造成大造成的河流碎片化的全球后果对双面体迁徙者:系统性审查和元分析
Jeffery C F Chan1,2, Billy Y K Lam2,3,4, David Dudgeon1
1School of Biological Sciences, The University of Hong Kong, Pok Fu Lam, Hong Kong.
概括
水严重影响着双眼鱼和甲类,阻碍了它们的迁移,鱼类通行证也无效. 拆除水对于恢复河流连接和保护迁徙物种更为有效.
科学领域:
- 淡水生态学 淡水生态
- 保护生物学 保护生物学
- 河流生态系统 河流生态系统
背景情况:
- 全球大的扩散大大改变了河流生态系统,威胁到淡水生物多样性.
- 由于依赖沿海-河流迁徙的二体物种,特别容易受到大引起的碎片化.
- 现有的关于大对大多数双眼动物的影响的知识仍然有限,尽管已知双眼动物物种的数量增加.
研究的目的:
- 综合水对二面体动物造成的河流碎片化的全球影响.
- 识别有关大对双眼鱼,十足鱼和足动物的影响的知识差距.
- 评估缓解策略的有效性,如鱼通过和水清除.
主要方法:
- 对65篇关于大对双面鱼和十足鱼的影响的精选出版物的系统审查和元分析.
- 研究将未碎片化/恢复的河流与碎片化河流进行了比较,分析了对丰富度,物种丰富度和遗传多样性的影响.
- 专注于三个关键主题:碎片化的影响,鱼通过的有效性和水清除潜力.
主要成果:
- 造成河流的碎片化,在所有评估的变量中对二面体鱼产生了负面影响.
- 鱼口没有显示出任何积极的结果;水拆除有效地恢复了鱼类的河流连接.
- 形十足动物容易受到息地变化的影响,但对屏障效应的敏感性低于鱼类;胃类动物是研究最少的.
结论:
- 清除水是恢复体物种息地连接的更有效的策略,而不是鱼道.
- 强制性和自主性双面体物种面临着重大威胁,特别是在丰富度和基因流动方面.
- 保护工作应优先考虑避免新的水建设和改善减缓,重点是研究不足的热带地区.
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