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salp
A salp (plural salps) or salpa (plural salpae or salpas〔(【引用サイトリンク】title=salp - Definitions from Dictionary.com ); Peter Forsskål, in introducing the genus ''Salpa'' from waters off Yemen (1763, publication 1775), gave no derivation for his word; the English ''salp'' first appeared in 1835 (''OED'', "salp)〕) is a barrel-shaped, planktonic tunicate. It moves by contracting, thus pumping water through its gelatinous body. Salp jet propulsion is one of the most efficient in the animal kingdom.〔(Jet propulsion in salps (Tunicata: Thaliacea) )〕 The salp strains the pumped water through its internal feeding filters, feeding on phytoplankton.
==Distribution==
Salps are common in equatorial, temperate, and cold seas, where they can be seen at the surface, singly or in long, stringy colonies. The most abundant concentrations of salps are in the Southern Ocean (near Antarctica), where they sometimes form enormous swarms, often in deep water, and are sometimes even more abundant than krill.〔(【引用サイトリンク】title=Dive and Discover: Scientific Expedition 10: Antarctica )〕 Since 1910, while krill populations in the Southern Ocean have declined, salp populations appear to be increasing. Salps have been seen in increasing numbers along the coast of Washington.
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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