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Spatio-temporal variations in the trophic status of Lake Naivasha, Kenya

机译：肯尼亚奈瓦沙湖营养状况的时空变化

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摘要

The spatio-temporal dynamics of the trophic state of a lake are crucial in defining its water quality, as well as biodiversity. Accordingly, this study focused on the spatio-temporal variations of the trophic state, and the possible causes of the heterogeneous turbidity in Lake Naivasha, Kenya. The trophic state of the lake oscillated between a eutrophic and hypereu-trophic condition, being found to be more eutrophic than reported in previous studies, indicating a progressive deterioration of its water quality. Inferences from the graphical representation of the deviations of total phosphorus and Secchi depth from the chlorophyll-α trophic state indices revealed that the lake is predominantly phosphorus limited. Furthermore, the turbidity in the northern part of the lake is dominated by suspended sediment and dissolved coloured material. Discriminant analysis resulted in identification of three distinct trophic state regions in Lake Naivasha, namely the northern region, the mid and southern part and the more or less isolated Crescent Lake. The results of this study provide a good basis for further investigation of the current loading magnitude of both nutrients and sediments, in order to facilitate sustainable management to ensure community integrity and ecosystem functions of the lake.
机译：湖泊营养状态的时空动态对于确定其水质和生物多样性至关重要。因此，本研究着眼于营养状态的时空变化以及肯尼亚奈瓦夏湖非均质混浊的可能原因。湖泊的营养状态在富营养和高营养状态之间振荡，被发现比以前的研究报告更富营养，表明其水质逐渐恶化。从总磷和Secchi深度与叶绿素-α营养状态指数的偏差的图形表示中推断，该湖泊主要受磷限制。此外，湖泊北部的浊度以悬浮的沉积物和溶解的有色物质为主。判别分析确定了奈瓦沙湖的三个不同的营养状态区域，即北部区域，中部和南部以及或多或少孤立的新月湖。这项研究的结果为进一步调查目前养分和沉积物的负荷量提供了良好的基础，以便促进可持续管理以确保湖泊的完整性和生态系统功能。

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