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Knotted Wrack

Ascophyllum nodosum

Summary 7

Ascophyllum nodosum is a large, common brown alga (Phaeophyceae) in the family Fucaceae, being the only species in the genus Ascophyllum. It is seaweed of the northern Atlantic Ocean, also known as feamainn bhuí, rockweed, Norwegian kelp, knotted kelp, knotted wrack or egg wrack. It is common on the north-western coast of Europe (from Svalbard to Portugal) including east Greenland and the north-eastern coast of North America.

Ascophyllum 8

Ascophyllum nodosum is a large, common cold water seaweed or brown alga (Phaeophyceae) in the familyFucaceae, being the only species in the genusAscophyllum. It is a seaweed that only grows in the northern Atlantic Ocean, also known in localities as feamainn bhuí, rockweed, Norwegian kelp, knotted kelp, knotted wrack or egg wrack. It is common on the north-western coast of Europe (from Svalbard to Portugal) including east Greenland[1] and the north-eastern coast of North America, it's range further south of these latitudes being limited by warmer ocean waters.[2]

Description

A. nodosum has long tough and leathery fronds,[3] irregularly dichotomously branched [4]fronds with large, egg-shaped air bladders set in series at regular intervals along the fronds and not stalked. The fronds can reach 2 m in length and are attached by a holdfast to rocks and boulders. The fronds are olive-green,[5] olive-brown in color and somewhat compressed, but without a midrib.[6]

Reproduction

Its life history is of one diploid plant and gametes. Each individual plant is either male or female.[3] The gametes are produced in the spring[3] in conceptacles embedded in yellowish receptacles on short branches.[2][7]

Varieties and forms

Several different varieties and forms of this species have been described.

Free-floating forms of this species are found in, for example, A. n. mackaii Cotton, which is found at very sheltered locations, such as at the heads of sea lochs in Scotland and Ireland.[9][10]

Ecology

A. nodosum is found mostly on sheltered sites on shores in the midlittoral, where it can become the dominant species in the littoral zone.[11][12]

The species is found in a range of coastal habitats from sheltered estuaries to moderately exposed coasts, and often it dominates the intertidal zone (although subtidal populations are known to exist in very clear waters). However, it is rarely found on exposed shores, and if it is found, the fronds are usually small and badly scratched. This seaweed grows quite slowly, 0.5% per day, carrying capacity is about 40 kg wet weight per square meter, and it may live for 10–15 years. It may typically overlap in distribution with Fucus vesiculosus and Fucus serratus. Its distribution is also limited by salinity, wave exposure, temperature, desiccation, and general stress.[13][14][15] It may take approximately five years before becoming fertile.

Phlorotannins in A. nodosum act as chemical defenses against the marine herbivorous snail, Littorina littorea.[16]Polysiphonia lanosa (L.) T.A. Christensen is a small red alga, commonly found growing in dense tufts on Ascophyllum whose rhizoids penetrate the host.[17] It is considered by some as parasitic; however, as it only receives structural support from knotted wrack (not parasitically), it acts as an epiphyte.

Distribution

This species has been recorded in Europe from Ireland, the Faroe Islands,[18]Norway,[19]Britain and Isle of Man,[20]Netherlands,[21] and North America from the Bay of Fundy, Nova Scotia, Baffin Island, Hudson Strait, Labrador, and Newfoundland.[1][2] It has been recorded as an accidental introduction near San Francisco, California, and eradicated as a potential invasive species.[22]

Uses

A. nodosum is harvested for use in alginates, fertilisers, and the manufacture of seaweed meal for animal and human consumption.[23] It has long been used as an organic and mainstream fertilizer for many varieties of crops due to its combination of both macronutrients, (N, P, and K) and micronutrients (Ca, Mg, S, Mn, Cu, Fe, Zn, etc.). It also contains cytokinins, auxin-like gibberellins, betaines, mannitol, organic acids, polysaccharides, amino acids, and proteins which are all very beneficial and widely used in agriculture.[24] Ireland, Scotland and Norway have provided the world's principal alginate supply.[25][26]A. nodosum is frequently used as packaging material for baitworm and lobster shipments from New England to various domestic and international locations.[27]Ascophyllum itself has occasionally been introduced to California, and several species frequently found in baitworm shipments, including Carcinus maenas and Littorina saxatilis, may have been introduced to the San Francisco Bay region this way.[27]

