经验证据表明,河口中存在替代性的稳定状态
S Cronin-O'Reilly1, K N Krispyn1, C Maus1
1Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, Murdoch, Western Australia 6150, Australia.
The Science of the total environment
|September 19, 2024
概括
河口可以在不同的生态状态之间转移,这是由于长时间的关闭和高盐度所导致的. 这项研究证实了临时开放/关闭河口的替代稳定状态,盐度是关键因素.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 海洋生物学 海洋生物学
背景情况:
- 由于人类活动,生态系统越来越多地超过了生态值,导致它们转移到不受欢迎的替代稳定状态.
- 河口存在多个稳定状态,特别是临时开放和封闭系统的存在仍然不确定.
- 了解这些变化对于在环境变化下管理河口生态系统至关重要.
研究的目的:
- 调查河口是否可以在多个稳定的状态下存在.
- 为了测试暂时关闭的澳大利亚河口的无脊椎动物群体中的替代稳定状态.
- 确定与河口生态系统的政权转变相关的驱动因素和值.
主要方法:
- 在澳大利亚河口对无脊椎动物群体进行了为期3.5年的研究.
- 由于河口关闭,在1.5年的超度 (>40 ppt,达到122 ppt) 期间采样.
- 在河口向海洋开放期间和之后 (美索哈林条件,5-19 ppt) 采样了两年.
主要成果:
- 在沙破裂之前和之后观察到两种不同的无脊椎动物社区状态.
- 在关闭期间记录了社区的贫困,以陆地昆虫幼虫为主 (例如,Tanytarsus barbitarsis).
- 开放后记录了无脊椎动物的丰富性和丰富性增加,有多胞体,软体动物和甲类动物的殖民,尽管恢复不完整.
结论:
- 暂时开放和关闭的河口可以存在于其他稳定的状态,长时间的关闭和高盐度是关键决定因素.
- 这些状态之间似乎存在大约60-65 ppt的盐度值.
- 研究结果表明,政权转变是由外源事件引发的,例如沙破裂,并且可能随着气候变化而变得更频繁.
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