Tracking the Limnoecological History of Lake Hiidenvesi (Southern Finland) Using the Paleolimnological Approach

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Luoto , T P , Rantala , M V & Tammelin , M H 2017 , ' Tracking the Limnoecological History of Lake Hiidenvesi (Southern Finland) Using the Paleolimnological Approach ' , Water, Air and Soil Pollution , vol. 228 , no. 12 , 461 . https://doi.org/10.1007/s11270-017-3622-z

Title: Tracking the Limnoecological History of Lake Hiidenvesi (Southern Finland) Using the Paleolimnological Approach
Author: Luoto, Tomi P.; Rantala, Marttiina V.; Tammelin, Mira H.
Contributor organization: Environmental Sciences
Department of Geosciences and Geography
Date: 2017-12
Language: eng
Number of pages: 13
Belongs to series: Water, Air and Soil Pollution
ISSN: 0049-6979
DOI: https://doi.org/10.1007/s11270-017-3622-z
URI: http://hdl.handle.net/10138/313028
Abstract: We examined a sediment record from Lake Hiidenvesi in southern Finland using paleolimnological methods to trace its limnoecological history. In our record, beginning from the 1940s, chironomid (Diptera) assemblages shifted from typical boreal taxa towards mesotrophic community assemblages at similar to 1960-1980 CE being finally replaced by eutrophic taxa from the 1990s onward. The diatom (Bacillariophyceae) assemblages reflected relatively nutrient rich conditions throughout the record showing a further increase in eutrophic taxa from the 1970s onward. A chironomid-based reconstruction of late-winter hypolimnetic dissolved oxygen (DO) conditions suggested anoxic conditions already in the 1950s, probably reflecting increased inlake production due to allochthonous nutrient inputs and related increase in biological oxygen consumption. However, the reconstruction also indicated large variability in long-term oxygen conditions that appear typical for the basin. With regard to nutrient status, chironomid- and diatom-based reconstructions of total phosphorus (TP) showed a similar trend throughout the record, although, chironomids indicated a more straightforward eutrophication process in the benthic habitat and seemed to reflect the intensified human activities in the catchment more strongly than diatoms. The DO and TP reconstructions were mostly similar in trends compared to the measured data available since the 1970s/1980s. However, the increase in TP during the most recent years in both reconstructions was not visible in the monitored data. The results of our multiproxy study emphasize the significance of including both epilimnetic and hypolimnetic systems in water quality assessments and provide important long-term limnoecological information that will be useful in the future when setting targets for restoration.
Description: Correction: Water, Air and Soil Pollution, 230 :9 (2019), art. 228 DOI: 10.1007/s11270-019-4262-2
Subject: Chaoborus
Chironomids
Diatoms
Hypolimnetic oxygen
Nutrient enrichment
Phosphorus
HYPOLIMNETIC OXYGEN
TOTAL PHOSPHORUS
TROPHIC HISTORY
CLIMATE-CHANGE
ENVIRONMENTAL-CHANGE
INFERENCE MODEL
HEAD CAPSULES
BOREAL LAKE
INDICATORS
SEDIMENTS
1171 Geosciences
1172 Environmental sciences
114 Physical sciences
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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