Toxicological uses

Because the age of the different parts of A. nodosum can be identified by its shoots, it has also been used to monitor concentrations of heavy metals in seawater. A concentration factor for zinc has been reported to be of the order 104.[28][29]

Chemistry

A. nodosum contains the phlorotannins tetraphlorethol C and tetrafucol A.[30]

Harvesting controversy

Controversy exists over impacts of commercial harvesting of A. nodosum for use in garden or crop fertilizers and livestock feed supplements in North America and Europe. Some research has been focused on bycatch and impact on intertidal zone communities. [31] Opponents of its wild harvest point to the algae's high habitat value for over 100 marine species,[32] including benthicinvertebrates, [33] commercially important fish,[34] wild ducks,[35]shorebirds,[36] and seabirds.[37] Shoreland owners in Maine, as well as federal, state, and local agencies in the United States, have placed their conservation lands off limits to rockweed removal.[38][39] Rockweed harvesters point to the value of the seasonal jobs created by the harvest operation, and also highlight the differences in impact of different harvesting methods such as machine v hand harvesting.[40]

References

This article incorporates CC BY-2.5 text from the reference[27]

  1. ^ abM. D. Guiry & Wendy Guiry (2006-11-23). "Ascophyllum nodosum (Linnaeus) Le Jolis". AlgaeBase..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
  2. ^ abcW. R. Taylor (1962). Marine Algae of the Northeastern Coast of North America. Ann Arbor, University of Michigan Press. ISBN978-0-472-04904-2.
  3. ^ abcBunker, F.StP., Maggs, C.A., Brodie, J.A. and Bunker, J.A. 2017. Seaweeds of Britain and Ireland. Second Edition. Wild Nature Press, Plymouth, UK. ISBN978-0-9955673-3-7
  4. ^Newton, L. 1931. A Handbook of the British Seaweeds. British Museum, London
  5. ^Harvey, W.H. 1841. A Manual of the British Algae: London, John van Voorst, London
  6. ^S. Hiscock (1979). "A field key to the British brown seaweeds (Heterokontophyta)". Field Studies. 5: 1–44.
  7. ^H. Stegenga, J. J. Bolton & R. J. Anderson (1997). Seaweeds of the South African West Coast. Bolus Herbarium Humber 18, University of Cape Town. ISBN978-0-7992-1793-3.CS1 maint: Uses authors parameter (link)
  8. ^M. J. Lynn (1949). "A rare alga from Larne Lough". Irish Naturalists' Journal. 9: 301–304.
  9. ^D. C. Gibb (1957). "The free-living forms of Ascophyllum nodosum (L.) Le Jol". Journal of Ecology. 45 (1): 49–83. doi:10.2307/2257076. JSTOR2257076.
  10. ^O. Morton (2003). "The marine macroalgae of County Donegal, Ireland". Bulletin of the Irish Biogeographical Society. 27: 3–164.
  11. ^O. Morton (1994). Marine Algae of Northern Ireland. Ulster Museum, Belfast. ISBN978-0-900761-28-7.
  12. ^J. R. Lewis (1964). The Ecology of Rocky Shores. English Universities Press, London.
  13. ^Schonbeck, M. W.; Norton, T. A. (1980). "Factors controlling the lower limits of fucoid algae on the shore". J.exp.mar.biol. Ecol. 43 (2): 131–150. doi:10.1016/0022-0981(80)90021-0.
  14. ^Seip, K. L. (1980). "A mathematical model of competition and colonization in a community of marine benthic algae". Ecological Modelling. 10 (2): 77–104. doi:10.1016/0304-3800(80)90065-4.
  15. ^Seip K. L. "Mathematical models of rocky shore ecosystems". In: Jørgensen S. E. & Mitch W J. (Eds.) Application of ecological modelling in environmental management, Part B, Chap 13, pp 341-433.
  16. ^Geiselman, J. A.; McConnell, O. J. (1981). "Polyphenols in brown algae Fucus vesiculosus and Ascophyllum nodosum: Chemical defenses against the marine herbivorous snail, Littorina littorea". Journal of Chemical Ecology. 7 (6): 1115–1133. doi:10.1007/BF00987632. PMID24420835.
  17. ^C. A. Maggs (1993). Seaweeds of the British Isles. Vol. I: Rhodophyta. Part 3A. Natural History Museum, London. ISBN978-0-11-310045-3.
  18. ^F. Børgesen (1903). Botany of the Færöes Part II, pp. 339-532. Det nordiske Forlag Ernst Bojesen, Copenhagen.
  19. ^F. E. Round (1981). The Ecology of Algae. Cambridge University Press Cambridge. ISBN978-0-521-22583-0.
