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Evenness of Cambrian-Ordovician benthic marine communities in North America
Published online by Cambridge University Press: 08 February 2016
Abstract
Biodiversity has two principal components: richness (the number of taxa) and evenness (the distribution of individuals among taxa). Both of these attributes are critical in defining community composition and structure, but evenness may be particularly important for ecological reasons, especially in the context of a possible evolutionary increase in richness. Here I examine abundance data in well-preserved Cambrian and Ordovician benthic marine assemblages from mixed carbonate-shale and shale lithofacies deposited below normal wave base in North America. Evenness increases significantly from the Cambrian to the Ordovician in these assemblage data. The increase cannot easily be attributed to differences in sample size, lithology, water depth, or other sample characteristics. There is relatively little variation in evenness among stages within the Cambrian and Ordovician periods. Much of the within-period variance in evenness appears to arise from environmental and / or taphonomic differences that may exist between stratigraphic formations, but some variance may also be ascribed to the degree of taxonomic and / or ecological overlap among dominant taxa. Specifically, assemblages that are co-dominated by taxa from the same class or order tend to have lower evenness than assemblages dominated by genera from different higher taxa, but the effect is not strong in these data.
The Cambrian and Paleozoic evolutionary faunas show similar, but out-of-phase, patterns of evenness within assemblages. Both faunas have comparably low evenness early in their history but then increase to similar, higher evenness values. In the case of the Cambrian fauna, the increase occurs in the Late Cambrian or Early Ordovician. In the Paleozoic fauna, the increase appears to occur after the lower Arenigian.
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Literature Cited
Alroy, J., Marshall, C. R., Bambach, R. K., Bezusko, K., Foote, M., Fürsich, 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., 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 98:6261–6266.CrossRefGoogle ScholarPubMed
Ausich, W. I., and Bottjer, D. J. 1982. Tiering in suspension-feeding communities on soft substrata throughout the Phanerozoic. Science 216:173–174.CrossRefGoogle ScholarPubMed
Bambach, R. K. 1977. Species richness in marine benthic habitats through the Phanerozoic. Paleobiology 3:152–167.CrossRefGoogle Scholar
Bambach, R. K. 1983. Classes and adaptive variety: the ecology of diversification in marine faunas through the Phanerozoic. Pp. 719–746in Tevesz, and McCall, 1983.Google Scholar
Bennington, J. B. 2003. Transcending patchiness in the comparative analysis of paleocommunities: a test case from the Upper Cretaceous of New Jersey. Palaios 18:22–33.2.0.CO;2>CrossRefGoogle Scholar
Bennington, J. B., and Rutherford, S. D. 1999. Precision and reliability in paleocommunity comparisons based on cluster-confidence intervals; how to get more statistical bang for your sampling buck. Palaios 14:506–515.CrossRefGoogle Scholar
Best, M. M. R., and Kidwell, S. M. 2000. Bivalve taphonomy in tropical mixed siliciclastic-carbonate settings. I. Environmental variation in shell condition. Paleobiology 26:80–102.2.0.CO;2>CrossRefGoogle Scholar
Brett, C. E., and Baird, G. C. 1986. Comparative taphonomy: a key to paleoenvironmental interpretation based on fossil preservation. Palaios 1:207–227.CrossRefGoogle Scholar
Brett, C. E., Speyer, S. E., and Baird, G. C. 1986. Storm-generated sedimentary units: tempestite proximality and event stratification in the Middle Devonian Hamilton Group of New York. Mew York State Museum Bulletin 457:129–156.Google Scholar
Brown, J. H., and Maurer, B. A. 1986. Body size, ecological dominance and Cope's rule. Nature 324:248–250.CrossRefGoogle Scholar
Brown, W. L., and Wilson, E. O. 1956. Character displacement. Systematic Zoology 5:49–64.CrossRefGoogle Scholar
Cardinale, B. J., Palmer, M. A., and Collins, S. L. 2002. Species diversity enhances ecosystem function through interspecific facilitation. Nature 415:426–429.CrossRefGoogle ScholarPubMed
Cherns, L., and Wright, V. P. 2000. Missing mollusks as evidence of large-scale, early skeletal aragonite dissolution in a Silurian Sea. Geology 28:791–794.2.0.CO;2>CrossRefGoogle Scholar
Connolly, S. R., and Miller, A. I. 2001. Global Ordovician faunal transitions in the marine benthos: proximate causes. Paleobiology 27:779–795.2.0.CO;2>CrossRefGoogle Scholar
