|Scientific Name:||Euastacus yigara|
|Species Authority:||Short & Davey, 1993|
|Red List Category & Criteria:||Critically Endangered B1ab(iii) ver 3.1|
|Assessor(s):||Coughran, J. & Furse, J.|
|Reviewer(s):||Collen, B. & Richman, N.|
|Contributor(s):||Livingston, F., Livingston, F., Soulsby, A.-M., Batchelor, A., Dyer, E., Whitton, F., Milligan, H.T., Smith, J., Lutz, M.L., De Silva, R., McGuinness, S., Kasthala, G., Jopling, B., Sullivan, K. & Cryer, G.|
Euastacus yigara has been assessed as Critically Endangered under criterion B1ab(iii). This species is only known from a single location and has an extent of occurrence of around 10 km2. There has been a continuing decline in the quality of habitat due to the destructive nature of a number of exotic species in the area, some of which also predate upon this species. There is also destruction of suitable rainforest habitat in parts of its range. This species also faces the consequences of global temperature rise. As a restricted range species, dependent on cool, clear headwater streams, a slight increase in temperature could rapidly extirpate this species. Research should be initiated to include population assessment and monitoring, biological and life history information, habitat requirements, and resilience to effects of exotic species.
This species is endemic to Australia. It is currently known from a single site in O'Leary Creek, a tributary of the upper Tully River above Koombooloomba Dam, North Queensland (Short and Davie 1993). This species has an extent of occurrence of around 10 km2.
|Range Map:||Click here to open the map viewer and explore range.|
This species is apparently rare (J. Coughran and J. M. Furse pers. comm. 2009). Recent (Oct 2008) targeted surveys in a number of streams and gullies proximal to the type locality failed to locate any specimens of this species, although the habitat was apparently suitable (Coughran 2008a unpublished data, J. Coughran and J. M. Furse pers. comm. 2009).
|Habitat and Ecology:||This species is known to occur in river and creeks, and has been found under rocks in shallow water. They prefer rock/sand substratum, fringing simple notophyll vine forest with high water clarity (Short and Davie 1993).|
Given the apparently restricted range of each population, the species is susceptible to localized
There are no species specific conservation measures in place for this species, however its distribution range may coincide with the Koombooloomba Forest Reserve (J.Coughran and J.M. Furse pers. comm. 2009). Research should be initiated to include population assessment and monitoring, biological and life history information, habitat requirements, investigations into thermal tolerance, resilience to exotic species (J.Coughran and J.M. Furse pers. comm. 2009).
All species of the genus Euastacus in Queensland are officially no take species under the Fisheries Act 1994 and must be released if captured (DPIF 2007). There is no information available on the levels of compliance, although evidence of illegal poaching is frequently observed. It is also noted that species such as this species are not spiny (Morgan 1988; Short and Davie 1993; Coughran 2008b), and thus may be easily confused with smooth Cherax (unprotected) and inadvertently taken by recreational fishers (J. Coughran and J.M. Furse pers. comm. 2009).
|Citation:||Coughran, J. & Furse, J. 2010. Euastacus yigara. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 28 January 2015.|
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