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

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

Geoff W. Brown A D , Andrew F. Bennett B and Joanne M. Potts A C
+ Author Affiliations
- Author Affiliations

A Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, 123 Brown Street, Heidelberg, Vic. 3084, Australia.

B School of Life and Environmental Sciences, Deakin University, 221 Burwood Highway, Burwood, Vic. 3125, Australia.

C Present address: Centre for Research into Ecological and Environmental Modelling, The University of St Andrews, The Observatory, Buchanan Gardens, St Andrews, Fife KY16 9LZ, Scotland.

D Corresponding author. Email: geoff.brown@dse.vic.gov.au

Wildlife Research 35(1) 8-18 https://doi.org/10.1071/WR07010
Submitted: 22 January 2007  Accepted: 17 December 2007   Published: 17 March 2008


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.


The efforts of many people, notably staff of the (then) Victorian Department of Natural Resources and Environment (NRE) at the Heidelberg (Arthur Rylah Institute for Environmental Research), Benalla, Nathalia and Cohuna offices, ensured the completion of this study and their input is gratefully acknowledged. In particular, members of the NRE ‘Remnant Habitat’ team, David Hespe, Steffan Krasna, Lindy Lumsden and John Silins, contributed mightily to the installation and monitoring phases of the project. ARIER colleagues Phoebe Macak and Arn Tolsma drafted the map, and Michael Scroggie provided comments on early drafts of this paper. Barbara Baxter (Department of Sustainability and Environment, East Melbourne) provided access to records of the Atlas of Victorian Wildlife database, and Joern Fischer (Australian National University) generously made available unpublished data. This study was funded by the Murray–Darling Basin Commission through its Natural Resources Management Strategy (NRMS) program.


Antos, M. , and Bennett, A. F. (2005). How important are temperate woodlands for ground-foraging birds? Wildlife Research 32, 557–572.
CrossRef |

Barrett, G. W. , Ford, H. A. , and Recher, H. F. (1994). Conservation of woodland birds in a fragmented landscape. Pacific Conservation Biology 1, 245–256.

Bennett, A. F. (1990). Land use, forest fragmentation and the mammalian fauna at Naringal, south-western Victoria. Australian Wildlife Research 17, 325–347.
CrossRef |

Bennett, A. F. , and Ford, L. A. (1997). Land use, habitat change and the conservation of birds in fragmented rural environments: a landscape perspective from the Northern Plains, Victoria, Australia. Pacific Conservation Biology 3, 244–261.

Bennett, A. F. , Lumsden, L. F. , and Nicholls, A. O. (1994). Tree hollows as a resource for wildlife in remnant woodlands: spatial and temporal patterns across the northern plains of Victoria, Australia. Pacific Conservation Biology 1, 222–235.

Booth G. D., Niccolucci M. J., and Schuster E. G. (1994). Identifying proxy sets in multiple linear regression: an aid to better coefficient interpretation. Intermountain Research Station, USDA Forest Service, Ogden, UT.

Brown, G. W. (2001). The influence of habitat disturbance on reptiles in a box–ironbark eucalypt forest of south-eastern Australia. Biodiversity and Conservation 10, 161–176.
CrossRef |

Burbidge, A. A. , and McKenzie, N. L. (1989). Patterns in the modern decline of Western Australia’s vertebrate fauna: causes and conservation implications. Biological Conservation 50, 143–198.
CrossRef |

Busby J. R. (1991). BIOCLIM – a bioclimatic analysis and prediction system. In ‘Nature Conservation: Cost Effective Biological Surveys and Data Analysis’. (Eds C. R. Margules and M. P. Austin.) pp. 64–68. (CSIRO: Australia.)

Clemann, N. , Long, K. , Skurrie, D. , and Dzuris, J. (2005). A trapping survey of small, ground-dwelling vertebrates in the Little Desert National Park, Victoria. The Victorian Naturalist 33, 119–126.

Cogger H. G. (2000). ‘Reptiles and Amphibians of Australia.’ (Reed New Holland: Sydney.)

Cogger H. G., and Heatwole H. (1981). The Australian reptiles: origins, biogeography, distribution patterns and island evolution. In ‘Ecological Biogeography of Australia’. (Ed. A. Keast.) pp. 1332–1373. (Dr W. Junk: The Hague.)

Coulson G. (1990). Conservation biology of the striped legless lizard (Delma impar). An initial investigation. Arthur Rylah Institute for Environmental Research, Department of Conservation, Forests and Lands, East Melbourne, Victoria.

