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Arthropod-Plant Interactions

, Volume 13, Issue 1, pp 99–108 | Cite as

Seasonal assembly of arthropod communities on milkweeds experiencing simulated herbivory

  • Ian S. PearseEmail author
  • Marshall McMunn
  • Louie H. Yang
Original Paper
  • 62 Downloads

Abstract

The seasonal assembly of arthropod communities is shaped by biotic and abiotic aspects of the habitat that limit the appearance or activity phenology of potential community members. In addition, previous interactions within the community, such as herbivore-induced plant defensive responses, aggregation, and predator avoidance likely affect the assembly of arthropod communities on individual plants. We observed the phenology of arthropod communities and defensive plant traits on 100 milkweed (Asclepias eriocarpa) individuals at monthly intervals over a growing season. We experimentally wounded a subset of plants each month (April–August) to observe the effect of simulated added herbivore damage on the seasonal assembly of these arthropod communities. All plant traits and measures of arthropod communities changed over the season. The observed response to experimental leaf damage suggested a trend of induced susceptibility in early months, but not late months. Plants receiving early-season simulated herbivory experienced more subsequent leaf damage than unmanipulated plants. We observed several lagged correlations in our study indicating that blue milkweed beetle (Chrysochus cobaltinus) abundance was lower in months following high natural leaf damage, and that the abundance of a secondary omnivore (Lygaeus kalmii) and total predator abundance tended to follow months with high C. cobaltinus abundance. Ahistorical habitat factors determined much of the observed seasonality of arthropod communities, but induced responses to simulated herbivory also contributed historical effects that influenced arthropod community assembly.

Keywords

Milkweed Phenology Community assembly Historical contingency Environmental filter Induced responses to herbivory 

Notes

Acknowledgements

We thank Vince Voegeli and the UC Natural Reserves system for access to Hastings Natural History Reserve. Griffin Hall, Lindsay Brandt, Jill Baty, and Sandra Ferguson helped with arthropod surveys. David Zaya provided useful advice on statistics. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This project was supported in part by a National Science Foundation (NSF) CAREER Grant (DEB-1253101) awarded to LHY. The data and analyses for the study were archived on USGS ScienceBase  https://doi.org/10.5066/P99MQF8J.

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Copyright information

© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2018

Authors and Affiliations

  • Ian S. Pearse
    • 1
    Email author
  • Marshall McMunn
    • 2
  • Louie H. Yang
    • 2
  1. 1.Fort Collins Science CenterU.S. Geological SurveyFt CollinsUSA
  2. 2.Department of Entomology and NematologyUniversity of California, DavisDavisUSA

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