Connolly, S. R., and Miller, A. I. 2002. Global Ordovician faunal transitions in the marine benthos: ultimate causes. Paleobiology 28:26–40.2.0.CO;2>CrossRefGoogle Scholar
Cotgreave, P., and Harvey, P. H. 1992. Relationships between body size, abundance, and phylogeny in bird communities. Functional Ecology 6:248–256.CrossRefGoogle Scholar
Connolly, S. R., and Miller, A. I. 1994. Evenness of abundance in bird communities. Journal of Animal Ecology 63:365–374.Google Scholar
Drobner, U., Bibby, J., Smith, B., and Wilson, J. B. 1998. The relation between community biomass and evenness: what does community theory predict, and can these predictions be tested? Oikos 82:295–302.CrossRefGoogle Scholar
Droser, M. L., and Bottjer, D. J. 1989. Ordovician increase in extent and depth of bioturbation: implications for understanding early Paleozoic ecospace utilization. Geology 17:850–852.2.3.CO;2>CrossRefGoogle Scholar
Droser, M. L., Fortey, R. A., and Li, X. 1996. The Ordovician radiation. American Scientist 84:122–131.Google Scholar
Ellingsen, K. E. 2002. Soft-sediment benthic biodiversity on the continental shelf in relation to environmental variability. Marine Ecology Progress Series 232:15–27.CrossRefGoogle Scholar
Erwin, D. H., Valentine, J. W., and Sepkoski, J. J. Jr. 1987. A comparative study of diversification events: the early Paleozoic versus the Mesozoic. Evolution 41:1177–1186.CrossRefGoogle ScholarPubMed
Finnegan, S., and Droser, M. L. 2001. Community-level diversity/abundance trends across the Lower / Middle Ordovician boundary in the Great Basin: field-based approaches to the recognition and quantification of paleoecological change. Geological Society of America Abstracts with Programs 33:249.Google Scholar
Foote, M. 1990. Nearest-neighbor analysis of trilobite morphospace. Systematic Zoology 39:371–382.CrossRefGoogle Scholar
Foote, M. 1991. Morphological patterns of diversification—examples from trilobites. Palaeontology 34:461–485.Google Scholar
Gilinsky, N. L., and Bennington, J. B. 1994. Estimating numbers of whole individuals from collections of body parts: a taphonomic limitation of the paleontological record. Paleobiology 20:245–258.CrossRefGoogle Scholar
Hayek, C. L., and Buzas, M. A. 1997. Surveying natural populations. Columbia University Press, New York.Google Scholar
Hurlburt, S. H. 1971. The nonconcept of species diversity: a critique and alternative parameters. Ecology 52:577–586.CrossRefGoogle Scholar
Jernvall, J., and Wright, P. C. 1998. Diversity components of impending primate extinctions. Proceedings of the National Academy of Sciences USA 95:11279–11283.CrossRefGoogle ScholarPubMed
Kidwell, S. M. 1986. Models for fossil concentrations: paleobiology: implications. Paleobiology 12:6–24.CrossRefGoogle Scholar
Kidwell, S. M. 2001. Preservation of species abundance in marine death populations. Science 294:1091–1094.CrossRefGoogle Scholar
Kidwell, S. M. 2002. Time-averaged molluscan death assemblages: palimpsests of richness, snapshots of abundance. Geology 30:803–806.2.0.CO;2>CrossRefGoogle Scholar
Kidwell, S. M., and Jablonski, D. 1983. Taphonomic feedback: ecological consequences of shell accumulation. Pp. 195–248in Tevesz, and McCall, 1983.Google Scholar
Li, X., and Droser, M. L. 1997. Nature and distribution of Cambrian shell concentrations: evidence from the Basin and Range Province of the western United States (California, Nevada, and Utah). Palaios 12:111–126.CrossRefGoogle Scholar
Li, X., and Droser, M. L. 1999. Lower and Middle Ordovician shell beds from the Basin and Range Province of the western United States (California, Nevada, and Utah). Palaios 14:215–233.CrossRefGoogle Scholar
Lockwood, R. 2003. Abundance not linked to survival across the end-Cretaceous mass extinction: patterns in North America bivalves. Proceedings of the National Academy of Sciences USA 100:2478–2482.CrossRefGoogle Scholar
McDowell, R. R. 1995. Depositional history of a Middle Ordovician, mixed carbonate-clastic unit; the Kanosh Formation, eastern Great Basin, U.S.A. In Cooper, J. D., Droser, M. L., and Finney, S. C., eds. Ordovician odyssey. Short papers for the seventh international symposium on the Ordovician System, Field Trip Guidebook 77:367–370.Google Scholar
Miller, A. I. 1988. Spatial resolution in subfossil molluscan remains: implications for paleobiological analyses. Paleobiology 14:91–103.CrossRefGoogle Scholar
Miller, A. I. 1997a. Dissecting global diversity patterns: examples from the Ordovician radiation. Annual Review of Ecology and Systematics 28:85–104.CrossRefGoogle ScholarPubMed
Miller, A. I. 1997b. A new look at age and area: the geographic and environmental expansion of genera during the Ordovician radiation. Paleobiology 23:410–419.CrossRefGoogle Scholar
