Influence of pollen transport dynamics on sire profiles and multiple paternity in flowering plants

• Published in: PloS one Vol. 8; no. 10; p. e76312
• Main Authors: Mitchell, Randall J, Wilson, William G, Holmquist, Karsten G, Karron, Jeffrey D
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 03-10-2013; Public Library of Science (PLoS)
• Subjects: Algorithms; Animal behavior; Animal reproduction; Animals; Bees; Biology; Birds; Comparative analysis; Ecology; Evolution; Exports; Flowering; Flowering plants; Flowers; Flowers & plants; Flowers - physiology; Fruit; Fruits; Influence; Ipomopsis aggregata; Mathematical models; Mimulus ringens; Models, Biological; Paternity; Phrymaceae; Plant Physiological Phenomena; Plant reproduction; Plant sciences; Plants (botany); Pollen; Pollination; Pollinators; Predictions; Reproducibility of Results; Seeds; Success; United States > US; Wisconsin
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0076312

In many flowering plants individual fruits contain a mixture of half- and full- siblings, reflecting pollination by several fathers. To better understand the mechanisms generating multiple paternity within fruits we present a theoretical framework linking pollen carryover with patterns of pollinator movement. This 'sire profile' model predicts that species with more extensive pollen carryover will have a greater number of mates. It also predicts that flowers on large displays, which are often probed consecutively during a single pollinator visitation sequence, will have a lower effective number of mates. We compared these predictions with observed values for bumble bee-pollinated Mimulus ringens, which has restricted carryover, and hummingbird-pollinated Ipomopsis aggregata, which has extensive carryover. The model correctly predicted that the effective number of mates is much higher in the species with more extensive carryover. This work extends our knowledge of plant mating systems by highlighting mechanisms influencing the genetic composition of sibships.