Regional faunal decline – reptile occurrence in fragmented rural landscapes of south-eastern Australia

Brown, Geoff W., Bennett, Andrew F. and Potts, Joanne M. 2008, Regional faunal decline – reptile occurrence in fragmented rural landscapes of south-eastern Australia, Wildlife research, vol. 35, no. 1, pp. 8-18, doi: 10.1071/WR07010.

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Title Regional faunal decline – reptile occurrence in fragmented rural landscapes of south-eastern Australia
Author(s) Brown, Geoff W.
Bennett, Andrew F.
Potts, Joanne M.
Journal name Wildlife research
Volume number 35
Issue number 1
Start page 8
End page 18
Total pages 11
Publisher CSIRO
Place of publication Collingwood, Vic.
Publication date 2008
ISSN 1035-3712
Summary Many species of reptiles are sedentary and depend on ground-layer habitats, suggesting that they may be particularly vulnerable to landscape changes that result in isolation or degradation of native vegetation. We investigated patterns of reptile distribution and abundance in remnant woodland across the Victorian Riverina, south-eastern Australia, a bioregion highly modified (>90%) by clearing for agriculture. Reptiles were intensively surveyed by pitfall trapping and censuses at 60 sites, stratified to sample small (<30 ha) and large (>30 ha) remnants, and linear strips of roadside and streamside vegetation, across the regional environmental gradient. The recorded assemblage of 21 species was characterised by low abundance and patchy distribution of species. Reptiles were not recorded by either survey technique at 22% of sites and at a further 10% only a single individual was detected. More than half (53%) of all records were of two widespread, generalist skink species. Multivariate models showed that the distribution of reptiles is influenced by factors operating at several levels. The environmental gradient exerts a strong influence, with increasing species richness and numbers of individuals from east (moister, higher elevation) to west (drier, lower elevation). Differences existed between types of remnants, with roadside vegetation standing out as important; this probably reflects greater structural heterogeneity of ground and shrub strata than in remnants subject to grazing by stock. Although comparative historical data are lacking, we argue that there has been a region-wide decline in the status of reptiles in the Victorian Riverina involving: (1) overall population decline commensurate with loss of >90% of native vegetation; (2) disproportionate decline of grassy dry woodlands and their fauna (cf. floodplains); and (3) changes to populations and assemblages in surviving remnants due to effects of land-use on reptile habitats. Many species now occur as disjunct populations, vulnerable to changing land-use. The status of reptiles in rural Australia warrants greater attention than has been given to date. Effective conservation of this component of the biota requires better understanding of the population dynamics, habitat use and dispersal capacity of species; and a commitment to landscape restoration coupled with effective ecological monitoring.
Language eng
DOI 10.1071/WR07010
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 960505 Ecosystem Assessment and Management of Forest and Woodlands Environments
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2008, CSIRO
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