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Shifts in water availability mediate plant-pollinator interactions.

M Kate Gallagher1,2, Diane R Campbell1,2

  • 1Department of Ecology and Evolutionary Biology, University of California, 321 Steinhaus Hall, Irvine, CA, 92697-2525, USA.

The New Phytologist
|May 19, 2017
PubMed
Summary

Climate change alters water availability, impacting plant-pollinator interactions. Water levels affect floral traits and pollinator visits, with seed set increasing linearly with water. This highlights water as a key mediator in species interactions.

Keywords:
BombusMertensia ciliataBoraginaceaeclimate changeflower sizemutualismplant-pollinator interactionsprecipitation manipulation

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Area of Science:

  • Ecology
  • Plant Biology
  • Climate Change Research

Background:

  • Anthropogenic climate change is altering precipitation patterns globally.
  • The impact of these changes on plant-pollinator interactions, particularly through water availability, remains understudied.
  • Floral attractants are crucial for mediating plant-pollinator relationships.

Purpose of the Study:

  • To test if climate change impacts on plant-pollinator interactions are mediated by water availability.
  • To investigate how water availability influences floral traits and pollinator visitation.
  • To determine the relationship between water availability, floral traits, and seed set in Mertensia ciliata.

Main Methods:

  • Field experiment manipulating water availability (addition, reduction, control) in Mertensia ciliata populations.
  • Measurement of vegetative and floral traits, including corolla size and nectar.
  • Quantification of pollinator (bumblebee) visitation rates and seed set.

Main Results:

  • Floral traits like corolla size and nectar increased linearly with water availability.
  • Pollinator visitation rates peaked at intermediate water levels and intermediate corolla length.
  • Seed set showed a linear increase with water availability, demonstrating nonlinear effects on visitation.

Conclusions:

  • Water availability significantly impacts plant-pollinator interactions by altering floral attractants.
  • Pollinator responses to floral trait changes mediated by water availability can be nonlinear.
  • Plant responses to water availability are a critical mechanism through which climate change affects species interactions.