Estimating density-dependent impacts of European rabbits on Australian tree and shrub populations

Greg Mutze, Brian Cooke, Scott Jennings

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Introduced European rabbits, Oryctolagus cuniculus, can severely damage Australian native vegetation but the problem is difficult to quantify because simple methods to estimate rabbit impacts are lacking. Management decision-making is often uncertain because of unknown relationships between rabbit density and damage. We tested simple quantitative sampling methods using belt transects to detect differences in critical characteristics of perennial vegetation communities affected by rabbit browsing: damage to individual juvenile shrubs and trees, and loss of recruitment cohorts. Rabbit density and relative abundance of larger herbivores were estimated from dung pellet density. The prevalence of identifiable rabbit browse on juvenile plants increased with increasing rabbit density and was higher for plant species considered by previous authors to be highly palatable than for moderately palatable or unpalatable species. At densities of =0.5rabbitsha-1, highly palatable plant species were severely damaged as juveniles and cohorts in 0.3-1.0m height classes and 5-20mm basal diameter classes were missing. Similar damage became apparent in moderately palatable species at 2rabbitsha-1 but was rarely seen in unpalatable species. Within species, size cohort evenness was inversely related to the proportion of surviving juveniles with identifiable rabbit damage. The effect of rabbits on native vegetation condition can be recorded in a simple manner suitable for identifying density-damage relationships and changes in vegetation condition over time. It is particularly useful in setting target densities below which rabbits must be managed to maintain natural plant recruitment and ecosystem function in conservation reserves and pastoral grazing properties of southern Australia.
    Original languageEnglish
    Pages (from-to)142-152
    Number of pages11
    JournalAustralian Journal of Botany
    Volume64
    Issue number2
    DOIs
    Publication statusPublished - 2016

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    shrub
    shrubs
    rabbits
    damage
    vegetation
    browsing
    ecosystem function
    relative abundance
    herbivore
    Oryctolagus cuniculus
    transect
    grazing
    decision making
    pellets
    conservation areas
    herbivores
    sampling
    feces
    ecosystems
    methodology

    Cite this

    Mutze, Greg ; Cooke, Brian ; Jennings, Scott. / Estimating density-dependent impacts of European rabbits on Australian tree and shrub populations. In: Australian Journal of Botany. 2016 ; Vol. 64, No. 2. pp. 142-152.
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    Estimating density-dependent impacts of European rabbits on Australian tree and shrub populations. / Mutze, Greg; Cooke, Brian; Jennings, Scott.

    In: Australian Journal of Botany, Vol. 64, No. 2, 2016, p. 142-152.

    Research output: Contribution to journalArticle

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