更的尺寸光谱与不断减少的浮游植物生物量表明强烈的摄取物放大和未来的鱼类减少
Angus Atkinson1, Axel G Rossberg2, Ursula Gaedke3
1Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL13DH, UK. aat@pml.ac.uk.
Nature communications
|January 9, 2024
概括
气候变化对植物浮游生物质的影响放大,以显著减少鱼群. 这项研究使用尺寸光谱来经验验证这些热量放大,揭示食物网的漏洞.
科学领域:
- 海洋生态海洋生态学
- 气候变化科学 气候变化科学
- 渔业科学 渔业科学
背景情况:
- 气候变化模型预测,由于植物浮游生物质减少,较高的食物营养水平会大幅下降.
- 这些模型预测的验证具有挑战性,需要替代的经验方法.
- 在气候压力下,了解海洋食物网的能量转移效率对于渔业和碳循环至关重要.
研究的目的:
- 用实地尺寸光谱来经验验证气候变化对海洋食物网的影响的热带放大.
- 在多种气候压力因素下,量化通过鱼类食物网的能量转移的净效率.
- 调查驱动食用放大机制,区分直接热效应和自下而上的食物网结构.
主要方法:
- 从现场数据中编制和分析全球鱼体型谱斜率.
- 在小型和大型生物之间比较生物质,以评估能量转移效率.
- 统计分析以确定食物网结构和热量放大的驱动因素.
主要成果:
- 来自鱼大小光谱的实证数据证实了 trofhic 放大,独立于模型模拟.
- 植物浮游生物量减少16%可能导致鱼类生物量减少38%在中度海洋.
- 热量放大主要是由对植物浮游生物的温度和营养控制驱动的,而不是对消费者的直接热效应.
结论:
- 现场尺寸光谱提供了一种可靠的方法来验证气候变化对海洋食物网的影响.
- 观察到的热带放大凸显了渔业生产率和海洋碳储存的重大风险.
- 这些发现挑战了关于直接热效应的传统观点,强调了气候变化反应中自下而上的食物网动态的重要性.
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