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Ordination analyses using 511 faunal lists that include 967 species (190 genera) from the Kungurian through the Capitanian Stages of the Guadalupe and Glass Mountains (\u223c15 myr) reveal four distinct, major stratigraphic clusters, each divisible into two to three subclusters. For the most part, these clusters coincide with third-order depositional sequences bounded by unconformities. Except for the youngest (Capitanian Stage), all the stratigraphic clusters show internal ordination patterns consistent with biogeographic and environmental (i.e., biotic gradients) control on the distribution of taxa. Despite this evidence for environmental sorting of taxa, Mantel tests indicate that patterns of generic co-occurrence break down from cluster to cluster despite sharing many of the same species and genera. This pattern cannot easily be explained by preservational or stratigraphic biases, suggesting that the processes that govern ecological communities may not lead to unique, strictly determined associations despite the presence of broadly similar species under similar environmental conditions. In contrast to the rest of the study interval, Capitanian clusters are less well structured (i.e., they do not show strong biotic gradients) than assemblages from any of the other clusters and do not show significant recurrence of generic associations. This may reflect evolution of carbonate margins in the basin from ramps to shelves with steep slopes over the duration of the study interval, a shift that may have changed the spatial distribution of (and covariation among) the environmental parameters that controlled brachiopod distributions.<\/jats:p>","DOI":"10.2110\/palo.2008.p08-061r","type":"journal-article","created":{"date-parts":[[2009,2,7]],"date-time":"2009-02-07T02:35:15Z","timestamp":1233974115000},"page":"27-40","source":"Crossref","is-referenced-by-count":23,"title":["CHANGE AND STABILITY IN PERMIAN BRACHIOPOD COMMUNITIES FROM WESTERN TEXAS"],"prefix":"10.2110","volume":"24","author":[{"given":"THOMAS D.","family":"OLSZEWSKI","sequence":"first","affiliation":[{"name":"1Texas A&M University, Department of Geology and Geophysics and Interdisciplinary Research Program in Ecology and Evolutionary Biology, College Station, Texas 77843-3115, USA;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"DOUGLAS H.","family":"ERWIN","sequence":"additional","affiliation":[{"name":"2Smithsonian Institution, Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20013, USA, and Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, New Mexico 87501, USAtomo@geo.tamu.edu"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"860","published-online":{"date-parts":[[2009,1,1]]},"reference":[{"key":"2026052723463048400_I0883-1351-24-1-27-ALROY1","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1126\/science.1156963","article-title":"Phanerozoic trends in the global diversity of marine invertebrates","volume":"321","author":"Alroy","year":"2008","journal-title":"Science"},{"key":"2026052723463048400_I0883-1351-24-1-27-ALROY2","doi-asserted-by":"crossref","unstructured":"Alroy, J., Marshall, C.R., Bambach, R.K., Bezusko, K., Foote, M., Fu\u0308rsich, F.T., Hansen, T.A., Holland, S.M., Ivany, L.C., Jablonski, D., Jacobs, D.K., Jones, D.C., Kosnik, M.A., Lidgard, S., Low, S., Miller, A.I., Novack-Gottshall, P.M., Olszewski, T.D., Patzkowsky, M.E., Raup, D.M., Roy, K., Sepkoski, J.J., Jr., Sommers, M.G., Wagner, P.J., and Webber, A., 2001, Effects of sampling standardization on estimates of Phanerozoic marine diversification: Proceedings of the National Academy of Sciences, USA, 98. 6261\u20136266.","DOI":"10.1073\/pnas.111144698"},{"key":"2026052723463048400_I0883-1351-24-1-27-BAUMILLER1","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1016\/S0031-0182(96)00091-0","article-title":"Exploring the pattern of coordinated stasis: Simulations and extinction scenarios","volume":"127","author":"Baumiller","year":"1996","journal-title":"Palaeogeography, Palaeoclimatology, Palaeoecology"},{"key":"2026052723463048400_I0883-1351-24-1-27-BONUSO1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/S0031-0182(02)00298-5","article-title":"Statistical testing of community patterns; 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