海洋桡足类在多代暴露于沿海变暖和环境现实浓度的汞下的生理和分子反应,Environmental Science & Technology Letters

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海洋桡足类在多代暴露于沿海变暖和环境现实浓度的汞下的生理和分子反应
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2023-02-17 , DOI: 10.1021/acs.estlett.3c00010
Zhuoan Bai ₁ , Nan Wang ₁ , Min-Sub Kim ₂ , Young Hwan Lee ₂ , Jae-Seong Lee ₂ , Da-Zhi Wang ₁ , Minghua Wang ₁

Affiliation

在这项工作中，我们研究了较高的温度 (26 °C) 和汞污染 (1 μg/L) 如何影响海洋桡足类Tigriopus japonicus跨越三代 (F0–F2)。对每一代的几个表型特征和汞积累进行了测量，并对 F2 桡足类的蛋白质组进行了分析。结果表明，较高的温度和汞暴露显着影响表型性状。联合暴露显着增加了汞的生物蓄积，因此相对于单独的汞处理而言，每一代都增强了汞的毒性。蛋白质组学分析表明，温度升高导致桡足类动物上调成年寿命途径的决定，以维持快速生长，但以生物体的适应性为代价，例如性别比例偏雄和繁殖受损。汞污染有多种毒性作用，例如，能量耗尽和防御能力下降，最终转化为繁殖减少。重要的是，温度升高加剧了汞毒性，主要是通过扰乱能量代谢和损害解毒系统，这与抑制摄食和繁殖有关日本对虾。我们的研究提供了对T. japonicus对沿海变暖和汞污染的反应的机制，多代理解，重点是在温暖条件下海洋桡足类动物的汞毒性增强。

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Physiological and Molecular Responses of a Marine Copepod Under Multigenerational Exposure to Coastal Warming and Mercury at an Environmentally Realistic Concentration

In this work, we investigated how a warmer temperature (26 °C) and mercury pollution (1 μg/L) affect the marine copepod Tigriopus japonicus across three generations (F0–F2). Several phenotypic traits and mercury accumulation were measured in each generation, and the proteome of the F2 copepods was analyzed. The results show that a warmer temperature and mercury exposure significantly affected the phenotypic traits. Combined exposure significantly increased mercury bioaccumulation and consequently potentiated its toxicity in each generation relative to mercury treatment alone. The proteomic analysis demonstrated that the warmer temperature caused the copepods to upregulate the determination of adult lifespan pathway to maintain rapid growth but at the cost of an organism’s fitness, as exemplified by the male-biased sex ratio and compromised reproduction. Mercury pollution had several toxic effects, e.g., energy depletion and reduced defense performance, that ultimately translated to decreased reproduction. Importantly, the warmer temperature aggravated mercury toxicity, mainly by disturbing energy metabolism and impairing detoxification systems, which were linked to depressed feeding and reproduction in T. japonicus. Our study provides a mechanistic, multigenerational understanding of the response of T. japonicus to coastal warming and mercury pollution, with emphasis on enhanced mercury toxicity in marine copepods under warmer conditions.

更新日期：2023-02-17

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