Overview

Distribution

Range Description

Posidonia angustifolia is endemic to southern Australia from Shark Bay in Western Australia along the coast to northern Tasmania.
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Physical Description

Type Information

Type locality: 4 km NE of Cape Naturaliste, Western Australia
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Ecology

Habitat

Habitat and Ecology

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
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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 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.
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Population

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

Population Trend
Stable
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Threats

Major Threats
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).
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Management

Conservation Actions

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).
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