Ramsar Convention on Wetlands. Cambridge University Press. In the United States, natural pools are often called ponds. A pond, therefore, may have combinations of three different food webs, one based on larger plants, one based upon decayed plants, and one based upon algae. The significance of this feature seems, in some cases, to have been lost when the word was carried abroad with emigrants. Naturally occurring vernal ponds do not usually have fish. Hence, introducing fish to a pond can have seriously detrimental consequences. In general, gently sloping shorelines with broad expanses of wetland plants not only provide the best conditions for wildlife, but they help protect water quality from sources in the surrounding landscapes.
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