The presence of a showy invasive plant disrupts pollinator service and reproductive output in native alpine species only at high densities

Muñoz, Alejandro Anaya; Cavieres, Lohengrin A.

doi:10.1111/j.1365-2745.2008.01361.x

Cited by 161 publications

(156 citation statements)

References 47 publications

(74 reference statements)

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“…nutrients, water, light or space) resource competition. The influence of density-dependent effects on the impacts of invasive plants on the structure of the plantpollination network deserves further exploration (Muñ oz & Cavieres 2008). …”

Section: Discussionmentioning

confidence: 99%

Invasive plant integration into native plant–pollinator networks across Europe

et al. 2009

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The structure of plant -pollinator networks has been claimed to be resilient to changes in species composition due to the weak degree of dependence among mutualistic partners. However, detailed empirical investigations of the consequences of introducing an alien plant species into mutualistic networks are lacking. We present the first cross-European analysis by using a standardized protocol to assess the degree to which a particular alien plant species (i.e. Carpobrotus affine acinaciformis, Impatiens glandulifera, Opuntia stricta, Rhododendron ponticum and Solanum elaeagnifolium) becomes integrated into existing native plant-pollinator networks, and how this translates to changes in network structure.Alien species were visited by almost half of the pollinator species present, accounting on average for 42 per cent of the visits and 24 per cent of the network interactions. Furthermore, in general, pollinators depended upon alien plants more than on native plants. However, despite the fact that invaded communities received more visits than uninvaded communities, the dominant role of alien species over natives did not translate into overall changes in network connectance, plant linkage level and nestedness. Our results imply that although supergeneralist alien plants can play a central role in the networks, the structure of the networks appears to be very permeable and robust to the introduction of invasive alien species into the network.

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Section: Discussionmentioning

confidence: 99%

Invasive plant integration into native plant–pollinator networks across Europe

et al. 2009

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“…data), on the other hand, found no impact of varying I. glandulifera density on visitation, pollen deposition or seed set in S. palustris in a heavily invaded site in Ireland. Indeed, spatio-temporal variation in findings may well be due to not only plant (alien and native) but also pollinator density (Muñoz and Cavieres, 2008), which has not been fully addressed in field studies so far.…”

Section: Indirect Impacts Via Effects On Plant Communitiesmentioning

confidence: 99%

Ecological impacts of invasive alien species on bees

2009

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-We review direct and indirect impacts of invasive alien species (focussing on plants and insects) on native bees worldwide. Although there is a rapidly growing body of research into the effects of invasive alien plants on native plant pollination via disruption of native mutualisms, there has been little research on the impacts of invasive alien plants directly on bees. Such impacts are likely to vary according to the taxon of plant, the functional specificity of the native bees, and ecosystem context. Conversely, there have been more attempts to document impacts of invasive alien social bees on native bees. Most of these studies only indirectly evaluate competition for resources, have focused on a few native species and findings are sometimes contradictory. However, some studies showed strong negative impacts, suggesting that effects might be species-specific. Additionally, pathogen spillover and reproductive disruption due to interspecific mating has been demonstrated among some closely related taxa. Where we lack unequivocal evidence for impacts however, this should not be interpreted as lack of effect. We recommend that future studies are robustly designed and consider impacts on genetic, species (particularly solitary bees) and ecosystem biodiversity.Apis mellifera / Bombus / non-native species / pollinator / plant invasion

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“…Insect pollination of native plant species can be impacted by co-flowering invasive species, with dynamics ranging from competitive to null to facilitative, depending on context (Bjerknes et al 2007;Muñoz and Cavieres 2008;Sargent and Ackerly 2008). Some invasive plants successfully compete with native species for pollinator services through more attractive floral rewards or simply due to greater floral display (Morales and Traveset 2009).…”

Section: Introductionmentioning

confidence: 99%