Overview

Distribution

Range Description

Posidonia denhartogii is endemic to southwestern Australia, ranging from Perth to eastern South Australia.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
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).

Campey et al. (2000) implies that vegetative morphological characters, upon which five species of the P. ostenfeldii complex were erected, was 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 species is found in open ocean and is commonly recorded. The population status is unknown and there are no major threats, although there are localized declines due to human activities. The overall population is thought to be stable. This species is listed as Least Concern.
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Population

Population
There is no specific population information for Posidonia denhartogii. The overall population is thought to be stable.

Population Trend
Stable
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Threats

Major Threats
Threats may include coastal development by industry, pipelines, communication cables, mining and dredging. Additional threats include pollution from eutrophication causing seagrass overgrowth and smothering of epiphytes, aquaculture, farming and direct physical damage by recreational and commercial boating activities (Green and Short 2003).
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Management

Conservation Actions

Conservation Actions
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).
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