Shifts in water availability mediate plant–pollinator interactions

M. Kate Gallagher; Diane R. Campbell

doi:10.1111/nph.14602

journal article May 18, 2017

Shifts in water availability mediate plant–pollinator interactions

M. Kate Gallagher

Diane R. Campbell

New Phytologist Vol. 215 No. 2 pp. 792-802 · Wiley

View at Publisher Save 10.1111/nph.14602

Abstract

SummaryAltered precipitation patterns associated with anthropogenic climate change are expected to have many effects on plants and insect pollinators, but it is unknown if effects on pollination are mediated by changes in water availability. We tested the hypothesis that impacts of climate on plant–pollinator interactions operate through changes in water availability, and specifically that such effects occur through alteration of floral attractants.We manipulated water availability in two naturally occurringMertensia ciliata(Boraginaceae) populations using water addition, water reduction and control plots and measured effects on vegetative and floral traits, pollinator visitation and seed set.While most floral trait values, including corolla size and nectar, increased linearly with increasing water availability, in this bumblebee‐pollinated species, pollinator visitation peaked at intermediate water levels. Visitation also peaked at an intermediate corolla length, while its relationship to corolla width varied across sites. Seed set, however, increased linearly with water.These results demonstrate the potential for changes in water availability to impact plant–pollinator interactions through pollinator responses to differences in floral attractants, and that the effects of water on pollinator visitation can be nonlinear. Plant responses to changes in resource availability may be an important mechanism by which climate change will affect species interactions.

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Details

Published: May 18, 2017
Vol/Issue: 215(2)
Pages: 792-802
License: View

Authors

M

M. Kate Gallagher

Department of Ecology and Evolutionary Biology University of California 321 Steinhaus Hall Irvine CA 92697‐2525 USA; Rocky Mountain Biological Laboratory Crested Butte CO 81224 USA

D

Diane R. Campbell

Department of Ecology and Evolutionary Biology University of California 321 Steinhaus Hall Irvine CA 92697‐2525 USA; Rocky Mountain Biological Laboratory Crested Butte CO 81224 USA

Funding

National Science Foundation Award: DEB‐1601191

Botanical Society of America

Rocky Mountain Biological Laboratory

Western Ag., Inc.

Cite This Article

M. Kate Gallagher, Diane R. Campbell (2017). Shifts in water availability mediate plant–pollinator interactions. New Phytologist, 215(2), 792-802. https://doi.org/10.1111/nph.14602

Shifts in water availability mediate plant–pollinator interactions

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