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Trilobite alpha diversity and the reorganization of Ordovician benthic marine communities

Published online by Cambridge University Press:  08 February 2016

Stephen R. Westrop  and
Jonathan M. Adrain
Stephen R. Westrop
Affiliation:
Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada. E-mail: swestrop@spartan.ac.brocku.ca
Jonathan M. Adrain
Affiliation:
Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom. E-mail: j.adrain@nhm.ac.uk
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Abstract

The Ordovician saw the transformation of marine benthic communities from the trilobite-based Cambrian Fauna to the brachiopod-dominated Paleozoic Fauna. An evaluation of the changing importance of trilobites during the Ordovician can be made from accurate assessments of taxonomic richness in various habitats. Here we present a new compilation of trilobite alpha diversity based on field collections and survey of the literature. The data indicate that trilobite species richness within nearshore, shallow subtidal, carbonate buildup and deep subtidal shelf environments was essentially constant between the Late Cambrian and the Late Ordovician. The alpha diversity patterns do not support the notion that trilobites became displaced from inner shelf environments during the Ordovician. Rather, the data are consistent with a decline in relative importance of the group through dilution as newly radiating invertebrate groups entered Ordovician paleocommunities. They also imply that direct interactions between elements of the Cambrian and Paleozoic faunas were not involved in the Ordovician reorganization of paleocommunities. Like many other major faunal transitions during the Phanerozoic, the Ordovician radiations appear to have been essentially non-competitive in nature.

Type
Articles
Information
Paleobiology , Volume 24 , Issue 1 , Winter 1998 , pp. 1 - 16
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Adrain, J. M., and Fortey, R. A.In press. Ordovician trilobites from the Tourmakeady Limestone, western Ireland. Bulletin of the Natural History Museum, Geology Series.Google Scholar
Aigner, T. 1982. Calcareous tempestites: storm-dominated stratification in the Upper Muschelkalk (Middle Trias, south–west Germany). Pp. 180–190in Einsele, G. and Seilacher, A., eds. Cyclic and event stratification. Springer, Berlin.CrossRefGoogle Scholar
Bambach, R. K. 1977. Species richness in marine benthic habitats through the Phanerozoic. Paleobiology 3:152–167.CrossRefGoogle Scholar
Bambach, R. K. 1983. Ecospace utilization and guilds in marine communities through the Phanerozoic. Pp. 719–746in Tevesz, M. J. S. and McCall, P. M., eds. Biotic interactions in Recent and fossil benthic communities. Plenum, New York.CrossRefGoogle Scholar
Benton, M. 1983. Dinosaur success in the Triassic: a non-competitive ecological model. Quarterly Review of Biology 58:29–51.CrossRefGoogle Scholar
Benton, M. 1987. Progress and competition in macroevolution. Biological Reviews 62:305–338.CrossRefGoogle Scholar
Bretsky, P. W. 1969. Central Appalachian Late Ordovician communities. Geological Society of America Bulletin 80:193–212.CrossRefGoogle Scholar
Brett, K. D., and Westrop, S. R. 1996. Lower Ordovician (Ibexian) trilobites from the Fort Cassin Formation, Champlain Valley region, New York State and Vermont. Journal of Paleontology 70:408–427CrossRefGoogle Scholar
DeMott, L. L. 1987. Platteville and Decorah trilobites from Illinois and Wisconsin. In Sloan, R. E., ed. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the upper Mississippi Valley. Minnesota Geological Survey Report of Investigations 35:63–98.Google Scholar
Droser, M. L., Fortey, R. A., and Li, X. 1996. The Ordovician radiation. American Scientist 84:122–131.Google Scholar
Droser, M. L., and Sheehan, P. M. 1995. Paleoecology of the Ordovician radiation and the Late Ordovician extinction event: evidence from the Great Basin. Pp. 64–106in Cooper, J. D., ed. Ordovician of the Great Basin: fieldtrip guidebook and volume for the Seventh International Symposium on the Ordovician System. SEPM Pacific Section, Fullerton, Calif.Google Scholar
