Allochthony, fatty acid and mercury trends in muscle of Eurasian perch (Perca fluviatilis) along boreal environmental gradients.
Autor: | Keva O; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland. Electronic address: ossi.keva@jyu.fi., Kiljunen M; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland., Hämäläinen H; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland., Jones RI; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland., Kahilainen KK; Lammi Biological Station, University of Helsinki, Pääjärventie 320, FI-16900 Lammi, Finland., Kankaala P; Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland., Laine MB; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland., Schilder J; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland., Strandberg U; Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland., Vesterinen J; Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland; Association for Water and Environment of Western Uusimaa, Lohja, Finland., Taipale SJ; Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35 (YA), FI-40014 Jyväskylä, Finland. |
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Jazyk: | angličtina |
Zdroj: | The Science of the total environment [Sci Total Environ] 2022 Sep 10; Vol. 838 (Pt 1), pp. 155982. Date of Electronic Publication: 2022 May 16. |
DOI: | 10.1016/j.scitotenv.2022.155982 |
Abstrakt: | Environmental change, including joint effects of increasing dissolved organic carbon (DOC) and total phosphorus (TP) in boreal northern lakes may affect food web energy sources and the biochemical composition of organisms. These environmental stressors are enhanced by anthropogenic land-use and can decrease the quality of polyunsaturated fatty acids (PUFAs) in seston and zooplankton, and therefore, possibly cascading up to fish. In contrast, the content of mercury in fish increases with lake browning potentially amplified by intensive forestry practises. However, there is little evidence on how these environmental stressors simultaneously impact beneficial omega-3 fatty acid (n3-FA) and total mercury (THg) content of fish muscle for human consumption. A space-for-time substitution study was conducted to assess whether environmental stressors affect Eurasian perch (Perca fluviatilis) allochthony and muscle nutritional quality [PUFA, THg, and their derivative, the hazard quotient (HQ)]. Perch samples were collected from 31 Finnish lakes along pronounced lake size (0.03-107.5 km 2 ), DOC (5.0-24.3 mg L -1 ), TP (5-118 μg L -1 ) and land-use gradients (forest: 50.7-96.4%, agriculture: 0-32.6%). These environmental gradients were combined using principal component analysis (PCA). Allochthony for individual perch was modelled using source and consumer δ 2 H values. Perch allochthony increased with decreasing lake pH and increasing forest coverage (PC1), but no correlation between lake DOC and perch allochthony was found. Perch muscle THg and omega-6 fatty acid (n6-FA) content increased with PC1 parallel with allochthony. Perch muscle DHA (22:6n3) content decreased, and ALA (18:3n3) increased towards shallower murkier lakes (PC2). Perch allochthony was positively correlated with muscle THg and n6-FA content, but did not correlate with n3-FA content. Hence, the quality of perch muscle for human consumption decreases (increase in HQ) with increasing forest coverage and decreasing pH, potentially mediated by increasing fish allochthony. Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.) |
Databáze: | MEDLINE |
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