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Insights from measuring pollen deposition : quantifying the pre-eminence of bees as flower visitors and effective pollinators

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Wilmer_2017_Insights_from_Arthropod_Plant_Interact_CC.pdf (574.6Kb)
Date
06/2017
Author
Willmer, Patricia Gillian
Cunnold, Helen Elizabeth
Ballantyne, Gavin Andrew
Keywords
Pollination
Pollen deposition
Bees
Flower visit duration
Visit timing
Heterospecific pollen
GE Environmental Sciences
QH301 Biology
NDAS
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Abstract
Using our accumulated datasets from Kenyan savanna, Mediterranean garigue, UK gardens and heathland, involving 76 plants from 30 families, we present detailed data to quantify the superiority of bees as pollinators of most flowering plants when compared with other flower visitors. Bees provided the majority of visits to study species at all sites, and 33 of the 76 plants received more than 90% of their visits from bees. Furthermore, pollen deposition onto stigmas from single-visit events (SVD, a measure of pollination effectiveness) was significantly higher for bees than non-bees at all the four sites where a major proportion of the flora was sampled. Solitary bees, and also bumblebees in temperate habitats, were the best potential pollinators for most plants in this respect, and significantly out-performed honeybees. Only a few plants were well served by bombyliid flies, and fewer again by larger hoverflies, butterflies, or solitary wasps. Bees also achieved better matches of their visit timing to peak pollen availability (measured indirectly as peak SVD), and made much shorter visits to flowers than did non-bees, permitting a substantially greater visit frequency. Additionally, they deposited significantly lower levels of potentially deleterious heterospecific pollen on stigmas in heathland and Mediterranean garigue, though not in the UK garden with densely clustered high-diversity flowering, or in the Kenyan savanna site with particularly dispersed flowering patches and some specialist non-bee flowers. Our data provide a novel and quantified characterisation of the specific advantages of bees as flower visitors, and underline the need to conserve diverse bee communities.
Citation
Willmer , P G , Cunnold , H E & Ballantyne , G A 2017 , ' Insights from measuring pollen deposition : quantifying the pre-eminence of bees as flower visitors and effective pollinators ' , Arthropod-Plant Interactions , vol. 11 , no. 3 , pp. 411-425 . https://doi.org/10.1007/s11829-017-9528-2
Publication
Arthropod-Plant Interactions
Status
Peer reviewed
DOI
https://doi.org/10.1007/s11829-017-9528-2
ISSN
1872-8855
Type
Journal article
Rights
© The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Description
This research was funded by the Natural Environmental Research Council (grant no. NE/K004522/1), and by a St Andrews University Research studentship (HC).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10755

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