  20. ^F. G. Hardy & M. D. Guiry (2006). A Check-list and Atlas of the Seaweeds of Britain and Ireland. British Phycological Society, London. ISBN978-3-906166-35-3.
  21. ^H. Stegenga, I. Mol, W. F. Prud'homme van Reine & G. M. Lokhorst (1997). "Checklist of the marine algae of the Netherlands". Gorteria. supplement. 4: 3–57.CS1 maint: Uses authors parameter (link)
  22. ^A. W. Miller; A. L. Chang; N. Cosentino-Manning; G. M. Ruiz (2004). "A new record and eradication of the north Atlantic alga Ascophyllum nodosum (Phaeophyceae) from San Francisco Bay, California, USA". Journal of Phycology. 40 (6): 1028–1031. doi:10.1111/j.1529-8817.2004.04081.x.
  23. ^http://www.fao.org/docrep/005/ac860e/ac860e02.htm
  24. ^J. Norrie & D. A. Hiltz (1999). "Seaweed Extract Research and Applications in Agriculture". Agro Food Industry Hi-tech.
  25. ^L. G. Lewis, N. F. Stanley & G. G. Guist (1988). "Commercial production and applications of algal hydrocolloides". In C. A. Lembi & J. R. Waaland. Algae and Human Affairs. Cambridge University Press, Cambridge. ISBN978-0-521-32115-0.CS1 maint: Uses authors parameter (link)
  26. ^M. D. Guiry & D. J. Garbary (1991). "Geographical and Taxonomic guide to European Seaweeds of Economic Importance". In M. D. Guiry & Blunden. Seaweed Resources in Europe: Uses and Potential. John Wiley & Sons, England. ISBN978-0-471-92947-5.
  27. ^ abcChang, A. L.; Blakeslee, A. M. H.; Miller, A. W.; Ruiz, G. M. (2011). "Establishment Failure in Biological Invasions: A Case History of Littorina littorea in California, USA". PLoS ONE. 6 (1): e16035. doi:10.1371/journal.pone.0016035'' (inactive 2018-09-07).
  28. ^Seip, K.L. (1979). "A mathematical model for the uptake of heavy metals in benthic algae". Ecological Modelling. 6 (3): 183–197. doi:10.1016/0304-3800(79)90012-7.
  29. ^Melhus, A.; Seip, KL; Seip, HM; Myklestad, S. (1978). "A preliminary study of the use of benthic algae as biological indicators of heavy metal pollution in Sørfjorden, Norway". Environ. Pollut. 15: 101107.
  30. ^Effects of phlorotannins from Ascophyllum nodosum (brown seaweed) on in vitro ruminal digestion of mixed forage or barley grain. Y. Wang, Z. Xu, S.J. Bach and T.A. McAllister, Animal Feed Science and Technology, 14 August 2008, Volume 145, Issues 1–4, Pages 375–395, doi:10.1016/j.anifeedsci.2007.03.013
  31. ^T. Trott & P.F. Larsen (2008) Evaluation of short-term changes in rockweed (Ascophyllum nodosum) and associated epifaunal communities following cutter rake harvesting in Maine. "Archived copy"(PDF). Archived from the original(PDF) on 2012-10-13. Retrieved 2011-07-14.CS1 maint: Archived copy as title (link) Maine Department of Marine Resources Retrieved 2011-07-13
  32. ^"Six plans approved for Cobscook Bay rockweed harvest". The Quoddy Tides. March 25, 2011. Retrieved 2011-03-23.
  33. ^P. Larsen (2010). "The Macroinvertebrate Fauna of Rockweed (Ascophyllum nodosum)–Dominated Low-Energy Rocky Shores of the Northern Gulf of Maine". Journal of Coastal Research. 279: 36–42. doi:10.2112/JCOASTRES-D-10-00004.1.
  34. ^"Gulf of Maine Rockweed Conference Notes". Retrieved 2011-03-23.[permanent dead link]
  35. ^B. M. Blinnabd; A. W. Diamonda; D. J. Hamiltonac (2008). "Factors Affecting Selection of Brood-rearing Habitat by Common Eiders (Somateria mollissima) in the Bay of Fundy, New Brunswick, Canada"(Submitted manuscript). Waterbirds. 31 (4): 520–529. doi:10.1675/1524-4695-31.4.520.
  36. ^L. Tudor (2000). "Migratory Shorebird Assessment"(PDF). Maine Department of Inland Fisheries and Wildlife. Archived from the original(PDF) on 2012-10-12.
  37. ^"Life Within the Rockweed". The Quoddy Tides. September 22, 2000. Archived from the original on September 8, 2008. Retrieved 2011-03-24.
  38. ^"Rockweed harvest in question this year". Bangor Daily News. June 29, 2010. Archived from the original on January 17, 2013. Retrieved 2011-03-24.
  39. ^"The Rockweed Coalition, Maps". Retrieved 2011-03-24.
  40. ^Acadian Seaplants Limited. "2011 Rockweed Harvest Plan for Cobscook Bay, Maine"(PDF). Retrieved 2011-03-23.

