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{{Short description|Species of seaweed}}{{Speciesbox | image = Ladrona de ostras (Colpomenia peregrina), Parque natural de la Arrábida, Portugal, 2020-07-23, DD 15.jpg| genus = Colpomenia| species = peregrina| authority = Sauvageau}}Colpomenia peregrina, sometimes referred to by its vernacular names oyster thief and bladder weed,WEB,weblink Colpomenia peregrina Sauvageau, 2014-11-26, dead,weblink" title="archive.today/20141126202720weblink">weblink 2014-11-26, is a species of brown seaweed.This species is native to the Eastern Pacific Ocean, but has been introduced to other areas. It was first noticed in Europe in 1906 on oyster beds. It has now been recorded throughout the eastern north Atlantic, from NorwayPrintz, H. 1952. On some rare or recently immigrated marine algae on the Norwegian coast. Nytt Mag. Bot. 1: 135 - 151 and Sweden to Portugal.Minchin, A. 1991. Further distributiona; records of the adventive marine brown alga Colpomenia peregrina (Phaeophyta) in Ireland. Ir. Nat. J. 23:380 - 381 It was first recorded in Britain in 1908 and in Ireland in 1934.Morton, O. 2003. The marine macroalgae of County Donegal, Ireland. Bull. Ir. biogeog. Soc. 27: 3 - 164Lynn, M.J. 1935. Rare algae from Strangford Lough.- part II. Ir. Nat. J. 5: 275 - 283

Description

Colpomenia peregrina (syn. Colpomenia sinuosa (Mertens ex Roth) Derbès et Solier var. peregrina Sauvageau) is a small brown alga, bladder-like, hollow and membranous, up to 9 cm across. The surface is thin and smooth but often collapsed or torn when older. Olive brown in colour and attached by rhizoidal filaments to rock at the base.Fletcher, R.L. 1987. Seaweeds of the British Isles. Volume 3 Fucophyceae (Phaeophyceae) Part 1. British Museum (Natural History), London. {{ISBN|0-565-00992-3}}There are two species in Europe: C. sinuosa (Mert.) Derb. & Sol. and C. peregrina (Sauvageau) Hamel. C. sinuosa was present at least as far back as the 1840s in Spain, and C.peregrina was introduced and first noticed by oyster fishermen in the Bay of Biscay in 1906. It was first noticed in Britain in 1907 in Cornwall and Dorset.Jones, W.E. 1974. Changes in the seaweed flora of the British Isles. In Hawksworth, D.L. (Ed) The changing flora and flora of Britain. pp.97 - 113. Systematics Association Special Volume 6. Academic Press, London and New YorkThe two species are superficially similar and in older texts, such as Knight and Parke (1931),Knight, M. and Parke, M.W. 1931. Manx Algae. An algal survey of the south end of the Isle of Man. Proc. Trans. L'pool biol. Soc. 45(appendix II): 1 - 155. C.peregrina is referred to as C.sinuosa.Similar species: Leathesia difformis is a similar species: it is yellow brown in colour, fleshy and mucilaginous in texture. It is globose and smooth when young, becoming hollow and convoluted with age and growing to 5 cm in diameter. weblink However, L. difformis is easily distinguished from C. peregrina, because L. difformis readily squashes when pressed between finger and thumb.Hiscock, S. 1979. A field key to the British brown seaweeds (Phaeophyta). Field Studies. 3: 1 - 44

Habitat

This species is found in littoral rock pools, in localities that are not exposed, and also in the sublittoral to a depth of 3m.

Distribution

North America (west coast)

This species occurs from Alaska to La Jolla, in Southern California.

Europe

C. peregrina was first recorded in Europe in 1908.Minchin, D. 2001. Biodiversity and marine invaders. in Marine Biodiversity in Ireland and Adjacent Waters. (Appendix) Proceedings of a Conference 26–27 April 2001, Ulster Museum. publication no.8 It was also recorded from the Mediterranean.Abbott, I.A. and Hollenberg, G.J. 1976. Marine Algae of California. Stanford University Press, California. {{ISBN|0-8047-0867-3}}

British Isles

This seaweed is not native to the British Isles, but is found generally in this area. In Hardy and Guiry (2006) it is shown to be generally recorded around Ireland, south west England, Wales and the west coast of Scotland. Records from the east of Scotland are few, and it not shown as present on the east or south east coast of England.Hardy F.G. and Guiry, M.D. 2006. A Check-list and Atlas of the Seaweeds of Britain and Ireland. British Phycological Society. {{ISBN|3-906166-35-X}} It is noted as a recent addition to the flora (as C. sinuosa in Knight and Parke (1931).

Ireland

C. peregrina has been recorded in Ireland since 1934. Colpomenia peregrina has been recorded in Ireland from the following counties: Down,Morton, O. 1994.Marine Algae of Northern Ireland. Ulster Museum, Belfast. {{ISBN|0-900761-28-8}} Donegal, Kerry, Galway, Clare and Cork. Apparently this alga was first recorded in Ireland by M.J.Lynn from Strangford Lough in March 1934, and from Lough Larne near Ballycarry and Magheramorne in 1935. It was also recorded from Portballintrae, on the north coast, and in the south at Lough Ine. In 1936 it was found at Rush (County Dublin) and at Killough (County Down). There are further records from: Portstewart (County Londonderry), cast ashore at Hood's Ferry, Islandmagee (opposite Larne), (County Antrim).Blackler, H. 1937. The alga Colpomenia sinuosa Derb. et Sol. in Ireland. Ir. Nat. J.: 6:196 - 197 It is now abundant. Specimens of this species are stored in the Ulster Museum Herbarium (BEL) from: County Donegal in the Republic of Ireland; Northern Ireland and Wales under the catalogue museum numbers: F11254; F3136; F7675; F6154; F1682; F1693; F7491; F7674; F4254; F4254 and F1832.

New Zealand

C. peregrina is found in intertidal to subtidal zones of the coasts of the North and South Islands.BOOK, New Zealand seaweeds : an illustrated guide, Nelson, W. A., Te Papa Press, 2013, 9780987668813, Wellington, New Zealand, 120, 841897290,

References

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Further reading

• Blackler, H. 1939. The occurrence of Colpomenia sinuosa (Mert) Derb et Sol., in Ireland. Ir. Nat. J. 7: 215.
• Lund, Sren., 1945. On Colpomenia peregrinsa and its occurrence in Danish waters. Report of Danish Biological Station.

External links

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• AlgaeBase Site for more pictures and details
• weblink" title="archive.today/20110929015926weblink">The Seaweed Site for pictures and a description
• weblink" title="web.archive.org/web/20070704011243weblink">Department of the Environment: Zebra Mussel

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