Geographic patterns and correlates of the decline of granivorous birds in northern Australia

Donald Franklin, Peter Whitehead, G Pardon, J Matthews, P McMahon, D McIntyre

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    A geographic index of the decline in the distribution and abundance of granivorous birds in tropical northern Australia shows that declines are greatest in Queensland and especially in the south-eastern tropics and in inland areas, and lowest in the north Kimberley and east Arnhem districts. In this paper, we use generalised linear models to investigate interrelationships among an index of decline in 1� by 1� cells and measures of grazing intensity and contemporary patterns of burning, together with the environmental variables of rainfall, vegetation and topographic patterning in the landscape. Grazing intensity was the single strongest human effect but strong correlations between grazing intensity and other human influences suggest that these may have been subsumed within the grazing intensity measure. Impacts of grazing may be worse where pastoral settlement occurred earlier. Topographic variation appeared to be a mitigating effect, suggesting a role for 'topographic refuges' from human activities. Relationships among granivore declines, grazing and rainfall are difficult to disentangle using inferential statistics, but a consistent effect is that declines are more severe in areas with greater year-to-year variation in rainfall. We do not suggest that our analyses are conclusive. However, they do support the proposition that better understanding of the causes of decline at finer spatial scales will emerge most strongly in studies that link habitat quality with granivore demography at inland sites of highly variable year-to-year rainfall and with strongly contrasting grazing histories. � CSIRO 2005.
    Original languageEnglish
    Pages (from-to)399-408
    Number of pages10
    JournalWildlife Research
    Volume32
    Issue number5
    Publication statusPublished - 2005

    Fingerprint

    grazing intensity
    grazing
    bird
    rain
    birds
    rainfall
    demography
    Queensland
    tropics
    statistics
    linear models
    history
    environmental factors
    vegetation
    habitat quality
    refuge
    habitats
    human activity
    cells
    granivores

    Cite this

    Franklin, D., Whitehead, P., Pardon, G., Matthews, J., McMahon, P., & McIntyre, D. (2005). Geographic patterns and correlates of the decline of granivorous birds in northern Australia. Wildlife Research, 32(5), 399-408.
    Franklin, Donald ; Whitehead, Peter ; Pardon, G ; Matthews, J ; McMahon, P ; McIntyre, D. / Geographic patterns and correlates of the decline of granivorous birds in northern Australia. In: Wildlife Research. 2005 ; Vol. 32, No. 5. pp. 399-408.
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    title = "Geographic patterns and correlates of the decline of granivorous birds in northern Australia",
    abstract = "A geographic index of the decline in the distribution and abundance of granivorous birds in tropical northern Australia shows that declines are greatest in Queensland and especially in the south-eastern tropics and in inland areas, and lowest in the north Kimberley and east Arnhem districts. In this paper, we use generalised linear models to investigate interrelationships among an index of decline in 1� by 1� cells and measures of grazing intensity and contemporary patterns of burning, together with the environmental variables of rainfall, vegetation and topographic patterning in the landscape. Grazing intensity was the single strongest human effect but strong correlations between grazing intensity and other human influences suggest that these may have been subsumed within the grazing intensity measure. Impacts of grazing may be worse where pastoral settlement occurred earlier. Topographic variation appeared to be a mitigating effect, suggesting a role for 'topographic refuges' from human activities. Relationships among granivore declines, grazing and rainfall are difficult to disentangle using inferential statistics, but a consistent effect is that declines are more severe in areas with greater year-to-year variation in rainfall. We do not suggest that our analyses are conclusive. However, they do support the proposition that better understanding of the causes of decline at finer spatial scales will emerge most strongly in studies that link habitat quality with granivore demography at inland sites of highly variable year-to-year rainfall and with strongly contrasting grazing histories. � CSIRO 2005.",
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    Franklin, D, Whitehead, P, Pardon, G, Matthews, J, McMahon, P & McIntyre, D 2005, 'Geographic patterns and correlates of the decline of granivorous birds in northern Australia', Wildlife Research, vol. 32, no. 5, pp. 399-408.

    Geographic patterns and correlates of the decline of granivorous birds in northern Australia. / Franklin, Donald; Whitehead, Peter; Pardon, G; Matthews, J; McMahon, P; McIntyre, D.

    In: Wildlife Research, Vol. 32, No. 5, 2005, p. 399-408.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - Geographic patterns and correlates of the decline of granivorous birds in northern Australia

    AU - Franklin, Donald

    AU - Whitehead, Peter

    AU - Pardon, G

    AU - Matthews, J

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    AU - McIntyre, D

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    N2 - A geographic index of the decline in the distribution and abundance of granivorous birds in tropical northern Australia shows that declines are greatest in Queensland and especially in the south-eastern tropics and in inland areas, and lowest in the north Kimberley and east Arnhem districts. In this paper, we use generalised linear models to investigate interrelationships among an index of decline in 1� by 1� cells and measures of grazing intensity and contemporary patterns of burning, together with the environmental variables of rainfall, vegetation and topographic patterning in the landscape. Grazing intensity was the single strongest human effect but strong correlations between grazing intensity and other human influences suggest that these may have been subsumed within the grazing intensity measure. Impacts of grazing may be worse where pastoral settlement occurred earlier. Topographic variation appeared to be a mitigating effect, suggesting a role for 'topographic refuges' from human activities. Relationships among granivore declines, grazing and rainfall are difficult to disentangle using inferential statistics, but a consistent effect is that declines are more severe in areas with greater year-to-year variation in rainfall. We do not suggest that our analyses are conclusive. However, they do support the proposition that better understanding of the causes of decline at finer spatial scales will emerge most strongly in studies that link habitat quality with granivore demography at inland sites of highly variable year-to-year rainfall and with strongly contrasting grazing histories. � CSIRO 2005.

    AB - A geographic index of the decline in the distribution and abundance of granivorous birds in tropical northern Australia shows that declines are greatest in Queensland and especially in the south-eastern tropics and in inland areas, and lowest in the north Kimberley and east Arnhem districts. In this paper, we use generalised linear models to investigate interrelationships among an index of decline in 1� by 1� cells and measures of grazing intensity and contemporary patterns of burning, together with the environmental variables of rainfall, vegetation and topographic patterning in the landscape. Grazing intensity was the single strongest human effect but strong correlations between grazing intensity and other human influences suggest that these may have been subsumed within the grazing intensity measure. Impacts of grazing may be worse where pastoral settlement occurred earlier. Topographic variation appeared to be a mitigating effect, suggesting a role for 'topographic refuges' from human activities. Relationships among granivore declines, grazing and rainfall are difficult to disentangle using inferential statistics, but a consistent effect is that declines are more severe in areas with greater year-to-year variation in rainfall. We do not suggest that our analyses are conclusive. However, they do support the proposition that better understanding of the causes of decline at finer spatial scales will emerge most strongly in studies that link habitat quality with granivore demography at inland sites of highly variable year-to-year rainfall and with strongly contrasting grazing histories. � CSIRO 2005.

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    KW - Australia

    KW - Eastern Hemisphere

    KW - World

    KW - Aves

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    JO - Wildlife Research

    JF - Wildlife Research

    SN - 1035-3712

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    ER -

    Franklin D, Whitehead P, Pardon G, Matthews J, McMahon P, McIntyre D. Geographic patterns and correlates of the decline of granivorous birds in northern Australia. Wildlife Research. 2005;32(5):399-408.