Do pollinators influence the assembly of flower colours within plant communities?

Jager, Marinus L. de; Dreyer, L.L.; Ellis, Allan G.

doi:10.1007/s00442-010-1879-7

Cited by 72 publications

(100 citation statements)

References 46 publications

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“…In community‐wide studies, reproductive character displacement by means of divergent floral reflectance has been relatively little studied (but see McEwen & Vamosi ; de Jager et al . ; Eaton et al . ; Muchhala et al .…”

Section: Introductionmentioning

confidence: 99%

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Competition for pollinators and intra‐communal spectral dissimilarity of flowers

et al. 2015

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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.

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Section: Introductionmentioning

confidence: 99%

“…to increase dissimilar spectral properties) between simultaneously flowering plant species (Levin ; Dyer & Chittka ; McEwen & Vamosi ; de Jager et al . ; Muchhala et al . ).…”

Section: Introductionmentioning

confidence: 99%

Competition for pollinators and intra‐communal spectral dissimilarity of flowers

et al. 2015

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“…Oxalis disticha differs from O. dines in several reproductive characters, such as corolla colour (yellow petal claw/yellow petal lamina in O. disticha versus yellow claw/white lamina in O. dines) and size (corolla size consistently smaller in O. dines), among other characters (summarised in Ornduff 1973). Like many species of the genus (de Jager et al 2010), both species exhibit general insect pollination syndromes and are visited by honeybees (Apidae).…”

Section: Introductionmentioning

confidence: 99%

Chloroplast phylogeography of threatened aquatic Oxalis (Oxalidaceae): significant inter-population structure, divergent haplotypes and conservation implications

2012

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The aquatic lineage consisting of the sister taxa Oxalis dines and O. disticha is confined to a few small vernal pools in the semi-arid Greater Cape Floristic Region of South Africa. All known populations are at risk of extinction due to anthropogenically induced disturbance. To identify priority sites for focused conservation management, the chloroplast intergenic spacer regions psbA-trnH and trnS-trnG were used to determine population structure and genetic diversity in this lineage across its distribution range. Population viability was assessed using flower morph ratios as surrogate for sexual health. Fourteen and four haplotypes were identified from O. disticha and O. dines populations, respectively. Analyses of Molecular Variance indicated an extremely high level of interpopulation differentiation across the entire aquatic lineage as well as within O. disticha and O. dines. Fifty percent of the eighteen haplotypes were confined to single pools, and 84% of populations contained only a single haplotype, even though pool interspacing distance for O. disticha was often less than 5 km. Almost half of O. disticha haplotype diversity was restricted to very small populations. Two O. dines haplotypes were restricted to small populations, with one of these presenting a divergent haplotype sister to the remainder of the aquatic lineage. Flower morph frequency ratio analyses suggested that most populations were reproductively healthy. Low haplotypic diversity within local populations and differentiation between populations are consistent with very low seed-level gene flow and sporadic founder effects. Conservation efforts should be focussed on preserving as many pools as possible with small, genetically distinct populations representing a main concern.

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“…Although pollination of southern African Oxalis is understudied (De Jager et al 2011), most species are thought to be generalist, similar to most of the studied non-southern African taxa (Robertson 1929;Weller 1981;Bernhardt 1990;Luo et al 2006;Abid 2010;Krug et al 2012). Although global pollinators include various species of Hymenoptera, Diptera, and diurnal Lepidoptera, bees are believed to be the main pollinators of Oxalis in South Africa (De Jager et al 2011;Dreyer, Oberlander, Roets pers.…”

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confidence: 99%

“…Although global pollinators include various species of Hymenoptera, Diptera, and diurnal Lepidoptera, bees are believed to be the main pollinators of Oxalis in South Africa (De Jager et al 2011;Dreyer, Oberlander, Roets pers. observ.).…”

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confidence: 99%

An Unusual Night-Flowering <I>Oxalis</I> from South Africa (Oxalidaceae)

Dreyer¹,

Macfarlane²,

Roets³

et al. 2014

Systematic Botany

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A new Oxalis (Oxalidaceae) species from the Hantamsberg (South Africa) is described and typified as Oxalis noctiflora using morphological, palynological, and molecular characters. Superficially it closely resembles Oxalis aridicola, Oxalis callosa, Oxalis odorata, and Oxalis primuloides, and it shares a unique supra-areolate pollen type with most of these species. No single vegetative morphological character defines this species, but a unique combination of bulb and leaflet characters distinguishes it from all other known species. The flowers of Oxalis noctiflora are unique for the genus in displaying typical moth-pollination characters. The white flowers open at night, have a long, unusually narrow, corolla tube, and produce a strong sweet scent. All previously described Oxalis species have flowers that open during the day. Phylogenetic analyses based on nuclear Internal Transcribed Spacer data placed this species sister to O. aridicola within a clade of morphologically and palynologically similar taxa.

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Do pollinators influence the assembly of flower colours within plant communities?

Cited by 72 publications

References 46 publications

Competition for pollinators and intra‐communal spectral dissimilarity of flowers

Competition for pollinators and intra‐communal spectral dissimilarity of flowers

Chloroplast phylogeography of threatened aquatic Oxalis (Oxalidaceae): significant inter-population structure, divergent haplotypes and conservation implications

An Unusual Night-Flowering <I>Oxalis</I> from South Africa (Oxalidaceae)

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