Mutualisms: Key Drivers of Invasions … Key Casualties of Invasions

Traveset, Anna; Richardson, David M.

doi:10.1002/9781444329988.ch12

Cited by 26 publications

(33 citation statements)

References 135 publications

(181 reference statements)

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“…and their wasp mutualists in New Zealand (Gardner and Early ). An invasive species may act as a surrogate for an ecologically similar native partner and facilitate seed dispersal or pollination (Goulson ; Traveset and Richardson , ; Mondor and Addicott ; Aizen et al. ; Burns ).…”

Section: Discussionmentioning

confidence: 99%

Twelve years of repeated wild hog activity promotes population maintenance of an invasive clonal plant in a coastal dune ecosystem

Oldfield

Evans

2016

Ecology and Evolution

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Invasive animals can facilitate the success of invasive plant populations through disturbance. We examined the relationship between the repeated foraging disturbance of an invasive animal and the population maintenance of an invasive plant in a coastal dune ecosystem. We hypothesized that feral wild hog (Sus scrofa) populations repeatedly utilized tubers of the clonal perennial, yellow nutsedge (Cyperus esculentus) as a food source and evaluated whether hog activity promoted the long‐term maintenance of yellow nutsedge populations on St. Catherine's Island, Georgia, United States. Using generalized linear mixed models, we tested the effect of wild hog disturbance on permanent sites for yellow nutsedge culm density, tuber density, and percent cover of native plant species over a 12‐year period. We found that disturbance plots had a higher number of culms and tubers and a lower percentage of native live plant cover than undisturbed control plots. Wild hogs redisturbed the disturbed plots approximately every 5 years. Our research provides demographic evidence that repeated foraging disturbances by an invasive animal promote the long‐term population maintenance of an invasive clonal plant. Opportunistic facultative interactions such as we demonstrate in this study are likely to become more commonplace as greater numbers of introduced species are integrated into ecological communities around the world.

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Section: Discussionmentioning

confidence: 99%

Twelve years of repeated wild hog activity promotes population maintenance of an invasive clonal plant in a coastal dune ecosystem

Oldfield

Evans

2016

Ecology and Evolution

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“…Disruptions caused by alien invasions that affect pollination and reproductive success of native plant species have been increasingly documented (Traveset & Richardson 2011). In the presence of more attractive alien plant species (e.g., with higher nectar rewards), natives can receive fewer pollinator visits and/or a reduction in the quality of visits as a result of changes in pollinator abundance or behavior (Lopezaraiza-Mikel et al 2007, Gibson et al 2013, LeVan et al 2014).…”

Section: Pollination Disruptionsmentioning

confidence: 98%

“…Many introduced vertebrates have had detrimental effects on native floras and faunas, more notably on islands. The negative impact of, for example, introduced goats, cats, rats, opossums, and parrots on plant fitness and dispersal can be multifaceted, including the direct consumption of native plants and/or, more indirectly, the reduction of populations of legitimate seed dispersers (Traveset & Richardson 2011). Different novel mutualistic relationships with alien species compensate at least partly for the extinctions of native mutualists (Cheke & Hume 2008, Kawakami et al 2009, perhaps because species abundances rather than traitmatching constraints ultimately determine the interaction patterns between birds and plants, as suggested by García et al (2014).…”

Section: Seed Dispersal Disruptionsmentioning

confidence: 99%

Mutualistic Interactions and Biological Invasions

Traveset

Richardson

2014

Annu. Rev. Ecol. Evol. Syst.

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366

345

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Mutualisms structure ecosystems and mediate their functioning. They also enhance invasions of many alien species. Invasions disrupt native mutualisms, often leading to population declines, reduced biodiversity, and altered ecosystem functioning. Focusing on three main types of mutualisms (pollination, seed dispersal, and plant-microbial symbioses) and drawing on examples from different ecosystems and from species-and community-level studies, we review the key mechanisms whereby such positive interactions mediate invasions and are in turn influenced by invasions. High interaction generalization is "the norm" in most systems, allowing alien species to infiltrate recipient communities. We identify traits that influence invasiveness (e.g., selfing capacity in plants, animal behavioral traits) or invasibility (e.g., partner choice in mycorrhizas/rhizobia) through mutualistic interactions. Mutualistic disruptions due to invasions are pervasive, and subsequent cascading effects are also widespread. Ecological networks provide a useful framework for predicting tipping points for community collapse in response to invasions and other synergistic drivers of global change. 89

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“…Though research on this subject has increased over the last decade (Traveset and Richardson, 2011), most work has focused on alien shrubs or herbaceous species (e.g. Impatiens, Lonicera, Lythrum, Solidago), whereas some of the most problematic invasive species in many parts of the world are trees (e.g.…”

Section: Introductionmentioning

confidence: 99%

Decreased insect visitation to a native species caused by an invasive tree in the Cape Floristic Region

Gibson

Pauw

Richardson

2013

Biological Conservation

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a b s t r a c tFlowering invasive plants can potentially reduce pollination rates in co-flowering native plant species by attracting shared flower visitors. We investigate the effect of a prolifically flowering invasive species, Acacia saligna (Fabaceae), on native insect-flower interactions in surrounding communities. We surveyed flower visitation to A. saligna and selected native species at invaded and uninvaded areas and assessed the extent of flower visitor overlap of A. saligna and native species across four sites in South Africa's Cape Floristic Region. Median visitation rates of bees and all insects were significantly lower to one native species (Roepera fulva) in both field seasons at the same site when A. saligna was present. This native species also had the highest flower visitor overlap with A. saligna which was driven primarily by the native honeybee, Apis mellifera subsp. capensis. Observational data showed that A. saligna inflorescences were visited most frequently by minute beetles and the native honeybee. Our findings indicate that native honeybees are important visitors to A. saligna, and that at least one native plant species experiences reduced flower visitation due to competition with A. saligna for honeybee visits. Flowering A. saligna could have widereaching effects on native plants by competing for visits from a super generalist flower visitor -the native honeybee -which may jeopardize the reproductive success of natives whose flowering time overlaps with that of A. saligna. Our study further highlights the importance of understanding the effect of a flowering invasive species on native species and the potentially important mutualism between A. saligna and honeybees.

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Mutualisms: Key Drivers of Invasions … Key Casualties of Invasions

Cited by 26 publications

References 135 publications

Twelve years of repeated wild hog activity promotes population maintenance of an invasive clonal plant in a coastal dune ecosystem

Twelve years of repeated wild hog activity promotes population maintenance of an invasive clonal plant in a coastal dune ecosystem

Mutualistic Interactions and Biological Invasions

Decreased insect visitation to a native species caused by an invasive tree in the Cape Floristic Region

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