Ecological Archives E093-178-A5

Jeannine Cavender-Bares and Peter B. Reich. 2012. Shocks to the system: community assembly of the oak savanna in a 40-year fire frequency experiment. Ecology 93:S52–S69. http://dx.doi.org/10.1890/11-0502.1

Appendix E. Comparison of phylogenetic diversity metrics calculated from different phylogenies.

TABLE E1. Comparison of community phylogenetic diversity metrics (phylogenetic species variance, PSV, Helmus 2007; mean phylogenetic distance, MPD, Webb 2000; and mean nearest taxon distance, MNTD, Webb 2000) computed for three phylogenetic hypothesis (CCPhy, EcoPhyWG, and Willis et al. 2010). Mean observed values +/- standard errors for each fire treatment and each year are shown on the left; shown to the right are standardized effect sizes +/- standard errors calculated relative to a null model in which species abundance values were randomized across communities, with total abundance per species and total number of occurrences constrained. Fire frequency categories vary from 0 (unburned communities) to 4 (burned 7–8 times per decade). PSV and MPD for all three phylogenies was lowest in the unburned communities and highest in the most frequently burned communities. MNTD consistently showed higher values in the unburned communities than in the burn treatments. MNTD also consistently showed a decline in 1990 following a major climatic perturbation.

Table E1

LITERATURE CITED

Webb, C. O. 2000. Exploring the phylogenetic structure of ecological communities: An example for rain forest trees. American Naturalist 156:145–155.

Helmus, M. R. 2007. Phylogenetic measures of biodiversity. American Naturalist 169:E68–E83.


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