Elias, R. J. 1983. Late Ordovician solitary rugose corals of the Stony Mountain Formation, southern Manitoba, and its equivalents. Journal of Paleontology 57:924–956.Google Scholar
Fortey, R. A., and Morris, S. F. 1982. The Ordovician trilobite Neseuretus from Saudi Arabia, and the palaeogeography of the Neseuretus fauna related to Gondwanaland in the earlier Ordovician. Bulletin of the British Museum of Natural History (Geology) 36:63–75.Google Scholar
Gould, S. J., and Calloway, C. B. 1980. Clams and brachiopods—ships that pass in the night. Paleobiology 6:383–396.CrossRefGoogle Scholar
Hessin, W. A. 1988. Systematics and paleoecology of trilobites from the Cobourg Formation (Upper Ordovician), Southern Ontario, Canada. . Brock University, St. Catharines, Ontario.CrossRefGoogle Scholar
Hintze, L. F. 1973. Lower and Middle Ordovician stratigraphic sections in the Ibex area, Millard County, Utah. Brigham Young University Geology Studies 20:3–36.Google Scholar
Hughes, N. C. 1993. Distribution, taphonomy and functional morphology of the Upper Cambrian trilobite Dikelocephalus. Milwaukee Public Museum Contributions in Biology and Geology 84:1–49. Milwaukee, Wisc.Google Scholar
Hughes, N. C., and Labandeira, C. C.The stability of species in taxonomy. Paleobiology 21:401–403.CrossRefGoogle Scholar
Hurlbert, S. H. 1971. The nonconcept of species diversity: a critique and alternative parameters. Ecology 52:577–586.CrossRefGoogle ScholarPubMed
Ingham, J. K., Curry, G. B., and Williams, A. 1985. Early Ordovician Dounans Limestone fauna, Highland Border Complex, Scotland. Transactions of the Royal Society of Edinburgh, Earth Sciences 76:481–515.CrossRefGoogle Scholar
Ingham, J. K., and Tripp, R. P. 1991. The trilobite fauna of the Doularg Formation of the Girvan district, Scotland, and its palaeoenvironmental significance. Transactions of the Royal Society of Edinburgh, Earth Sciences 82:27–54.CrossRefGoogle Scholar
James, N. P., and Stevens, R. H. 1986. Stratigraphy and correlation of the Cambro-Ordovician Cow Head Group, western Newfoundland. Geological Survey of Canada Bulletin 366.Google Scholar
Kapp, U.S. 1975. Paleoecology of Middle Ordovician stromatoporoid mounds in Vermont. Lethaia 8:195–207.CrossRefGoogle Scholar
Kerr, M., and Eyles, N. 1991. Storm-deposited sandstones (tempestites) and related ichnofossils of the Late Ordovician Georgian Bay Formation, southern Ontario, Canada. Canadian Journal of Earth Sciences 28:266–282.CrossRefGoogle Scholar
LaBarbera, M. 1981. The ecology of Mesozoic Gryphaea, Exogyra and Ilymatogyra (Bivalvia: Mollusca) in a modern ocean. Paleobiology 7:510–526.CrossRefGoogle Scholar
Ludvigsen, R. 1978. Middle Ordovician trilobite biofacies, southern Mackenzie Mountains. In Stelck, C. R. and Chatterton, B. D. E., eds. Western and Arctic Canadian biostratigraphy. Geological Association of Canada Special Paper 18:1–37.Google Scholar
Ludvigsen, R. 1979a. Fossils of Ontario, Part 1. The trilobites. Royal Ontario Museum Life Sciences Miscellaneous Publications. Toronto.Google Scholar
Ludvigsen, R. 1979b. The Ordovician trilobite Pseudogygites Kobayashi in Eastern and Arctic North America. Royal Ontario Museum Life Sciences Contributions 120. Toronto.CrossRefGoogle Scholar
Ludvigsen, R. 1979c. A trilobite zonation of Middle Ordovician rocks, southwestern District of Mackenzie. Geological Survey of Canada Bulletin 312.Google Scholar
Ludvigsen, R. 1982. Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, western District of Mackenzie. Royal Ontario Museum Life Sciences Contributions 134. Toronto.CrossRefGoogle Scholar
Ludvigsen, R., and Tuffnell, P. A. 1994. The last olenacean trilobite: Triarthrus in the Whitby Formation (Upper Ordovician) of southern Ontario. New York State Museum Bulletin 481:183–212.Google Scholar
Ludvigsen, R., and Westrop, S. R. 1983. Trilobite biofacies of the Cambrian–Ordovician boundary interval in northern North America. Alcheringa 7:301–319.CrossRefGoogle Scholar
