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Silurian trilobite alpha diversity and the end-Ordovician mass extinction

  • Jonathan M. Adrain (a1), Stephen R. Westrop (a2), Brian D. E. Chatterton (a3) and Lars Ramsköld (a4)

Abstract

Following the end-Ordovician extinction, global clade diversity of Silurian trilobites dropped to about half of Ordovician levels. Although clade diversity failed to recover, this extinction had surprisingly little long-term impact on the number of trilobite species that occupied local habitats (alpha diversity). A new compilation of data from Laurentia and other continents indicates that Silurian trilobite alpha diversities in all major environments were comparable to those of the Late Cambrian and Ordovician; shallow subtidal diversity reached an all-time high during the Late Ordovician. The profound differences in patterns at local and global levels demonstrate the necessity for a hierarchical approach to analyses of diversity. Factors governing global clade diversity are lodged at hierarchical levels beyond those controlling local species richness and must be sought in studies of between-habitat (beta) or geographic (gamma) diversity.

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Adrain, J. M. 1997. Proetid trilobites from the Silurian (Wenlock-Ludlow) of the Cape Phillips Formation, Canadian Arctic Archipelago. Palaeontographia Italica 84:21111.
Adrain, J. M., and Edgecombe, G. D. 1997. Silurian encrinurine trilobites from the central Canadian Arctic. Palaeontographica Canadiana 14:1109.
Adrain, J. M., Fortey, R. A., and Westrop, S. R. 1998. Post-Cambrian trilobite diversity and evolutionary faunas. Science 280:19221925.
Amsden, T. W. 1968. Articulate brachiopods of the St. Clair Limestone (Silurian), Arkansas, and the Clarita Formation (Silurian), Oklahoma. Paleontological Society Memoir 1:1117.
Bennington, J. B. 1997. RAREFACT. Distributed by the author.
Bergström, J. 1973. Palaeoecologic aspects of an Ordovician Tretaspis fauna. Acta Geologica Polonica 23:179206.
Chatterton, B. D. E., and Campbell, K. S. W. 1980. Silurian trilobites from near Canberra and some related forms from the Yass Basin. Palaeontographica, Abteilung A 167:77119.
Chatterton, B. D. E., and Ludvigsen, R. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River area, District of Mackenzie, Canada. Palaeontographica, Abteilung A 154:1106.
Chlupáč, I. 1987. Ecostratigraphy of Silurian trilobite assemblages of the Barrandian area, Czechoslovakia. Newsletters on Stratigraphy 17:169186.
Chugaeva, M. N. 1975. Late Ordovician trilobites of the northeast of the USSR. Trudy Ordena Trudavago Krasnago Znameni Geologicheskij Institut 272:176. [In Russian.]
Cisne, J. L. 1973. Beecher's trilobite bed revisited: ecology of an Ordovician deepwater fauna. Postilla 160:125.
Cocks, L. R. M., and Fortey, R. A. 1988. Lower Paleozoic facies and faunas around Gondwana. In Audley-Charles, M. G. and Hallam, A., eds. Gondwana and Tethys. Geological Society Special Publication 37:183200. Geological Society of London.
Dean, W. T. 1971a. Ordovician trilobites from the central volcanic mobile belt at New World Island, Newfoundland. Geological Survey of Canada Bulletin 210:136.
Dean, W. T. 1971b. The trilobites of the Chair of Kildare Limestone (upper Ordovician) of eastern Ireland, Part 1. Monographs of the Palaeontographical Society 531:160.
Dean, W. T. 1974. The trilobites of the Chair of Kildare Limestone (upper Ordovician) of eastern Ireland, Part 2. Monographs of the Palaeontographical Society 539:6198.
