Quantifying invasion resistance: the use of recruitment functions to control for propagule pressure

Alice Miller, Jeffrey Diez, Jon Sullivan, Steven Wangen, Susan Wiser, Ross Meffin, Richard DUNCAN

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    Invasive species distributions tend to be biased towards some habitats compared to others due to the combined effects of habitat-specific resistance to invasion and non-uniform propagule pressure. These two factors may also interact, with habitat resistance varying as a function of propagule supply rate. Recruitment experiments, in which the number of individuals recruiting into a population is measured under different propagule supply rates, can help us understand these interactions and quantify habitat resistance to invasion while controlling for variation in propagule supply rate. Here, we constructed recruitment functions for the invasive herb Hieracium lepidulum by sowing seeds at five different densities into six different habitat types in New Zealand’s Southern Alps repeated over two successive years, and monitored seedling recruitment and survival over a four year period. We fitted recruitment functions that allowed us to estimate the total number of safe sites available for plants to occupy, which we used as a measure of invasion resistance, and tested several hypotheses concerning how invasion resistance differed among habitats and over time. We found significant differences in levels of H. lepidulum recruitment among habitats, which did not match the species’ current distribution in the landscape. Local biotic and abiotic characteristics helped explain some of the between-habitat variation, with vascular plant species richness, vascular plant cover, and light availability, all positively correlated with the number of safe sites for recruitment. Resistance also varied over time however, with cohorts sown in successive years showing different levels of recruitment in some habitats but not others. These results show that recruitment functions can be used to quantify habitat resistance to invasion and to identify potential mechanisms of invasion resistance.
    Original languageEnglish
    Pages (from-to)920-929
    Number of pages10
    JournalEcology
    Volume95
    Issue number4
    DOIs
    Publication statusPublished - 2014

    Fingerprint

    propagule
    habitat
    habitats
    vascular plant
    vascular plants
    Hieracium
    light availability
    sowing
    habitat type
    invasive species
    herb
    herbs
    species richness
    seedling
    biogeography
    seed
    species diversity

    Cite this

    Miller, Alice ; Diez, Jeffrey ; Sullivan, Jon ; Wangen, Steven ; Wiser, Susan ; Meffin, Ross ; DUNCAN, Richard. / Quantifying invasion resistance: the use of recruitment functions to control for propagule pressure. In: Ecology. 2014 ; Vol. 95, No. 4. pp. 920-929.
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    abstract = "Invasive species distributions tend to be biased towards some habitats compared to others due to the combined effects of habitat-specific resistance to invasion and non-uniform propagule pressure. These two factors may also interact, with habitat resistance varying as a function of propagule supply rate. Recruitment experiments, in which the number of individuals recruiting into a population is measured under different propagule supply rates, can help us understand these interactions and quantify habitat resistance to invasion while controlling for variation in propagule supply rate. Here, we constructed recruitment functions for the invasive herb Hieracium lepidulum by sowing seeds at five different densities into six different habitat types in New Zealand’s Southern Alps repeated over two successive years, and monitored seedling recruitment and survival over a four year period. We fitted recruitment functions that allowed us to estimate the total number of safe sites available for plants to occupy, which we used as a measure of invasion resistance, and tested several hypotheses concerning how invasion resistance differed among habitats and over time. We found significant differences in levels of H. lepidulum recruitment among habitats, which did not match the species’ current distribution in the landscape. Local biotic and abiotic characteristics helped explain some of the between-habitat variation, with vascular plant species richness, vascular plant cover, and light availability, all positively correlated with the number of safe sites for recruitment. Resistance also varied over time however, with cohorts sown in successive years showing different levels of recruitment in some habitats but not others. These results show that recruitment functions can be used to quantify habitat resistance to invasion and to identify potential mechanisms of invasion resistance.",
    keywords = "dose-response curve, establishment, habitat invasibility, Hieracium lepidulum, invasive species, New Zealand, safe-site limitation, seed limitation, seed-sowing experiment.",
    author = "Alice Miller and Jeffrey Diez and Jon Sullivan and Steven Wangen and Susan Wiser and Ross Meffin and Richard DUNCAN",
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    language = "English",
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    Miller, A, Diez, J, Sullivan, J, Wangen, S, Wiser, S, Meffin, R & DUNCAN, R 2014, 'Quantifying invasion resistance: the use of recruitment functions to control for propagule pressure', Ecology, vol. 95, no. 4, pp. 920-929. https://doi.org/10.1890/13-0655.1

    Quantifying invasion resistance: the use of recruitment functions to control for propagule pressure. / Miller, Alice; Diez, Jeffrey; Sullivan, Jon; Wangen, Steven; Wiser, Susan; Meffin, Ross; DUNCAN, Richard.