Ludvigsen, R., Westrop, S. R., and Kindle, C. H. 1989. Sunwaptan (Upper Cambrian) trilobites of the Cow Head Group, western Newfoundland, Canada. Palaeontographica Canadiana 6.Google Scholar
Mikulic, D. G. 1990. The arthropod fossil record: biologic and taphonomic controls on its composition. In Culver, S. J., ed. Arthropod Paleobiology. Short Courses in Paleontology 3:1–23. Paleontological Society, Knoxville, Tenn.Google Scholar
Miller, A. I.In press. Dissecting global diversity patterns: Examples from the Ordovician radiation. Annual Review of Ecology and Systematics.Google Scholar
Miller, A. I., and Mao, S.In press. Scales of diversification and the Ordovician radiation. In McKinney, M. L., ed. Biodiversity dynamics: turnover of populations, taxa and communities. Columbia University Press, New York.Google Scholar
Mitchell, C. E., and Sweet, W. C. 1989. Upper Ordovician conodonts, brachiopods and chronostratigraphy of the Whittaker Formation, southwestern District of Mackenzie, N.W.T., Canada. Canadian Journal of Earth Sciences 26:74–87.CrossRefGoogle Scholar
Palmer, A. R., Cowie, J. W., and Eby, R. G. 1981. A Late Cambrian (Dresbachian, Crepicephalus Zone) fauna from the Boothia Peninsula, District of Franklin. Geological Survey of Canada Bulletin 300:1–6.Google Scholar
Patzkowsky, M. E., and Holland, S. M. 1993. Biotic response to a Middle Ordovician paleoceanographic event in eastern North America. Geology 21:619–622.2.3.CO;2>CrossRefGoogle Scholar
Pratt, B. R. 1992. Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana 9.Google Scholar
Quinlan, G. M., and Beaumont, C. 1984. Appalachian thrusting, lithospheric flexure, and the Paleozoic stratigraphy of the Eastern Interior of North America. Canadian Journal of Sciences 21:973–996.Google Scholar
Read, J. F. 1982. Geometry, facies and development of Middle Ordovician carbonate buildups, Virginia Appalachians. American Association of Petroleum Geologists Bulletin 66:189–209.Google Scholar
Sanders, H. L. 1968. Benthic marine diversity: a comparative study. American Naturalist 102:243–282.CrossRefGoogle Scholar
Sanford, B. V. 1993. St. Lawrence Platform—Geology. Pp. 723–786in Scott, D. F. and Aitken, J. D., eds. Sedimentary cover of the craton in Canada. Geology of Canada 5. Geological Survey of Canada, Ottawa.Google 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. 1982. Flat pebble conglomerates, storm deposits and the Cambrian bottom fauna, Pp. 371–385in Einsele, G. and Seilacher, A., eds. Cyclic and event stratification. Springer, Berlin.CrossRefGoogle Scholar
Sepkoski, J. J. Jr. 1991. A model of onshore-offshore change in faunal diversity. Paleobiology 17:58–77.CrossRefGoogle Scholar
Sepkoski, J. J. Jr. 1996. Competition in macroevolution: the double wedge revisited. Pp. 211–255in Jablonski, D., Erwin, D. H., and Lipps, J. H., eds. Evolutionary paleobiology. University of Chicago Press.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. 153–190in Valentine, J. W., ed. Phanerozoic diversity patterns: profiles in macroevolution. Princeton University Press, Princeton, N.J.Google Scholar
Sepkoski, J. J. Jr., and Sheehan, P. M. 1983. Diversity, faunal change and community replacement during the Ordovician radiations. Pp. 673–717in Tevesz, M. J. S. and McCall, P. M., eds. Biotic interactions in Recent and fossil benthic communities. Plenum, New York.CrossRefGoogle Scholar
Sepkoski, J. J. Jr., Bambach, R. K., Raup, D. M., and Valentine, J. W. 1981. Phanerozoic marine diversity and the fossil record. Nature 293:435–437.CrossRefGoogle Scholar
Signor, P. W., and Brett, C. E. 1984. The mid-Paleozoic precursor to the Mesozoic marine revolution. Paleobiology 10:229–245.CrossRefGoogle Scholar
Sokal, R. R. and Rohlf, F. J. 1981. Biometry. W. H. Freeman, San Francisco.Google Scholar
Statview. 1995. Statview, Version 4.5. Abacus Concepts, Berkeley, Calif.Google Scholar
Stitt, J. H. 1971. Late Cambrian and earliest Ordovician trilobites, Timbered Hills and lower Arbuckle Groups, western Arbuckle Mountains, Murray County, Oklahoma. Oklahoma Geological Survey Bulletin 110.Google Scholar
