Pollinators and predators at home and away: Do they determine invasion success for Australian Acacia in New Zealand?

Lizzie WANDRAG, Andrew Sheppard, Richard DUNCAN, Philip Hulme

    Research output: Contribution to journalArticle

    Abstract

    Aim: Interactions with pollinators and pre-dispersal seed predators are important determinants of reproductive output and could influence the success of plant species introduced to areas outside their native range. We identified the role of these interactions in determining reproductive output and invasion outcomes for species of Australian Acacia introduced to New Zealand. Location: Australia and New Zealand. Methods: We studied three species of Australian Acacia with different invasion success in New Zealand. In both Australia and New Zealand, we measured pollination success as the number of pods per inflorescence and the proportion of aborted seeds per pod, determined losses to pre-dispersal seed predators, and measured overall seed output. For each species, we compared performance in New Zealand with that in Australia, then examined whether there was any variation among species in their relative performance in each country. Results: The number of pods per inflorescence and proportion of seeds aborted were similar in each country and among species. There was little difference in pre-dispersal seed predation rate between Australia and New Zealand for Acacia dealbata, an invasive species, and Acacia baileyana, a species widely naturalized in New Zealand. However, pre-dispersal seed predation rate was lower in New Zealand for Acacia pravissima, currently considered to be a casual species there. Both the invasive A. dealbata and the casual A. pravissima produced more seeds per tree in New Zealand than Australia. Main conclusions: Differences in reproductive success between the native and introduced range could not explain the differences in invasion success among the three Acacia species. Although per capita reproductive output was higher in New Zealand for two species, neither mutualistic interactions with pollinators nor antagonistic interactions with pre-dispersal seed predators explained those differences. The high seed output of A. pravissima suggests it has the potential to become invasive. These findings highlight the value of broad comparative studies in elucidating the drivers of invasion.
    Original languageEnglish
    Pages (from-to)619-629
    Number of pages11
    JournalJournal of Biogeography
    Volume42
    Issue number4
    DOIs
    Publication statusPublished - 2015

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    colonizing ability
    Acacia
    pollinator
    pollinators
    predator
    predators
    Acacia dealbata
    seed dispersal
    seed abortion
    pods
    reproductive performance
    seed predation
    seed
    inflorescences
    seeds
    invasive species
    pollination
    reproductive success
    comparative study

    Cite this

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    title = "Pollinators and predators at home and away: Do they determine invasion success for Australian Acacia in New Zealand?",
    abstract = "Aim: Interactions with pollinators and pre-dispersal seed predators are important determinants of reproductive output and could influence the success of plant species introduced to areas outside their native range. We identified the role of these interactions in determining reproductive output and invasion outcomes for species of Australian Acacia introduced to New Zealand. Location: Australia and New Zealand. Methods: We studied three species of Australian Acacia with different invasion success in New Zealand. In both Australia and New Zealand, we measured pollination success as the number of pods per inflorescence and the proportion of aborted seeds per pod, determined losses to pre-dispersal seed predators, and measured overall seed output. For each species, we compared performance in New Zealand with that in Australia, then examined whether there was any variation among species in their relative performance in each country. Results: The number of pods per inflorescence and proportion of seeds aborted were similar in each country and among species. There was little difference in pre-dispersal seed predation rate between Australia and New Zealand for Acacia dealbata, an invasive species, and Acacia baileyana, a species widely naturalized in New Zealand. However, pre-dispersal seed predation rate was lower in New Zealand for Acacia pravissima, currently considered to be a casual species there. Both the invasive A. dealbata and the casual A. pravissima produced more seeds per tree in New Zealand than Australia. Main conclusions: Differences in reproductive success between the native and introduced range could not explain the differences in invasion success among the three Acacia species. Although per capita reproductive output was higher in New Zealand for two species, neither mutualistic interactions with pollinators nor antagonistic interactions with pre-dispersal seed predators explained those differences. The high seed output of A. pravissima suggests it has the potential to become invasive. These findings highlight the value of broad comparative studies in elucidating the drivers of invasion.",
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    Pollinators and predators at home and away: Do they determine invasion success for Australian Acacia in New Zealand? / WANDRAG, Lizzie; Sheppard, Andrew; DUNCAN, Richard; Hulme, Philip.

