Influence of season-depending ecological variables on biomarker baseline levels in mussels (Mytilus trossulus) from two Baltic Sea subregions

For reliable mussel monitoring programmes based on biomarkers, regionally relevant reference values and their natural variability need to be known. The Baltic Sea exhibits high inter-regional and seasonal variability in physical factors such as salinity, temperature and primary production. The aim o...

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Veröffentlicht in:The Science of the total environment 2019-11, Vol.689, p.1087-1103
Hauptverfasser: Benito, Denis, Ahvo, Aino, Nuutinen, Jari, Bilbao, Dennis, Saenz, Jon, Etxebarria, Nestor, Lekube, Xabier, Izagirre, Urtzi, Lehtonen, Kari K., Marigómez, Ionan, Zaldibar, Beñat, Soto, Manu
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creator Benito, Denis
Ahvo, Aino
Nuutinen, Jari
Bilbao, Dennis
Saenz, Jon
Etxebarria, Nestor
Lekube, Xabier
Izagirre, Urtzi
Lehtonen, Kari K.
Marigómez, Ionan
Zaldibar, Beñat
Soto, Manu
description For reliable mussel monitoring programmes based on biomarkers, regionally relevant reference values and their natural variability need to be known. The Baltic Sea exhibits high inter-regional and seasonal variability in physical factors such as salinity, temperature and primary production. The aim of this pilot study is to depict the effects of season-related environmental factors in a selected battery of biomarkers in two environmentally different subregions of the Baltic Sea to help establishing reference data for biochemical, cellular and tissue-level biomarkers. In order to achieve that, mussels were collected from reference sites in Kiel (Germany) and Tvärminne (Finland) during three seasons: summer and autumn 2016, and spring 2017. Finally, in order to characterize the ecological situation, analysis of the chemical tissue burden was performed and chlorophyll‑a and particulate organic carbon concentration and temperature changes were analyzed at each sampling locality using satellite remote sensing images. An integrated biomarker response index was performed to summarize the biomarker responses of each locality and season. The biochemical endpoints showed seasonal variability regulated by temperature, food supply and reproductive cycle, while among the cellular endpoints only lipofuscin accumulation and lysosomal structural changes showed slight seasonal variation. Seasonal changes in tissue level biomarkers were observed only at the northern Baltic Sea site Tvärminne, dictated by the demanding energetic trade-off caused by reproduction. In conclusion, the characterization of the ecological variables and physico-chemical conditions at each site, is crucial to perform a reliable assessment of the effects of a hypothetical pollution scenario in the Baltic Sea. Moreover, reference levels of biomarkers and their responses to natural environmental conditions must be established. [Display omitted] •Baltic Sea presents regional and seasonal changes that condition responses in mussels.•Food supply dictated reproductive cycle and consequently biomarker response.•Seasonal variability unequally reflected at different biological organization levels.•Combination of biological and ecological data necessary for biomarker approach
doi_str_mv 10.1016/j.scitotenv.2019.06.412
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The biochemical endpoints showed seasonal variability regulated by temperature, food supply and reproductive cycle, while among the cellular endpoints only lipofuscin accumulation and lysosomal structural changes showed slight seasonal variation. Seasonal changes in tissue level biomarkers were observed only at the northern Baltic Sea site Tvärminne, dictated by the demanding energetic trade-off caused by reproduction. In conclusion, the characterization of the ecological variables and physico-chemical conditions at each site, is crucial to perform a reliable assessment of the effects of a hypothetical pollution scenario in the Baltic Sea. Moreover, reference levels of biomarkers and their responses to natural environmental conditions must be established. 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subjects Baltic Sea
Biomarkers
Biomonitoring
Reference values
title Influence of season-depending ecological variables on biomarker baseline levels in mussels (Mytilus trossulus) from two Baltic Sea subregions
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