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Prevalence and predictability of handling effects on plants in field studies: Results from field experiments and a meta-analysis Open Access

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Author or creator
Hik, D.S.
Brown, M.
Dabros, A.
Weir, J.
Cahill, J.F.
Additional contributors
Subject/Keyword
thigmomorphogenesis
old field
boreal forests
meta-analysis
alpine meadows
grasslands
observer effect
visitation
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Various effects on plant growth associated with handling or touching plants are well documented from greenhouse and laboratory studies, but are generally unknown or ignored under field conditions. We examined the prevalence of the effects of handling, at levels typical of many ecological experiments, on aboveground biomass and damage by invertebrate herbivores for a total of 16 common species from three plant communities in western Canada. Significant effects of handling were observed in the alpine meadow and grassland, but not in the boreal forest. Handling reduced aboveground biomass and increased the mean intensity of invertebrate leaf damage for most species. A meta-analysis of the relationship between plant traits and response to handling indicated that woody plants and species without strong chemical or conspicuous morphological defenses were most strongly affected. Overall, our results indicate that potentially confounding effects of routinely sampling plants in the field are widespread and merit further investigation.
Date created
2003
License information
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This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Hik, D.S, Brown, M., Dabros, A., Weir, J. and Cahill,J.F. Jr. "Prevalence and predictability of handling effects on plants in field studies: Results from field experiments and a meta-analysis ." American Journal of Botany 90 (2003): 270-277. DOI: 10.3732/ajb.90.2.270
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