Cunningham, R. B. , Lindenmayer, D. B. , Crane, M. , Michael, D. , and MacGregor, C. (2007). Reptile and arboreal marsupial response to replanted vegetation in agricultural landscapes. Ecological Applications 17, 609–619.
CrossRef | PubMed |

Department of Natural Resources and Environment (1997). ‘Victoria’s Biodiversity: Directions in Management.’ (Department of Natural Resources and Environment: Melbourne.)

Downey F. J., and Dickman C. R. (1993). Macro- and microhabitat relationships among lizards of sandridge desert in central Australia. In ‘Herpetology in Australia. A Diverse Discipline’. (Eds D. Lunney and D. Ayers.) pp. 133–138. (Royal Zoological Society of New South Wales: Sydney.)

Driscoll, D. A. (2004). Extinction and outbreaks accompany fragmentation of a reptile community. Ecological Applications 14, 220–240.
CrossRef |

Fielding, A. H. , and Bell, J. F. (1997). A review of methods for the assessment of prediction errors in conservation presence/absence models. Environmental Conservation 24, 38–49.
CrossRef |

Fischer, J. , Lindenmayer, D. , and Cowling, A. (2003). Habitat models for the four-fingered skink (Carlia tetradactyla) at the microhabitat and landscape scale. Wildlife Research 30, 495–504.
CrossRef |

Fischer, J. , Lindenmayer, D. B. , and Cowling, A. (2004). The challenge of managing multiple species at multiple scales: reptiles in an Australian grazing landscape. Journal of Applied Ecology 41, 32–44.
CrossRef |

Fischer, J. , Lindenmayer, D. B. , Barry, S. , and Flowers, E. (2005). Lizard distribution patterns in the Tumut fragmentation “Natural Experiment” in south-eastern Australia. Biological Conservation 123, 301–315.
CrossRef |

Foley, J. A. , DeFries, R. , Asner, G. P. , Barford, C. , and Bonan, G. , et al. (2005). Global consequences of land use. Science 309, 570–574.
CrossRef | PubMed |

Ford, H. A. , Barrett, G. W. , Saunders, D. A. , and Recher, H. F. (2001). Why have birds in the woodlands of southern Australia declined? Biological Conservation 97, 71–88.
CrossRef |

Gibbons, J. W. , Scott, D. E. , Ryan, T. J. , Buhlmann, K. A. , and Tuberville, T. D. , et al. (2000). The global decline of reptiles, déjà vu amphibians. Bioscience 50, 653–666.
CrossRef |

Greer A. (1997). ‘The Biology and Evolution of Australian Snakes.’ (Surrey Beatty: Sydney.)

Hadden, S. A. , and Westbrooke, M. E. (1996). Habitat relationships of the herpetofauna of remnant buloke woodlands of the Wimmera Plains, Victoria. Wildlife Research 23, 363–372.
CrossRef |

Hobbs R. J., and Yates C. J. (Eds) (2000). ‘Temperate Eucalypt Woodlands in Australia. Biology, Conservation, Management and Restoration.’ (Surrey Beatty: Sydney.)

Hutchinson M. N. (1993). Family Scincidae. In ‘Fauna of Australia. Vol. 2A. Amphibia & Reptilia’. (Eds C. J. Glasby, G. J. B. Ross and P. L. Beesley.) pp. 261–279. (Australian Government Printing Service: Canberra.)

Kanowski, J. J. , Reis, T. M. , Catterall, C. P. , and Piper, S. (2006). Factors affecting the use of reforested sites by reptiles in cleared rainforest landscapes in tropical and subtropical Australia. Restoration Ecology 14, 67–76.
CrossRef |

Kitchener, D. J. , Chapman, A. , Dell, J. , Muir, B. J. , and Palmer, M. (1980). Lizard assemblage and reserve size and structure in the Western Australian wheatbelt – some implications for conservation. Biological Conservation 18, 179–207.
CrossRef |

Land Conservation Council (1983). Report on the Murray Valley area. Land Conservation Council, Melbourne, Victoria.

Laurance W. F., and Bierregard R. O. (Eds) (1997). ‘Tropical Forest Remnants: Ecology, Management, and Conservation of Fragmented Communities.’ (University of Chicago Press: Chicago.)

