Presentation Details
The sources and fate of omega-3 PUFA in eutrophic lakes
ID：1697
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Updated Time：2024-04-11 17:38:32 Hits：1810
Oral Presentation
Start Time：2024-05-19 14:40（Asia/Shanghai）
Duration：10min
Session：S4 主题4、生态与可持续发展 »
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Abstract
- Omega-3 polyunsaturated fatty acids (ω3-PUFA) are central to growth and reproduction of aquatic consumers. Dissolved nutrients in aquatic ecosystems strongly affect the algal taxonomic composition and thus the production and transfer of specific ω3-PUFA to consumers at higher trophic levels. However, most studies have been conducted in nutrient-poor, oligotrophic lakes, leading to insufficiently comprehensive understanding of how water nutrients affect algal ω3-PUFA and their trophic transfer and subsequent retention in consumers of eutrophic lakes.
- We conducted a field study in a eutrophic lake and collected basal food sources (phytoplankton, periphyton and macrophytes) and aquatic consumers (invertebrates, zooplankton and fish), and measured their fatty acid (FA) composition.
- Our results showed that periphyton and phytoplankton were both important sources of ω3-PUFA for eutrophic lake food webs. High water nutrient levels coincided with low ω3-PUFA levels in phytoplankton and periphyton, resulting in decreased nutritional quality. Consequently, ω3-PUFA of invertebrates and zooplankton reflected variations in ω3-PUFA of phytoplankton and periphyton, respectively.
- The ω3-PUFA levels of fish decreased as phytoplankton and periphyton ω3-PUFA decreased. Among fishes, the Redfin Culter (Cultrichthys erythropterus) and Bar Cheek Goby (Rhinogobius giurinus) exhibited significantly higher levels of EPA and DHA compared to the Pond Loach (Misgurnus anguillicaudatus), which may have been caused by their different feeding modes.
- Decreases in the ω3-PUFA levels of basal food sources may be one of the causes leading to the reduction of trophic links in aquatic food webs.
- Our study elucidated the sources and fate of ω3-PUFAs in eutrophic lakes, complementing previous studies in oligo- and mesotrophic lakes, and emphasizes the role of high-quality food sources, offering new perspectives for the conservation and management of eutrophic lake ecosystems.
Keywords
Food quality; Fish; Diatoms; Food webs; Fatty acids.
Speaker
罗一多
硕士研究生 广东工业大学Submission Author
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Important Date
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Conference Date
May 17
2024
toMay 20
2024
-
Mar 31 2024
Draft paper submission deadline
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Mar 31 2024
Contribution Submission Deadline
-
May 20 2024
Registration deadline
Sponsored By
青年地学论坛理事会
Organized By
厦门大学近海海洋环境科学国家重点实验室
中国科学院城市环境研究所
自然资源部第三海洋研究所
中国科学院城市环境研究所
自然资源部第三海洋研究所
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