articles de Dumontia contorta - Encyclopédie de la Vie

Brief Summary ( anglais )

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You don't expect seaweeds to flourish in the winter, but Dumontia contorta does. That is, it germinates in the autumn on stones and develops long thin fronds in late winter and early spring. It slowly perishes by the end of May. The only evidence you find of this seaweed in the summer is its base (the holdfast), attached to rocks. It is relatively common in tidal pools in the Wadden Sea and delta region. Its name contorta is related to the fact that the fronds are often twisted (contorted).

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Brief Summary ( néerlandais ; flamand )

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Rood darmwier kiemt in het najaar op stenen en schelpen. Het groeit in het voorjaar uit tot een opvallende plant. Na mei vergaat het weer langzaam. In de zomer blijft het hechtschijfje over. In de Waddenzee en in het deltagebied komt het vrij algemeen voor in getijdenpoelen.

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Dumontia contorta ( anglais )

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Dumontia contorta is a relatively small epiphytic algae of the sea-shore.

Description

The thallus grows from a discoid holdfast to a length of about 23 centimetres (9.1 in). The fronds branch irregularly and sparingly.^[2] The branches are hollow, soft and twisted, dark reddish brown in colour which bleach towards the tips, they clearly taper at their junction.^[1]

Reproduction

The plants are dioecious (sexes separate) with microscopic spermatangia, carposporangia, and tetrasporangia developing in the surface layer, cruciate.^[1]^[3]

Habitat

Generally epilithic in rock pools of the littoral zone.^[1]

Distribution

Common around the British Isles. Europe from Russia to Portugal and Canada to United States. In the NW Pacific and Alaska.^[1]^[4]

References

^ ^a ^b ^c ^d ^e Irvine, L.M. 1983. Seaweeds of the British Isles Volume 1 Rhodophyta. Part 2A. British Museum (Natural History) ISBN 0 565 00871 4
^ Jones, W.E. 1964. A key to the genera of the British seaweeds. Field Studies 1 no.4:1 - 32
^ Bunker,StP,P, Brodie, J.A., Maggs, C.A. and Bunker, A.R. 2017 Seaweeds of Britain and Ireland. Second Edition, Wild Nature Press, Plymouth, UK.ISBN 978-0-9955673-3-7
^ Morton, O. 2003. The marine macroalgae of County Donegal, Ireland. Bulletin of the Irish Biogeographical Society No. 27 pp.3 - 164

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Dumontia contorta: Brief Summary ( anglais )