Oecologia

, Volume 168, Issue 2, pp 483–489

The relative influences of host plant genotype and yearly abiotic variability in determining herbivore abundance

  • Luke M. Evans
  • James S. Clark
  • Amy V. Whipple
  • Thomas G. Whitham
Plant-Animal interactions - Original Paper

DOI: 10.1007/s00442-011-2108-8

Cite this article as:
Evans, L.M., Clark, J.S., Whipple, A.V. et al. Oecologia (2012) 168: 483. doi:10.1007/s00442-011-2108-8

Abstract

Both plant genotype and yearly abiotic variation affect herbivore population sizes, but long-term data have rarely been used to contrast the relative contributions of each. Using a hierarchical Bayesian model, we directly compare effects of these two factors on the population size of a common herbivore, Aceria parapopuli, on Populus angustifolia × fremontii F1 hybrid trees growing in a common garden across 8 years. Several patterns emerged. First, the Bayesian posterior estimates of tree genotype effects on mite gall number ranged from 0.0043 to 229 on a linear scale. Second, year effect sizes across 8 years of study ranged from 0.133 to 1.895. Third, in comparing the magnitudes of genotypic versus yearly variation, we found that genotypic variation was over 130 times greater than variation among years. Fourth, precipitation in the previous year negatively affected gall abundances, but was minimal compared to tree genotype effects. These findings demonstrate the relative importance of tree genotypic variation in determining herbivore population size. However, given the demonstrated sensitivity of cottonwoods to drought, the loss of individual tree genotypes from an altered climate would have catastrophic impacts on mites that are dependent upon these genotypes for their survival.

Keywords

Populus Aceria parapopuli Hierarchical model Genotypic effects Annual variation 

Supplementary material

442_2011_2108_MOESM1_ESM.doc (722 kb)
Supplementary material 1 (DOC 721 kb)

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Luke M. Evans
    • 1
  • James S. Clark
    • 2
  • Amy V. Whipple
    • 1
  • Thomas G. Whitham
    • 1
  1. 1.Department of Biological Sciences, The Environmental Genetics and Genomics Laboratory and the Merriam-Powell Center for Environmental ResearchNorthern Arizona UniversityFlagstaffUSA
  2. 2.Department of Biology and Nicholas School of the Environment, and University Program in EcologyDuke UniversityDurhamUSA

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