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Forskningsartikel2023Vetenskapligt granskad

Investigating the diet source influence on freshwater fish mercury bioaccumulation and fatty acids-Experiences from Swedish lakes and Chinese reservoirs

Wu, Pianpian; Yan, Haiyu; Kainz, Martin J.; Branfireun, Brian; Bergstroem, Ann-Kristin; Jing, Min; Bishop, Kevin

Sammanfattning

Dietary uptake is key for transferring potentially toxic contaminants, such as mercury (Hg) and essential dietary nutrients, such as polyunsaturated fatty acids (PUFA), to consumers at higher trophic levels of aquatic food webs. We evaluated the role of diet sources for Hg bioaccumulation and PUFA retention in fish across lake food webs in seven Swedish lakes and two Chinese reservoirs. Fish total Hg (THg) and methyl-Hg (MeHg) differed greatly between the two countries: the Chinese fish contained less than 300 ng g(-1) dry weight (d.w.) THg with less than 50% as MeHg, versus the Swedish fishes which contained approximately 2000 ng g(-1) d.w. THg and nearly 100% as MeHg. Fatty acids enrichment of linoleic acids (LIN) were more prevalent in the Chinese fishes regardless of size (p < 0.05). Here we examined food web length, fish growth rates, and fatty acids patterns in relation to the quality of fish as a food source for both Hg and FA. Contrary to the expectation that biodilution of Hg throughout the food chain would explain these differences, a more complex picture emerged with high levels of Hg at the base of the food web in the Chinese reservoirs, a decoupling of fatty acid and Hg bioaccumulation, and a major role for both fish stocking and fish feed. It is hoped that this work will provide a nuanced picture of fish quality as a food source in different ecosystems.

Publicerad i

Ecotoxicology
2023,
Utgivare: SPRINGER

      SLU författare

      • Globala målen

      SDG14 Bevara och nyttja haven och de marina resurserna på ett hållbart sätt för en hållbar utveckling
      SDG3 Säkerställa hälsosamma liv och främja välbefinnande för alla i alla åldrar
      SDG2 Avskaffa hunger, uppnå tryggad livsmedelsförsörjning och förbättrad nutrition samt främja ett hållbart jordbruk

      UKÄ forskningsämne

      Miljövetenskap
      Ekologi

      Publikationens identifierare

      DOI: https://doi.org/10.1007/s10646-023-02712-0

      Permanent länk till denna sida (URI)

      https://res.slu.se/id/publ/127115