Durvillaea antarctica

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Durvillaea antarctica
Durvillea antarctica

Durvillea antarctica

Systematics
without rank: Stramenopiles (stramenopiles)
without rank: Brown algae (Phaeophyceae)
without rank: Fucales
Family : Durvillaeaceae
Genre : Durvillaea
Type : Durvillaea antarctica
Scientific name
Durvillaea antarctica
( Chamisso ) Hariot

Durvillea antarctica , even Cochayuyo or Bull Kelp called, is a large Seetangart of brown algae from the sub-Antarctic coastal area. It reaches a length of up to 10 meters. The species name D. antarctica is misleading as it does not occur in the Antarctic region. The genus was named in honor of Jules Dumont d'Urville . The alga is usedas a staple foodin Chile and is known here as cochayuyo.

features

The Durvillea antarctica is a resilient large alga with a strong cauloid (stem). The rhizoid (root) is also well developed and has enormous adhesion. The phylloid (the leaf-like organ of the alga) is narrow and ribbon-shaped. In the phylloid there are air chambers that resemble honeycombs. This and the massive adhesive organ gives the alga an enormous resistance to strong waves and surf . When the alga is torn from the substrate, the air chambers also promote the transport of the alga through buoyancy. The species is therefore probably more widespread in the southern hemisphere than the other species of its genus, whose phylloids do not contain air chambers.

The honeycomb-like structure within the leaf

The growth takes place diffusely and not, as with other representatives of the order Fucales , through a crown cell .

Reproduction

Like all species of the genus, Durvillaea antarctica has a diplontic life cycle without a generation change . Immobile egg cells and mobile spermatozoids are formed through meiosis ( oogamy ). The spermatozoids are flagellated heterocontactly and are attracted to the egg cells by the pheromone hormone siren . After fertilization, a diploid alga is formed again immediately.

The pheromomone hormone siren

distribution

The distribution extends north of 29 ° S in Chile over the sub-Antarctic islands to New Zealand .

Individual evidence

  1. ^ A b Sharon R. Chester: A Wildlife Guide to Chile: Continental Chile, Chilean Antarctica, Easter Island, Juan Fernandez Archipelago . Princeton Univ Pr, 2008, ISBN 978-0-691-12976-1 .
  2. ↑ Wolfram Braune: Marine algae. A color guide to the common benthic green, brown and red algae of the world's oceans . Gantner Verlag, 2008, ISBN 978-3-906166-69-8 .
  3. ↑ a b c Klaus Lüning: Marine botany - distribution, ecophysiology and use of marine macroalgae. Georg Thieme Verlag, 1995, ISBN 978-3-13-667501-4 .
  4. ↑ Christiaan van den Hoek, David Mann and M. Jahns: Algae. An Introduction to Phycology . Cambridge University Press, 1995. ISBN 9780521316873
  5. ↑ JMB Smith, T. Bayliss-Smith (1998) Kelp-plucking: coastal erosion facilitated by bull-kelp Durvillaea antarctica at subantarctic Macquarie Island. In: Antarctic Science. 10 (1998), pp. 431-438.

literature

  • Klaus Lüning: Marine botany - distribution, ecophysiology and use of marine macroalgae. Georg Thieme Verlag, Stuttgart 1985, ISBN 978-3-13-667501-4 .
  • Wolfram Braune: marine algae. A color guide to the common benthic green, brown and red algae of the world's oceans. Gantner, Ruggell 2008, ISBN 978-3-906166-69-8 , pp. 196-197.

Web links

Commons : Durvillaea antarctica  - collection of images, videos and audio files