Community stability and selective extinction during the Permian-Triassic mass extinction

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Science  02 Oct 2015:
Vol. 350, Issue 6256, pp. 90-93
DOI: 10.1126/science.aab1371
  • Fig. 1 Guild interactions and alternative models.

    (A) Beaufort Group food web. Guild richnesses are listed in table S2. (B to F) Food web models: (B) Example paleocommunity web, with four guilds and two species per guild. Blue arrows, guild interactions; black arrows, species interactions. (C to F) Alternative models of community organization.

  • Fig. 2 Beaufort Group paleocommunity compositions.

    (Right) Gray bars represent the extinction stages; missing bars indicate that richness was zero. Total amniote species are subdivided by body size. (Left) Correlations between Beaufort Group assemblage zones and the geological time scale. The subdivisions of the Dicynodon assemblage zone, illustrated as of equal length, were of unequal durations (10). Stratigraphic units: Ans, Anisian; Cap, Capitanian; Chx, Changhsingian; Ind, Induan; Ole, Olenekian; Wuc, Wuchiapingian. Assemblage zones: Cist, Cistecephalus; Cyno, Cynognathus; Dicyn, Dicynodon; Lyst, Lystrosaurus assemblage zone; Prist, Pristerognathus; Trop, Tropidostoma.

  • Fig. 3 Paleocommunities and alternative model transient dynamics.

    (A and B) DAZ Ph0; (C and D) Ph1; (E and F) Ph2; (G and H) LAZ (see text for explanation). Colors correspond to models illustrated in Fig. 1, B to F; deep blue are paleocommunity results. Lines represent median of 100 simulations per model, and filled envelopes are 25th and 75th percentiles.

  • Fig. 4 Comparison of Ph1 and simulated extinctions.

    (A) NMDS ordination of Ph1 (blue) and simulated (orange) communities. Oval is 95% confidence bound of simulated communities. (B) Transient dynamic amplification of paleocommunity and simulated communities.

Supplementary Materials

  • Community stability and selective extinction during the Permian-Triassic mass extinction

    Peter D. Roopnarine, Kenneth D. Angielczyk

    Materials/Methods, Supplementary Text, Tables, Figures, and/or References

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    • Materials and Methods
    Table S1
    Vertebrate taxa assigned to assemblage zone paleocommunities.
    Table S2
    List of guilds and guild richnesses of each paleocommunity.
    Table S3
    Guild interactions binary matrix.
    Table S4
    Summary transient stability statistics for all paleocommunities.

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