Effects on the food-web structure and bioaccumulation patterns of organic contaminants in a climate-altered Bothnian Sea mesocosms

Frontiers in Marine Science

Marine Science

Peter Haglund¹  Christine Gallampois¹  Mats Tysklind¹  Matyas Ripszam²  Pär Byström³  Åsa M. M. Berglund³  Daniela A. Figueroa³  Agneta Andersson⁴  Elena Gorokhova⁵  Evelina Grinienė⁶  Henrik Larsson⁷ 

[1] Department of Chemistry, Umeå University, Umeå, Sweden;Department of Chemistry, Umeå University, Umeå, Sweden;Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, Italy;Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden;Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden;Umeå Marine Sciences Centre, Umeå University, Hörnefors, Sweden;Department of Environmental Science, Stockholm University, Stockholm, Sweden;Marine Research Institute, Klaipėda University, Klaipėda, Lithuania;Umeå Marine Sciences Centre, Umeå University, Hörnefors, Sweden;

关键词: organic contaminants;    climate impact;    food web;    bioaccumulation;    ecology;    Bothnian Sea;   

DOI  :  10.3389/fmars.2023.1244434

 received in 2023-06-22, accepted in 2023-09-27,  发布年份 2023

来源: Frontiers

【 摘 要 】

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.

【 授权许可】

Unknown   
Copyright © 2023 Berglund, Gallampois, Ripszam, Larsson, Figueroa, Grinienė, Byström, Gorokhova, Haglund, Andersson and Tysklind