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This article gives an overview of the aquatic communities in the British National Vegetation Classification system. ==Introduction== The aquatic communities of the NVC were described in Volume 4 of ''British Plant Communities'', first published in 1995, along with the swamps and tall-herb fens. In total, 24 aquatic communities have been identified. The aquatic communities fall into the following six groups: * four communities of the water surface and sub-surface, in which duckweeds and/or Frogbit are the constant species; these communities (A1, A2, A3 and A4) are found in moderately-rich to eutrophic standing waters * eight free-floating or rooted and submerged, pondweed communities (A5, A6, A11, A12, A13, A14, A15 and A21) * six communities in which rooted water-lilies and pondweeds with floating leaves are the constant species (A7, A8, A9, A10, A19 and A20) * three communities in which water-crowfoots and/or starworts are the constant species (A16, A17 and A18) * two hairgrass and quillwort communities (A22 and A23) * a single community characterised by free-floating vegetation found in impoverished base-poor standing waters (A24). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aquatic communities in the British National Vegetation Classification system」の詳細全文を読む スポンサード リンク
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