|Scientific Name:||Euastacus bidawalis Morgan, 1986|
|Red List Category & Criteria:||Endangered B1ab(iii) ver 3.1|
|Assessor(s):||Furse, J., Coughran, J. & Lawler, S.|
|Reviewer(s):||Collen, B. & Richman, N.|
|Contributor(s):||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 bidawalis has been assessed as Endangered under criterion B1ab(iii). This species has an extent of occurrence of 2,087 km2, and a severely fragmented distribution. This species' quality of habitat is compromised by both current and future threats including exotic species, alteration to the hydrological flow of aquatic systems, and climate change. There is a major threat of water shortage in areas of high demand for agriculture, industry and domestic use. Research should be initiated to include population assessment and monitoring, biological and life history information, habitat requirements, investigations into thermal tolerance and resilience to exotic species.
This species is endemic to Australia. It ranges from near Mount Imlay south of Eden, New South Wales to Lind National Park near Cann River, Victoria, a distance of 90 km (J.M. Furse and J. Coughran pers. comm. 2008). It is a highland species known from altitudes between 150 and 400 m above sea level (Morgan 1986). The extent of occurrence for the species is 2,087 km2. Although the species occurs in a number of streams, these are headwaters of various different drainages, on different mountain ranges, and therefore the species distribution is clearly fragmented (Morgan 1997, Ponniah and Hughes 2006).
Native:Australia (New South Wales, Victoria)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||There is no population information available for this species.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:|| |
This species is found in streams bordered by sclerophyll forest, with dry sclerophyll and heath on ridges (Morgan 1986). The species inhabits some cleared areas providing that riparian vegetation is present along creeks (Morgan 1986).
The slow growth rate and low fecundity of many Euastacus renders them less resilient to reduction in population numbers through habitat destruction and catastrophic events (Van Praagh 2003).
|Use and Trade:||This species is illegally harvested by fishers and collectors.|
|Major Threat(s):||The species is susceptible to the following threats: 1. Climate change, particularly with regard to altered hydrological regimes and severe weather events. Climate change modeling predicts that southeastern mainland Australia will experience a warmer and drier climate, leading to decreased runoff and soil moisture (Chiew and McMahon 2002, Howden 2003, Hughes 2003, Pittock 2003, Hennessy 2006, Westoby and Burgman 2006, IPCC 2007); 2. The alteration of hydrological regimes is likely to impact environmental flows, particularly in areas of increasing demand for domestic, industrial and agricultural water supplies (Hennessy 2006); 3. Over-exploitation. Although technically protected by recreational fishing regulations, this restricted range species is susceptible to over-exploitation by collectors and illegal fishing pressure (O’Brien 2007); 4. Exotic fish. Potentially large scale threats from exotic fishes such as Brown Trout or Redfin Perch, which are prevalent throughout the region (Davies and McDowall 1996, Rowe et al. 2008); 5. Other exotic species (cats, foxes, pigs, goats) that have generally been found to impact on crayfish (e.g. 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,b,c,d), and could have localised impacts on E. bidawalus and contribute to declines in distribution and/or local abundance (J.M. Furse and J. Coughran pers. comm. 2008).|
There are no species-specific conservation measures in place for Euastacus bidawalus, however its distribution range may coincide with a number of National Parks. In New South Wales and Victoria minimum recreational size limits of 90 mm OCL are in place for any spiny crayfish (DPI 2007, NSW DPI 2007), Euastacus bidawalus does not attain that size, so is indirectly protected by this restriction.
Research should be initiated to include population assessment and monitoring, biological and life history information, habitat requirements, investigations into thermal tolerance and resilience to exotic species (J.M. Furse and J. Coughran pers. comm. 2008).
Australian Capital Territory (ACT) Government. 2007. Ribbons of Life: ACT Aquatic Species and Riparian Zone Conservation Strategy, Action Plan No. 29. Department of Territory and Municipal Services, Canberra, Australia.
Chiew, F.H.S. and McMahon, T.A. 2002. Modelling the impacts of climate change on Australian streamflow. Hydrological Processes 16: 1235-1245.
Davies, P. E and McDowall, R. M. 1996. 'Family Salmonidae. Salmons, trouts and chars'. In: McDowall, R. M. (ed.), Freshwater Fishes of South-eastern Australia, A.H. and A.W. Reed Pty Ltd, Sydney.
Department of the Environment and Heritage. 2004a. European red fox (Vulpes vulpes). Invasive species fact sheet. Department of the Environment and Heritage, Canberra, Australian Capital Territory, Australia.
