Mutualism vs. antagonism in introduced and native ranges: Can seed dispersal and predation determine Acacia invasion success?

Lizzie WANDRAG, Andrew Sheppard, Richard DUNCAN, P. E. Hulme

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Plant species introduced to new regions can escape their natural enemies but may also lose important mutualists. While mutualistic interactions are often considered too diffuse to limit plant invasion, few studies have quantified the strength of interactions in both the native and introduced ranges, and assessed whether any differences are linked to invasion outcomes. For three Acacia species adapted for ant dispersal (myrmecochory), we quantified seed removal probabilities associated with dispersal and predation in both the native (Australian) and introduced (New Zealand) ranges, predicting lower removal attributable to dispersal in New Zealand due to a relatively depauperate ant fauna. We used the role of the elaiosome to infer myrmecochory, and included treatments to measure vertebrate seed removal, since this may become an important determinant of seed fate in the face of reduced dispersal. We then tested whether differences in seed removal patterns could explain differences in the invasion success of the three Acacia species in New Zealand. Overall seed removal by invertebrates was lower in New Zealand relative to Australia, but the difference in removal between seeds with an elaiosome compared to those without was similar in both countries. This implies that the probability of a removed seed being dispersed by invertebrates was comparable in New Zealand to Australia. The probability of seed removal by vertebrates was similar and low in both countries. Differences in the invasive success of the three Acacia species in New Zealand were not explained by differences in levels of seed predation or the strength of myrmecochorous interactions. These findings suggest that interactions with ground foraging seed predators and dispersers are unlikely to limit the ability of Acacia species to spread in New Zealand, and could not explain their variable invasion success.
    Original languageEnglish
    Pages (from-to)171-179
    Number of pages9
    JournalPerspectives in Plant Ecology, Evolution and Systematics
    Volume15
    Issue number3
    DOIs
    Publication statusPublished - 2013

    Fingerprint

    colonizing ability
    seed predation
    mutualism
    antagonism
    seed dispersal
    Acacia
    seed
    seeds
    myrmecochory
    ant
    Formicidae
    vertebrate
    invertebrate
    invertebrates
    vertebrates
    natural enemy
    removal
    natural enemies
    predation
    fauna

    Cite this

    @article{62f51b2e940c448b8c08e776df2bfa5b,
    title = "Mutualism vs. antagonism in introduced and native ranges: Can seed dispersal and predation determine Acacia invasion success?",
    abstract = "Plant species introduced to new regions can escape their natural enemies but may also lose important mutualists. While mutualistic interactions are often considered too diffuse to limit plant invasion, few studies have quantified the strength of interactions in both the native and introduced ranges, and assessed whether any differences are linked to invasion outcomes. For three Acacia species adapted for ant dispersal (myrmecochory), we quantified seed removal probabilities associated with dispersal and predation in both the native (Australian) and introduced (New Zealand) ranges, predicting lower removal attributable to dispersal in New Zealand due to a relatively depauperate ant fauna. We used the role of the elaiosome to infer myrmecochory, and included treatments to measure vertebrate seed removal, since this may become an important determinant of seed fate in the face of reduced dispersal. We then tested whether differences in seed removal patterns could explain differences in the invasion success of the three Acacia species in New Zealand. Overall seed removal by invertebrates was lower in New Zealand relative to Australia, but the difference in removal between seeds with an elaiosome compared to those without was similar in both countries. This implies that the probability of a removed seed being dispersed by invertebrates was comparable in New Zealand to Australia. The probability of seed removal by vertebrates was similar and low in both countries. Differences in the invasive success of the three Acacia species in New Zealand were not explained by differences in levels of seed predation or the strength of myrmecochorous interactions. These findings suggest that interactions with ground foraging seed predators and dispersers are unlikely to limit the ability of Acacia species to spread in New Zealand, and could not explain their variable invasion success.",
    keywords = "Biological invasion, Density-dependence, Establishment, Exotic, Plant-animal interactions, Weed",
    author = "Lizzie WANDRAG and Andrew Sheppard and Richard DUNCAN and Hulme, {P. E.}",
    year = "2013",
    doi = "10.1016/j.ppees.2013.03.002",
    language = "English",
    volume = "15",
    pages = "171--179",
    journal = "Perspectives in Plant Ecology, Evolution and Systematics",
    issn = "1433-8319",
    publisher = "Urban und Fischer Verlag Jena",
    number = "3",

    }

    Mutualism vs. antagonism in introduced and native ranges: Can seed dispersal and predation determine Acacia invasion success? / WANDRAG, Lizzie; Sheppard, Andrew; DUNCAN, Richard; Hulme, P. E.

