Abstract
Invasive social bees can alter plant-pollinator interactions with detrimental effects on both partners. However, most studies have focused on one invasive bee species, while the interactions among two or more species remain poorly understood. Also, many study sites had a history of invasive bees, being hard to find sites with historical low abundances. In Patagonia, Bombus ruderatus (F.) invasion begun in 1993 and B. terrestris (L.) in 2006. Though honey bees (Apis mellifera L.) introduction started in 1859, their density is still low in some parts. By experimentally increasing honey bee densities, we evaluated the effect of honey bees and bumblebees floral visitation on native pollinator floral visitation, pollen deposition, and reproductive success of three plant species in mixed Nothofagus antarctica forests of northern Patagonia: Oxalis valdiviensis, Mutisia spinosa and Cirsium vulgare. Our results show that exotic bees became the main floral visitors. No negative association was found between invasive bee and native pollinator visitation rates, but there was evidence of potential competition between honey bees and bumblebees. Floral neighborhood diversity played an important role in pollinator behavior. Conspecific pollen deposition was high for all species, while deposition of heterospecific pollen was very high in M. spinosa and C. vulgare. Not as expected, honey bees visitation rate had a negative effect on heterospecific pollen deposition in C. vulgare. For O. valdiviensis, exotic visitation rates increased conspecific pollen deposition, which was positively related to reproductive success. Although exotic bees became main floral visitors, their contribution to reproductive success was only clear for one species.
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Acknowledgments
We are grateful to C. Coulin and A. Antokoletz, G. J. Huerta, C.A. John and D. H. Bascur for their vital contribution to the project. We also thank G. Zarlavsky and B. G. Galati for their collaboration in pollen analysis. We are grateful to Márcia Maués, Carmen Pires and Cláudia Inês Silva for inviting us to participate in this Special Volume of Neotropical Entomology. The manuscript benefited from critical reading of two anonymous reviewers. This research was funded by Agencia Nacional de Promoción Científica y Tecnológica (PICT 2013-1079 and PICT 2016-0305). JIA, NPM, JPT and LAG are affiliated with CONICET.
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JIA and LAG contributed to the design and implementation of the research. JIA, NPM, JPT and LAG contributed to the analysis of the results and to the writing of the manuscript. LAG supervised the project since its original idea. All authors approved the final version of the manuscript.
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Agüero, J.I., Pérez-Méndez, N., Torretta, J.P. et al. Impact of Invasive Bees on Plant-Pollinator Interactions and Reproductive Success of Plant Species in Mixed Nothofagus antarctica Forests. Neotrop Entomol 49, 557–567 (2020). https://doi.org/10.1007/s13744-020-00787-6
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DOI: https://doi.org/10.1007/s13744-020-00787-6