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Pollination Efficiency of Bumblebee Queens and Workers in the Alpine Shrub Rhododendron aureum

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Title: Pollination Efficiency of Bumblebee Queens and Workers in the Alpine Shrub Rhododendron aureum
Authors: Kudo, Gaku Browse this author →KAKEN DB
Hirao, Akira S. Browse this author
Kawai, Yuka Browse this author
Keywords: alpine plants
flowering phenology
geitonogamous pollination
pollen limitation
mating system
Issue Date: Jan-2011
Publisher: University of Chicago Press
Journal Title: International Journal of Plant Sciences
Volume: 172
Issue: 1
Start Page: 70
End Page: 77
Publisher DOI: 10.1086/657282
Abstract: Rhododendron aureum is a weakly self-compatible alpine shrub pollinated by bumblebees. Flower visitation frequency and foraging behavior differed between queen bumblebees and workers. Queens exhibited less frequent flower visits, longer flight distances between inflorescences, and a smaller number of sequential inflorescence visits within patches than did worker bees. Flowering in early-snowmelt populations occurred in June, when only overwintered queens were available, while flowering in late-snowmelt populations occurred from late July to August, when frequent visits by workers were common. The fruit to flower ratio per inflorescence was lower in early-snowmelt populations due to quantitative pollen limitation, while the seed to ovule ratio per fruit was lower in late-snowmelt populations. This is because geitonogamous pollination by workers was common later in the season, which resulted in a high abortion rate of self-pollinated seeds, that is, qualitative pollen limitation. Thus, pollination efficiency, or the type of pollen limitation, shifts during the flowering season, reflecting the seasonal life cycle of bumblebees in the ecosystem. Many of the self-fertilized seeds aborted due to high inbreeding depression, and the outcrossing rate was ∼80% regardless of season.
Rights: Distributed under licence by JSTOR.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 岳

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