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Wildlife Research Wildlife Research Society
Ecology, management and conservation in natural and modified habitats
RESEARCH ARTICLE

Persistence of the broad-toothed rat (Mastacomys fuscus) across Victoria is correlated with climate and elevation

S. Shipway A B C , K. M. C. Rowe A B and K. C. Rowe A B D
+ Author Affiliations
- Author Affiliations

A Sciences Department, Museums Victoria, GPO Box 666, Melbourne, Vic. 3001, Australia.

B School of BioSciences, The University of Melbourne, Parkville, Vic. 3010, Australia.

C Bush Heritage Australia, Melbourne, Vic. 3000, Australia.

D Corresponding author. Email: krowe@museum.vic.gov.au

Wildlife Research 47(3) 267-278 https://doi.org/10.1071/WR19077
Submitted: 13 May 2019  Accepted: 8 December 2019   Published: 20 April 2020

Abstract

Context: The broad-toothed rat (Mastacomys fuscus; BTR) is distributed throughout south-eastern Australia, but its populations are restricted and dispersed. BTRs prefer cooler, wetter habitats and, as such, future climate change is projected to lead to further range reductions. However, recent changes in its distribution have not been well documented, and there is limited knowledge about the current occupancy and population size of the species in Victoria.

Aims: To evaluate recent historical changes in the distribution of BTRs in Victoria, and to test whether changes in distribution are correlated with climate and elevation.

Methods: We obtained all documented records of BTRs in the state before 1990 and used field notes and verbal descriptions to geo-reference their historical localities. We then used a repeated sampling design to resurvey all historically occupied sites with a geographic coordinate uncertainty of 4 km or less. We tested for the effects of climate and elevation on the persistence of BTRs.

Key results: We detected BTRs at 32 of 68 historical sites surveyed. Consistent with climate model predictions, site persistence was more likely to occur at sites of higher elevation and precipitation and less likely to occur at sites with a higher temperature. Minimum temperature of the coldest month was the single best predictor of persistence.

Conclusions: These results demonstrated a substantial decline in the persistence of BTRs at historical sites across Victoria and provided a benchmark for future monitoring and management efforts.

Implications: The decline of BTRs from historically occupied sites across Victoria is consistent with their listing as endangered in the state, and climate correlations suggest further declines, with projected climate change compounding other threats to the species such as introduced predators, feral herbivores, fire and land use. However, the status of BTRs in Victoria and understanding of the threats to their persistence are based on sparse data, highlighting the critical need for more effective monitoring of the species.

Additional keywords: Australia, climate change, distribution, mammal, rodent.


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