystem functioning. Large-scale changes in hydrology will become increasingly more likely as a result of ongoing climate change in the coming century. This is especially true for the Tibetan Plateau, which plays a crucial role as the “Asian water tower” for the surrounding densely populated regions. Chironomids (Diptera: Chironomidae) have proven to be one of the most valuable bioindicators for monitoring and reconstructing the development of aquatic ecosystems. Besides temperature, water depth and salinity are two of the most important environmental factors affecting chironomids. To study the relationship between chironomids and water depth, we analyzed surface sediment samples of two large Tibetan lakes, Selin Co and Taro Co. These lakes have similar environmental conditions (e.g. elevation, temperature and oxygenation) but show strong differences in salinity (7–10 and 0.5 ppt, respectively). Our results show that the chironomid assemblages in both lakes have similar water depths at which the fauna abruptly changes in composition, despite different faunal assemblages. The most important boundaries were identified at 0.8 and 16 m water depth. While the uppermost meter, the “splash zone”, is characterized by distinctly different conditions, resulting from waves and changing water levels, the cause of the lower zone boundary remains enigmatic. Even though none of the measured water depth-related factors, such as water temperature, oxygen content, sediment properties, light intensity or macrophyte vegetation, show a distinct change at 16 m water depth, comparison to other records show that a similar change in the chironomid fauna occurs at 16 m water depth in large, deep lakes around the world. We propose that this boundary might be connected to water pressure influencing the living conditions of the larvae or the absolute distance to the surface that has to be covered for the chironomid larvae to hatch. We conclude that water depth either directly or indirectly exerts a strong control on the chironomid assemblages even under different salinities, resulting in distribution patterns that can be used to reconstruct past fluctuations in water depths.

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Published
2020-07-01
Info
Issue
Section
Original Articles
Edited By
Valeria Lencioni, MUSE-Museo delle Scienze, Trento, Italy
Supporting Agencies
German Federal Ministry of Education and Research (BMBF), German Deutsche Forschungsgemeinschaft (DFG), Chinese Academy of Sciences (CAS), NSFC Research Fund
Keywords:
Midges, Alpine lakes, Salinity, Selin Co, Taro Co
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How to Cite
1.
Laug A, Turner F, Engels S, Wang J, Haberzettl T, Ju J, Yu S, Kou Q, Börner N, Schwalb A. Is there a common threshold to subfossil chironomid assemblages at 16 m water depth? Evidence from the Tibetan Plateau: 16 m water depth – a chironomid depth threshold?. J Limnol [Internet]. 2020Jul.1 [cited 2020Oct.29];. Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2020.1964