Competition for pollinators and intra-communal spectral dissimilarity of flowers - PubMed (original) (raw)
doi: 10.1111/plb.12328. Epub 2015 Apr 16.
Affiliations
- PMID: 25754608
- DOI: 10.1111/plb.12328
Competition for pollinators and intra-communal spectral dissimilarity of flowers
C J van der Kooi et al. Plant Biol (Stuttg). 2016 Jan.
Abstract
Competition for pollinators occurs when, in a community of flowering plants, several simultaneously flowering plant species depend on the same pollinator. Competition for pollinators increases interspecific pollen transfer rates, thereby reducing the number of viable offspring. In order to decrease interspecific pollen transfer, plant species can distinguish themselves from competitors by having a divergent phenotype. Floral colour is an important signalling cue to attract potential pollinators and thus a major aspect of the flower phenotype. In this study, we analysed the amount of spectral dissimilarity of flowers among pollinator-competing plants in a Dutch nature reserve. We expected pollinator-competing plants to exhibit more spectral dissimilarity than non-competing plants. Using flower visitation data of 2 years, we determined the amount of competition for pollinators by different plant species. Plant species that were visited by the same pollinator were considered specialist and competing for that pollinator, whereas plant species visited by a broad array of pollinators were considered non-competing generalists. We used principal components analysis to quantify floral reflectance, and found evidence for enhanced spectral dissimilarity among plant species within specialist pollinator guilds (i.e. groups of plant species competing for the same pollinator). This is the first study that examined intra-communal dissimilarity in floral reflectance with a focus on the pollination system.
Keywords: Biotic interactions; flower colouration; plant-pollinator signalling; principal components analysis; reproductive character displacement.
© 2015 German Botanical Society and The Royal Botanical Society of the Netherlands.
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