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Livestock grazing affects habitat quality and persistence of the threatened Purple-crowned Fairy-wren Malurus coronatus in the Victoria River District, Northern Territory, Australia

van Doorn, Annemarie, Woinarski, John C. Z. and Werner, Patricia A. (2015). Livestock grazing affects habitat quality and persistence of the threatened Purple-crowned Fairy-wren Malurus coronatus in the Victoria River District, Northern Territory, Australia. Emu: austral ornithology,115(4):302-308.

Document type: Journal Article
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IRMA ID 81144320xPUB84
Title Livestock grazing affects habitat quality and persistence of the threatened Purple-crowned Fairy-wren Malurus coronatus in the Victoria River District, Northern Territory, Australia
Author van Doorn, Annemarie
Woinarski, John C. Z.
Werner, Patricia A.
Journal Name Emu: austral ornithology
Publication Date 2015
Volume Number 115
Issue Number 4
ISSN 0158-4197   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84946827015
Start Page 302
End Page 308
Total Pages 7
Place of Publication Australia
Publisher C S I R O Publishing
Field of Research 0608 - Zoology
HERDC Category C1 - Journal Article (DIISR)
Abstract The western subspecies of the Purple-crowned Fairy-wren (Malurus coronatus coronatus) is listed as vulnerable under Commonwealth and Northern Territory legislation. Declines in numbers are presumed to be due to loss and degradation of riparian habitats upon which it depends. In the Northern Territory portion of its range, the species nests, and mainly forages, in dense stands of tall River Grass (Chionachne cyathopoda). We examined the characteristics of River Grass-dominated habitats and wren group sizes, persistence and reproductive success at five sites in the Victoria River District (VRD), over a 3-year period (2000–2003). Sites spanned a range of cattle grazing intensity and history. River Grass height was greatest and frequency of bare ground the least at sites with the lowest grazing pressure. The persistence of adult fairy-wrens was greater in ungrazed than in grazed sites. In the second year of the study, high densities of cattle were (unexpectedly) introduced to one of the designated ungrazed sites (Coolibah), allowing for a before-after-control-impact study. After cattle introduction, at Coolibah mean group size of fairy-wrens declined (from 3.0 to 2.2) and year-to-year persistence of adults declined severely (from 89% to 24%), whereas on ungrazed sites, mean group size increased or remained constant and persistence of adults remained unchanged over the same period. This study demonstrates that grazing by cattle in the VRD riparian habitats detrimentally affects habitat quality and some population parameters for Purple-crowned Fairy-wrens. We suggest that these effects have potential long-term negative effects on the status of this vulnerable subspecies.
Keywords breeding success
conservation
disturbance
Gregory/Judbarra National Park
habitat degradation
riparian
DOI http://dx.doi.org/10.1071/MU14073   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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