[口头报告]The sources and fate of omega-3 PUFA in eutrophic lakes

The sources and fate of omega-3 PUFA in eutrophic lakes
编号：1697 稿件编号：2719 访问权限：仅限参会人 更新：2024-04-11 17:38:32 浏览：422次 口头报告

报告开始：2024年05月19日 14:40 （Asia/Shanghai）

报告时间：10min

所在会议：[S4] 主题​4、生态与可持续发展 » [S4-9] 主题4、生态与可持续发展 专题4.4、专题4.2（19日下午，215）

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摘要
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
关键字
Food quality; Fish; Diatoms; Food webs; Fatty acids.
报告人
罗一多
硕士研究生 广东工业大学

稿件作者
郭芬 广东工业大学
罗一多 广东工业大学
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