Estimating wildlife population trends: the case of the Helmeted Honeyeater

    Research output: Contribution to journalArticle

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    Abstract

    Assessing trends in wildlife populations involves estimating whether those populations are stable, increasing or decreasing, and trends can infer the success or failure of management. This paper determines trends in a population of critically endangered Helmeted Honeyeaters (Lichenostomus melanops cassidix) in Victoria, Australia, using a range of estimation procedures. Analyses of breeding pairs data show the population of Helmeted Honeyeaters increased, with an annual finite growth rate (l) of 1.07 (95% confidence intervals 1.02–1.12), over 8 years (1989–90 to 1996–97) then decreased over 12 years (1997–98 to 2008–09) with l of 0.94 (95% CI 0.91–0.96). Demographic analysis estimated that during the first 8 years l was 1.21 (95% CI 1.01–1.40), which overlapped the estimate of l from breeding pairs data but was less precise. There were no demographic data for the later period of 12 years. The number of breeding pairs in 1 year was positively, although only weakly (R2 = 0.23), and significantly (P = 0.03) related to annual rainfall 2 years prior. Wildlife management, such as that of Helmeted Honeyeaters, needs ongoing, quantitative assessment of trends involving measures such as l, with associated 95% CI.
    Original languageEnglish
    Pages (from-to)191-196
    Number of pages6
    JournalEmu: austral ornithology
    Volume114
    Issue number3
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    wildlife
    breeding
    demographic statistics
    Victoria (Australia)
    wildlife management
    confidence interval
    rain
    rainfall
    Lichenostomus melanops cassidix
    population trend
    trend

    Cite this

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    title = "Estimating wildlife population trends: the case of the Helmeted Honeyeater",
    abstract = "Assessing trends in wildlife populations involves estimating whether those populations are stable, increasing or decreasing, and trends can infer the success or failure of management. This paper determines trends in a population of critically endangered Helmeted Honeyeaters (Lichenostomus melanops cassidix) in Victoria, Australia, using a range of estimation procedures. Analyses of breeding pairs data show the population of Helmeted Honeyeaters increased, with an annual finite growth rate (l) of 1.07 (95{\%} confidence intervals 1.02–1.12), over 8 years (1989–90 to 1996–97) then decreased over 12 years (1997–98 to 2008–09) with l of 0.94 (95{\%} CI 0.91–0.96). Demographic analysis estimated that during the first 8 years l was 1.21 (95{\%} CI 1.01–1.40), which overlapped the estimate of l from breeding pairs data but was less precise. There were no demographic data for the later period of 12 years. The number of breeding pairs in 1 year was positively, although only weakly (R2 = 0.23), and significantly (P = 0.03) related to annual rainfall 2 years prior. Wildlife management, such as that of Helmeted Honeyeaters, needs ongoing, quantitative assessment of trends involving measures such as l, with associated 95{\%} CI.",
    keywords = "conservation, endangered subspecies, finite growth rate, monitoring, population growth rate, trends in abundance.",
    author = "Jim HONE",
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    language = "English",
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    pages = "191--196",
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    Estimating wildlife population trends: the case of the Helmeted Honeyeater. / HONE, Jim.

    In: Emu: austral ornithology, Vol. 114, No. 3, 2014, p. 191-196.

    Research output: Contribution to journalArticle

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    AB - Assessing trends in wildlife populations involves estimating whether those populations are stable, increasing or decreasing, and trends can infer the success or failure of management. This paper determines trends in a population of critically endangered Helmeted Honeyeaters (Lichenostomus melanops cassidix) in Victoria, Australia, using a range of estimation procedures. Analyses of breeding pairs data show the population of Helmeted Honeyeaters increased, with an annual finite growth rate (l) of 1.07 (95% confidence intervals 1.02–1.12), over 8 years (1989–90 to 1996–97) then decreased over 12 years (1997–98 to 2008–09) with l of 0.94 (95% CI 0.91–0.96). Demographic analysis estimated that during the first 8 years l was 1.21 (95% CI 1.01–1.40), which overlapped the estimate of l from breeding pairs data but was less precise. There were no demographic data for the later period of 12 years. The number of breeding pairs in 1 year was positively, although only weakly (R2 = 0.23), and significantly (P = 0.03) related to annual rainfall 2 years prior. Wildlife management, such as that of Helmeted Honeyeaters, needs ongoing, quantitative assessment of trends involving measures such as l, with associated 95% CI.

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