The role of pollinators in floral diversification in a clade of generalist flowers

Gómez, José M.; Perfectti, Francisco; Lorite, Juan

doi:10.1111/evo.12632

Cited by 66 publications

(54 citation statements)

References 105 publications

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“…Nonetheless, our study appears to be the first to examine this relationship on a macroevolutionary scale, treating both pollination system and floral shape as quantitative traits (see Gomez et al. () for a discrete example).…”

Section: Discussionmentioning

confidence: 99%

Convergent evolution of floral shape tied to pollinator shifts in Iochrominae (Solanaceae)*

Smith

Kriebel

2018

Evolution

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Flower form is one of many floral features thought to be shaped by pollinator-mediated selection. Although the drivers of variation in flower shape have often been examined in microevolutionary studies, relatively few have tested the relationship between shape evolution and shifts in pollination system across clades. In the present study, we use morphometric approaches to quantify shape variation across the Andean clade Iochrominae and estimate the relationship between changes in shape and shifts in pollination system using phylogenetic comparative methods. We infer multiple shifts from an ancestral state of narrow, tubular flowers toward open, bowl-shaped, or campanulate flowers as well as one reversal to the tubular form. These transitions in flower shape are significantly correlated with changes in pollination system. Specifically, tubular forms tend to be hummingbird-pollinated and the open forms tend to be insect-pollinated, a pattern consistent with experimental work as well as classical floral syndromes. Nonetheless, our study provides one of the few empirical demonstrations of the relationship between flower shape and pollination system at a macroevolutionary scale.

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Section: Discussionmentioning

confidence: 99%

Convergent evolution of floral shape tied to pollinator shifts in Iochrominae (Solanaceae)*

Smith

Kriebel

2018

Evolution

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“…Even the corolla shape of highly generalist species has been shown to adapt to particular guilds of pollinators (Gómez and Perfectti ; Gómez et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, we test if increased generalization in pollination strategies is associated with relaxed selection constraints, or greater diversification (disparity), for corolla shape in species of the subtribe Gesneriinae of the Gesneriaceae family in the Caribbean islands. The recent development of powerful phylogenetic comparative methods allows the estimation of historic selective constraints on large groups of species (e.g., Hansen and Martins 1996;Beaulieu et al 2012;Butler and King 2004) and thus testing specific hypotheses regarding the role of pollinators on floral trait evolution (Smith et al 2008;Gómez et al 2015;Lagomarsino et al 2017). Unlike many investigations performed at the population level, such approaches aim at characterizing constraints on morphological variation over macroevolutionary scales and, as such, should be informative to understand the forces that have been determinant in modeling the morphology of large groups of species.…”

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confidence: 99%

Greater pollination generalization is not associated with reduced constraints on corolla shape in Antillean plants

et al. 2018

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Flowers show important structural variation as reproductive organs but the evolutionary forces underlying this diversity are still poorly understood. In animal-pollinated species, flower shape is strongly fashioned by selection imposed by pollinators, which is expected to vary according to guilds of effective pollinators. Using the Antillean subtribe Gesneriinae (Gesneriaceae), we tested the hypothesis that pollination specialists pollinated by one functional type of pollinator have maintained more similar corolla shapes through time due to more constant and stronger selection constraints compared to species with more generalist pollination strategies. Using geometric morphometrics and evolutionary models, we showed that the corolla of hummingbird specialists, bat specialists, and species with a mixed-pollination strategy (pollinated by hummingbirds and bats; thus a more generalist strategy) have distinct shapes and that these shapes have evolved under evolutionary constraints. However, we did not find support for greater disparity in corolla shape of more generalist species. This could be because the corolla shape of more generalist species in subtribe Gesneriinae, which has evolved multiple times, is finely adapted to be effectively pollinated by both bats and hummingbirds. These results suggest that ecological generalization is not necessarily associated with relaxed selection constraints.

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“…; Gómez et al. ; Meloro et al. ); but, to our knowledge, it has been never used before to analyze multivariate semiquantitative data of flower scents.…”

Section: Introductionmentioning

confidence: 99%

Comparative analyses of flower scent inSileneaereveal a contrasting phylogenetic signal between night and day emissions

Prieto‐Benítez

Millanes

Dötterl

et al. 2016

Ecology and Evolution

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Flower scents are complex blends of volatile compounds often shaped by selection pressures exerted by mutualistic and antagonistic interaction partners, but also by phylogenetic constraints. So far, little is known about the relative effect of selection and phylogenetic signal on scent patterns, and no study to date analyzed the phylogenetic signal in multivariate semiquantitative scent patterns. We analyzed the phylogenetic signal in qualitative and semi-quantitative patterns of flower scents in 47 Sileneae (Caryophyllaceae) species using phylogenetic principal component analysis (pPCA) and several indices of univariate and multivariate phylogenetic signal. As previous results showed that Sileneae species are visited by diurnal and nocturnal pollinators and flower scents also vary along the day, we compared the phylogenetic signal between night and day. Multivariate pPCA analyses identified compounds that correlate with the phylogeny at both night and day; however, multivariate Bloomberg 0 s K detected phylogenetic signal in the dataset of night scents, but not of day scents. In multivariate qualitative datasets, phylogenetic signal was neither found for day nor for night scents. In univariate analyses, phylogenetic signal was detected for some compounds both for day and night scents. Overall, we found that the phylogenetic signal is stronger in night compared to day scents, which might be owed to the different guilds of pollinators at day and night. At day, the phylogenetic resemblance of Sileneae scents might be masked by or disappear due to divergent selective pressures exerted by a diverse guild of pollinators on the different species. In contrast, we hypothesize that the nocturnal moth pollinators exert similar selective pressures; thus, the phylogenetic similarity of scent profiles might be conserved. Future studies of scent phylogenetic signal must consider not only the usage of qualitative measures but also semiquantitative analyses.

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The role of pollinators in floral diversification in a clade of generalist flowers

Cited by 66 publications

References 105 publications

Convergent evolution of floral shape tied to pollinator shifts in Iochrominae (Solanaceae)*

Convergent evolution of floral shape tied to pollinator shifts in Iochrominae (Solanaceae)*

Greater pollination generalization is not associated with reduced constraints on corolla shape in Antillean plants

Comparative analyses of flower scent inSileneaereveal a contrasting phylogenetic signal between night and day emissions

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