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Abstract:

Most non-autogamous orchids rely on either a single, or on a small number of pollinators to set fruit. The nectar-rewarding orchid Brachystele unilateralis and the nectarless and deceit-pollinated Chloraea virescens are restricted to the Southern Andes, where a single native and endemic bumblebee (Bombus dahlbomii) occured until the introduction of honeybees and highly invasive European bumblebees. Here, we describe the floral features, breeding system, pollinator activity and fruiting success of these orchid species. Both are self-compatible but pollinator-dependent, i.e., unable to set fruit and seed in the absence of pollinators. Field observations revealed that most of their current reproductive success is due to the introduced Bombus terrestris, Bombus ruderatus and Apis mellifera bees. The only native pollinator recorded was B. dahlbomii, but this bee was rarely observed due to its steady decline since the introduction of the alien Bombus species. The observed natural fruiting success per inflorescence in both studied species proved to be remarkably high by orchid standards: 83% and 66%, respectively. These results suggest that sexual reproduction in these orchids is not necessarily threatened by the decline of their native pollinator since pollination is successfully achieved by introduced bees. This provides a plausible better outlook for these and other regional, bumblebee-pollinated orchids and raises caution on eventual conservation policies involving the management of these introduced bee species. To our knowledge, this is the first report of native orchid pollinators being effectively replaced by invasive bumblebees and, furthermore, the first description of the pollination biology of a species of Brachystele. © 2014 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Invasive bees promote high reproductive success in Andean orchids
Autor:Sanguinetti, A.; Singer, R.B.
Filiación:Laboratorio de Biología del Desarrollo de las Plantas, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Instituto de Biodiversidad y Biología Experimental y Aplicada, CONICET-UBA, Argentina
Programa de Pós-graduação em Botânica, Departamento de Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Brazil
Palabras clave:Bombus; Honeybees; Invasive species; Mutualism; Orchidaceae; Patagonia
Año:2014
Volumen:175
Página de inicio:10
Página de fin:20
DOI: http://dx.doi.org/10.1016/j.biocon.2014.04.011
Título revista:Biological Conservation
Título revista abreviado:Biol. Conserv.
ISSN:00063207
CODEN:BICOB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00063207_v175_n_p10_Sanguinetti

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Citas:

---------- APA ----------
Sanguinetti, A. & Singer, R.B. (2014) . Invasive bees promote high reproductive success in Andean orchids. Biological Conservation, 175, 10-20.
http://dx.doi.org/10.1016/j.biocon.2014.04.011
---------- CHICAGO ----------
Sanguinetti, A., Singer, R.B. "Invasive bees promote high reproductive success in Andean orchids" . Biological Conservation 175 (2014) : 10-20.
http://dx.doi.org/10.1016/j.biocon.2014.04.011
---------- MLA ----------
Sanguinetti, A., Singer, R.B. "Invasive bees promote high reproductive success in Andean orchids" . Biological Conservation, vol. 175, 2014, pp. 10-20.
http://dx.doi.org/10.1016/j.biocon.2014.04.011
---------- VANCOUVER ----------
Sanguinetti, A., Singer, R.B. Invasive bees promote high reproductive success in Andean orchids. Biol. Conserv. 2014;175:10-20.
http://dx.doi.org/10.1016/j.biocon.2014.04.011