Density-Dependent Pollinator Visitation and Self-Incompatibility in Upper Great Lakes Populations of Trillium grandiflorum

Steven, Janet C.; Rooney, Thomas P.; Boyle, Owen D.; Waller, Donald M.

doi:10.2307/3557522

Cited by 48 publications

(41 citation statements)

References 38 publications

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“…The relationship between pollen limitation and densities were highly variable. In some studies, the denser population was less pollen limited (-), whereas in others, the denser population was more pollen limited (+) or equally pollen limited (0) to the less dense population (Broyles et al 1997;Irwin 2000Irwin , 2001Sage et al 2001;Steven et al 2003). At my study populations, T. grandiflorum was found to be completely selfincompatible (Knight 2003b).…”

Section: Study Systemmentioning

confidence: 73%

“…Some observational studies have found positive correlations between floral density and pollinator visits, pollen loads, fruit set and seed set (e.g., Feinsinger et al 1986;Klinkhamer and de Jong 1990;House 1993;Steven et al 2003). Such correlations suggest that decreased reproductive success at low floral density results from reduced pollination.…”

Section: Introductionmentioning

confidence: 92%

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Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

2003

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Decreases in floral density can disrupt mutualistic interactions between plants and their pollinators, and decrease reproductive success. I addressed the relationship between floral density and plant reproductive success using two experimental approaches: a pollen supplementation experiment in 12 populations of Trillium grandiflorum that naturally varied in floral density, and a transplant experiment in which floral density was manipulated in plots at four experimental sites. In the pollen supplementation experiments, the degree of pollen limitation, in terms of fruit set and seed set, decreased with floral density. Further, in the experimental sites, plant reproductive success increased asymptotically with floral density. These results demonstrate the value of simultaneously conducting experiments in both experimental sites and natural populations to understand how population density influences plant reproductive success. Factors that reduce the density of this perennial herb, such as habitat fragmentation and herbivory by white-tailed deer ( Odocoileus virginianus), should be expected to limit its reproduction.

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Section: Study Systemmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 92%

Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

2003

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“…The fact that we obtained only a slightly lower Fs value in cherry in the much denser population suggests that the pollen kinship within mother tree progeny is because of insect pollinators visiting adjacent flowers on the same tree rather than due to lack of pollen donor availability. At higher floral densities the rate of insect visitation to individual flowers has been shown to be reduced as flowers compete for insect pollinator service (Steven et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Contemporary pollen flow, characterization of the maternal ecological neighbourhood and mating patterns in wild cherry (Prunus avium L.)

et al. 2009

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Conversion of lowland woodland to agricultural land and resulting fragmentation in Britain has been ongoing since Neolithic times. To counteract this decline, plantations of native species, often based on non-British planting stock, have been established. This may ultimately be detrimental to the integrity of the native gene pool. We explore the genetic and ecological factors influencing the success of components of the local pollen pool, including the effect of a nonnative planting on an ancient woodland population of wild cherry. Wild cherry exhibits gametophytic self-incompatibility (GSI) and vegetative reproduction, both of which may be determinants of paternal success. The majority (61%) of the successful pollen originated from within the study site with a maximum pollen transfer distance of 694 m. There was a distinct departure from random mating, with over half the successful pollen originating from trees which occur within 100 m of the mother tree. Self-incompatibility, clonality, tree size and proximity to the mother tree were all found to influence paternal success. Kinship of pollen gametes within a maternal progeny was highest when a mother tree was surrounded by a large number of ramets of a single, compatible clone consisting of large, adult trees. Although the contribution from the non-native plantation is currently low, it is likely that this will increasingly contribute to the progeny of the adjacent ancient population as it matures. The results clearly show that in self-incompatible species, such as P. avium, close neighbours may be pollinated by very different components of the local pollen pool.

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“…This suggests that under conditions of floral overabundance the population of pollinators is insufficient to serve so big an orchid population. In such a situation, plants probably compete for pollinators, as stated by Steven et al [47]. Goulson [48] gave an interesting explanation of lower visitation rate in larger patches.…”

Section: Discussionmentioning

confidence: 86%

Pollinator limitation affects low reproductive success in populations of nectarless orchid in the Biebrza National Park

et al. 2017

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The deficiency of pollinators is indicated as the main factor limiting fruit set in orchids. Nectariferous species are more successful in setting fruits than nectarless species. In the present study, we tested whether pollinator limitation lowers reproductive success in populations of Cypripedium calceolus on environmental islands in the Biebrza National Park, NE Poland. Moreover, we analyzed how population size and structure affect pollination success. Our observations and results of experiments document the low level of fruiting in populations of nectarless C. calceolus (9.2% on average) and strong pollen limitation. Generally, we noted a positive relationship between pollination success and all parameters of population size (measured by both occupied area and number of clumps or shoots) and parameters measuring floral display (number of flowers in population, number of flowers in clumps, spatial structure of flowering shoots). We suggest that information about factors influencing the reproductive success of this endangered species may be useful for planning appropriate conservation actions.

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Density-Dependent Pollinator Visitation and Self-Incompatibility in Upper Great Lakes Populations of Trillium grandiflorum

Cited by 48 publications

References 38 publications

Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

Floral density, pollen limitation, and reproductive success in Trillium grandiflorum

Contemporary pollen flow, characterization of the maternal ecological neighbourhood and mating patterns in wild cherry (Prunus avium L.)

Pollinator limitation affects low reproductive success in populations of nectarless orchid in the Biebrza National Park

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