Geographic ranges, sympatry and the influence of environmental factors on the distribution of species of an endemic Tasmanian freshwater crayfish
Hansen, B and Richardson, AMM (2001) Geographic ranges, sympatry and the influence of environmental factors on the distribution of species of an endemic Tasmanian freshwater crayfish. Invertebrate Systematics, 16 . pp. 621-629.
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Official URL: http://dx.doi.org/10.1071/IS05035
The Tasmanian endemic freshwater crayfish genus Parastacoides is presently under review and 14 species have been recognised. The distributions of the putative species have been mapped using museum data. The distribution of geographical ranges of the species is highly skewed. Most species are local or short-range endemics, 11 of the 14 species (nearly 79%) having geographical ranges of less than 20 km2. Many sympatric contact zones exist where distributions of species meet, and in some cases the sympatric species partition the habitat. The majority of species appear capable of exploiting a wide variety of habitat types. Ecological factors such as climate, vegetation, substrate, baseline geology and burrow types do not seem to be major determinants of species distributions. A, but adequate rainfall and a low evaporation rate appear to be the major factors determining the eastern boundary of Parastacoides. It is likely that that historical factors have played an important role in determining the present distribution patterns.
|Keywords:||Freshwater crayfish, geographic range, sympatry, parapatry, Tasmania|
|Deposited By:||A/Prof Alastair Richardson|
|Deposited On:||27 Jul 2007|
|Last Modified:||18 Jul 2008 20:02|
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