BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-7-3531-2010 Stratigraphic analysis of lake level fluctuations in Lake Ohrid: an integration of high resolution hydro-acoustic data and sediment cores Lindhorst K. 1 Vogel H. 2 Krastel S. 1 Wagner B. 2 Hilgers A. 3 Zander A. 3 Schwenk T. 4 Wessels M. 5 Daut G. 6 Leibniz-Institute for Marine Sciences, IFM-GEOMAR, Cluster of Excellence: The Future Ocean, Christian-Albrecht-University, Kiel, Germany Institute for Geology and Mineralogy, University of Cologne, Cologne, Germany Institute of Geography, University of Cologne, Cologne, Germany Department of Geosciences at University of Bremen, Bremen, Germany Institute for Lake Research, LUBW, Langenargen, Germany Institute for Geography, Friedrich Schiller University, Jena, Germany 10 11 2010 7 11 3531 3548 Copyright: © 2010 K. Lindhorst et al. 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/7/3531/2010/bg-7-3531-2010.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/7/3531/2010/bg-7-3531-2010.pdf

Ancient Lake Ohrid is a steep-sided, oligotrophic, karst lake that was tectonically formed most likely within the Pliocene and often referred to as a hotspot of endemic biodiversity. This study aims on tracing significant lake level fluctuations at Lake Ohrid using high-resolution acoustic data in combination with lithological, geochemical, and chronological information from two sediment cores recovered from sub-aquatic terrace levels at ca. 32 and 60 m water depth. According to our data, significant lake level fluctuations with prominent lowstands of ca. 60 and 35 m below the present water level occurred during Marine Isotope Stage (MIS) 6 and MIS 5, respectively. The effect of these lowstands on biodiversity in most coastal parts of the lake is negligible, due to only small changes in lake surface area, coastline, and habitat. In contrast, biodiversity in shallower areas was more severely affected due to disconnection of today sub-lacustrine springs from the main water body. Multichannel seismic data from deeper parts of the lake clearly image several clinoform structures stacked on top of each other. These stacked clinoforms indicate significantly lower lake levels prior to MIS 6 and a stepwise rise of water level with intermittent stillstands since its existence as water-filled body, which might have caused enhanced expansion of endemic species within Lake Ohrid.

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