Ascophyllum nodosum 9

Symbol question.svg
Ascophyllum nodosumAscophyllum nodosum.jpgTaxonomíaDominio: EukaryaReino: Protista(sin rango) Supergrupo SARSuperfilo: HeterokontaClase: PhaeophyceaeOrden: FucalesFamilia: FucaceaeGénero: Ascophyllum
Stackhouse, 1809Especie: A. nodosum
(L.) Le JolisDistribuciónDistribución mundial
Distribución mundial Ascophyllum nodosum es una especie de alga marrón común (Phaeophyceae) de la familia Fucaceae, siendo la única especie en el genusAscophyllum. Es un alga del Océano Atlántico Norte, también conocido como alga de roca o kelp noruego. Es común en la costa occidental de Europa (de Svalbard a Portugal) incluyendo Groenlandia[1]​ y de la costa noreste de América del Norte.[2]​

Descripción[editar]

A. nodosum posee ramas largas e irregulares con vejigas de aire con forma de huevo puestas en serie en intervalos regulares en la fronda.[3]​ La fronda puede alcanzar los 2 metros de longitud y se sujeta a las rocas por un rizoide. Es de color verde oliva y marrón.[4]​[5]​

Ecología[editar]

src=
A. nodosum en una playa de Reino Unido durante la marea baja.
A. nodosum se encuentra mayoritariamente en zonas rocosas de la orillas de la costa, donde incluso puede convertirse en la especie dominante en la zona litoral.[6]​[7]​

La especie se encuentra en un amplia variedad de hábitats costeros como estuarios o zonas costeras más expuestas, aunque es más raro. Esta alga crece bastante despacio, 0.5% por día, y puede vivir entre 10 y 15 años. Puede encontrarse con especies como Fucus vesiculosus y Fucus serratus. Su distribución es también limitada por la salinidad, la exposición ondulatoria, la temperatura, la desecación, y la tensión general.[8]​[9]​[10]​ Pueda tardar aproximadamente cinco años en devenir fértil.

Florotaninos en A. nodosum actúan como defensas químicas contra el caracol herbívoro marino, Littorina littorea.[11]​

Distribución[editar]

Esta especie ha sido vista en Europa en las Islas Feroe, Noruega, Irlanda, Gran Bretaña y la Isla de Man, llegando a la costa norte de España y Portugal, y en América del Norte de la Bahía de Fundy, Nueva Escocia, Isla de Baffin, Estrecho de Hudson, Labrador, y Terranova.[12]​[13]​[14]​[15]​ Ha sido avistada como introducción accidental cerca de San Francisco, California, y erradicado como potencial especie invasora.[16]​

Usos[editar]

A. nodosum es cultivado para uso en algínicos, fertilizante, y la fabricación de comida para consumo animal y humano.[17]​ Contiene ácidos orgánicos, polisacáridos, aminoácidos, y proteínas, por lo que se considera muy beneficioso y es ampliamente utilizado en agricultura.[18]​ Irlanda, Escocia y Noruega han proporcionado el principal suministro de ácido algínico del mundo.[19]​[20]​

Química[editar]

A. nodosum contiene los florotaninos tetraphlorethol C y tetrafucol A.[21]​

Referencias[editar]

