Thysanoessa raschii

Thysanoessa raschii

Taxobox | name = "Thysanoessa raschii"
regnum = Animalia
phylum = Arthropoda
subphylum = Crustacea
classis = Malacostraca
ordo = Euphausiacea
familia = Euphausiidae
genus = "Thysanoessa"
species = "T. raschii"
binomial = "Thysanoessa raschii"
binomial_authority = M. Sars, 1864
synonyms ="Rhoda jardineana" Sim, 1872 "Euphausia raschii" G.O. Sars, 1883 "Boreophausia raschii" Norman, 1886 "Rhoda raschii" Stebbing, 1893

"Thysanoessa raschii", sometimes known as Arctic krill, is one of the most common euphausiid species of the subarctic and Arctic seas. They may reach 20–25 mm long, and are sexually mature above 14 mm [cite web |url=http://ip30.eti.uva.nl/bis/crustacea.php?menuentry=soorten&selected=beschrijving&id=13 |title=Macrobenthos of the North Sea |author=De Kluijver, M. J. & S. S. Ingalsuo] .

"T. raschii" is a major prey item of several taxa, including seabirds, planktivorous fishes and marine mammals. On St. Lawrence Island, Alaska, it is the primary constituent of the nestling diet of Crested Auklets ("Aethia cristatella"), making up about 66% of their diet by biomass between 2000 and 2004. It is also a common prey item of shearwaters [cite journal |author=Lovvorn, J. R., C. L. Baduini, & G. L. Hunt |year=2001 |title=Modelling underwater visual and filter feeding by plantivorous shearwaters in unusual sea conditions |journal=Ecology |volume=82 |issue=8 |pages=2342–2356 |url=http://www.esajournals.org/esaonline/?request=get-abstract&issn=0012-9658&volume=082&issue=08&page=2342 |doi=10.1890/0012-9658(2001)082 [2342:MUVAFF] 2.0.CO;2 |doilabel=10.1890/0012-9658(2001)082[2342:MUVAFF]2.0.CO;2] and several species of gull.

"T. raschii" goes through a number of stages in its development. Macdonald defined the characteristics of fourteen stages, or 'furcilia' [cite journal |quotes=no |author=Macdonald, R. |year=1928 |title=The life history of "Thysanoessa raschii" |journal=Journal of the Marine Biological Association of the United Kingdom |volume=15 |issue=1 |pages=57–80 |url=http://sabella.mba.ac.uk/571/] .

References


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