| Tunicate, Pyrosome, Thaliacea, Ascidians, Larvacea|
A salp (plural salps) or salpa (plural salpae or salpas) 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. The salp strains the pumped water through its internal feeding filters, feeding on phytoplankton.
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. 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.
Salps have a complex lifecycle, with an obligatory alternation of generations. Both portions of the lifecycle exist together in the seas—they look quite different, but both are mostly transparent, tubular, gelatinous animals that are typically between 1 and 10 cm (0.39 and 3.94 in) tall. The solitary life history phase, also known as an oozoid, is a single, barrel-shaped animal that reproduces asexually by producing a chain of tens to hundreds of individuals, which are released from the parent at a small size.
The chain of salps is the 'aggregate' portion of the lifecycle. The aggregate individuals are also known as blastozooids; they remain attached together while swimming and feeding, and each individual grows in size. Each blastozooid in the chain reproduces sexually (the blastozooids are sequential hermaphrodites, first maturing as females, and are fertilized by male gametes produced by older chains), with a growing embryo oozoid attached to the body wall of the parent. The growing oozoids are eventually released from the parent blastozooids, and then continue to feed and grow as the solitary asexual phase, thus closing the lifecycle of salps.
The alternation of generations allows for a fast generation time, with both solitary individuals and aggregate chains living and feeding together in the sea. When phytoplankton is abundant, this rapid reproduction leads to fairly short-lived blooms of salps, which eventually filter out most of the phytoplankton. The bloom ends when enough food is no longer available to sustain the enormous population of salps. Occasionally, mushroom corals and those of the genera Heteropsammia are known to feed on salps during blooms
The incursion of a large number of salps (Salpa fusiformis) into the North Sea in 1920 led to a failure of the herring fishing.
One reason for the success of salps is how they respond to phytoplankton blooms. When food is plentiful, salps can quickly bud off clones, which graze the phytoplankton and can grow at a rate which is probably faster than that of any other multicellular animal, quickly stripping the phytoplankton from the sea. But if the phytoplankton is too dense, the salps can clog and sink to the bottom. During these blooms, beaches can become slimy with mats of salp bodies, and other planktonic species can experience fluctuations in their numbers due to competition with the salps.
Sinking fecal pellets and bodies of salps carry carbon to the sea floor, and salps are abundant enough to have an effect on the ocean's biological pump. Consequently, large changes in their abundance or distribution may alter the ocean's carbon cycle, and potentially play a role in climate change.
Salps are closely related to the pelagic tunicate groups Doliolida and Pyrosoma, as well as to other bottom-living (benthic) tunicates.
Although salps appear similar to jellyfish because of their simple body form and planktonic behavior, they are chordates: animals with dorsal nerve cords, related to vertebrates, animals with backbones.
Salps appear to have a form preliminary to vertebrates, and are used as a starting point in models of how vertebrates evolved. Scientists speculate that the tiny groups of nerves in salps are one of the first instances of a primitive nervous system, which eventually evolved into the more complex central nervous systems of vertebrates.
The World Register of Marine Species lists the following genera and species in the order Salpida:Order Salpida
Genus Brooksia Metcalf, 1918 Brooksia berneri van Soest, 1975
Brooksia rostrata (Traustedt, 1893)
Genus Cyclosalpa de Blainville, 1827Cyclosalpa affinis (Chamisso, 1819)
Cyclosalpa bakeri Ritter, 1905
Cyclosalpa foxtoni Van Soest, 1974
Cyclosalpa ihlei van Soest, 1974
Cyclosalpa pinnata (Forskål, 1775)
Cyclosalpa polae Sigl, 1912
Cyclosalpa quadriluminis Berner, 1955
Cyclosalpa sewelli Metcalf, 1927
Cyclosalpa strongylenteron Berner, 1955
Genus Helicosalpa Todaro, 1902Helicosalpa komaii (Ihle & Ihle-Landenberg, 1936)
Helicosalpa virgula (Vogt, 1854)
Helicosalpa younti Kashkina, 1973
Genus Ihlea Metcalf, 1919Ihlea magalhanica (Apstein, 1894)
Ihlea punctata (Forskål, 1775)
Ihlea racovitzai (van Beneden & Selys Longchamp, 1913)
Genus MetcalfinaMetcalfina hexagona (Quoy & Gaimard, 1824)
Genus Pegea Savigny, 1816Pegea bicaudata (Quoy & Gaimard, 1826)
Pegea confederata (Forsskål, 1775)
Genus Ritteriella Metcalf, 1919Ritteriella amboinensis (Apstein, 1904)
Ritteriella picteti (Apstein, 1904)
Ritteriella retracta (Ritter, 1906)
Genus Salpa Forskål, 1775Salpa aspera Chamisso, 1819
Salpa fusiformis Cuvier, 1804
Salpa gerlachei Foxton, 1961
Salpa maxima Forskål, 1775
Salpa thompsoni (Foxton, 1961)
Salpa tuberculata Metcalf, 1918
Salpa younti van Soest, 1973
Genus Soestia (also accepted as Iasis)Soestia cylindrica (Cuvier, 1804)
Soestia zonaria (Pallas, 1774)
Genus ThaliaThalia cicar van Soest, 1973
Thalia democratica (Forskål, 1775)
Thalia longicauda (Quoy & Gaimard, 1824)
Thalia orientalis Tokioka, 1937
Thalia rhinoceros van Soest, 1975
Thalia rhomboides (Quoy & Gaimard, 1824)
Thalia sibogae van Soest, 1973
Genus Thetys Tilesius, 1802Thetys vagina Tilesius, 1802
Genus Traustedtia Traustedtia multitentaculata (Quoy & Gaimard, 1834)
Genus Weelia Yount, 1954Weelia cylindrica (Cuvier, 1804)