Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient
Subarctic lakes are getting warmer and more productive due to the joint effects of climate change and intensive land-use practices (e.g. forest clear-cutting and peatland ditching), processes that potentially increase leaching of peat- and soil-stored mercury into lake ecosystems. We sampled biotic...
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Online Access: | https://hdl.handle.net/11250/2831399 https://doi.org/10.1016/j.scitotenv.2021.146261 |
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fthsinnlandet:oai:brage.inn.no:11250/2831399 2024-03-03T08:49:01+00:00 Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient Kozak, Natalia Ahonen, Salla A. Keva, Ossi Østbye, Kjartan Taipale, Sami J. Hayden, Brian Kahilainen, Kimmo K. 2021 application/pdf https://hdl.handle.net/11250/2831399 https://doi.org/10.1016/j.scitotenv.2021.146261 eng eng Science of the Total Environment. 2021, 779 . urn:issn:0048-9697 https://hdl.handle.net/11250/2831399 https://doi.org/10.1016/j.scitotenv.2021.146261 cristin:1920347 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no 11 779 Science of the Total Environment Peer reviewed Journal article 2021 fthsinnlandet https://doi.org/10.1016/j.scitotenv.2021.146261 2024-02-02T12:42:27Z Subarctic lakes are getting warmer and more productive due to the joint effects of climate change and intensive land-use practices (e.g. forest clear-cutting and peatland ditching), processes that potentially increase leaching of peat- and soil-stored mercury into lake ecosystems. We sampled biotic communities from primary producers (algae) to top consumers (piscivorous fish), in 19 subarctic lakes situated on a latitudinal (69.0–66.5° N), climatic (+3.2 °C temperature and +30% precipitation from north to south) and catchment land-use (pristine to intensive forestry areas) gradient. We first tested how the joint effects of climate and productivity influence mercury biomagnification in food webs focusing on the trophic magnification slope (TMS) and mercury baseline (THg baseline) level, both derived from linear regression between total mercury (log10THg) and organism trophic level (TL). We examined a suite of environmental and biotic variables thought to explain THg baseline and TMS with stepwise generalized multiple regression models. Finally, we assessed how climate and lake productivity affect the THg content of top predators in subarctic lakes. We found biomagnification of mercury in all studied lakes, but with variable TMS and THg baseline values. In stepwise multiple regression models, TMS was best explained by negative relationships with food chain length, climate-productivity gradient, catchment properties, and elemental C:N ratio of the top predator (full model R2 = 0.90, p < 0.001). The model examining variation in THg baseline values included the same variables with positive relationships (R2 = 0.69, p = 0.014). Mass-standardized THg content of a common top predator (1 kg northern pike, Esox lucius) increased towards warmer and more productive lakes. Results indicate that increasing eutrophication via forestry-related land-use activities increase the THg levels at the base of the food web and in top predators, suggesting that the sources of nutrients and mercury should be considered in future ... Article in Journal/Newspaper Subarctic Høgskolen i Innlandet: Brage INN Science of The Total Environment 779 146261 |
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Open Polar |
collection |
Høgskolen i Innlandet: Brage INN |
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fthsinnlandet |
language |
English |
description |
Subarctic lakes are getting warmer and more productive due to the joint effects of climate change and intensive land-use practices (e.g. forest clear-cutting and peatland ditching), processes that potentially increase leaching of peat- and soil-stored mercury into lake ecosystems. We sampled biotic communities from primary producers (algae) to top consumers (piscivorous fish), in 19 subarctic lakes situated on a latitudinal (69.0–66.5° N), climatic (+3.2 °C temperature and +30% precipitation from north to south) and catchment land-use (pristine to intensive forestry areas) gradient. We first tested how the joint effects of climate and productivity influence mercury biomagnification in food webs focusing on the trophic magnification slope (TMS) and mercury baseline (THg baseline) level, both derived from linear regression between total mercury (log10THg) and organism trophic level (TL). We examined a suite of environmental and biotic variables thought to explain THg baseline and TMS with stepwise generalized multiple regression models. Finally, we assessed how climate and lake productivity affect the THg content of top predators in subarctic lakes. We found biomagnification of mercury in all studied lakes, but with variable TMS and THg baseline values. In stepwise multiple regression models, TMS was best explained by negative relationships with food chain length, climate-productivity gradient, catchment properties, and elemental C:N ratio of the top predator (full model R2 = 0.90, p < 0.001). The model examining variation in THg baseline values included the same variables with positive relationships (R2 = 0.69, p = 0.014). Mass-standardized THg content of a common top predator (1 kg northern pike, Esox lucius) increased towards warmer and more productive lakes. Results indicate that increasing eutrophication via forestry-related land-use activities increase the THg levels at the base of the food web and in top predators, suggesting that the sources of nutrients and mercury should be considered in future ... |
format |
Article in Journal/Newspaper |
author |
Kozak, Natalia Ahonen, Salla A. Keva, Ossi Østbye, Kjartan Taipale, Sami J. Hayden, Brian Kahilainen, Kimmo K. |
spellingShingle |
Kozak, Natalia Ahonen, Salla A. Keva, Ossi Østbye, Kjartan Taipale, Sami J. Hayden, Brian Kahilainen, Kimmo K. Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
author_facet |
Kozak, Natalia Ahonen, Salla A. Keva, Ossi Østbye, Kjartan Taipale, Sami J. Hayden, Brian Kahilainen, Kimmo K. |
author_sort |
Kozak, Natalia |
title |
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
title_short |
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
title_full |
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
title_fullStr |
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
title_full_unstemmed |
Environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
title_sort |
environmental and biological factors are joint drivers of mercury biomagnification in subarctic lake food webs along a climate and productivity gradient |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2831399 https://doi.org/10.1016/j.scitotenv.2021.146261 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
11 779 Science of the Total Environment |
op_relation |
Science of the Total Environment. 2021, 779 . urn:issn:0048-9697 https://hdl.handle.net/11250/2831399 https://doi.org/10.1016/j.scitotenv.2021.146261 cristin:1920347 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_doi |
https://doi.org/10.1016/j.scitotenv.2021.146261 |
container_title |
Science of The Total Environment |
container_volume |
779 |
container_start_page |
146261 |
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1792506085128536064 |