Department of the Environment and Heritage. 2004c. The feral cat (Felis catus). Invasive species fact sheet. Department of the Environment and Heritage, Canberra, Australian Capital Territory, Australia.
Department of the Environment and Heritage. 2004d. The feral goat (Capra hircus). Invasive species fact sheet. Department of the Environment and Heritage, Canberra, Australian Capital Territory, Australia.
Department of the Environment and Heritage. 2004e. The feral pig (Sus scrofa). Invasive species fact sheet. Department of the Environment and Heritage, Canberra, Australia Capital Territory, Australia.
Eyre, T., Barratt, D. and Venz, M. 1997. Systematic Vertebrate Fauna Survey Project: Stage II – Assessment of Habitat Quality for Priority Species in Southeast Queensland Bioregion. In: Queensland CRA/RFA Steering Committee (ed.). Queensland.
Fetzner, J.W. 2008. Crayfish Taxonomy Browser. Available at: http://iz.carnegiemnh.org/crayfish/NewAstacidea/infraorder.asp?io=Astacidea. (Accessed: June).
Green, K. and Osbourne, W.F. 1981. The diet of foxes, Vulpes vulpes (L.) in relation to abundance of prey above the winter snowline in New South Wales. Australian Wildlife Research 8: 349-360.
Hennessy, K. 2006. Climate change scenarios for initial assessment of risk in accordance with risk management guidance. Commonwealth Scientific and Industrial Research Organization, Australia.
Horwitz, P. 1990. The conservation status of Australian freshwater crustacea with a provisional list of threatened species, habitats and potentially threatening processes. Report number 14. Australian National Parks and Wildlife Service, Canberra.
Howden, M. 2003. Climate trends and climate change scenarios. In: Howden, M., Hughes, L., Dunlop, M., Zethoven, I., Hilbert, D and Chilcott, C (eds), Climate Change Impacts On Biodiversity In Australia. Outcomes of a workshop sponsored by the Biological Diversity Advisory Committee, 1–2 October 2002, Canberra, Australia.
Hughes, L. 2003. Climate change and Australia: Trends, projections and impacts. Austral Ecology 28: 423-443.
Intergovernmental Panel on Climate Change. 2007. Climate Change 2007 – Synthesis Report. An Assessment of the Intergovernmental Panel on Climate Change. Intergovernmental Panel on Climate Change, Geneva, Switzerland.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).
Merrick, J.R. 1995. Diversity, distribution and conservation of freshwater crayfishes in the eastern highlands of New South Wales. Proceedings of the Linnean Society of New South Wales 115: 247-258.
Morgan, G.J. 1986. Freshwater crayfish of the genus Euastacus Clark (Decapoda, Parastacidae) from Victoria. Memoirs of the Museum of Victoria 47(1): 1-57.
Morgan, G.J. 1997. Freshwater crayfish of the genus Euastacus Clark (Decapoda: Parastacidae) from New South Wales, with a key to all species of the genus. Records of the Australian Museum Supplement 23: 1-110.
Morgan, G. L. 1983. A taxonomic revision of the freshwater crayfish genus Euastacus (Decapoda: Parastacidae). Monash University.
New South Wales Department of Primary Industries. 2007. New South Wales Recreational Freshwater Fishing Guide 2008. Available at: http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0013/202351/fw-guide.pdf.
O'Brien, M.B. 2007. Freshwater and terrestrial crayfish (Decapoda, Parastacidae) of Victoria, status, conservation, threatening processes and bibliography. The Victorian Naturalist 14(4): 210-229.
Pittock, B. 2003. Climate Change: An Australian Guide to the Science and Potential Impacts. Australian Greenhouse Office, Canberra.
Ponniah, M. and Hughes, J.M. 2006. The evolution of Queensland spiny mountain crayfish of the genus Euastacus. II. Investigating simultaneous vicariance with intraspecific genetic data. Marine and Freshwater Research 57(3): 349-362.
Rowe, D. K., Moore, A., Giorgetti, A., Maclean, C., Grace, P., Wadhwa, S. and Cooke, J. 2008. Review of the impacts of gambusia, redfin perch, tench, roach, yellowfin goby and streaked goby in Australia. Prepared for the Australian Government Department of the Environment, Water, Heritage and the Arts.
Westoby, M. and Burgman, M. 2006. Commentary. Climate change as a threatening process. Austral Ecology 31: 549-550.
|Citation:||Furse, J., Coughran, J. & Lawler, S. 2010. Euastacus bidawalis. The IUCN Red List of Threatened Species 2010: e.T153720A4536402.Downloaded on 21 March 2018.|
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