Abstract
Context
Multiple ecological drivers generate spatial patterns in species’ distributions. Changes to natural disturbance regimes can place early successional habitat specialists at an increased risk of extinction by altering landscape patterns of habitat suitability.
Objectives
We developed a series of hypotheses to evaluate the effects of landscape structure, fire history, and site-level habitat quality on site occupancy by an early successional specialist, the eastern chestnut mouse (Pseudomys gracilicaudatus).
Methods
We obtained eight years of monitoring data from 26 sites in recently burned heathland in southeast Australia. We used generalised linear models to determine which explanatory variables were related to occupancy. We also explored predictability in patterns of small mammal species co-occurrence.
Results
Landscape structure (patch area, landscape heterogeneity) was strongly related to site occupancy. Site occupancy was associated with dead shrubs in the understory and rock cover on ground layer, but was not directly influenced by recent or historical fire. Contrary to contemporary ecological theory, we found no predictable species associations in our early successional community.
Conclusions
We recommend surveys take account of landscape configuration and proximity to suitable habitat for optimal results. Fire regimes expected to promote eastern chestnut mouse population growth should encourage the retention of critical habitat features rather than be based on temporal rates of successional stages. For management to adequately account for post-disturbance patterns in early successional communities, a species-by-species, multi-scaled approach to research is necessary.
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Acknowledgments
We most gratefully acknowledge the Wreck Bay Aboriginal Community and the Wandandian People of the Dharawal and Dhurga language groups on whose lands this study was conducted. Mason Crane, Damien Michael, Rebecca Montague-Drake, and Sachiko Okada provided fieldwork assistance. This project is part of a major study in Booderee National Park funded by the Australian Research Council, the Department of Environment and Water Resources and the Department of Defence.
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Pereoglou, F., MacGregor, C., Banks, S.C. et al. Landscape, fire and habitat: which features of recently burned heathland influence site occupancy of an early successional specialist?. Landscape Ecol 31, 255–269 (2016). https://doi.org/10.1007/s10980-015-0240-2
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DOI: https://doi.org/10.1007/s10980-015-0240-2