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Euastacus yanga

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA ARTHROPODA MALACOSTRACA DECAPODA PARASTACIDAE

Scientific Name: Euastacus yanga
Species Authority: Morgan, 1997
Taxonomic Notes: Morgan (1997) noted the species to be extraordinarily variable across its range, both within and between populations. He acknowledged the possibility that more than one species was regarded as this species in his revision, but on morphological grounds treated them as a single polytypic species. Coughran (2008b) also discussed the possibility that the species may represent several taxa, and discussed the unusual variation in the cuticle partition for the species (a character generally considered to be the most reliable morphological character for the genus). Examination of population genetics is required to clarify the taxonomic status of the species (J. Coughran and J.M. Furse pers.comm 2009).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2010-06-01
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.
Justification:
Euastacus yanga has been assessed as Least Concern. This species is widespread within its broad range. It is considered common within this area, and there are no known major threats at the present time.

Geographic Range [top]

Range Description:

This species is endemic to Australia. This species ranges from the Robertson and Bundanoon areas (New South Wales) to just inside the Victoria border West of Genoa, a distance of 400 km. The region is drained by many coastal streams including Shoalhaven, Clyde, Tuross, Towamba, Wonboyn and Genoa Rivers (Morgan 1997). This is a lowland species that can be found close to sea level, although has typically been collected from altitudes above 60 m (Morgan 1997, Coughran 2008a, J. Coughran and J.M. Furse pers.comm 2009). This species has a distribution of approximately 20,000 km2 (J. Coughran and J.M. Furse pers.comm 2009).

Countries:
Native:
Australia (New South Wales, Victoria)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no population data available for this species.

Morgan (1997) noted the species to be extraordinarily variable across its range, both within and between populations. He acknowledged the possibility that more than one species was regarded as this species in his revision, but on morphological grounds treated them as a single polytypic species. Coughran (2008b) also discussed the possibility that the species may represent several taxa, and discussed the unusual variation in the cuticle partition for the species (a character generally considered to be the most reliable morphological character for the genus). Examination of population genetics is required to clarify the taxonomic status of the species (J. Coughran and J.M. Furse pers.comm 2009).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species inhabits small, coastal streams in southern New South Wales and far eastern Victoria (Morgan 1997). The vegetation along streams is predominantly temperate rainforest or ferns, occasionally dry sclerophyll (Morgan 1997). The species appears to prefer smaller streams with rainforested banks (Morgan 1997).
Systems: Freshwater

Threats [top]

Major Threat(s):

This species is susceptible to the threats of climate change, with particular regard to altered hydrological regimes and severe weather events (J. Coughran and J.M Furse pers. comm. 2009). Climate change modelling predicts that southeastern mainland Australia will experience a warmer and drier climate, leading to decreased run-off and soil moisture (Chiew and McMahon 2002, Howden 2003). This species is also susceptible to threats from over exploitation. This is a large species of Euastacus, colloquially referred to as 'Southern Lobster' in southern New South Wales, and is susceptible to fishing pressure (J. Coughran and J.M Furse pers. comm. 2009). Recreational fishing (in particular the taking of large adults) has the capacity to lead to serious and far reaching impacts on population structure (i.e. the stunted population phenomenon (Huner and Lindqvist 1985, Tulonen et al. 2008), including impairment of reproductive success in females (Tulonen et al. 2008). 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 these exotic species could have localized impacts on this species. 





Conservation Actions [top]

Conservation Actions:

There are no species-specific conservation measures in place for this species. Its distribution may coincide with a number of national parks (J. Coughran and J.M. Furse pers. comm. 2009). Research is required to clarify the population genetics of the species, and should also include population assessment and monitoring, biological and life history information, habitat requirements and resilience to exotic species (J. Coughran and J.M. Furse pers. comm. 2009).  Furthermore, in New South Wales and Victoria, a minimum recreational size limit of 90 mm orbital carapace length (OCL) is in place for any spiny crayfish (DPI 2007, NSW DPI 2007). This species does not attain that size, and so is indirectly protected by this restriction.

 


Citation: Coughran, J. & Furse, J. 2010. Euastacus yanga. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 24 October 2014.
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