Abstract
Many endangered plants are susceptible to pollination failure due to their rareness. We studied the threatened Chilean tree Legrandia concinna (Myrtaceae) with melittophilous pollen-only flowers and the pollen loads of Manuelia postica and asked: Do bees guarantee fruit set? What is the role of the endangered plant as a pollen source for M. postica? Only bees of the relictual endemic Manuelia postica and introduced Bombus terrestris and honeybees visited the flowers. Overall flower visitation was very low and so was fruit set. Exotic B. terrestris was the only effective pollinator. The small native M. postica scarcely contributed to pollination and mainly used pollen of L. concinna to rear offspring in the resource-poor Nothofagus forest: pollen of 19 flowers was sufficient to feed a single larvae. Reintroduction of trees of L. concinna as a measure of species protection would also benefit the maintenance of native populations of M. postica. We assume that the introduced bumblebees displaced native Bombus dahlbomii as pollinators of this red list tree species.
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Acknowledgements
We thank Fundação de Parques Municipais e Zoobotânica (FPMZB) and the graduate course in Ecologia, Conservação e Manejo de Vida Silestre (ECMVS) of Universidade Federal de Minas Gerais for logistic support, and two anonymous reviewers for their constructive comments that considerably improved the manuscript. The research received financial support from Gobierno Regional del Maule (FIC-R BIP N 30.387.076-0) and Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (Universal 436095/2018-1). We also thank for the research grant from CNPq (311935/2018-4) to CS.
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JOR, CS and VHM conceived the research, designed experiments and interpreted the data; JOR and RG performed the experiments; JOR and CS wrote the paper. All authors performed analyses, participated in revisions, and read and approved the final manuscript.
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Rego, J.O., Schlindwein, C., Garrido, R. et al. Low fruit set in an endangered tree: pollination by exotic bumblebees and pollen resource for relictual native bees. Arthropod-Plant Interactions 15, 491–501 (2021). https://doi.org/10.1007/s11829-021-09841-5
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DOI: https://doi.org/10.1007/s11829-021-09841-5