淡水生态系统，是指在淡水中由生物群落及其环境相互作用所构成的自然系统。淡水生态系统分为静水的和流动水的两种类型。前者指淡水湖泊、沼泽、池塘和水库等；后者指河流、溪流和水渠等。淡水生态系统具有易被破坏、难以恢复的特征。
这是因为淡水生态系统和人类活动密切相关。
That's because freshwater ecosystems are so closely linked to human activity.
与合作伙伴共同努力，恢复了17个湖泊与长江的连通，令长江中游的淡水生态系统重现生机。
WWF and our partners have facilitated the reconnection of 17 lakes to the Yangtze River, infusing new life to its fragile freshwater ecosystem.
所有这些淡水生态系统可以在一个分水岭中被发现—那是一套可以把比如大湖泊或者海洋这样单一的水域排干的栖息地。
All the freshwater ecosystems can be found within a watershed-a set of habitats that drain into a single body of water such as a big lake or the ocean.
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