Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Najadales Posidoniaceae

Scientific Name: Posidonia denhartogii
Species Authority: J.Kuo & Cambridge
Common Name(s):
English Species code: Pd
Taxonomic Notes: This species is part of the P. ostenfeldii complex and is therefore treated as a separate species (Kuo and Cambridge 1984). This species is currently undergoing taxonomic review.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2007-10-23
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 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.

Geographic Range [top]

Range Description: Posidonia denhartogii is endemic to southwestern Australia, ranging from Perth to eastern South Australia.
Countries occurrence:
FAO Marine Fishing Areas:
Indian Ocean – eastern
Lower depth limit (metres): 35
Upper depth limit (metres): 2
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no specific population information for Posidonia denhartogii. The overall population is thought to be stable.
Current Population Trend: Stable
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

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
Generation Length (years): 15

Threats [top]

Major Threat(s): 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).

Conservation Actions [top]

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).

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 denhartogii. The IUCN Red List of Threatened Species 2010: e.T173350A6997176. . Downloaded on 04 October 2015.
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