Miller, A. I. 1997c. Counting fossils in a Cincinnatian storm bed: spatial resolution in the fossil record. Pp. 57–72in Brett, C. E. and Baird, G. C., eds. Paleontological events: stratigraphic, ecological, and evolutionary implications. Columbia University Press, NY.Google Scholar
Miller, A. I., and Connolly, S. 2001. Substrate affinities of higher taxa and the Ordovician Radiation. Paleobiology 27:768–778.2.0.CO;2>CrossRefGoogle Scholar
Miller, A. I., and Foote, M. 1996. Calibrating the Ordovician radiation of marine life: implications for Phanerozoic diversity trends. Paleobiology 22:304–309.CrossRefGoogle ScholarPubMed
Miller, A. I., and Mao, S. 1995. Association of orogenic activity with the Ordovician radiation of marine life. Geology 23:305–308.2.3.CO;2>CrossRefGoogle ScholarPubMed
Peters, S. E. 2001. The evenness and richness components of taxonomic diversity. Geological Society of America Abstracts with Programs 33:A141.Google Scholar
Peters, S. E., and Foote, M. 2001. Biodiversity in the Phanerozoic: a reinterpretation. Paleobiology 27:583–601.2.0.CO;2>CrossRefGoogle Scholar
Powell, M. G., and Kowalewski, M. 2002. Increase in evenness and sampled alpha diversity through the Phanerozoic: comparison of early Paleozoic and Cenozoic marine fossil assemblages. Geology 30:331–334.2.0.CO;2>CrossRefGoogle Scholar
Sepkoski, J. J. Jr. 1981. A factor analytic description of the Phanerozoic marine fossil record. Paleobiology 7:36–53.CrossRefGoogle Scholar
Sepkoski, J. J. Jr. 1988. Alpha, beta, or gamma: where does all the diversity go? Paleobiology 14:221–234.CrossRefGoogle ScholarPubMed
Sepkoski, J. J. Jr. 1991. A model of onshore-offshore change in faunal diversity. Paleobiology 17:68–77.CrossRefGoogle Scholar
Sepkoski, J. J. Jr. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363, 560 p.Google Scholar
Sepkoski, J. J. Jr. and Miller, A. I. 1985. Evolutionary faunas and the distribution of Paleozoic benthic communities in space and time. Pp. 393–396in Valentine, J. W., ed. Phanerozoic diversity patterns. Princeton University Press, Princeton, N.J.Google Scholar
Sepkoski, J. J. Jr. and Sheehan, P. M. 1983. Diversification, faunal change, and community replacement during the Ordovician radiations. Pp. 673–718in Tevesz, and McCall, 1983.Google Scholar
Smith, B., and Wilson, J. B. 1996. A consumer's guide to evenness indices. Oikos 76:70–82.CrossRefGoogle Scholar
Smith, L. H., and Bunje, P. M. 1999. Morphologic diversity of inarticulate brachiopods through the Phanerozoic. Paleobiology 25:396–408.CrossRefGoogle Scholar
Speyer, S. E., and Brett, C. E. 1986. Trilobite taphonomy and Middle Devonian taphofacies. Palaios 1:312–327.CrossRefGoogle Scholar
Stevens, R. D., and Willig, M. R. 2000. Community structure, abundance, and morphology. Oikos 88:48–56.CrossRefGoogle Scholar
Stirling, G., and Wilsey, B. 2001. Empirical relationships between species richness, evenness, and proportional diversity. American Naturalist 158:286–299.CrossRefGoogle ScholarPubMed
Tevesz, M. J. S., and McCall, P. L., eds. 1983. Biotic interactions in recent and fossil benthic communities. Plenum, NY.CrossRefGoogle Scholar
Valentine, J. W., Jablonski, D. J., and Erwin, D. H. 1999. Fossils, molecules and embryos: new perspectives on the Cambrian explosion. Development 126:851–859.CrossRefGoogle ScholarPubMed
Webby, B. D. 1998. Steps towards a global standard for Ordovician stratigraphy. Newsletters on Stratigraphy 36:1–33.CrossRefGoogle Scholar
Westrop, S. R., and Adrain, J. M. 1998. Trilobite alpha diversity and the reorganization of Ordovician benthic marine communities. Paleobiology 24:1–16.CrossRefGoogle Scholar
Westrop, S. R., Tremblay, J. V., and Landing, E. 1995. Declining importance of trilobites in Ordovician nearshore paleocommunities: dilution of displacement? Palaios 10:75–79.CrossRefGoogle Scholar
Wilsey, B. J., and Potvin, C. 2000. Biodiversity and ecosystem functioning: importance of species evenness in an old field. Ecology 81:887–892.CrossRefGoogle Scholar
Woodd, W. R. S., Ward, P., and Clarke, A. 2002. Large-scale patterns in diversity and community structure of surface water copepods from the Atlantic Ocean. Marine Ecology Progress Series 236:189–203.CrossRefGoogle Scholar
Wright, P., Cherns, L., and Hodges, P. 2003. Missing mollusks: field testing taphonomic loss in the Mesozoic through early large-scale aragonite dissolution. Geology 31:211–214.2.0.CO;2>CrossRefGoogle Scholar
Ziegler, A. M., Cocks, L. R. M., and Bambach, R. K. 1968. The composition and structure of Lower Silurian marine communities. Lethaia 1:1–27.CrossRefGoogle Scholar