|Scientific Name:||Euastacus gumar|
|Species Authority:||Morgan, 1997|
|Red List Category & Criteria:||Endangered B1ab(iii) ver 3.1|
|Assessor(s):||Furse, J. & Coughran, 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 gumar has been assessed as Endangered B1ab(iii). It has an extent of occurrence of 985 km2, and has a severely fragmented distribution with only 3 distinct subpopulations. 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.
|Range Description:||This species is endemic to |
Native:Australia (New South Wales)
|Range Map:||Click here to open the map viewer and explore range.|
There is no population information available for this species. Its distribution consists of three distinct, severely fragmented populations separated by unsuitable habitat in intervening lowlands or steep mountain ranges (Coughran in press, Morgan 1997, Ponniah and Hughes 2006).
|Current Population Trend:||Unknown|
|Habitat and Ecology:||This species is found in rivers and streams along gullies in wet and dry sclerophyll forest on exposed ridges (Morgan 1997). The surrounding lower country has been extensively cleared for agriculture and is inhabited by Cherax (Morgan 1997). Further information on the ecology of the species has been documented by Coughran (2000, 2006 in press).|
Given its highly restricted range, this species is extremely susceptible to localized impacts, including bush fires, forest management practices, habitat destruction and over-exploitation by collectors (J. Coughran and J.M. Furse pers. comm. 2009). This species is also susceptible to climate change, including increasing temperature, alterations to hydrological regimes, severe weather events and loss of suitable highland habitat (Chiew and McMahon 2002, Howden 2003, Hughes 2003, Pittock 2003, Hennessy 2006, Westoby and Burgman 2006, IPCC 2007).
There is a potential large scale threat from Cane Toads (Rhinella marina) (DEH 2004b) although there is no specific information on impacts upon this species. Other introduced exotic species (cats, foxes, pigs, goats) that have generally been found to impact on crayfish (Green and Osbourne 1981, Horwitz 1990, Merrick 1995, Eyre et al. 1997, ACT Government 2007, O'Brien 2007) also occur in this species' range (DEH 2004a,c,d,e) and given this species highly restricted distribution, could have serious impacts by contributing to declines in its distribution and/or abundance (J. Coughran and J.M. Furse pers. comm. 2009). Due to the narrow thermal tolerance of this species, and its restricted range (restricted to cool, headwater streams in forested catchments), global temperature increase has resulted in range contraction. This species is further compromised by the presence of exotic species (feral pigs, goats, foxes, Cane Toads and cats) which are known to predate on crayfish and degrade riparian habitat; while the precise effects of these threats on this species are not yet well understood, they are believed to be significantly impacting the long term viability of the population (J. Furse and J. Coughran pers. comm. 2010).
There are no species-specific conservation measures in place for this species, however its distribution range coincides with the
|Citation:||Furse, J. & Coughran, J. 2010. Euastacus gumar. The IUCN Red List of Threatened Species 2010: e.T153609A4519793.Downloaded on 27 February 2017.|
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