M
Mark O. Johnston
Researcher at Dalhousie University
Publications - 49
Citations - 5723
Mark O. Johnston is an academic researcher from Dalhousie University. The author has contributed to research in topics: Selfing & Inbreeding depression. The author has an hindex of 30, co-authored 49 publications receiving 5329 citations. Previous affiliations of Mark O. Johnston include University of Chicago & McGill University.
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Journal ArticleDOI
Pollen limitation of plant reproduction: Ecological and evolutionary causes and consequences
Tia-Lynn Ashman,Tiffany M. Knight,Janette A. Steets,Priyanga Amarasekare,Martin Burd,Diane R. Campbell,Michele R. Dudash,Mark O. Johnston,Susan J. Mazer,Randall J. Mitchell,Martin Morgan,William G. Wilson +11 more
TL;DR: A change in approach is needed to determine whether pollen limitation reflects random fluctuations around a pollen–resource equilibrium, an adaptation to stochastic pollination environments, or a chronic syndrome caused by an environmental perturbation.
Journal ArticleDOI
Pollen Limitation of Plant Reproduction: Pattern and Process
Tiffany M. Knight,Janette A. Steets,Jana C. Vamosi,Susan J. Mazer,Martin Burd,Diane R. Campbell,Michele R. Dudash,Mark O. Johnston,Randall J. Mitchell,Tia-Lynn Ashman +9 more
TL;DR: It is found that the magnitude of pollen limitation observed in natural populations depends on both historical constraints and contemporary ecological factors.
Journal ArticleDOI
Plant mating systems in a changing world.
Christopher G. Eckert,Susan Kalisz,Monica A. Geber,Risa D. Sargent,Elizabeth Elle,Pierre-Olivier Cheptou,Carol Goodwillie,Mark O. Johnston,John K. Kelly,David A. Moeller,Emmanuelle Porcher,Richard H. Ree,Mario Vallejo-Marín,Alice A. Winn +13 more
TL;DR: A meta-analysis of 22 studies involving 27 plant species shows a significant reduction in the proportion of seeds outcrossed in response to anthropogenic habitat modifications, and whether reproductive assurance through selfing effectively compensates for reduced outcrossing is discussed.
Journal ArticleDOI
Natural selection on floral traits in two species of lobelia with different pollinators.
TL;DR: Using both multivariate and univariate regression techniques, selection acting through female reproductive success is measured in two hermaphroditic species with precise pollen placement but different pollinators: hummingbird‐pollinated Lobelia cardinalis and bumblebee‐ pollinated L. siphilitica.
Journal ArticleDOI
Correlated evolution of mating system and floral display traits in flowering plants and its implications for the distribution of mating system variation.
Carol Goodwillie,Risa D. Sargent,Christopher G. Eckert,Elizabeth Elle,Monica A. Geber,Mark O. Johnston,Susan Kalisz,David A. Moeller,Richard H. Ree,Mario Vallejo-Marín,Alice A. Winn +10 more
TL;DR: It is suggested that covariation between mating systems and total allocation to attraction can explain the deviation from expected trade-offs between flower size and number.