连接营养丰富,息地结构和寄生虫与宿主-资源相互作用的途径
Rachel M Penczykowski1,2, Michelle L Fearon3, Jessica L Hite4,5
1School of Biology, Georgia Institute of Technology, Atlanta, GA, 30332, USA. rpenczykowski@wustl.edu.
Oecologia
|November 11, 2023
概括
人类的活动,如添加营养和改变息地,会影响水生食物网. 营养添加剂增加了寄生虫感染和宿主密度,改变了宿主资源动态.
科学领域:
- 生态生态学 生态生态学
- 水生生态系统 水生生态系统
- 食物网的动态 食物网的动态
背景情况:
- 人类活动,包括营养丰富和息地修改,显著改变水生生态系统.
- 这些变化可能会影响营养水平,息地结构和寄生,对食物网产生潜在的级联影响.
- 人们担心营养添加和息地变化可能会加剧疾病流行并影响宿主种群.
研究的目的:
- 研究营养水平,息地结构 (混合) 和寄生虫对动物浮游生物-真菌宿主-寄生虫系统的单独和联合影响.
- 解开这些因素之间的复杂关系及其对食物网动态的影响,特别是宿主-资源相互作用.
- 了解人类引起的生态系统变化如何相互作用,影响宿主-寄生虫动态和资源可用性.
主要方法:
- 在实验性全水柱围中利用了经过充分研究的动物浮游生物-真菌宿主-寄生虫系统.
- 工厂操纵的营养水平,息地结构 (混合) 和寄生虫的存在.
- 采用结构方程建模来分析连接营养的途径,混合,寄生,浮游植物的丰富性和宿主密度.
主要成果:
- 添加营养素显著增加了感染流行率,感染宿主的密度和总宿主密度.
- 在没有寄生虫的情况下,营养和混合增加了浮游生物的丰富性,宿主密度与浮游生物负相关 (自下而上和自上而下控制).
- 在寄生虫的存在下,营养物增加了浮游植物,但混合并没有,宿主密度与浮游植物脱,可能是由于生病宿主放牧减少.
结论:
- 一个人类活动的影响,比如息地结构的改变,可能取决于其他人类影响,比如寄生虫的引入.
- 营养丰富和寄生虫的存在相互作用,改变宿主-寄生虫动态和对初级生产者的控制 (植物).
- 精心设计的实验和分析对于理解人类对食物网的多方面的影响至关重要,包括宿主-寄生虫和宿主-资源的相互作用.
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