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Pollinator niche partitioning and asymmetric facilitation contribute to the maintenance of diversity

View ORCID ProfileNa Wei, View ORCID ProfileRainee L. Kaczorowski, View ORCID ProfileGerardo Arceo-Gómez, Elizabeth M. O’Neill, Rebecca A. Hayes, View ORCID ProfileTia-Lynn Ashman
doi: https://doi.org/10.1101/2020.03.02.974022
Na Wei
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
2The Holden Arboretum, Kirtland, OH, USA.
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  • For correspondence: nwei@holdenfg.org tia1@pitt.edu
Rainee L. Kaczorowski
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
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Gerardo Arceo-Gómez
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
3Department of Biological Sciences, East Tennessee State University, Johnson City, TN, USA.
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Elizabeth M. O’Neill
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
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Rebecca A. Hayes
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
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Tia-Lynn Ashman
1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.
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  • For correspondence: nwei@holdenfg.org tia1@pitt.edu
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Abstract:

Mechanisms that favor rare species are key to the maintenance of diversity. One of the most critical tasks for biodiversity conservation is understanding how plant–pollinator mutualisms contribute to the persistence of rare species, yet this remains poorly understood. Using a process-based model that integrates plant–pollinator and interspecific pollen transfer networks with floral functional traits, we show that niche partitioning in pollinator use and asymmetric facilitation confer fitness advantage of rare species in a biodiversity hotspot. While co-flowering species filtered pollinators via floral traits, rare species showed greater pollinator specialization leading to higher pollination-mediated male and female fitness than abundant species. When plants shared pollinator resources, asymmetric facilitation via pollen transport dynamics benefited the rare species at the cost of the abundant ones, serving as an alternative diversity-promoting mechanism. Our results emphasize the importance of community-wide plant–pollinator interactions that affect reproduction for biodiversity maintenance.

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Posted March 04, 2020.
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Pollinator niche partitioning and asymmetric facilitation contribute to the maintenance of diversity
Na Wei, Rainee L. Kaczorowski, Gerardo Arceo-Gómez, Elizabeth M. O’Neill, Rebecca A. Hayes, Tia-Lynn Ashman
bioRxiv 2020.03.02.974022; doi: https://doi.org/10.1101/2020.03.02.974022
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Pollinator niche partitioning and asymmetric facilitation contribute to the maintenance of diversity
Na Wei, Rainee L. Kaczorowski, Gerardo Arceo-Gómez, Elizabeth M. O’Neill, Rebecca A. Hayes, Tia-Lynn Ashman
bioRxiv 2020.03.02.974022; doi: https://doi.org/10.1101/2020.03.02.974022

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