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Effects on the food-web structure and bioaccumulation patterns of organic contaminants in a climate-altered Bothnian Sea mesocosms
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry. Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, Italy.
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (UMFpub; EcoChange)
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2023 (English)In: Frontiers in Marine Science, E-ISSN 2296-7745, Vol. 10, article id 1244434Article in journal (Refereed) Published
Abstract [en]

Climate change is expected to alter global temperature and precipitation patterns resulting in complex environmental impacts. The proposed higher precipitation in northern Scandinavia would increase runoff from land, hence increase the inflow of terrestrial dissolved organic matter (tDOM) in coastal regions. This could promote heterotrophic bacterial production and shift the food web structure, by favoring the microbial food web. The altered climate is also expected to affect transport and availability of organic micropollutants (MPs), with downstream effects on exposure and accumulation in biota. This study aimed to assess climate-induced changes in a Bothnian Sea food web structure as well as bioaccumulation patterns of MPs. We performed a mesocosms-study, focusing on aquatic food webs with fish as top predator. Alongside increased temperature, mesocosm treatments included tDOM and MP addition. The tDOM addition affected nutrient availability and boosted both phytoplankton and heterotrophic bacteria in our fairly shallow mesocosms. The increased tDOM further benefitted flagellates, ciliates and mesozooplankton, while the temperature increase and MP addition had minor effect on those organism groups. Temperature, on the other hand, had a negative impact on fish growth and survival, whereas tDOM and MP addition only had minor impact on fish. Moreover, there were indications that bioaccumulation of MPs in fish either increased with tDOM addition or decreased at higher temperatures. If there was an impact on bioaccumulation, moderately lipophilic MPs (log Kow 3.6 - 4.6) were generally affected by tDOM addition and more lipophilic MPs (log Kow 3.8 to 6.4) were generally affected by increased temperature. This study suggest that both increased temperatures and addition of tDOM likely will affect bioaccumulation patterns of MPs in shallow coastal regions, albeit with counteracting effects.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2023. Vol. 10, article id 1244434
Keywords [en]
organic contaminants, climate impact, food web, bioaccumulation, ecology, Bothnian Sea
National Category
Environmental Sciences Ecology
Identifiers
URN: urn:nbn:se:umu:diva-217906DOI: 10.3389/fmars.2023.1244434ISI: 001092680700001OAI: oai:DiVA.org:umu-217906DiVA, id: diva2:1821369
Funder
Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGE, 2009-149The Kempe FoundationsAvailable from: 2023-12-20 Created: 2023-12-20 Last updated: 2024-07-23Bibliographically approved

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Berglund, Åsa M. M.Gallampois, ChristineRipszam, MatyasLarsson, HenrikFigueroa, DanielaByström, PärHaglund, PeterAndersson, AgnetaTysklind, Mats

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Berglund, Åsa M. M.Gallampois, ChristineRipszam, MatyasLarsson, HenrikFigueroa, DanielaByström, PärHaglund, PeterAndersson, AgnetaTysklind, Mats
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Department of Ecology and Environmental SciencesDepartment of ChemistryUmeå Marine Sciences Centre (UMF)
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