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

A van Doorn, John Casimir Zichy-Woinarski, Patricia A Werner

    Research output: Contribution to journalArticleResearchpeer-review

    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.
    Original languageEnglish
    Pages (from-to)302-308
    Number of pages7
    JournalEmu
    Volume115
    Issue number4
    DOIs
    Publication statusPublished - 26 Aug 2015

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    Victoria (Australia)
    Northern Territory
    habitat quality
    Troglodytidae
    livestock
    persistence
    grazing
    group size
    Poaceae
    cattle
    rivers
    habitats
    river
    grass
    subspecies
    habitat
    grazing intensity
    laws and regulations
    Commonwealth of Nations
    grazing pressure

    Cite this

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    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",
    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 = "bird, cattle, disturbance, endangered species, group size, habitat fragmentation, habitat loss, habitat quality, persistence, population decline, reproductive success, spatiotemporal analysis, vulnerability, Australia, Gregory National Park, Northern Territory, Victoria River, Bos, Chionachne cyathopoda, Malurus coronatus, Troglodytinae",
    author = "{van Doorn}, A and Zichy-Woinarski, {John Casimir} and Werner, {Patricia A}",
    year = "2015",
    month = "8",
    day = "26",
    doi = "10.1071/MU14073",
    language = "English",
    volume = "115",
    pages = "302--308",
    journal = "Emu",
    issn = "0158-4197",
    publisher = "CSIRO Publishing",
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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, A; Zichy-Woinarski, John Casimir; Werner, Patricia A.

    In: Emu, Vol. 115, No. 4, 26.08.2015, p. 302-308.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Livestock grazing affects habitat quality and persistence of the threatened Purple-crowned Fairy-wren Malurus coronatus in the Victoria River District, Northern Territory, Australia

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    AU - Zichy-Woinarski, John Casimir

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    N2 - 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.

    AB - 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.

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    KW - persistence

    KW - population decline

    KW - reproductive success

    KW - spatiotemporal analysis

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    KW - Australia

    KW - Gregory National Park

    KW - Northern Territory

    KW - Victoria River

    KW - Bos

    KW - Chionachne cyathopoda

    KW - Malurus coronatus

    KW - Troglodytinae

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