Spatial dynamics of the knob-tailed gecko Nephrurus stellatus in a fragmented agricultural landscape

Driscoll, Don A, Whitehead, Catherine A and Lazzari, Juliana 2012, Spatial dynamics of the knob-tailed gecko Nephrurus stellatus in a fragmented agricultural landscape, Landscape ecology, vol. 27, no. 6, pp. 829-841, doi: 10.1007/s10980-012-9734-3.

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Title Spatial dynamics of the knob-tailed gecko Nephrurus stellatus in a fragmented agricultural landscape
Author(s) Driscoll, Don AORCID iD for Driscoll, Don A orcid.org/0000-0002-1560-5235
Whitehead, Catherine A
Lazzari, Juliana
Journal name Landscape ecology
Volume number 27
Issue number 6
Start page 829
End page 841
Total pages 13
Publisher Springer
Place of publication Amsterdam, The Netherlands
Publication date 2012-07
ISSN 0921-2973
1572-9761
Keyword(s) Metacommunity
Reptile
Patch-matrix model
Invasive weeds
Land clearing
Summary In fragmented landscapes, a species' dispersal ability and response to habitat condition are key determinants of persistence. To understand the relative importance of dispersal and condition for survival of Nephrurus stellatus (Gekkonidae) in southern Australia, we surveyed 92 woodland remnants three times. This gecko favours early post-fire succession conditions so may be at risk of extinction in the long-unburnt agricultural landscape. Using N-mixture models, we compared the influence of four measures of isolation, patch area and two habitat variables on the abundance and occurrence of N. stellatus, while taking into account detection probability. Patch occupancy was high, despite the long-term absence of fire from most remnants. Distance to the nearest occupied site was the most informative measure of patch isolation, exhibiting a negative relationship with occupancy. Distance to a nearby conservation park had little influence, suggesting that mainland-island metapopulation dynamics are not important. Abundance and occurrence were positively related to %-cover of spinifex (Triodia), indicating that niche-related factors may also contribute to spatial dynamics. Patterns of patch occupancy imply that N. stellatus has a sequence of spatial dynamics across an isolation gradient, with patchy populations and source-sink dynamics when patches are within 300 m, metapopulations at intermediate isolation, and declining populations when patches are separated by >1-2 km. Considering the conservation needs of the community, habitat condition and connectivity may need to be improved before fire can be reintroduced to the landscape. We speculate that fire may interact with habitat degradation and isolation, increasing the risk of local extinctions.
Language eng
DOI 10.1007/s10980-012-9734-3
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, Springer Science+Business Media B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078719

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