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Edge effects and mating patterns in a bumblebee-pollinated plant.

Dorothy A Christopher1, Randall J Mitchell2, Dorset W Trapnell3

  • 1Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.

Aob PLANTS
|August 4, 2020
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Summary

Plant location, whether edge or interior, did not significantly impact seed production or mating success. However, edge plants experienced altered pollinator behavior, leading to increased pollen-mediated gene dispersal.

Keywords:
Edge effectsMimulusgene dispersalmate diversitymonkeyflowerpaternitypollinationseed setsiring successspatial location

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Area of Science:

  • Ecology
  • Plant Biology
  • Evolutionary Biology

Background:

  • Plant spatial arrangement, particularly edge effects, is hypothesized to influence reproductive success and pollinator behavior.
  • Edge populations may have reduced mating opportunities and increased vulnerability to pollinator limitations.
  • Previous assumptions suggest edge effects significantly impact plant reproduction and gene flow.

Purpose of the Study:

  • To investigate the impact of spatial location (edge vs. interior) on reproductive success in *Mimulus ringens*.
  • To analyze pollinator foraging patterns in relation to plant location.
  • To quantify pollen-mediated gene dispersal differences between edge and interior plants.

Main Methods:

  • Established a square experimental array of 49 *Mimulus ringens* plants.
  • Observed bumblebee foraging patterns and visitation rates.
  • Utilized paternity analysis to assess male and female reproductive success and mate diversity.

Main Results:

  • No significant differences were found in siring success, seed production, or sire diversity between edge and interior plants.
  • Edge plants showed 15% lower per flower visitation rates and longer interplant movements by pollinators.
  • Pollen-mediated gene dispersal was 40% greater for edge plants compared to interior plants.

Conclusions:

  • Edge effects on plant reproductive success may be less pronounced than commonly assumed.
  • Different components of plant reproduction respond independently to spatial location.
  • Altered pollinator behavior at edges can enhance pollen dispersal despite no direct impact on seed set.