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Caulerpa taxifolia
''Caulerpa taxifolia'' is a species of seaweed, an alga of the genus ''Caulerpa''. Native to the Indian Ocean, it is widely used ornamentally in aquariums, because it is considered attractive and neat in arrangement, and is easy to establish and care for, to the point of becoming a nuisance. The alga has a stem (rhizome) which spreads horizontally just above the seafloor, and from this stem grow vertical fern-like pinnae, whose blades are flat like yew (''Taxus''), hence the species name "taxifolia".
It is one of two algae on the list of the world's 100 worst invasive species compiled by the IUCN Invasive Species Specialist Group.
==Description==
Unlike most aquarium macro algae, ''C. taxifolia'' has the appearance of a vascular plant with "leaves" arranged neatly up stalks, like a fern. Behind this appearance, the plant is a typical macro alga, without the vascular system to transmit nutrients and cells that plants originally evolved on land have.
''Caulerpa taxifolia'' has been described as storing, in its "leaves" a single chemical, 'caulerpicin' that is noxious to fish and other would-be predators, though not toxic to the water around it. This is in contrast to plants which produce a variety of toxins, but in reduced amounts. On the other hand, studies have found that there is reduced pollution and toxicity in waters where it grows invasively, as around port cities in the Mediterranean. Original concerns about it reducing biodiversity of fauna have also been allayed, as species counts have shown it remains about the same.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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