Effect of aquaculture on mercury and polyunsaturated fatty acids in fishes from reservoirs in Southwest China

Min, Jiyoung; Lin, Dan; Wu, Pianpian; Kainz, Martin J.; Bishop, Kevin; Yan, Haiyu; Wang, Rui; Wang, Qing; Li, Qiuhua

doi:10.1016/j.envpol.2019.113543

Cited by 13 publications

(2 citation statements)

References 52 publications

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“…Fish Hg concentrations are generally low across China because of fast-growing farmed and stocked fish species dominance, coupling with declining wild fish populations in freshwaters where trophic level enrichment of MeHg is generally dampened by eutrophication, and water chemistry parameters (e.g., alkaline pH and low dissolved organic carbon) that are not conducive to high methylation rates (Cheng and Hu 2012 ; Liu et al 2012 ). Minimal shoreline wetland area due to anthropogenic activities, lower trophic biomagnification factor in temperate freshwater food webs compared to boreal ones, and the general lack of trophic level 4 fish in eutrophic waters also contribute to patterns of lower fish Hg concentrations (Chen et al 2008 ; Liu et al 2012 ; Xu et al 2018 ; Wang and Wang 2019 ; Wu et al 2019 ; Jing et al 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Evers,

Ackerman,

Åkerblom

et al. 2024

Ecotoxicology

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An important provision of the Minamata Convention on Mercury is to monitor and evaluate the effectiveness of the adopted measures and its implementation. Here, we describe for the first time currently available biotic mercury (Hg) data on a global scale to improve the understanding of global efforts to reduce the impact of Hg pollution on people and the environment. Data from the peer-reviewed literature were compiled in the Global Biotic Mercury Synthesis (GBMS) database (>550,000 data points). These data provide a foundation for establishing a biomonitoring framework needed to track Hg concentrations in biota globally. We describe Hg exposure in the taxa identified by the Minamata Convention: fish, sea turtles, birds, and marine mammals. Based on the GBMS database, Hg concentrations are presented at relevant geographic scales for continents and oceanic basins. We identify some effective regional templates for monitoring methylmercury (MeHg) availability in the environment, but overall illustrate that there is a general lack of regional biomonitoring initiatives around the world, especially in Africa, Australia, Indo-Pacific, Middle East, and South Atlantic and Pacific Oceans. Temporal trend data for Hg in biota are generally limited. Ecologically sensitive sites (where biota have above average MeHg tissue concentrations) have been identified throughout the world. Efforts to model and quantify ecosystem sensitivity locally, regionally, and globally could help establish effective and efficient biomonitoring programs. We present a framework for a global Hg biomonitoring network that includes a three-step continental and oceanic approach to integrate existing biomonitoring efforts and prioritize filling regional data gaps linked with key Hg sources. We describe a standardized approach that builds on an evidence-based evaluation to assess the Minamata Convention’s progress to reduce the impact of global Hg pollution on people and the environment.

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Section: Resultsmentioning

confidence: 99%

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Evers,

Ackerman,

Åkerblom

et al. 2024

Ecotoxicology

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“…When the proportion of ω3 LC‐PUFAs in the food increased, the concentration of highly bioavailable methyl Hg (MeHg) in fish decreased significantly (Schultz et al ., 2012). This was further confirmed in streams of southern Norway (De Wit, Kainz & Lindholm, 2012) and subtropical reservoirs (Jing et al ., 2020). MeHg in fish comes mainly from food sources (Hall et al ., 1997) and is significantly affected by food quality (Simonin et al ., 2008; Jardine, Kidd & O'Driscoll, 2013).…”

Section: Impact Of Environmental Change On High‐quality ω3‐pufa‐conta...mentioning

confidence: 99%

The importance of omega‐3 polyunsaturated fatty acids as high‐quality food in freshwater ecosystems with implications of global change

Yan,

Guo,

Kainz

et al. 2023

Biological Reviews

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Traditionally, trophic ecology research on aquatic ecosystems has focused more on the quantity of dietary energy flow within food webs rather than food quality and its effects on organisms at various trophic levels. Recent studies emphasize that food quality is central to consumer growth and reproduction, and the importance of food quality for aquatic ecosystems has become increasingly well recognized. It is timely to synthesise these findings and identify potential future research directions. We conducted a systematic review of omega‐3 polyunsaturated fatty acids (ω3‐PUFAs) as a crucial component of high‐quality food sources in freshwater ecosystems to evaluate their impact on a variety of consumers, and explore the effects of global change on these high‐quality food sources and their transfer to higher trophic consumers within and across ecosystems. In freshwater ecosystems, algae rich in ω3 long‐chain PUFAs, such as diatoms, dinoflagellates and cryptophytes, represent important high‐quality food sources for consumers, whereas cyanobacteria, green algae, terrestrial vascular plants and macrophytes low in ω3 long‐chain PUFAs are low‐quality food sources. High‐quality ω3‐PUFA‐containing food sources usually lead to increased growth and reproduction of aquatic consumers, e.g. benthic invertebrates, zooplankton and fish, and also provide ω3 long‐chain PUFAs to riparian terrestrial consumers via emergent aquatic insects. Consumers feeding on high‐quality ω3‐PUFA‐containing foods in turn represent high‐quality food for their own predators. However, the ω3‐PUFA content of food sources is sensitive to global environmental changes. Warming, eutrophication, increased light intensity (e.g. from loss of riparian shading), and pollutants potentially inhibit the synthesis of algal ω3‐PUFAs while at the same time promoting the growth of lower‐quality foods, such as cyanobacteria and green algae. These factors combined could lead to a significant reduction in the availability of ω3‐PUFAs for consumers and constrain their overall fitness. Although the effect of individual environmental factors on high‐quality ω3‐PUFA‐containing food sources has been investigated, multiple environmental factors (e.g. climate change, human activities, pollution) will act in combination and any synergistic effects on aquatic food webs remain unclear. Identifying the sources and fate of ω3‐PUFAs within and across ecosystems could represent an important approach to understand the impact of multiple environmental factors on trophic relationships and the implications for populations of freshwater and riparian consumers. Maintaining the availability of high‐quality ω3‐PUFA‐containing food sources may also be key to mitigating freshwater biodiversity loss due to global change.

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Composition and indication of plankton fatty acids under the influence of environmental factors in the Hongfeng Reservoir, Southwest China

Wang

Wen-shen

et al. 2022

Aquat Ecol

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Effect of aquaculture on mercury and polyunsaturated fatty acids in fishes from reservoirs in Southwest China

Cited by 13 publications

References 52 publications

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

The importance of omega‐3 polyunsaturated fatty acids as high‐quality food in freshwater ecosystems with implications of global change

Composition and indication of plankton fatty acids under the influence of environmental factors in the Hongfeng Reservoir, Southwest China

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