Posidonia angustifolia


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Posidonia angustifolia
Species Authority: Cambridge & J.Kuo
Common Name(s):
English Species code: Pg
Taxonomic Notes: This species is a member of the P. australis complex (P. australis Hook.f., P. sinuosa Cambridge & J.Kuo, P. angustifolia Cambridge & J.Kuo) (Campey et al. 2000).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2007-10-17
Assessor(s): Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C.
Reviewer(s): Livingstone, S., Harwell, H. & Carpenter, K.E.
This species is widespread and can live in deeper waters and disturbed environments with low light. There are some localized anthropogenic threats, but the population globally is stable. This species is listed as Least Concern.

Geographic Range [top]

Range Description:Posidonia angustifolia is endemic to southern Australia from Shark Bay in Western Australia along the coast to northern Tasmania.
FAO Marine Fishing Areas:
Indian Ocean – eastern
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: This species occurs in extensive monospecific meadows in deep waters. The population globally is stable.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species tends to be present in deeper waters and thrives in low light and disturbed environments.

Posidonia angustifolia is found on substrate combining fine sand with cobble-sized fractions. Depths range from 2-50 m in open near-shore waters. At shallower depths and in relatively sheltered situations, this species occurs sympatrically with P. sinuosa and Amphibolis spp. At depths of 35 m it has been observed with sparse Heterozostera tasmanica and Halophila ovalis. In well developed meadows this species usually has continuous cover (Cambridge and Kuo 1979).

In Tasmania, it is found mainly in estuary entrances, or in sheltered bays adjacent to Bass Strait Islands (Green and Short 2003).

This species is found sublittorally at depths of from 2-35 m on substrates of fine sand with larger sized fractions. P. angustifolia occurs most frequently in open inshore waters; while reported as a meadow-forming species (Kirkman and Kuo 1996), it is frequently found together with other seagrass species, particularly in its deeper range (Robertson 1984). Robertson also noted that some plants from the eastern limit of its range are of a broad-leaved form, and may be intermediate between P. angustifolia and P. australis.
Systems: Marine

Use and Trade [top]

Use and Trade: In south Australia, leaves were harvested from the beach for soil conditioner and compost mixes.

Threats [top]

Major Threat(s): In Western Australia, human activities such as direct physical damage caused by port and industrial development, pipelines, communication cables, mining and dredging, excessive loads of nutrients causing seagrass overgrowth and smothering of epiphytes, land based activity associated with ports, industry, aquaculture, farming, direct physical damage by recreational and commercial boating activities are threats to seagrasses (Green and Short 2003).

Conservation Actions [top]

Conservation Actions: Seagrasses cannot be damaged without a permit in the state of New South Whales in Australia. This species also is protected in various Marine Protected Areas (MPAs), in Fisheries Acts or in National or Marine Park Acts (Green and Short 2003).

Bibliography [top]

Cambridge, M.L. and Kuo, J. 1979. Two new species of seagrasses from Australia, Posidonia sinuosa and P. angustifolia (Posidoniaceae). Aquatic Botany 6: 307-328.

Campey, M.L., Waycott, M. and Kendrick, G.A. 2000. Re-evaluating species boundaries among members of the Posidonia ostenfeldii species complex (Posidoniaceae) - morphological and genetic variation. Aquatic Botany 66(1): 41-56.

Green, E.P. and Short, F.T. 2003. World Atlas of Seagrasses. University of California Press, Berkeley.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).

Kirkman, H. and Kuo, J. 1996. Seagrasses of the southern coast of Western Australia. In: J. Kuo, R.C. Phillips, D.I. Walker and H. Kirkman (eds), Seagrass Biology: proceedings of an International Workshop , Rottnest Island, Western Australia, 25-29 January 1996, pp. 51-56. Faculty of Science, University of Western Australia, Nedlands, Western Australia.

Robertson, E. 1984. Seagrasses. In: H.B.S. Womersley (ed.), The Marine Benthic Flora of Southern Australia. Part I. Handbook of the Flora & Fauna of South Australia, pp. 57-122. South Australian Government Printer, Adelaide.

Walker, D.I. 1989. Regional studies - seagrass in Shark Bay, the foundations of an ecosystem. In: A.W.D. Larkum, A.J. McComb and S.A. Shepherd (eds), Biology of Seagrasses. A treatise on the biology of seagrasses with special reference to the Australian region, pp. 182-210. Elsevier, Amsterdam.

Walker, D.I. 1990. Seagrass in Shark Bay, Western Australia. In: P.F. Berry, S.D. Bradshaw and B.R. Wilson (eds), Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee, pp. 101-106. Western Australian Museum, Perth.

Citation: Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C. 2010. Posidonia angustifolia. In: The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 31 March 2015.
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