    In: Perspectives in Plant Ecology, Evolution and Systematics, Vol. 15, No. 3, 2013, p. 171-179.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Mutualism vs. antagonism in introduced and native ranges: Can seed dispersal and predation determine Acacia invasion success?

    AU - WANDRAG, Lizzie

    AU - Sheppard, Andrew

    AU - DUNCAN, Richard

    AU - Hulme, P. E.

    PY - 2013

    Y1 - 2013

    N2 - Plant species introduced to new regions can escape their natural enemies but may also lose important mutualists. While mutualistic interactions are often considered too diffuse to limit plant invasion, few studies have quantified the strength of interactions in both the native and introduced ranges, and assessed whether any differences are linked to invasion outcomes. For three Acacia species adapted for ant dispersal (myrmecochory), we quantified seed removal probabilities associated with dispersal and predation in both the native (Australian) and introduced (New Zealand) ranges, predicting lower removal attributable to dispersal in New Zealand due to a relatively depauperate ant fauna. We used the role of the elaiosome to infer myrmecochory, and included treatments to measure vertebrate seed removal, since this may become an important determinant of seed fate in the face of reduced dispersal. We then tested whether differences in seed removal patterns could explain differences in the invasion success of the three Acacia species in New Zealand. Overall seed removal by invertebrates was lower in New Zealand relative to Australia, but the difference in removal between seeds with an elaiosome compared to those without was similar in both countries. This implies that the probability of a removed seed being dispersed by invertebrates was comparable in New Zealand to Australia. The probability of seed removal by vertebrates was similar and low in both countries. Differences in the invasive success of the three Acacia species in New Zealand were not explained by differences in levels of seed predation or the strength of myrmecochorous interactions. These findings suggest that interactions with ground foraging seed predators and dispersers are unlikely to limit the ability of Acacia species to spread in New Zealand, and could not explain their variable invasion success.

    AB - Plant species introduced to new regions can escape their natural enemies but may also lose important mutualists. While mutualistic interactions are often considered too diffuse to limit plant invasion, few studies have quantified the strength of interactions in both the native and introduced ranges, and assessed whether any differences are linked to invasion outcomes. For three Acacia species adapted for ant dispersal (myrmecochory), we quantified seed removal probabilities associated with dispersal and predation in both the native (Australian) and introduced (New Zealand) ranges, predicting lower removal attributable to dispersal in New Zealand due to a relatively depauperate ant fauna. We used the role of the elaiosome to infer myrmecochory, and included treatments to measure vertebrate seed removal, since this may become an important determinant of seed fate in the face of reduced dispersal. We then tested whether differences in seed removal patterns could explain differences in the invasion success of the three Acacia species in New Zealand. Overall seed removal by invertebrates was lower in New Zealand relative to Australia, but the difference in removal between seeds with an elaiosome compared to those without was similar in both countries. This implies that the probability of a removed seed being dispersed by invertebrates was comparable in New Zealand to Australia. The probability of seed removal by vertebrates was similar and low in both countries. Differences in the invasive success of the three Acacia species in New Zealand were not explained by differences in levels of seed predation or the strength of myrmecochorous interactions. These findings suggest that interactions with ground foraging seed predators and dispersers are unlikely to limit the ability of Acacia species to spread in New Zealand, and could not explain their variable invasion success.

    KW - Biological invasion

    KW - Density-dependence

    KW - Establishment

    KW - Exotic

    KW - Plant-animal interactions

    KW - Weed

    U2 - 10.1016/j.ppees.2013.03.002

    DO - 10.1016/j.ppees.2013.03.002

    M3 - Article

    VL - 15

    SP - 171

    EP - 179

    JO - Perspectives in Plant Ecology, Evolution and Systematics

    JF - Perspectives in Plant Ecology, Evolution and Systematics

    SN - 1433-8319

    IS - 3

    ER -