堤建设和营养丰富导致了河流微型食物网的简化,通过削弱自上而下的控制效应
Ge Cui1, Juan Chen1, Chao Wang1
1Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, PR China.
Journal of environmental management
|November 30, 2025
概括
河流生态系统面临水和营养污染的威胁. 综合干扰大大简化了微型食物网,削弱了捕食者控制,影响了河流的健康.
科学领域:
- 河流生态 河流生态
- 微生物生态学 微生物生态学
- 生态系统动态生态系统动态
背景情况:
- 河流生态系统受到水建设和营养丰富的威胁.
- 这些干扰对河流微型食物网的影响尚不清楚.
- 了解这些影响对于评估河流健康和生态功能至关重要.
研究的目的:
- 调查多型微生物群体和微型食物网对金沙河水建设和营养丰富的反应.
- 在不同的干扰条件下分析alpha和beta多样性和微型食物网结构的变化.
- 构建一个超级食物网络,将经验捕食者-猎物数据与DNA测序集成在一起.
主要方法:
- 从金沙河的28个地点收集了84个水样,按大干预和营养丰富水平分类.
- 使用高通量测序来识别细菌,藻类,真菌和原生动物.
- 使用DNA数据和已知的捕食者-猎物关系构建了一个超级食物网,以评估微型食物网的特征.
主要成果:
- 堤建设和营养丰富显著改变了微生物群体的分布模式.
- 综合干扰使微食物网的复杂性平均降低了21.54%,而单一干扰则降低了5.80%.
- 这些干扰通过削弱原生动物施加的自上而下的控制来简化微型食物网,在结合时显示出协同效应.
结论:
- 堤建设和营养丰富是河流生态系统中微型食物网简化的关键驱动力.
- 这些干扰的综合效应是协同作用的,导致更明显的简化.
- 这项研究提供了对面临多种人为压力因素的河流生态健康的见解.
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