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

Driscoll, Don; Whitehead, Catherine A.; Lazzari, Juliana

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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...[Show more]

dc.contributor.authorDriscoll, Don
dc.contributor.authorWhitehead, Catherine A.
dc.contributor.authorLazzari, Juliana
dc.date.accessioned2015-12-10T23:26:51Z
dc.identifier.issn0921-2973
dc.identifier.urihttp://hdl.handle.net/1885/67959
dc.description.abstractIn 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.
dc.publisherKluwer Academic Publishers
dc.sourceLandscape Ecology
dc.subjectKeywords: abundance; agricultural land; connectivity; dispersal; fire; grass; habitat fragmentation; habitat loss; invasive species; lizard; local extinction; metapopulation; persistence; population decline; reintroduction; spatial analysis; species occurrence; suc Invasive weeds; Land clearing; Metacommunity; Patch-matrix model; Reptile
dc.titleSpatial dynamics of the knob-tailed gecko Nephrurus stellatus in a fragmented agricultural landscape
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume27
dc.date.issued2012
local.identifier.absfor050104 - Landscape Ecology
local.identifier.absfor060207 - Population Ecology
local.identifier.ariespublicationf5625xPUB1574
local.type.statusPublished Version
local.contributor.affiliationDriscoll, Don, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationWhitehead, Catherine A., Flinders University
local.contributor.affiliationLazzari, Juliana, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue6
local.bibliographicCitation.startpage829
local.bibliographicCitation.lastpage841
local.identifier.doi10.1007/s10980-012-9734-3
local.identifier.absseo960899 - Flora, Fauna and Biodiversity of environments not elsewhere classified
dc.date.updated2016-02-24T08:48:32Z
local.identifier.scopusID2-s2.0-84862153614
local.identifier.thomsonID000305218000004
CollectionsANU Research Publications

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