The Distribution and Status of The New Holland Mouse, Pseudomys novaehollandiae (Waterhouse 1843) In Victoria.

Abstract

The New Holland Mouse (Pseudomys novaehollandiae) is an endangered species in Victoria. The aims of this study were to determine the present distribution of the species and to identify processes and habitat modification that threaten the species future status. Survey trapping was carried out in areas where P. novaehollandiae had been recorded previously. The species is in a demonstrable state of decline, and there is evidence that it has been lost from at least three and possibly six localities in the past 10-16 years. The species decline appears to have resulted from a combination of systematic factors, the most important of which is habitat loss due to clearing of native vegetation, and the subsequent fragmentation of populations. Altered fire regimes and the consequent changes to the productivity of vegetation and the diet of the species are also likely to be important factors. The areas where P. novaehollandiae remains extant Anglesea, Loch Sport, Providence Ponds, Wilson's Promontory and possibly Mullungdung now assume much greater importance. Critical habitat should be identified and managed. While research questions concerning the population dynamics of the species and threats to its survival remain unanswered, management actions are required immediately. These include monitoring known populations, ensuring protection of habitats, identifying potential habitat and determining suitable management regimes.