Pollinator-mediated impacts of alien invasive plants on the pollination of native plants: the role of spatial scale and distinct behaviour among pollinator guilds

Alien invasive plant species can affect pollination, reproductive success and population dynamics of co-flowering native species via shared pollinators. Consequences may range from reproductive competition to facilitation, but the ecological drivers determining the type and magnitude of such indirec...

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Bibliographic Details
Published in:Biological invasions 2016-07, Vol.18 (7), p.1801-1812
Main Authors: Albrecht, Matthias, Margarita R. Ramis, Anna Traveset
Format: Article
Language:English
Subjects:
Apis mellifera
Biomedical and Life Sciences
Bombus
Developmental Biology
Diplotaxis
Diplotaxis erucoides
ecological invasion
Ecology
Flowers & plants
foraging
Foraging behavior
Freshwater & Marine Ecology
honey bees
Indigenous plants
Indigenous species
Invasive plants
invasive species
landscapes
Life Sciences
Nonnative species
Original Paper
Oxalis
Oxalis pes-caprae
Plant reproduction
Plant Sciences
Plant species
Pollen
Pollination
Pollinators
population dynamics
Reproduction
reproductive success
seed set
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Summary:Alien invasive plant species can affect pollination, reproductive success and population dynamics of co-flowering native species via shared pollinators. Consequences may range from reproductive competition to facilitation, but the ecological drivers determining the type and magnitude of such indirect interactions remain poorly understood. Here, we examine the role of the spatial scale of invader presence and spatially contingent behavioural responses of different pollinator groups as potential key drivers, using the invasive Oxalis pes-caprae and the self-incompatible native annual Diplotaxis erucoides as a model system. Three treatments were assigned to native focal plants: (1) invader present at the landscape scale (hectares) but experimentally removed at the floral neighbourhood scale (pa); (2) invader present at both scales (pp); (3) invader absent at both scales (aa). Interestingly, we found pronounced spatially contingent differences in the responses of pollinators: honeybees and bumblebees were strongly attracted into invaded sites at the landscape scale, translating into native plant visitation facilitation through honeybees, while bumblebees almost exclusively visited Oxalis. Non-corbiculate wild bees, in contrast, showed less pronounced responses in foraging behavior, primarily at the floral neighborhood scale. Average heterospecific (Oxalis) pollen deposition onto stigmas of Diplotaxis was low (
ISSN:1387-3547
1573-1464
DOI:10.1007/s10530-016-1121-6