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Abstract

Although there are close associations with the south-western fauna , there are nevertheless some aquatic invertebrates found predominantly in western Tasmania, and some biological problems best studied by reference to such animals; examples from two families of crustacea and two insect orders are discussed in this paper .
Western Tasmania may be regarded as the freshwater crayfish ( Parastacidae) centre of the State , all four Tasmanian genera being found there . Each genus is discussed in turn ; the habitats utilised are considered and adaptation to these habitats is illustrated by particular reference to burrow systems , calcium distribution in the exoskeleton and where possible , breeding patterns . Data is also provided on distribution and associated zoogeographical questions are briefly considered .
Two genera of the fami ly Koonungidae ( Syncarida) are found in the west - Micraspides and Koonunga . Their habitats and distribution are discussed and attention is drawn to the need for more ecological data in order to formulate answers to the zoogeographical issues involved .
The Odonata exemplify an insect order with generally good dispersal power s . Al l dragonfly species found in west ern Tasmania, together with their nymphal habitats, are collated and discussed. The most interesting species are the cold- climate adapted species , especial by archaics such as Archipetalia auriculata and Synthemiopsis gomphomacromioides. Attention is drawn to the probable importance of diapaus e as an adaptation to cold montane habitats . Three component s are recognised in the odonatan fauna , - cosmopolitan groups , ancient Australasian groups , and very ancient Gondwanal and relics .
The Plecoptera is an order demonstrat ing poor vagilty and only 6 of 31 Tasmanian species are shared with mainland Australia . The major ty of Tasmanian species are cold climate adapted forms and consequently west ern waters have a particularly conspicuous s tone fly fauna . Data on the habitats and distribution of a l l species found in west ern Tasmania is collated and discussed.
The influence of man on aquatic environments in west ern Tasmania is briefly considered . Environmental modification result s from mining activities , hydro-electric development , forestry practices and from the introduction of exotic species such as trout.

Item Type:	Article
Authors/Creators:	Swain, R and Allbrook, P and Lake, PS
Keywords:	Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title:	Papers and Proceedings of the Royal Society of Tasmania
ISSN:	0080-4703
DOI / ID Number:	https://doi.org/10.26749/rstpp.111.1.81
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	Edited by M.R. Banks and J.B. Kirkpatrick. - Copyright Royal Society of Tasmania
Item Statistics:	View statistics for this item

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