Do reptile responses to habitat structure and time since fire depend on landscape structure?

Land use changes, such as the development of agriculture and plantation forestry, and altered fire regimes, are major drivers of biodiversity loss worldwide, influencing the availability of suitable habitat for species. Reptiles are sensitive to both these processes as they are influenced by native vegetation extent and habitat structure. While much is known about the independent effects of fire and land use change on species distributions, few studies have investigated potential interactive effects; specifically, whether the influence of site-scale variables on reptiles depends on the properties of the surrounding landscape. We sampled reptiles at 107 sites in fire-prone heathy woodland, interspersed with plantation forestry and agriculture in south-west Victoria, Australia. We investigated the responses of seven reptile species to both site-scale variables (time since fire and several measures of habitat structure) and landscape-scale variables (extent of native vegetation and plantations and the presence of pasture within a 3.14 square km area) to 1) identify whether species’ responses to fire and habitat depended on landscape structure, and 2) examine the relative influence of time since fire, habitat structure and landscape structure on reptile abundance. We predicted that responses to site-scale variables would vary with a key landscape structure variable: the amount of native vegetation cover. Further, we predicted that site-scale variables would be stronger predictors of species abundance than landscape-scale variables. Generalised linear models, accounting for imperfect detection, were used to estimate species responses to site and landscape-scale predictors. For two species (Amphibolurus muricatus and Liopholis whitii) there was evidence that their responses to site-scale variables depended on landscape structure. However, contrary to our first prediction, native vegetation cover was not the only landscape structure variable that influenced species’ responses to site-scale variables. Three species ...