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变暖和食用结构严格控制浮游植物的繁荣幅度,组成和顺序

Thomas Trombetta¹, Behzad Mostajir¹, Justine Courboulès¹

¹MARBEC (Marine Biodiversity, Exploitation and Conservation), Univ Montpellier, CNRS, Ifremer, IRD, Montpellier, France.

|October 4, 2024

概括

变暖的条件减少了植物浮游生物的开花规模,可能是由于动物浮游生物的放牧增加. 然而,在变暖下排除较大的动物浮游生物可以提高开花幅度,揭示影响春季植物浮游生物动态的复杂相互作用.

科学领域:

海洋生态海洋生态学
海洋学海洋学海洋学
气候变化科学气候变化科学

背景情况:

植物浮游生物的繁荣对海洋生态系统至关重要,对环境变化敏感.
预计气候变化会增加海洋温度,影响植物浮游生物的动态.
动物浮游生物的自上而下的控制在调节植物浮游生物种群方面发挥着重要作用.

研究的目的:

调查变暖对植物浮游生物开花的直接和间接影响.
评估动物浮游生物放牧 (自上而下的控制) 对植物浮游生物对变暖的反应的影响.
了解气候变暖和变化的动物浮游生物群落如何影响植物浮游生物的开花幅度,组成和继承.

主要方法:

在地中海沿岸的湖中进行了现场中宇宙实验.
应用了四种处理方法:环境温度,升高温度 (+3°C),环境温度与 mesozooplankton 排除,升高温度与 mesozooplankton 排除.
监测了叶绿素的度,浮游植物群体的组成和继承模式.

主要成果:

变暖显著降低了浮游植物的开花幅度 (叶绿素的度).
在变暖条件下中生浮游生物的排斥导致了花幅度的增加,这表明了变暖和动物浮游生物之间的复杂相互作用.
气候变暖和中生浮游生物排斥都改变了植物浮游生物的组成,使藻和小绿藻比藻和藻更受欢迎.
变暖改变了植物浮游生物的继承,促进了小绿色鞭毛虫的早期开花和藻的晚期开花.

结论:

植物浮游生物的开花对温度升高非常敏感,会影响它们的幅度,组成和顺序.
动物浮游生物群落结构对于调解植物浮游生物对变暖的反应至关重要,可能导致相反的开花动态.
未来更温暖的海洋条件可能有利于恐龙和小绿藻,对海洋食物网和能源转移产生重大影响.

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