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Severe limitations of the FEve metric of functional evenness and some alternative metrics
  • Evsey Kosman,
  • Samuel Scheiner,
  • Hans-Rolf Gregorius
Evsey Kosman
Tel Aviv University
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Samuel Scheiner
National Science Foundation
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Hans-Rolf Gregorius
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Abstract

1. The metric of functional evenness FEve is an example of how approaches to conceptualizing and measuring functional variability may go astray. 2. The index of functional evenness FEve has critical conceptual and practical drawbacks: a) Different values of the FEve index for the same community can be obtained if the species have unequal species abundances; this result is highly likely if most of the traits are categorical. b) Very minor differences in even one pairwise distance can result in very different values of FEve. c) FEve uses only a fraction of the information contained in the matrix of species distances. Counterintuitively, this can cause very similar FEve scores for communities with substantially different patterns of species dispersal in trait space. d) FEve is a valid metric only if all species have exactly the same abundances. However, the meaning of FEve in such an instance is unclear as the purpose of the metric is to measure the variability of abundances in trait space. 3. We recommend not using FEve metric in studies of functional variability. Given the wide usage of FEve index over the last decade, the validity of the conclusions based on those estimates are in question. 4. Instead, we suggest three alternative metrics that combines variability in species distances in trait space with abundance in various ways, and more broadly recommend that researchers think about which community properties (e.g., trait-distances of a focus species to the nearest neighbor or all other species, variability of pairwise interactions between species) they want to measure and pick from among the appropriate metrics.

Peer review status:UNDER REVIEW

12 Aug 2020Submitted to Ecology and Evolution
14 Aug 2020Assigned to Editor
14 Aug 2020Submission Checks Completed
18 Aug 2020Review(s) Completed, Editorial Evaluation Pending