    In: Journal of Biogeography, Vol. 42, No. 4, 2015, p. 619-629.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - WANDRAG, Lizzie

    AU - Sheppard, Andrew

    AU - DUNCAN, Richard

    AU - Hulme, Philip

    PY - 2015

    Y1 - 2015

    N2 - Aim: Interactions with pollinators and pre-dispersal seed predators are important determinants of reproductive output and could influence the success of plant species introduced to areas outside their native range. We identified the role of these interactions in determining reproductive output and invasion outcomes for species of Australian Acacia introduced to New Zealand. Location: Australia and New Zealand. Methods: We studied three species of Australian Acacia with different invasion success in New Zealand. In both Australia and New Zealand, we measured pollination success as the number of pods per inflorescence and the proportion of aborted seeds per pod, determined losses to pre-dispersal seed predators, and measured overall seed output. For each species, we compared performance in New Zealand with that in Australia, then examined whether there was any variation among species in their relative performance in each country. Results: The number of pods per inflorescence and proportion of seeds aborted were similar in each country and among species. There was little difference in pre-dispersal seed predation rate between Australia and New Zealand for Acacia dealbata, an invasive species, and Acacia baileyana, a species widely naturalized in New Zealand. However, pre-dispersal seed predation rate was lower in New Zealand for Acacia pravissima, currently considered to be a casual species there. Both the invasive A. dealbata and the casual A. pravissima produced more seeds per tree in New Zealand than Australia. Main conclusions: Differences in reproductive success between the native and introduced range could not explain the differences in invasion success among the three Acacia species. Although per capita reproductive output was higher in New Zealand for two species, neither mutualistic interactions with pollinators nor antagonistic interactions with pre-dispersal seed predators explained those differences. The high seed output of A. pravissima suggests it has the potential to become invasive. These findings highlight the value of broad comparative studies in elucidating the drivers of invasion.

    AB - Aim: Interactions with pollinators and pre-dispersal seed predators are important determinants of reproductive output and could influence the success of plant species introduced to areas outside their native range. We identified the role of these interactions in determining reproductive output and invasion outcomes for species of Australian Acacia introduced to New Zealand. Location: Australia and New Zealand. Methods: We studied three species of Australian Acacia with different invasion success in New Zealand. In both Australia and New Zealand, we measured pollination success as the number of pods per inflorescence and the proportion of aborted seeds per pod, determined losses to pre-dispersal seed predators, and measured overall seed output. For each species, we compared performance in New Zealand with that in Australia, then examined whether there was any variation among species in their relative performance in each country. Results: The number of pods per inflorescence and proportion of seeds aborted were similar in each country and among species. There was little difference in pre-dispersal seed predation rate between Australia and New Zealand for Acacia dealbata, an invasive species, and Acacia baileyana, a species widely naturalized in New Zealand. However, pre-dispersal seed predation rate was lower in New Zealand for Acacia pravissima, currently considered to be a casual species there. Both the invasive A. dealbata and the casual A. pravissima produced more seeds per tree in New Zealand than Australia. Main conclusions: Differences in reproductive success between the native and introduced range could not explain the differences in invasion success among the three Acacia species. Although per capita reproductive output was higher in New Zealand for two species, neither mutualistic interactions with pollinators nor antagonistic interactions with pre-dispersal seed predators explained those differences. The high seed output of A. pravissima suggests it has the potential to become invasive. These findings highlight the value of broad comparative studies in elucidating the drivers of invasion.

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    DO - 10.1111/jbi.12455

    M3 - Article

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    SP - 619

    EP - 629

    JO - Journal of Biogeography

    JF - Journal of Biogeography

    SN - 0305-0270

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    ER -