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Dominance and identity of the dominant bee drive bee diversity on flowers

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Abstract

Communities are characterized by the dominance of a few species, which are crucial for shaping communities. Bees compete for scarce resources, and offer an ideal system to study the effect of dominance on the diversity of bees. The effect of bee dominance is studied predominantly for the western honeybee, which often is illustrated negative in introduced sites. Solitary bees, stingless bees, native honeybees and bumblebees can also be dominant on flowers. We test the hypothesis that dominance, regardless of the identity of the species, negatively influence diversity of bees on flowers. We analyzed 95,160 visits of 58 species of bees on 59,211 flowers of 12 plant species for five years. Before the analyses, the visitors were grouped into honeybees, solitary bees, and stingless bees. Proportion of the total abundance accounted by the most abundant species was considered as the measure of dominance. Dominance was negatively associated with richness and visitation rate of bees, but identity of bee taxonomic group predicted the magnitude of the effects. Richness decreased with the dominance of honeybees and solitary bees, but not with the stingless bees. Visits of honeybees decreased when solitary bees dominated the visits. Visits of solitary bees decreased when honeybees or stingless bees dominated the flowers. We have shown that native bees of different taxonomic groups can exert a similar negative effect on bee diversity in flowers as invasive and managed species do. Honeybees and stingless bees, though native to some parts, deteriorate bee diversity if unnecessarily augmented to ecosystems for beekeeping.

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Acknowledgements

The field work of this project was supported by a research grant (7170/AS) to PAS by the Science Engineering Research Board, New Delhi. SV thanks Kerala State Council for Science and Technology for a Ph.D. fellowship. We also thank the two anonymous referees for their constructive criticism in the original version of the manuscript.

Funding

The research was funded by the Science Engineering Research Board, New Delhi.

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Contributions

RTP, MK and AG: assisted in field observations. JT: identified the bees. PAS: did analysis. SV and PAS: designed the study, collected data, and wrote the manuscript.

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Correspondence to Palatty Allesh Sinu.

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The authors declare no competing interests.

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Communicated by Jens Dauber.

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Varma, S., Rajesh, T.P., Manoj, K. et al. Dominance and identity of the dominant bee drive bee diversity on flowers. Biodivers Conserv 33, 333–346 (2024). https://doi.org/10.1007/s10531-023-02751-3

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  • DOI: https://doi.org/10.1007/s10531-023-02751-3

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