Fucus serratus explained

Fucus serratus is a seaweed of the north Atlantic Ocean, known as toothed wrack, serrated wrack,[1] or saw rack.[2] [3]

Description and reproduction

Fucus serratus is a robust alga, olive-brown in colour and similar to Fucus vesiculosus and Fucus spiralis. The Fucus serratus is one of many plants that are multicellular. It grows from a discoid holdfast up to 180cm (70inches) long. The fronds are flat, about 2cm (01inches) wide, bifurcating, and up to 1m (03feet) long including a short stipe. It branches irregularly and dichotomously. The flattened blade has a distinct midrib and is readily distinguished from related taxa by the serrated edge of the fronds. It does not have air vesicles, such as are found in F. vesiculosus, nor is it spirally twisted like F. spiralis. Male and female receptacles are on different plants.[4] The lamina shows cryptostomata – small cavities which produce colourless hairs.[5]

The reproductive bodies form in conceptacles sunken in receptacles towards the tips on the branches. In these conceptacles oogonia and antheridia are produced and after meiosis the oogonia and antheridia are released. Fertilisation follows and the zygote develops, settles and grows directly into the diploid sporophyte plant. The fertilization in the Fucus serratus would be associated with egg activation.

Distribution

Fucus serratus is found along the Atlantic coast of Europe from Svalbard to Portugal, in the Canary Islands and on the shores of north-east America.[6] [7] It was introduced to Iceland and the Faroe Islands by humans within the last 1000 years where it was first noted in a phycological survey in 1900.

Ecology

Fucus serratus grows very well on slow draining shores where it may occupy up to a third of the area of the entire seashore.[8] It often dominates the rocky parts of the lower shore, exposed or immersed in rock pools, on all but the most exposed shores.[9] "...the littoral zone is characterised especially by such Phaeophyta (brown algae) as Pelvetia, Ascophyllum, Egregia, Fucus and Laminaria, particularly when the shore is rocky".[10] [11]

Uses

Fucus serratus is used in Ireland and France for the production of cosmetics and for thalassotherapy. In the Western Isles of Scotland, it is harvested for use as a liquid fertiliser.[12] Since the organism contains tricacylglycerols and fatty acids.

Notes and References

  1. Book: 978-0-86033-046-2 . The Book of Seaweed . Alan P. Major . 1977 . Gordon Cremonesi.
  2. Book: David Chapman . Exploring the Cornish Coast . 2008 . Alison Hodge . . 9780906720561 . 26.
  3. Web site: Serrated wrack . . 15 March 2023.
  4. Book: L. Newton . 1931 . A Handbook of the British Seaweeds . British Museum . London.
  5. Book: C. I. Dickinson . 1963 . British Seaweeds . The Kew Series .
  6. Book: W. R. Taylor . 1972 . Marine Algae of the Northeastern Coast of North America . . 978-0-472-08840-9.
  7. Web site: Fucus serratus Linnaeus . . M. D. Guiry . Wendy Guiry . 2006.
  8. J. A. Coyer . G. Hoarau . M. Skage . W. T. Stam . J. L. Olsen . 2006 . Origin of Fucus serratus (Hereokontophyta; Fucaceae) populations in Iceland and the Faroes: a microsatellite-based assessment . . 41 . 2 . 235–246 . 10.1080/09670260600652820. 86489103 . free .
  9. Book: F. G. Hardy . M. D. Guiry . 2006 . A Check-list and Atlas of the Seaweeds of Britain and Ireland . British Phycological Society, London . 978-0-9527115-1-3 . 2007-06-27 . https://web.archive.org/web/20110725234101/http://seaweed.ucg.ie/check-list/check-list.pdf . 2011-07-25 . dead .
  10. Book: G. W. Prescott . The Algae: a Review . 1969 . Thomas Nelson & Sons . 301.
  11. Book: J. R. Lewis . 1964 . The Ecology of Rocky Shores . English Universities Press.
  12. Web site: Gavin Earons . Littoral Seaweed Resource Management . The Minch Project . . December 19, 2009.