A comparison of sediment and monitoring data: Implications for paleomonitoring a small lake

Long-term limnological monitoring data (from 1971 to 2001) were compared with sediment core record in Lake Viitna Linajärv (hereafter L. Viitna), a small lake in northern Estonia. The monitoring data show that L. Viitna changed from mesotrophic in the 1970s to eutrophic in the 1990s. The trends of p...

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Bibliographic Details
Published in:Environmental monitoring and assessment 2003-11, Vol.89 (1), p.1-13
Main Authors: PUNNING, Jaan-Mati, LEEBEN, Aina
Format: Article
Language:English
Subjects:
Comparative analysis
Earth sciences
Earth, ocean, space
Ecosystem
Environmental Monitoring
Estonia
Eutrophication
Exact sciences and technology
Fossils
Freshwater
Geologic Sediments - chemistry
Hypolimnion
Lakes
Marine and continental quaternary
Oxygen demand
Paleobotany
Paleontology
Phosphorus - metabolism
Pigments, Biological
Seasons
Sediment-water interface
Sediments
Studies
Surficial geology
Water levels
Water Supply
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Summary:Long-term limnological monitoring data (from 1971 to 2001) were compared with sediment core record in Lake Viitna Linajärv (hereafter L. Viitna), a small lake in northern Estonia. The monitoring data show that L. Viitna changed from mesotrophic in the 1970s to eutrophic in the 1990s. The trends of paleodata that integrate the changes in the biogeochemical matter cycling in the lake over 2-3 years have clear signals about changes in the state of the ecosystem in L. Viitna during the last decades. A gradual increase in organic productivity should reflect a greater oxygen demand in the hypolimnion. As a result the hypolimnion became seasonally anoxic earlier and its pH level remained low for a longer time. These fundamental changes near the sediment-water interface were recorded in the sediment core. The greatest changes occurred at the beginning of the 1980s (layers at a depth of ca. 20 cm), when the meso(eu?)trophic conditions in L. Viitna started to become increasingly more eutrophic. The variations of paleorecords in the upper part of the sediment core coincide temporally with changes in the water level of the lake.
ISSN:0167-6369
1573-2959
DOI:10.1023/A:1025825823319