    In: Ecology, Vol. 95, No. 4, 2014, p. 920-929.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Quantifying invasion resistance: the use of recruitment functions to control for propagule pressure

    AU - Miller, Alice

    AU - Diez, Jeffrey

    AU - Sullivan, Jon

    AU - Wangen, Steven

    AU - Wiser, Susan

    AU - Meffin, Ross

    AU - DUNCAN, Richard

    PY - 2014

    Y1 - 2014

    N2 - Invasive species distributions tend to be biased towards some habitats compared to others due to the combined effects of habitat-specific resistance to invasion and non-uniform propagule pressure. These two factors may also interact, with habitat resistance varying as a function of propagule supply rate. Recruitment experiments, in which the number of individuals recruiting into a population is measured under different propagule supply rates, can help us understand these interactions and quantify habitat resistance to invasion while controlling for variation in propagule supply rate. Here, we constructed recruitment functions for the invasive herb Hieracium lepidulum by sowing seeds at five different densities into six different habitat types in New Zealand’s Southern Alps repeated over two successive years, and monitored seedling recruitment and survival over a four year period. We fitted recruitment functions that allowed us to estimate the total number of safe sites available for plants to occupy, which we used as a measure of invasion resistance, and tested several hypotheses concerning how invasion resistance differed among habitats and over time. We found significant differences in levels of H. lepidulum recruitment among habitats, which did not match the species’ current distribution in the landscape. Local biotic and abiotic characteristics helped explain some of the between-habitat variation, with vascular plant species richness, vascular plant cover, and light availability, all positively correlated with the number of safe sites for recruitment. Resistance also varied over time however, with cohorts sown in successive years showing different levels of recruitment in some habitats but not others. These results show that recruitment functions can be used to quantify habitat resistance to invasion and to identify potential mechanisms of invasion resistance.

    AB - Invasive species distributions tend to be biased towards some habitats compared to others due to the combined effects of habitat-specific resistance to invasion and non-uniform propagule pressure. These two factors may also interact, with habitat resistance varying as a function of propagule supply rate. Recruitment experiments, in which the number of individuals recruiting into a population is measured under different propagule supply rates, can help us understand these interactions and quantify habitat resistance to invasion while controlling for variation in propagule supply rate. Here, we constructed recruitment functions for the invasive herb Hieracium lepidulum by sowing seeds at five different densities into six different habitat types in New Zealand’s Southern Alps repeated over two successive years, and monitored seedling recruitment and survival over a four year period. We fitted recruitment functions that allowed us to estimate the total number of safe sites available for plants to occupy, which we used as a measure of invasion resistance, and tested several hypotheses concerning how invasion resistance differed among habitats and over time. We found significant differences in levels of H. lepidulum recruitment among habitats, which did not match the species’ current distribution in the landscape. Local biotic and abiotic characteristics helped explain some of the between-habitat variation, with vascular plant species richness, vascular plant cover, and light availability, all positively correlated with the number of safe sites for recruitment. Resistance also varied over time however, with cohorts sown in successive years showing different levels of recruitment in some habitats but not others. These results show that recruitment functions can be used to quantify habitat resistance to invasion and to identify potential mechanisms of invasion resistance.

    KW - dose-response curve

    KW - establishment

    KW - habitat invasibility

    KW - Hieracium lepidulum

    KW - invasive species

    KW - New Zealand

    KW - safe-site limitation

    KW - seed limitation

    KW - seed-sowing experiment.

    U2 - 10.1890/13-0655.1

    DO - 10.1890/13-0655.1

    M3 - Article

    VL - 95

    SP - 920

    EP - 929

    JO - Ecology

    JF - Ecology

    SN - 0012-9658

    IS - 4

    ER -