Stratigraphic analysis of lake level fluctuations in Lake Ohrid: an integration of high resolution hydro-acoustic data and sediment cores

Lindhorst, Katja, Vogel, H., Krastel, Sebastian, Wagner, B., Hilgers, A., Zander, A., Schwenk, T., Wessels, M. and Daut, G. (2010) Stratigraphic analysis of lake level fluctuations in Lake Ohrid: an integration of high resolution hydro-acoustic data and sediment cores Biogeosciences (BG), 7 (11). pp. 3531-3548. DOI 10.5194/bg-7-3531-2010.

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Abstract

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 60m water depth. According to our data, significant lake level fluctuations with prominent lowstands of ca. 60 and 35m 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 sublacustrine 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.

Document Type: Article
Keywords: Seismology; Geophysics; Lake Ohrid, multichannel seismic, sediment echosounder, bathymetry, lake level fluctuation, seismic stratigraphy
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-JRG-B4 Submarine Hazards
Refereed: Yes
DOI etc.: 10.5194/bg-7-3531-2010
ISSN: 1726-4170
Projects: Lake Ohrid (1352-KR 222/7-2), Future Ocean
Date Deposited: 06 Dec 2010 07:53
Last Modified: 06 Jul 2012 15:13
URI: http://eprints.uni-kiel.de/id/eprint/10265

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