Caterpillar seed predators mediate shifts in selection on flowering phenology in their host plant

Alicia Valdés; Johan Ehrlén

doi:10.1002/ecy.1633

journal article Jan 01, 2017

Caterpillar seed predators mediate shifts in selection on flowering phenology in their host plant

Alicia Valdés Johan Ehrlén

Ecology Vol. 98 No. 1 pp. 228-238 · Wiley

View at Publisher Save 10.1002/ecy.1633

Abstract

AbstractVariation in selection among populations and years has important implications for evolutionary trajectories of populations. Yet, the agents of selection causing this variation have rarely been identified. Selection on the time of reproduction within a season in plants might differ both among populations and among years, and selection can be mediated by both mutualists and antagonists. We investigated if differences in the direction of phenotypic selection on flowering phenology among 20 populations of Gentiana pneumonanthe during 2 yr were related to the presence of the butterfly seed predator Phengaris alcon, and if butterfly incidence was associated with the abundance of the butterfly's second host, Myrmica ants. In plant populations without the butterfly, phenotypic selection favored earlier flowering. In populations where the butterfly was present, caterpillars preferentially attacked early‐flowering individuals, shifting the direction of selection to favoring later flowering. Butterfly incidence in plant populations increased with ant abundance. Our results demonstrate that antagonistic interactions can shift the direction of selection on flowering phenology, and suggest that such shifts might be associated with differences in the community context.

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Details

Published: Jan 01, 2017
Vol/Issue: 98(1)
Pages: 228-238
License: View

Authors

A

Alicia Valdés

Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm SE‐106 91 Sweden

J

Johan Ehrlén

Department of Ecology, Environment and Plant Sciences Stockholm University Stockholm SE‐106 91 Sweden

Funding

Vetenskapsrådet

Fundación para el Fomento en Asturias de la Investigación Científica Aplicada y la Tecnología

Cite This Article

Alicia Valdés, Johan Ehrlén (2017). Caterpillar seed predators mediate shifts in selection on flowering phenology in their host plant. Ecology, 98(1), 228-238. https://doi.org/10.1002/ecy.1633

Caterpillar seed predators mediate shifts in selection on flowering phenology in their host plant

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