Law, B. S. , Anderson, J. , and Chidel, M. (1999). Bat communities in a fragmented forest landscape on the south-west slopes of New South Wales, Australia. Biological Conservation 88, 333–345.
CrossRef |

Leathwick, J. R. , Elith, J. , and Hastie, T. (2006). Comparative performance of generalized additive models and multivariate adaptive regression splines for statistical modelling of species distributions. Ecological Modelling 199, 188–196.
CrossRef |

Lindenmayer D. B., and Fischer J. (2006). ‘Habitat Fragmentation and Landscape Change. An Ecological and Conservation Synthesis.’ (CSIRO Publishing: Melbourne.)

Lumsden L. F., Alexander J. S. A., Hill F. A. R., Krasna S. P., and Silveira C. E. (1991). The vertebrate fauna of the Land Conservation Council Melbourne-2 Study Area. Department of Conservation and Natural Resources, Heidelberg, Victoria.

Mac Nally, R. , and Brown, G. W. (2001). Reptiles and habitat fragmentation in the box–ironbark forests of central Victoria, Australia: predictions, compositional change and faunal nestedness. Oecologia 128, 116–125.
CrossRef |

Mac Nally, R. , Bennett, A. F. , and Horrocks, G. (2000). Forecasting the impacts of habitat fragmentation. Evaluation of species-specific predictions of the impact of habitat fragmentation on birds in the box–ironbark forests of central Victoria, Australia. Biological Conservation 95, 7–29.
CrossRef |

Major, R. E. , Christie, F. J. , and Gowing, G. (2001). Influence of remnant and landscape attributes on Australian woodland bird communities. Biological Conservation 102, 47–66.
CrossRef |

Manel, S. , Williams, C. H. , and Ormerod, S. J. (2001). Evaluating presence–absence models in ecology: the need to account for prevalence. Journal of Applied Ecology 38, 921–931.
CrossRef |

Manly B. F. J. (1997). ‘Randomization, Bootstrap and Monte Carlo Methods in Biology.’ 2nd edn. (Chapman and Hall: London.)

Mather, P. B. (1979). An examination of the reptile fauna of Wyperfeld National Park using pitfall trapping. The Victorian Naturalist 96, 98–101.

R Core Development Team (2003). ‘R: A Language and Environment for Statistical Computing.’ (R Foundation for Statistical Computing: Vienna.)

Rauhala, M. A. (1993). Above ground movements and new information on habitat of Aprasia parapulchella revealed by pitfall trapping. Herpetofauna 23, 30–31.

Recher, H. F. , and Lim, L. (1990). A review of current ideas of the extinction, conservation and management of Australia’s terrestrial vertebrate fauna. Proceedings of the Ecological Society of South Australia 16, 287–301.

Robinson D., and Traill B. J. (1996). Conserving woodland birds in the wheat and sheep belts of southern Australia. RAOU Conservation Statement (Supplement to Wingspan Vol. 6 No. 2) 10, 1–16.

Sarre, S. (1995). Size and structure of populations of Oedura reticulata (Reptilia: Gekkonidae) in woodland remnants: implications for the future regional distribution of a currently common species. Australian Journal of Ecology 20, 288–298.
CrossRef |

Shine, R. (1987). Intraspecific variation in thermoregulation, movements and habitat use by Australian blacksnakes, Pseudechis porphyriacus (Elapidae). Journal of Herpetology 21, 165–177.
CrossRef |

Smith, G. T. , Arnold, G. W. , Sarre, S. , Abensperg-Traun, M. , and Steven, D. E. (1996). The effects of habitat fragmentation and livestock-grazing on animal communities in remnants of gimlet Eucalyptus salubris woodland in the Western Australian wheatbelt. II. Lizards. Journal of Applied Ecology 33, 1302–1310.
CrossRef |

Sutherland, W. J. , Armstrong-Brown, S. , Armsworth, P. R. , Tom, B. , and Brickland, J. , et al. (2006). The identification of 100 ecological questions of high policy relevance in the UK. Journal of Applied Ecology 43, 617–627.
CrossRef |

van der Ree, R. (2002). The population ecology of the squirrel glider (Petaurus norfolcensis) within a network of remnant linear habitats. Wildlife Research 29, 329–340.
CrossRef |

van der Ree, R. , and Bennett, A. F. (2001). Woodland remnants along roadsides – a reflection of pre-European structure in temperate woodlands? Ecological Management & Restoration 2, 226–228.

Welsh, H. H. , Hodgson, G. R. , and Lind, A. J. (2005). Ecogeography of the herpetofauna of a northern California watershed: linking species patterns to landscape processes. Ecography 28, 521–536.
CrossRef |

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