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On quantifying tolerance of herbivory for comparative analyses.

Michael J Wise1, David E Carr

  • 1Department of Biology, Bucknell University, Lewisburg, Pennsylvania 17837, USA. mwise@bucknell.edu

Evolution; International Journal of Organic Evolution
|July 22, 2008
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Summary

When comparing plant tolerance to herbivory, researchers must use consistent measurement scales for plant damage and performance. Inconsistent scales can lead to incorrect conclusions about which plant groups are more tolerant.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Plant Science

Background:

  • Plant tolerance to herbivory is crucial for understanding plant evolution.
  • Comparative studies assessing plant tolerance are increasing across various plant groups and environments.

Purpose of the Study:

  • To highlight the critical importance of measurement scale selection in comparative studies of plant tolerance.
  • To demonstrate how different scales can lead to contradictory conclusions using the same data.

Main Methods:

  • The study used a simulated dataset of two plant groups with equal tolerance.
  • Analysis involved applying different measurement scales (additive vs. multiplicative) to plant damage and performance data.

Main Results:

  • The choice of measurement scale significantly influenced the inferred tolerance levels between the two plant groups.
  • Identical datasets yielded conclusions of Group 1 being more tolerant, Group 2 being more tolerant, or equal tolerance depending on the scale used.

Conclusions:

  • Reliable comparisons of plant tolerance require consistent measurement scales for both damage and performance.
  • Additive or multiplicative scales should be used consistently for both damage and performance metrics to ensure logical consistency.