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Engaewa similis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA ARTHROPODA MALACOSTRACA DECAPODA PARASTACIDAE

Scientific Name: Engaewa similis
Species Authority: Riek, 1967

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2009-06-01
Assessor(s): Burnham, Q.
Reviewer(s): Collen, B. & Richman, N.
Contributor(s): Livingston, F., Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Milligan, HT, Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.
Justification:
Engaewa similis has been assessed as Least Concern (LC). Even though this species has an extent of occurrence of just under 2,600 km² which would qualify it for Endangered (EN), it is unknown whether the current population is fragmented. Although, there have been historical declines in this species' range, it is known to be abundant at sites where it is still persisting. Historically, it was impacted considerably by urbanization and land drainage, but there has been significantly less development in recent years and there are no known current threats to this species.
History:
1996 Endangered
1994 Endangered (Groombridge 1994)

Geographic Range [top]

Range Description: This species is endemic to the Augusta region in Western Australia, and is distributed from the Margaret River to the Windy Harbour region (Morgan and Beatty 2005). Its extent of occurrence (EOO) has been inferred as 2,578 km², and is unlikely to be much greater (Q. Burnham, pers. comm. 2008). It is unknown whether altitude is potentially a limiting factor in the distribution of this species (Q. Burnham, pers. comm. 2008).

Countries:
Native:
Australia (Western Australia)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no population information for this species. However, historical records show that in the last 20 to 40 years, subpopulations have extirpated from some sites (Q. Burnham, pers. comm. 2008). It is thought to be abundant at sites where it is recorded (Q. Burnham, pers. comm. 2008).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species is a primary burrower and is found in swamps and peatlands, in any areas where the water table reaches or nearly reaches the surface, and there is a suitable substrate for burrowing (Q. Burnham, pers. comm. 2008). They are not found in significant water bodies (Q. Burnham, pers. comm. 2008). This species appears to be closely associated to certain hydrological processes and potentially soil types, and responds poorly to disturbance (Q. Burnham, pers. comm. 2008).
Systems: Freshwater

Threats [top]

Major Threat(s): This species is threatened by rapid changes in land use within their combined distribution areas, which have affected surface and ground water conditions in the south-west, destroying their natural habitat (Naturebase 2007). This species has not been found at its type locality since 1960 as it was degraded by cattle, water hole construction and hydrological changes associated with urbanization (Horowitz and Adams 2000). However, these subpopulations would seem not to be under threat at present. This species appears to have a larger distribution and there has been significantly less development around the area where this species is now found (Q. Burnham pers. comm. 2008). Feral pigs also appear to negatively impact this species (Q. Burnham pers. comm. 2008).

Conservation Actions [top]

Conservation Actions: There are no conservation measures in place to protect this species. Although its distribution range does coincide with the D'Entrecasteaux National Park.

Citation: Burnham, Q. 2010. Engaewa similis. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 25 October 2014.
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