Overview

Distribution

Range Description

Posidonia ostenfeldii is endemic to Western Australia from Cape Leeuwin to the western edge of the Great Australian Bight.
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Physical Description

Type Information

Type locality: Esperance Bay, Western Australia
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This is a highly distinctive Posidonia species and is the only terete Posidonia, with both vegetative and reproductive differences from the other members of the P. ostenfeldii complex. It is currently being studied for genetic separation by Drs. Kathryn McMahon and Michelle Waycott (G. Kendrick pers. comm. 2009).

This is an open ocean, deep water, high energy species. The P. ostenfeldii complex typically form patchy meadows with mixed species in open ocean or rough water sublittoral habitats (Cambridge 1975). They are characterised by their long, thick, leathery leaves and long leaf sheaths that are deeply buried. These characters appear to be associated with strong wave movement and mobile sand substratum typical of the environments in which they are found (Kuo and Cambridge 1984). This species can withstand swell and sediment movement offshore from Esperance to west of Albany.

Campey et al. (2000) implies that vegetative morphological characters, upon which five species of the P. ostenfeldii complex were erected, is not effective for the identification of species from multiple samples from any one location.

Systems
  • Marine
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

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.

Contributor/s

Justification
This is a very rare species and is only found in a small number of areas. There is very little information known about it. This species is rare and there are no known major threats, although localized threats exist. This species is listed as Least Concern. Research on the taxonomy, ecology and distribution of this species is recommended.
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Population

Population
Posidonia ostenfeldii is rare locally and regionally. There are few collections, and it has been rarely observed in the field. Although rare, this species has been recently found at King George Sound, Albany, Wyllie Bay, Esperance (G. Kendrick pers. comm. 2009).

Population Trend
Unknown
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Threats

Major Threats
There are no known major threats to this species, although localized threats include coastal development, dredging, pollution from eutrophication, aquaculture, an direct physical damage by recreational and commercial boating activities (Green and Short 2003).
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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation measures in place for this species, although it is protected in various Marine Protected Areas, in Fisheries Acts or in National or Marine Park Acts.

It is recommended that the whole P. ostenfeldii complex be reanalyzed and that further morphological and genetic work is carried out (Campey et al. 2000). Research on the taxonomy, ecology and distribution of this species is recommended.
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Wikipedia

Posidonia ostenfeldii

Posidonia ostenfeldii is a species of seagrass that occurs in the southern waters of Australia.

Description[edit source | edit]

A species of Posidonia. A perennial rhizomatous herb that appears as clumps on sand in marine habitat. It is found at depths between 1 and 15 metres. The leaf blades are 6-12 mm wide.

Distribution[edit source | edit]

This species is found in waters around the southern coast of Australia. Posidonia ostenfeldii is recorded at the edge of the Esperance Plains, the Archipelago of the Recherche, at the southern coast of Southwest Australia.

Taxonomy[edit source | edit]

This species is contained by the Posidoniaceae family, one of eight occurring in southern Australia. The ninth member, Posidonia oceanica, is found in the mediterranean sea. Several related species within Posidonia are described as the Posidonia ostenfeldii complex.

References[edit source | edit]

  1. ^ 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 ostenfeldii. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 9 January 2013.
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