Dietary changes in response to population reduction in the possum Trichosurus vulpecula in New Zealand

Peter Sweetapple, Wendy RUSCOE, Graham Nugent

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Context. Efforts to protect or restore degraded plant communities by population control of invasive herbivores frequently fail to achieve their goals. Aims. We seek to quantify changes in diet of an introduced herbivore, the brushtail possum (Trichosurus vulpecula), following population control, and determine how these may contribute to variable responses in plant condition. Methods. Stomach contents of possums from five areas of indigenous forest in northern New Zealand were analysed to measure diet before and after the application of possum control. Key results. The contribution of fruit, and foliage of some early successional forest species, to total possum diet increased up to 27-fold following possum population control. This was accompanied by declines in consumption of the main precontrol possum foods (foliage from common canopy trees). Dietary changes were a combination of an immediate response to control (1 year) and a strengthening of these initial changes with increasing time since control. Conclusions. Possums in the study areas changed diet following population control, from a diet dominated by foliage of common canopy tree species to one dominated by fruits, and foliage of uncommon early successional plants. Pest control instantaneously increased the per capita availability of all foods, and probably permitted absolute increases in some foods through plant recovery, enabling possums to substitute scarce, high-preference foods for abundant but less preferred canopy foliage. Implications. Following control of a pest herbivore, dietary changes reduce benefits for the most vulnerable preferred plant foods, but enhance benefits for less favoured plants. Intense pest control can permit some recovery of highly preferred foods, despite increased per capita consumption of these foods by survivors of control.
    Original languageEnglish
    Pages (from-to)561-569
    Number of pages9
    JournalWildlife Research
    Volume40
    DOIs
    Publication statusPublished - 2013

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    Trichosurus vulpecula
    foliage
    food
    diet
    herbivore
    pest control
    canopy
    herbivores
    leaves
    fruit
    food plants
    per capita food consumption
    food preference
    stomach content
    fruits
    possums
    plant community
    food choices
    fold
    plant response

    Cite this

    Sweetapple, Peter ; RUSCOE, Wendy ; Nugent, Graham. / Dietary changes in response to population reduction in the possum Trichosurus vulpecula in New Zealand. In: Wildlife Research. 2013 ; Vol. 40. pp. 561-569.
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    abstract = "Context. Efforts to protect or restore degraded plant communities by population control of invasive herbivores frequently fail to achieve their goals. Aims. We seek to quantify changes in diet of an introduced herbivore, the brushtail possum (Trichosurus vulpecula), following population control, and determine how these may contribute to variable responses in plant condition. Methods. Stomach contents of possums from five areas of indigenous forest in northern New Zealand were analysed to measure diet before and after the application of possum control. Key results. The contribution of fruit, and foliage of some early successional forest species, to total possum diet increased up to 27-fold following possum population control. This was accompanied by declines in consumption of the main precontrol possum foods (foliage from common canopy trees). Dietary changes were a combination of an immediate response to control (1 year) and a strengthening of these initial changes with increasing time since control. Conclusions. Possums in the study areas changed diet following population control, from a diet dominated by foliage of common canopy tree species to one dominated by fruits, and foliage of uncommon early successional plants. Pest control instantaneously increased the per capita availability of all foods, and probably permitted absolute increases in some foods through plant recovery, enabling possums to substitute scarce, high-preference foods for abundant but less preferred canopy foliage. Implications. Following control of a pest herbivore, dietary changes reduce benefits for the most vulnerable preferred plant foods, but enhance benefits for less favoured plants. Intense pest control can permit some recovery of highly preferred foods, despite increased per capita consumption of these foods by survivors of control.",
    keywords = "diet, impact mitigation, invasive herbivore, population control.",
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    Dietary changes in response to population reduction in the possum Trichosurus vulpecula in New Zealand. / Sweetapple, Peter; RUSCOE, Wendy; Nugent, Graham.

    In: Wildlife Research, Vol. 40, 2013, p. 561-569.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Dietary changes in response to population reduction in the possum Trichosurus vulpecula in New Zealand

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    AU - RUSCOE, Wendy

    AU - Nugent, Graham

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    N2 - Context. Efforts to protect or restore degraded plant communities by population control of invasive herbivores frequently fail to achieve their goals. Aims. We seek to quantify changes in diet of an introduced herbivore, the brushtail possum (Trichosurus vulpecula), following population control, and determine how these may contribute to variable responses in plant condition. Methods. Stomach contents of possums from five areas of indigenous forest in northern New Zealand were analysed to measure diet before and after the application of possum control. Key results. The contribution of fruit, and foliage of some early successional forest species, to total possum diet increased up to 27-fold following possum population control. This was accompanied by declines in consumption of the main precontrol possum foods (foliage from common canopy trees). Dietary changes were a combination of an immediate response to control (1 year) and a strengthening of these initial changes with increasing time since control. Conclusions. Possums in the study areas changed diet following population control, from a diet dominated by foliage of common canopy tree species to one dominated by fruits, and foliage of uncommon early successional plants. Pest control instantaneously increased the per capita availability of all foods, and probably permitted absolute increases in some foods through plant recovery, enabling possums to substitute scarce, high-preference foods for abundant but less preferred canopy foliage. Implications. Following control of a pest herbivore, dietary changes reduce benefits for the most vulnerable preferred plant foods, but enhance benefits for less favoured plants. Intense pest control can permit some recovery of highly preferred foods, despite increased per capita consumption of these foods by survivors of control.

    AB - Context. Efforts to protect or restore degraded plant communities by population control of invasive herbivores frequently fail to achieve their goals. Aims. We seek to quantify changes in diet of an introduced herbivore, the brushtail possum (Trichosurus vulpecula), following population control, and determine how these may contribute to variable responses in plant condition. Methods. Stomach contents of possums from five areas of indigenous forest in northern New Zealand were analysed to measure diet before and after the application of possum control. Key results. The contribution of fruit, and foliage of some early successional forest species, to total possum diet increased up to 27-fold following possum population control. This was accompanied by declines in consumption of the main precontrol possum foods (foliage from common canopy trees). Dietary changes were a combination of an immediate response to control (1 year) and a strengthening of these initial changes with increasing time since control. Conclusions. Possums in the study areas changed diet following population control, from a diet dominated by foliage of common canopy tree species to one dominated by fruits, and foliage of uncommon early successional plants. Pest control instantaneously increased the per capita availability of all foods, and probably permitted absolute increases in some foods through plant recovery, enabling possums to substitute scarce, high-preference foods for abundant but less preferred canopy foliage. Implications. Following control of a pest herbivore, dietary changes reduce benefits for the most vulnerable preferred plant foods, but enhance benefits for less favoured plants. Intense pest control can permit some recovery of highly preferred foods, despite increased per capita consumption of these foods by survivors of control.

    KW - diet

    KW - impact mitigation

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    KW - population control.

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    SN - 1035-3712

    ER -