风干扰驱动新热带山脉溪流食物网的热带变化
Pablo E Gutiérrez-Fonseca1, Catherine M Pringle2, Alonso Ramírez3
1Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, Vermont, USA.
Ecology
|November 5, 2023
概括
波多黎各的风使热带河流的食物网从依赖外部有机物转向内部藻类生产. 这种变化简化了食物网结构,影响了这些重要生态系统中的能量流.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候变化影响 气候变化影响
背景情况:
- 森林溪流的食物网传统上依赖于外部有机物质 (异性碳).
- 森林中有限的光线透限制了内部初级生产 (本土碳).
- 极端气候干扰可能会破坏生态系统动态和食物网结构.
研究的目的:
- 量化两个主要风 (伊尔玛和玛丽亚) 对热带森林河流食物网的影响.
- 评估风扰乱后基础资源,消费者和食物网结构的变化.
- 了解极端天气事件后碳源驱动流食物网的转变.
主要方法:
- 在热带河流中收集的生态系统和食物网数据 6个月前和后风 (2,9,18个月).
- 监控的结构 (天花板) 和水文 (排放) 特性.
- 使用稳定同位素分析 (C和N) 分析了基底资源 (藻类,生物膜,叶子垃圾) 和消费者 (无脊椎动物,沿海物种).
主要成果:
- 风增加了树冠的开放性,导致初级生产增加.
- 河流食物网在两个月内从原住民碳来源转向土著碳来源.
- 食物网变得越来越短,越来越狭窄,风后的食物种数量增加.
结论:
- 风干扰从根本上改变了热带河流的食物网,改变了热带基础.
- 树冠覆盖和资源可用性的变化推动了这些重大的生态变化.
- 这些发现对于了解河流生态系统在面对气候变化带来的干扰日益增加时的弹性至关重要.
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