Search Results - "KARRON, J. D"

The Influence of Mimulus ringens Floral Display Size on Pollinator Visitation Patterns by Mitchell, R. J., Karron, J. D., Holmquist, K. G., Bell, J. M.

“…1. Pollinators visiting large floral displays may probe several flowers in sequence, leading to geitonogamous (among-flower) self-pollination. To investigate…”
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influence of floral display size on selfing rates in Mimulus ringens by Karron, J.D, Mitchell, R.J, Holmquist, K.G, Bell, J.M, Funk, B

“…Pollinators often visit several flowers in sequence on plants with large floral displays. This foraging pattern is expected to influence the rate of…”
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Herkogamy and mate diversity in the wild daffodil Narcissus longispathus: beyond the selfing-outcrossing paradigm in the evolution of mixed mating by Medrano, M., Requerey, R., Karron, J. D., Herrera, C. M.

“…Spatial separation of male and female reproductive structures (herkogamy) is a widespread floral trait that has traditionally been viewed as an adaptation that…”
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The influence of population density on outcrossing rates in Mimulus ringens by KARRON, J. D, THUMSER, N. N, TUCKER, R, HESSENAUER, A. J

“…The influence of population density on pollinator movements and outcrossing rates was studied in experimental arrays of Mimulus ringens (square-stemmed…”
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Patterns of microsatellite polymorphism in the range-restricted bonobo (Pan paniscus): considerations for interspecific comparison with chimpanzees (P. troglodytes) by Reinartz, G. E., Karron, J. D., Phillips, R. B., Weber, J. L.

“…The endangered great ape, Pan paniscus (bonobo) has the smallest range of the African apes. Virtually nothing is known about the genetic diversity or genetic…”
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Interspecific competition for pollination lowers seed production and outcrossing in Mimulus ringens by Bell, John M., Karron, Jeffrey D., Mitchell, Randall J.

“…Sympatric plant species with similar flowering phenologies and floral mor- phologies may compete for pollination, and as a consequence potentially influence…”
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Breeding Systems and Levels of Inbreeding Depression in Geographically Restricted and Widespread Species of Astragalus (Fabaceae) by Karron, Jeffrey D.

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Numbers of sporophytic self-incompatibility alleles in populations of wild radish by Karron, J.D, Marshall, D.L, Oliveras, D.M

“…To estimate the numbers of sporophytic S-alleles in two adjacent populations of wild radish, we performed 701 reciprocal crosses among 50 individuals. Each…”
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Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringens by KARRON, J. D, TUCKER, R, THUMSER, N. N, REINARTZ, J. A

“…Pollinator movements and pollen-mediated gene dispersal were quantified in experimental populations of square-stemmed monkeyflower (Mimulus ringens), a wetland…”
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Fitness consequences of multiple paternity in wild radish, Raphanus sativus by Karron, Jeffrey D., Marshall, Diane L.

“…In natural populations, wild radish plants typically mate with 6-8 pollen donors, and seeds of individual fruits are usually sired by 1-4 fathers. Since radish…”
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Effects of Environmental Variation on Fitness of Singly and Multiply Sired Progenies of Raphanus sativus (Brassicaceae) by Karron, Jeffrey D., Marshall, Diane L.

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Breeding systems and levels of inbreeding depression in geographically restricted and widespread species of Astragalus (Fabaceae) by Karron, J.D

“…Several workers have suggested that species with restricted ranges and few individuals are more likely to be self-compatible and to exhibit low levels of…”
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A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and widespread plant congeners by Karron, Jeffrey D.

“…Evolutionary theory predicts low levels of genetic polymorphism and high levels of self-compatibility in plant species with small ranges and few individuals…”
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Interspecific Variation in the Calls of Spheniscus Penguins by Nina N. Thumser, Karron, Jeffrey D., Ficken, Millicent S.

“…We compared the vocal repertoires of Jackass (Spheniscus demersus), Humboldt (S. humboldti), and Magellanic (S. magellanicus) penguins. Discriminant and…”
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Patterns of multiple paternity in fruits of Mimulus ringens (Phrymaceae) by Mitchell, Randall J, Karron, Jeffrey D, Holmquist, Karsten G, Bell, John M

“…Multiply sired fruits provide unambiguous evidence that pollen from two or more donors was deposited on a stigma and successfully fertilized ovules. Such…”
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Outcrossing rates of individual Mimulus ringens genets are correlated with anther-stigma separation by Karron, J.D, Jackson, R.T, Thumser, N.N, Schlicht, S.L

“…Anther-stigma separation (herkogamy) is highly variable within populations of Mimulus ringens, a bumblebee-pollinated perennial herb with a mixed-mating…”
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Patterns of Genetic Polymorphism in Five Species of Penguins by Nina N. Thumser, Karron, Jeffrey D.

“…Molecular and biochemical approaches may provide valuable information concerning phylogenetic relationships among closely related species. Thumser and Karron…”
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Effects on environmental variation on fitness of singly and multiply sired progenies of Raphanus sativus (Brassicaceae) by Karron, J.D, Marshall, D.L

“…Two hypotheses have been proposed concerning possible fitness advantages of multiple paternity. According to the Elbow Room hypothesis, the magnitude of…”
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Genetic differentiation in the dwarf mistletoes Arceuthobium vaginatum and Arceuthobium americanum on their principal and secondary hosts by Linhart, Y.B, Ellwood, L.M, Karron, J.D, Gehring, J.L

“…Most parasitic dwarf mistletoes (Arceuthobium spp.) are dioecious and can parasitize more than one species of conifer host. In Colorado, Arceuthobium…”
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Genetic Structure of Populations of Geographically Restricted and Widespread Species of Astragalus (Fabaceae) by Karron, Jeffrey D., Linhart, Yan B., Chaulk, Christine A., Robertson, Cliff A.

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