食物网的热量控制调节了热带大西洋珊瑚礁生态系统对海洋热浪强度和持续时间的反应
Camila Artana1,2, Leonardo Capitani3,4,5, Gabriel Santos Garcia6
1Institute of Marine Science (ICM-CSIC), Barcelona, Spain.
The Journal of animal ecology
|May 25, 2024
概括
海洋热浪 (MHWs) 严重影响珊瑚礁生态系统. 上向控制会加剧生物质的损失,而自下而上的控制会提供一些缓解,突出显示食物网在人类大自然损失的弹性中的作用.
科学领域:
- 海洋生态海洋生态学
- 气候变化生物学 气候变化生物学
- 生态系统建模 生态系统建模
背景情况:
- 海洋热浪 (MHWs) 的频率和强度正在增加,在海洋生态系统中造成显著的热压力.
- 珊瑚礁特别脆弱,由于MHWs,珊瑚,无脊椎动物和鱼类的数量正在下降.
- 热应激和生物相互作用的综合影响,如热量控制,对整个珊瑚礁生态系统仍然未得到充分研究.
研究的目的:
- 调查海洋热浪特征和热带控制对珊瑚礁生态系统生物质的综合影响.
- 模拟海水温度,消耗率和物种生物质动态之间的机制联系.
- 评估不同的热量控制假设 (自上而下,混合,自下而上) 如何调节 MHW 对珊瑚礁生态系统的影响.
主要方法:
- 利用食物网建模方法来模拟物种的生物质动态.
- 整合了不同的海洋热浪特征 (强度,持续时间,频率) 作为热应激因素.
- 模拟物种的消费率作为不同热量控制场景下的海水温度的函数.
主要成果:
- 严重的MHW与自上而下的热带控制导致整个珊瑚礁生态系统生物量下降10%±5%.
- 底部向上的营养控制缓和生态系统生物量减少5% ± 5%.
- 顶级捕食者,中等捕食者和珊瑚经历了最实质性的生物质变化 (5%至20%±10%) 无论MHW或热带条件.
结论:
- 具有强大的自上而下的捕食者控制力的珊瑚礁生态系统在严重的MHW期间极易受到物种减少的影响.
- 食物网的热量控制是调节海洋热浪对生态影响的关键因素.
- 了解非生物压力因素 (MHWs) 和生物因素 (营养控制) 之间的相互作用对于预测珊瑚礁生态系统基线和未来状态至关重要.
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