  1. ↑M. D. Guiry (23 de noviembre de 2006). «Ascophyllum nodosum (Linnaeus) Le Jolis». AlgaeBase.
  2. ↑W. R. Taylor (1962). Marine Algae of the Northeastern Coast of North America. Ann Arbor, University of Michigan Press. ISBN0-472-04904-6.
  3. ↑Newton, L. 1931.
  4. ↑Harvey, W.H. 1841.
  5. ↑S. Hiscock (1979). «A field key to the British brown seaweeds (Heterokontophyta)». Field Studies5: 1-44.
  6. ↑O. Morton (1994). Marine Algae of Northern Ireland. Ulster Museum, Belfast. ISBN0-900761-28-8.
  7. ↑J. R. Lewis (1964). The Ecology of Rocky Shores. English Universities Press, London.
  8. ↑Schonbeck, M. W.; Norton, T. A. (1980). «Factors controlling the lower limits of fucoid algae on the shore». J.exp.mar.biol. ecol.43: 131-150. doi:10.1016/0022-0981(80)90021-0.
  9. ↑Seip, K. L. (1980). «A mathematical model of competition and colonization in a community of marine benthic algae». Ecological modelling10: 77-104. doi:10.1016/0304-3800(80)90065-4.
  10. ↑Seip K. L. "Mathematical models of rocky shore ecosystems".
  11. ↑Geiselman, J. A.; McConnell, O. J. (1981). «Polyphenols in brown algae Fucus vesiculosus and Ascophyllum nodosum: Chemical defenses against the marine herbivorous snail, Littorina littorea». Journal of Chemical Ecology7 (6): 1115-1133. doi:10.1007/BF00987632.
  12. ↑F. Børgesen (1903). Botany of the Færöes Part II, pp. 339-532. Det nordiske Forlag Ernst Bojesen, Copenhagen.
  13. ↑F. E. Round (1981). The Ecology of Algae. Cambridge University Press Cambridge. ISBN0-521-22583-3.
  14. ↑A Check-list and Atlas of the Seaweeds of Britain and Ireland. British Phycological Society, London. 2006. ISBN3-906166-35-X.
  15. ↑H. Stegenga, I. Mol, W. F. Prud'homme van Reine & G. M. Lokhorst (1997). «Checklist of the marine algae of the Netherlands». Gorteria4: 3-57.
  16. ↑«A new record and eradication of the north Atlantic alga Ascophyllum nodosum (Phaeophyceae) from San Francisco Bay, California, USA». Journal of Phycology40 (6): 1028-1031. 2004. doi:10.1111/j.1529-8817.2004.04081.x.
  17. ↑http://www.fao.org/docrep/005/ac860e/ac860e02.htm
  18. ↑«Seaweed Extract Research and Applications in Agriculture». Agro food Industry hi-tech. 1999.
  19. ↑L. G. Lewis, N. F. Stanley & G. G. Guist (1988). «Commercial production and applications of algal hydrocolloides». En C. A. Lembi & J. R. Waaland. Algae and Human Affairs. Cambridge University Press, Cambridge. ISBN0-521-32115-8.
  20. ↑M. D. Guiry & Blunden, ed. (1991). «Geographical and Taxonomic guide to European Seaweeds of Economic Importance». Seaweed Resources in Europe: Uses and Potential. John Wiley & Sons, England. ISBN0-471-92947-6.
  21. ↑Effects of phlorotannins from Ascophyllum nodosum (brown seaweed) on in vitro ruminal digestion of mixed forage or barley grain.
title=

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  1. no rights reserved, uploaded by Dag Endresen
  2. (c) anonymous, some rights reserved (CC BY-NC-SA), https://eol.org/media/6672307
  3. (c) anonymous, some rights reserved (CC BY-NC-SA), https://eol.org/media/6672308
  4. (c) anonymous, some rights reserved (CC BY-NC-SA), https://eol.org/media/6672309
  5. (c) anonymous, some rights reserved (CC BY-NC-SA), https://eol.org/media/6672310
  6. (c) anonymous, some rights reserved (CC BY-SA), https://eol.org/media/7075680
  7. (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Ascophyllum_nodosum
  8. (c) Wikipedia authors and editors, some rights reserved (CC BY-SA), http://eol.org/data_objects/12941730
  9. (c) Autores y editores de Wikipedia, some rights reserved (CC BY-SA), http://eol.org/data_objects/12434509

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