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| Titel |
Environmental change within the Balkan region during the past ca. 50 ka recorded in the sediments from lakes Prespa and Ohrid |
| VerfasserIn |
B. Wagner, H. Vogel, G. Zanchetta, R. Sulpizio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 10 ; Nr. 7, no. 10 (2010-10-19), S.3187-3198 |
| Datensatznummer |
250005018
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| Publikation (Nr.) |
 copernicus.org/bg-7-3187-2010.pdf |
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| Zusammenfassung |
| Lakes Prespa and Ohrid, in the Balkan region, are considered to be amongst
the oldest lakes in Europe. Both lakes are hydraulically connected via karst
aquifers. From Lake Ohrid, several sediment cores up to 15 m long have been
studied over the last few years. Here, we document the first long sediment
record from nearby Lake Prespa to clarify the influence of Lake Prespa on
Lake Ohrid and the environmental history of the region. Radiocarbon dating
and dated tephra layers provide robust age control and indicate that the
10.5 m long sediment record from Lake Prespa reaches back to 48 ka. Glacial
sedimentation is characterized by low organic matter content and absence of
carbonates in the sediments, which indicate oligotrophic conditions in both
lakes. Holocene sedimentation is characterized by particularly high
carbonate content in Lake Ohrid and by particularly high organic matter
content in Lake Prespa, which indicates a shift towards more mesotrophic
conditions in the latter. Long-term environmental change and short-term
events, such as related to the Heinrich events during the Pleistocene or the 8.2 ka
cooling event during the Holocene, are well recorded in both lakes, but are
only evident in certain proxies. The comparison of the sediment cores from
both lakes indicates that environmental change affects particularly the
trophic state of Lake Prespa due to its lower volume and water depth. |
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