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''Zostera'' is a small genus of widely distributed seagrasses, commonly called marine eelgrass or (outside North America) simply eelgrass. The genus ''Zostera'' contains 15 species. ==Ecology== ''Zostera marina'' is found on sandy substrates or in estuaries, usually submerged or partially floating. Most ''Zostera'' are perennial. They have long, bright green, ribbon-like leaves, the width of which are about . Short stems grow up from extensive, white branching rhizomes. The flowers are enclosed in the sheaths of the leaf bases; the fruits are bladdery and can float. ''Zostera'' beds are important for sediment deposition, substrate stabilization, as substrate for epiphytic algae and micro-invertebrates, and as nursery grounds for many species of economically important fish and shellfish. ''Zostera'' often forms beds in bay mud in the estuarine setting. It is an important food for brant geese and wigeons, and even (occasionally) caterpillars of the grass moth ''Dolicharthria punctalis''. The slime mold ''Labyrinthula zosterae'' can cause wasting disease of ''Zostera'', with ''Z. marina'' being particularly susceptible, causing a decrease in the populations of the fauna that depend on ''Zostera''. ''Zostera'' is able to maintain its turgor at a constant pressure in response to fluctuations in environmental osmolarity. It achieves this by losing solutes as the tide goes out and gaining solutes as the tide comes in. 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「zostera」の詳細全文を読む スポンサード リンク
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