High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery

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Rask , M , Malinen , T , Olin , M , Nyberg , K , Ruuhijarvi , J , Kahilainen , K K , Verta , M , Vuorenmaa , J , Blauberg , T-R & Arvola , L 2021 , ' High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery ' , Water, Air and Soil Pollution , vol. 232 , 382 . https://doi.org/10.1007/s11270-021-05303-z

Title: High Mercury Concentrations of European Perch (Perca fluviatilis) in Boreal Headwater Lakes with Variable History of Acidification and Recovery
Author: Rask, Martti; Malinen, Tommi; Olin, Mikko; Nyberg, Kari; Ruuhijarvi, Jukka; Kahilainen, Kimmo K.; Verta, Matti; Vuorenmaa, Jussi; Blauberg, Tarja-Riitta; Arvola, Lauri
Other contributor: University of Helsinki, Lammi Biological Station
University of Helsinki, Biological stations
University of Helsinki, Kilpisjärvi Biological Station
University of Helsinki, Biological stations
University of Helsinki, Lammi Biological Station


Date: 2021-09
Language: eng
Number of pages: 15
Belongs to series: Water, Air and Soil Pollution
ISSN: 0049-6979
DOI: https://doi.org/10.1007/s11270-021-05303-z
URI: http://hdl.handle.net/10138/334591
Abstract: High dissolved organic carbon and low pH are often associated with elevated mercury content of fish in boreal lakes, but less is known about the fish mercury dynamics in lakes recovering from acidification stress. We measured total mercury concentration (THg) in muscle of European perch (Perca fluviatilis) and evaluated the overall correlation with environmental and growth variables in 24 boreal headwater lakes in the 2010s. We found negative correlations of length-corrected perch THg with lake pH and perch growth, but no correlation with dissolved organic carbon. The main emphasis in the present study was focused to a subset of ten lakes in southern Finland with known perch THg during severe acidification in the 1980-1990s. The comparison of perch THg concentrations in the 2010s with values determined in the 1980-1990s showed a sharp increase in most acidic lakes where the perch populations suffered from severe acid stress in the 1980s. This increase was attributed to growth condensation caused by sharp decrease in perch growth during recovery of reproduction capacity and the consequent increases in population densities of perch. Our results highlight the importance of perch growth rate and population density for understanding the variability of fish Hg in boreal headwater lakes, where recovery from acidification can lead to higher mercury concentration of fish in certain cases.
Subject: THg
Low pH
Dissolved organic carbon
Growth dilution
Population density
Reproduction failure
DISSOLVED ORGANIC-CARBON
ROACH RUTILUS-RUTILUS
YELLOW PERCH
HUMIC LAKE
SUBSEQUENT RESPONSES
METHYLMERCURY CYCLE
NORWEGIAN LAKES
FISH POPULATION
ACIDIFIED LAKE
SURFACE WATERS
1172 Environmental sciences
1171 Geosciences
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