记录植物浮游生物群落对水文重置事件的反应,这些事件发生在低流量环保性河口的低流量河口
Emily C de Beer1, Janine B Adams1, Daniel A Lemley1
1Botany Department, Nelson Mandela University, Gqeberha, 6031, South Africa; DSI/NRF Research Chair in Shallow Water Ecosystems and the Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha, 6031, South Africa.
Marine environmental research
|July 29, 2025
概括
来自大雨的淡水脉冲可以引发有害的藻类繁殖 (HAB),如南非河口的Heterosigma akashiwo. 管理必须将水文恢复与营养减少相结合,以控制未来的HABs.
科学领域:
- 河口生态学 河口生态学
- 有害藻类繁殖 (HAB) 的动态
- 南非水生生态系统 南非水生生态系统
背景情况:
- 在南非南部海岸的两个永久性环保,低流量河口经历了干旱,随后是大雨.
- 有害藻类繁殖 (HABs),特别是Heterosigma akashiwo,是这些河口中经常出现的问题,原因是农业排水和废水处理厂的营养丰富.
研究的目的:
- 为了研究一个重要的淡水脉冲事件对河口植物浮游生物群落的影响.
- 为了记录有害藻类繁殖 (HABs) 的动态,特别是 Heterosigma akashiwo,在干旱和随后的降雨之后.
- 为未来的管理策略提供信息,以减轻这些敏感的河口系统中的HAB.
主要方法:
- 从2023年11月到2024年3月,每月抽取无生物和浮游植物参数的样本.
- 监测Heterosigma akashiwo在Swartkops和Sundays河口的存在和丰度.
- 分析水文事件 (干旱,降雨,淡水脉冲) 与HAB发生之间的关系.
主要成果:
- 在淡水脉冲4个月和5个月后,Heterosigma akashiwo分别在Sundays河口和Swartkops河口重新出现.
- 阿卡希沃 (H. akashiwo) 返回星期日河口的速度比预期的要快,尽管先前的淡水占主导地位.
- 来自农业回流和废水处理工程的营养丰富有助于这些河口的HAB发展.
结论:
- 单独的淡水豆类不足以从这些河口中长期清除Heterosigma akashiwo.
- 有效管理HAB需要综合战略,解决水文恢复和营养减少问题.
- 未来的管理必须考虑水文和营养负载之间的复杂相互作用.
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