When mutualism goes bad: density‐dependent impacts of introduced bees on plant reproduction

By M. Aizen, C. Morales, D. P. Vázquez, L. Garibaldi, A. Sáez, Lawrence D. Harder. 2014

120 citations recorded by the source corpus.

Summary Invasive, alien plants and pollinators have varying effects on their interaction partners, ranging from highly beneficial to strongly detrimental. To understand these contrasting impacts, we review the benefits and costs associated with plant–pollinator interactions and enquire as to how the presence of abundant invaders affects the benefit–cost balance. We provide a conceptual framework that predicts that mutualism shifts to antagonism when invaders increase disproportionally in abundance relative to their interaction partners. This outcome is illustrated by an empirical example of a crop in which flower damage and an associated reduction in fruit quality represent interaction costs of intense visitation by invasive bees. More generally, the extremely high density of invasive flower visitors, such as Apis mellifera and Bombus terrestris, might have population- and community-level consequences by hampering reproduction of native plants while promoting reproduction of alien plants. Furthermore, modification of the structure of pollination networks resulting from intense visitation of native plants by superabundant alien flower visitors in highly invaded communities could predict accentuated interaction costs for many native plants. Owing to their high density and the exclusion of native pollinators, invasive bees, originally introduced for honey production and crop pollination, may negatively impact both the native biota and agriculture.

Subfields: Ecology, Evolution, Behavior and Systematics, Insect Science, Plant Science

View Paper: https://www.semanticscholar.org/paper/64f36befc1c83d93169132137fd5ca12856b5a33

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In Ecology, Evolution, Behavior and Systematics

In Insect Science

In Plant Science

Citations in the corpus

Trait matching of flower visitors and crops predicts fruit set better than trait diversity (2015, background): “Reasons for this may be related to nectar robbery and flower damage (Morris, V azquez & Chacoff 2010; Aizen et al. 2014), which are more likely by larger insects possessing stronger mandibles.”
Massively Introduced Managed Species and Their Consequences for Plant–Pollinator Interactions (2017, background): “B. terrestris can also alter the reproductive success and production of some MFC (Rubus idaeus) by damaging flowers and stigmas through overvisitation (see also Aizen et al., 2014).”
Non-bee insects are important contributors to global crop pollination (2015, unknown): “, if pollinator visits are at saturating levels and result in flower damage or the transfer of poor quality/incompatible pollen (62, 63)].”
Impacts of honeybee density on crop yield: A meta‐analysis (2019, background): “Such changes in species composition could increase interaction costs and reduce plant reproductive success and crop productivity (quantity and/or quality) (Aizen et al., 2014; Hargreaves, Harder, & Johnson, 2009, 2010; Morris et al., 2010).”