Pianpian Wu, Haiyu Yan, Martin J Kainz, Brian Branfireun, Ann-Kristin Bergström, Min Jing, Kevin Bishop
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引用次数: 0
摘要
饮食摄取是将汞(Hg)等潜在有毒污染物和多不饱和脂肪酸等必需膳食营养素转移给水生食物网中营养水平较高的消费者的关键。在瑞典的7个湖泊和中国的2个水库中,我们评估了饮食来源对鱼类在湖泊食物网中汞生物积累和多聚脂肪酸滞留的作用。鱼类总汞(THg)和甲基汞(MeHg)在两国之间差异很大:中国鱼的干重(d.w)低于300 ng g-1。THg的甲基汞含量不到50%,而瑞典鱼类的THg含量约为2000 ng g-1 d.w,几乎100%为甲基汞。脂肪酸富集亚油酸(LIN)在中国鱼类中更为普遍,无论大小(p
Investigating the diet source influence on freshwater fish mercury bioaccumulation and fatty acids-Experiences from Swedish lakes and Chinese reservoirs.
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.
期刊介绍:
Ecotoxicology is an international journal devoted to the publication of fundamental research on the effects of toxic chemicals on populations, communities and terrestrial, freshwater and marine ecosystems. It aims to elucidate mechanisms and processes whereby chemicals exert their effects on ecosystems and the impact caused at the population or community level. The journal is not biased with respect to taxon or biome, and papers that indicate possible new approaches to regulation and control of toxic chemicals and those aiding in formulating ways of conserving threatened species are particularly welcome. Studies on individuals should demonstrate linkage to population effects in clear and quantitative ways. Laboratory studies must show a clear linkage to specific field situations. The journal includes not only original research papers but technical notes and review articles, both invited and submitted. A strong, broadly based editorial board ensures as wide an international coverage as possible.