Differences in pollination syndromes and the frequency of autonomous delayed selfing between co-flowering Hibiscus aponeurus (Sprague and Hutch) and H. flavifolius (Ulbr) from Kenya

Guajardo, Juan Carlos Ruiz, Schnabel, Andrew, McCallum, Britnie, Arnaiz, Adriana Otero, Baldock, Katherine and Stone, Graham N. (2018) Differences in pollination syndromes and the frequency of autonomous delayed selfing between co-flowering Hibiscus aponeurus (Sprague and Hutch) and H. flavifolius (Ulbr) from Kenya. Journal of Pollination Ecology, 22 (3). pp. 21-34. ISSN 1920-7603

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Official URL: https://doi.org/10.26786/1920-7603(2018)three

Abstract

Delayed autonomous selfing offers a mechanism for seed production when pollination levels are low or unpredictable. At Mpala Research Centre (MRC) in Kenya, we examined the relationships between floral attraction, insect visitation, and delayed autonomous selfing through backwards stylar curvature in the co-flowering Hibiscus aponeurus and H. flavifolius. Despite producing similar pollen and nectar rewards, visitation rates and the composition of floral visitor guilds varied significantly between these species. Across four years of observations, floral visitation in H. flavifolius was dominated by bees, and in H. aponeurus by a mixture of bees, butterflies and beetles. Visitation rates to H. flavifolius flowers (range 0.17 - 2.1 visits flr-1hr-1) were two times greater than to H. aponeurus flowers (range 0 - 2.7 visits flr-1hr-1), which resulted in significantly higher pollen deposition and removal rates in H. flavifolius than in H. aponeurus. Field crosses demonstrated little pollen limitation in either species. In open-pollinated flowers, H. aponeurus displayed significantly greater stylar curvature and apparent self-pollination than did H. flavifolius. Floral attributes in H. aponeurus, such as a smaller corolla size and a downwards orientation of the stylar column, also suggest that delayed selfing is a more important mechanism of reproductive assurance in this species than in H. flavifolius. Determining whether these differences in insect visitation and stylar curvature are characteristic for these species or are unique to MRC will require comparison with populations located in other parts of the ranges, genetic tests of selfing rates, and chemical analyses of nectar, pollen, and floral volatiles.

Item Type: Article
Uncontrolled Keywords: Delayed autonomous selfing, Hibiscus, pollination, stylar curvature, Mpala Research Centre
Subjects: C100 Biology
C200 Botany
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Elena Carlaw
Date Deposited: 09 Dec 2019 14:12
Last Modified: 09 Dec 2019 14:15
URI: http://nrl.northumbria.ac.uk/id/eprint/41697

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