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The recovery of populations of bush rat Rattus fuscipes in forest fragments following major population reduction
Article first published online: 1 JUN 2005
DOI: 10.1111/j.1365-2664.2005.01054.x
1365-2664/asset/cover.gif?v=1&s=4510998017eb804e0bc24f63389b75ebb87101b7 "Journal of Applied Ecology")
Additional Information
How to Cite
LINDENMAYER, D. B., CUNNINGHAM, R. B. and PEAKALL, R. (2005), The recovery of populations of bush rat Rattus fuscipes in forest fragments following major population reduction. Journal of Applied Ecology, 42: 649–658. doi: 10.1111/j.1365-2664.2005.01054.x
Publication History
- Issue published online: 13 JUN 2005
- Article first published online: 1 JUN 2005
- Received 31 January 2005; final copy received 16 March 2005 Editor: Steve Rushton
Keywords:
- disturbance regimes;
- genetic-tagging;
- fragmentation;
- manipulative experiment;
- population depletion;
- population genetics;
- population recovery;
- small mammals
Summary
- 1Understanding the recovery of populations after disturbance is critical to many aspects of applied population management, ranging from the development of conservation strategies to pest control. We used a controlled and replicated field experiment linked to a genetic study to examine the rate and mechanism of population recovery of the Australian bush rat after severe experimental population reduction.
- 2The main factors examined were perturbation treatment (removal of animals, removal followed by restocking, no removal), patch size and patch isolation. Although large numbers of animals were removed from many patches, on average populations recovered to pretreatment levels within 2 years. Populations rebounded to levels that appeared to approximate patch carrying capacity. Initially small populations recovered to a small size and those that were large were also large 24 months later. No significant relationships between population recovery and patch size and isolation were identified.
- 3There was an effect of initial population size on proportional trapping success: a higher proportion of initially large populations was trapped than smaller ones.
- 4Genetic analyses revealed a significant genetic change following experimental perturbation. Rapid population recovery was mostly via residual animals (and their offspring) that escaped capture, rather than colonization from neighbouring populations.
- 5Synthesis and applications. This study has implications for vegetation and habitat management in fragmented landscapes where disturbances such as fire occur. Parts of a habitat fragment that escape disturbance, or are partially disturbed, may continue to support suitable habitat and be a source of animals, thereby facilitating population recovery. Post-disturbance human activities (e.g. salvage harvesting of fire-damaged trees) can modify refugial habitats and, in turn, impair population recovery and species persistence in fragmented landscapes. These activities require careful management to ensure biota are not negatively impacted.