Stitt, J. H. 1977. Late Cambrian and earliest Ordovician trilobites, Wichita Mountains area, Oklahoma. Oklahoma Geological Survey Bulletin 124.Google Scholar
Thayer, C. W. 1979. Biological bulldozers and the evolution of marine benthic communities. Science 203:458–461.CrossRefGoogle ScholarPubMed
Thomas, A. T. 1979. Trilobite associations in the British Wenlock. In The Calidonides of the British Isles—reviewed. Harris, A. L., Holland, C. H., and Leake, B. E., eds. Geological Society of London Special Paper 8:447–451.CrossRefGoogle Scholar
Thorsteinsson, R. 1958. Cornwallis and Little Cornwallis Islands, District of Franklin, Northwest Territories. Geological Survey of Canada Memoir 294, Ottawa.CrossRefGoogle Scholar
Tremblay, J. V., and Westrop, S. R. 1991. Middle Ordovician trilobites from the Sunblood Formation, District of Mackenzie, Canada. Journal of Paleontology 65:801–823.CrossRefGoogle Scholar
Tripp, R. P. 1979. Trilobites from the Ordovician Auchensoul and Stinchar Limestones of the Girvan District, Strathclyde. Palaeontology 22:339–362Google Scholar
Tripp, R. P., Williams, A., and Paul, C. R. C. 1981. On an exposure of the Ordovician superstes Mudstone at Colmonell, Girvan district, Strathclyde. Scottish Journal of Geology 17:21–25.CrossRefGoogle Scholar
Ulrich, E. O., and Resser, C. E. 1930. The Cambrian of the Upper Mississippi Valley, Part 1: Trilobita, Dikelocephalinae and Osceolinae. Bulletin of the Milwaukee Public Museum, Milwaukee 12:1–122.Google Scholar
Vermeij, G. J. 1977. The Mesozoic marine revolution: evidence from snails, predators and grazers. Paleobiology 33:245–258.CrossRefGoogle Scholar
Westrop, S. R. 1986a. Trilobites of the Upper Cambrian Sunwaptan Stage, southern Canadian Rocky Mountains, Alberta. Palaeontographica Canadiana 3.Google Scholar
Westrop, S. R. 1986b. Taphonomic versus ecologic controls on taxonomic relative abundance patterns in tempestites. Lethaia 19:123–132.CrossRefGoogle Scholar
Westrop, S. R. 1988. Trilobite diversity patterns in an Upper Cambrian stage. Paleobiology 14:401–409.CrossRefGoogle Scholar
Westrop, S. R. 1989. Facies anatomy of an Upper Cambrian grand cycle: Bison Creek and Mistaya formations, southern Alberta. Canadian Journal of Earth Sciences 26:2292–2304.CrossRefGoogle Scholar
Westrop, S. R. 1992. Upper Cambrian (Marjuman–Steptoean) trilobites from the Port-au-Port Group, western Newfoundland. Journal of Paleontology 66:228–255.CrossRefGoogle Scholar
Westrop, S. R. 1995. Sunwaptan (Upper Cambrian) trilobites from the Rabbitkettle Formation, Mackenzie Mountains, Canada. Palaeontographica Canadiana 12.Google Scholar
Westrop, S. R. 1996. Temporal persistence and stability of Cambrian biofacies: Sunwaptan (Upper Cambrian) trilobite faunas of North America. Palaeogeography, Palaeoclimatology, Palaeoecology 127:33–46.CrossRefGoogle Scholar
Westrop, S. R., and Ludvigsen, R. 1983. Systematics and paleoecology of Upper Ordovician trilobites from the Selkirk Member of the Red River Formation, southern Manitoba. Manitoba Department of Energy and Mines, Mineral Resources Division, Geological Report GR 82–2. Winnepeg.Google Scholar
Westrop, S. R., Knox, L. A., and Landing, E. 1993. Lower Ordovician (Ibexian) trilobites from the Tribes Hill Formation, central Mohawk Valley, New York State. Canadian Journal of Earth Sciences 30:1618–1633.CrossRefGoogle Scholar
Westrop, S. R., Tremblay, J. V., and Landing, E. 1995. Declining importance of trilobites in Ordovician nearshore communities: displacement or dilution? Palaios 10:75–79.CrossRefGoogle Scholar
Whittington, H. B. 1963. Middle Ordovician Trilobites from Lower Head, western Newfoundland. Bulletin of the Museum of Comparative Zoology, Harvard University 129:1–118.Google Scholar
Whittington, H. B., and Evitt, W. R. 1954. Silicified Middle Ordovician trilobites. Geological Society of America Memoir 59. Boulder, Colo.CrossRefGoogle Scholar
Wilson, G. D. F. 1987. EXPSPP—a manual, Version 3.1. Distributed by the author.Google Scholar
Young, G. E. 1973. An Ordovician (Arenigian) trilobite faunule of great diversity from the Ibex area, western Utah. Brigham Young University Geology Studies 20:91–116.Google Scholar