Floral Design in<i>Polemonium brandegei</i>(Polemoniaceae): Genetic and Phenotypic Variation under Hawkmoth and Hummingbird Pollination

Kulbaba, Mason W.; Worley, Anne C.

doi:10.1086/528751

Cited by 33 publications

(57 citation statements)

References 48 publications

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“…Finally, we standardized all experimental inflorescences to seven freshly opened flowers that remained open for the duration of the experiment. The range of herkogamy and corolla trait variation in our arrays was similar to variation observed in natural populations (Kulbaba and Worley ).…”

Section: Methodssupporting

confidence: 81%

SELECTION ONPOLEMONIUM BRANDEGEEI(POLEMONIACEAE) FLOWERS UNDER HUMMINGBIRD POLLINATION: IN OPPOSITION, PARALLEL, OR INDEPENDENT OF SELECTION BY HAWKMOTHS?

Kulbaba

Worley

2013

Evolution

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We then compared the patterns of selection by hummingbirds with our previous study examining selection by hawkmoths. We documented contrasting selection on sex organ positioning through female function, with hummingbirds selecting for stigmas exserted beyond the anthers and hawkmoths selecting for stigmas recessed below the anthers. Furthermore, hummingbirds selected for longer and wider corolla tubes, and hawkmoths selected for narrower corolla tubes. Therefore, contrasting selection by hawkmoths and hummingbirds may account for variation in sex organ arrangements and corolla dimensions in P. brandegeei.We documented how floral traits under selection by multiple pollinators can result in either an intermediate "compromise" between selective pressures (sex organs) or apparent specialization (corolla tube length) to one pollinator.

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Section: Methodssupporting

confidence: 81%

SELECTION ONPOLEMONIUM BRANDEGEEI(POLEMONIACEAE) FLOWERS UNDER HUMMINGBIRD POLLINATION: IN OPPOSITION, PARALLEL, OR INDEPENDENT OF SELECTION BY HAWKMOTHS?

Kulbaba

Worley

2013

Evolution

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“…), fluctuations in hawkmoth visitation may be a legitimate factor in the long‐term population dynamics of other sphingophilous taxa, as hawkmoth abundance has been shown to vary substantially in both space and time (Miller ; Campbell et al . ; Sime & Baldwin ; Kulbaba & Worley ; Artz et al . ; Miller et al .…”

Section: Discussionmentioning

confidence: 99%

Pollinator identity and spatial isolation influence multiple paternity in an annual plant

Rhodes

Fant²,

Skogen³

2017

Molecular Ecology

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The occurrence and extent of multiple paternity is an important component of variation in plant mating dynamics. However, links between pollinator activity and multiple paternity are generally lacking, especially for plant species that attract functionally diverse floral visitors. In this study, we separated the influence of two functionally distinct floral visitors (hawkmoths and solitary bees) and characterized their impacts on multiple paternity in a self-incompatible, annual forb, Oenothera harringtonii (Onagraceae). We also situated pollinator-mediated effects in a spatial context by linking variation in multiple paternity to variation in plant spatial isolation. We documented pronounced differences in the number of paternal sires as function of pollinator identity: on average, the primary pollinator (hawkmoths) facilitated mating with nearly twice as many pollen donors relative to the secondary pollinator (solitary bees). This effect was consistent for both isolated and nonisolated individuals, but spatial isolation imposed pronounced reductions on multiple paternity regardless of pollinator identity. Considering that pollinator abundance and pollen dispersal distance did not vary significantly with pollinator identity, we attribute variation in realized mating dynamics primarily to differences in pollinator morphology and behaviour as opposed to pollinator abundance or mating incompatibility arising from underlying spatial genetic structure. Our findings demonstrate that functionally distinct pollinators can have strongly divergent effects on polyandry in plants and further suggest that both pollinator identity and spatial heterogeneity have important roles in plant mating dynamics.

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“…Polemonium confertum differs from P. viscosum in its light blue campulate-funnelform corollas, and larger, less congested leaflets ( Grant 1989 ). Polemonium viscosum and P. brandegei are also distinguished by habitat ( Grant 1989 ) and pollination biology ( Galen 1996 ;Kulbaba and Worley 2008 ). Unfortunately, we had no tissue from P. confertum but P. viscosum and P. brandegei formed a monophyletic group ( Figs.…”

Section: Discussionmentioning

confidence: 97%

A Phylogeny of the Genus Polemonium Based on Amplified Fragment Length Polymorphism (AFLP) Markers

Worley¹,

Ghazvini²,

Schemske³

2009

Systematic Botany

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The genus Polemonium is composed of animal-pollinated herbs found largely in North America. Wide phenotypic variation suggests rapid evolution of floral and vegetative morphology. However, phylogenetic relationships within Polemonium have received little attention. We present a phylogeny of Polemonium based on 1676 Amplified Fragment Length Polymorphisms (AFLPs). We obtained similar topologies through minimum evolution analysis using Nei-Li genetic distances and parsimony analysis. Our analyses supported the monophyly of most species, and indicated that the single annual species, P. micranthum, is sister to all perennial species. Relationships were well resolved among species separated by genetic distances < 0.16. Three well-supported clades each included taxa from one of three species complexes: the P. caeruleum complex, the P. pulcherrimum complex, or the P. viscosum complex. Relationships within clades were generally consistent with earlier systematic work. Exceptions were the inclusion of eastern North American P. reptans within the P. caeruleum clade, inclusion of P. boreale within the P. pulcherrimum clade, and a close relationship between tetraploid P. californicum and diploid P. pulcherrimum subsp. delicatum. Our results indicate that floral traits are quite divergent among close relatives within the genus, and provide a phylogenetic framework for research on adaptation and speciation in Polemonium.

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Floral Design inPolemonium brandegei(Polemoniaceae): Genetic and Phenotypic Variation under Hawkmoth and Hummingbird Pollination

Cited by 33 publications

References 48 publications

SELECTION ONPOLEMONIUM BRANDEGEEI(POLEMONIACEAE) FLOWERS UNDER HUMMINGBIRD POLLINATION: IN OPPOSITION, PARALLEL, OR INDEPENDENT OF SELECTION BY HAWKMOTHS?

SELECTION ONPOLEMONIUM BRANDEGEEI(POLEMONIACEAE) FLOWERS UNDER HUMMINGBIRD POLLINATION: IN OPPOSITION, PARALLEL, OR INDEPENDENT OF SELECTION BY HAWKMOTHS?

Pollinator identity and spatial isolation influence multiple paternity in an annual plant

A Phylogeny of the Genus Polemonium Based on Amplified Fragment Length Polymorphism (AFLP) Markers

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