Dean, W. T. 1978 (for 1977). The trilobites of the Chair of Kildare Limestone (upper Ordovician) of eastern Ireland, Part 3. Monographs of the Palaeontographical Society 550:99129.
Dean, W. T., and Zhou, Z.-Y. 1988. Upper Ordovician trilobites from the Zap Valley, south-east Turkey. Palaeontology 31:621649.
Desbiens, S., and Lespérance, P. J. 1989. Stratigraphy of the Ordovician of the Lac Saint-Jean and Chicoutimi outliers, Quebec. Canadian Journal of Earth Sciences 26:11851202.
Eldredge, N. 1996. Hierarchies in macroevolution. Pp. 4261in Jablonski, D., Erwin, D. H., and Lipps, J. H., eds. Evolutionary paleobiology. University of Chicago Press, Chicago.
Fortey, R. A., and Droser, M. L. 1996. Trilobites at the base of the Middle Ordovician, western United States. Journal of Paleontology 70:7399.
Hammann, W. 1976. Trilobiten aus dem oberen Caradoc der östlichen Sierra Morena (Spanien). Senckenbergiana Lethaea 57:3585.
Hammann, W. 1992. The Ordovician trilobites from the Iberian Chains in the province of Aragón, NE-Spain. I. The trilobites of the Cystoid Limestone (Ashgill Series). Beringeria 6:3219.
Harper, D. A. T., and Owen, A. W. 1984. The Caradoc brachiopod and trilobite fauna of the upper Kirkerud Group, Hadeland, Norway. Geologica et Palaeontologica 18:2151.
Harper, D. A. T., and Owen, A. W. 1986. A shelly biofacies from the graptolitic mudstones of the Lower Balclatchie Group (lower Caradoc) near Laggan, Girvan district. Scottish Journal of Geology 22:271283.
Harper, D. A. T., Owen, A. W., and Williams, S. H. 1984. The Middle Ordovician of the Oslo Region, Norway, 34. The type Nakholmen Formation (upper Caradoc), Oslo, and its faunal significance. Norsk Geologisk Tidsskrift 64:293312.
Helbert, G. J. 1985. Silurian trilobites from Scandinavia. . University of Keele, Keele, England.
Holloway, D. J., and Sandford, A. 1993. An Early Silurian trilobite fauna from Tasmania. Memoirs of the Association of Australasian Palaeontologists 15:85102.
Howells, Y. 1979. Scottish Silurian trilobites. . University of Keele, Keele, England.
Hughes, C. P., Rickards, R. B., and Williams, A. 1980. The Ordovician fauna from the Contaya Formation of eastern Peru. Geological Magazine 117:121.
Ingham, J. K., and Tripp, R. P. 1991. The trilobite fauna of the Middle Ordovician Doularg Formation of the Girvan district, Scotland, and its palaeoenvironmental significance. Transactions of the Royal Society of Edinburgh (Earth Sciences) 82:2754.
Jablonski, D. 1998. Geographic variation in molluscan recovery from the end-Cretaceous extinction. Science 279:13271330.
Lane, P. D. 1972. New trilobites from the Silurian of north-east Greenland, with a note on trilobite faunas in pure limestones. Palaeontology 15:336364.
Lane, P. D. 1979. Llandovery trilobites from Washington Land, North Greenland. Grønlands Geologisk Undersøgelse Bulletin 131:137.
Lane, P. D. 1988. Silurian trilobites from Peary Land, central North Greenland. Grønlands Geologiske Undersøgelse Rapport 137:93117.
Lane, P. D., and Owens, R. M. 1982. Silurian trilobites from Kap Schuchert, Washington Land, western North Greenland. Grønlands Geologiske Undersøgelse Rapport 108:4169.
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 14:215233.
Ludvigsen, R. 1978. Middle Ordovician trilobite biofacies, southern Mackenzie Mountains. Pp. 137in Stelck, C. R. and Chatterton, B. D. E., eds. Western and Arctic Canadian biostratigraphy. Geological Association of Canada Special Paper 18.
Ludvigsen, R. 1980. An unusual trilobite faunule from Llandeilo or lowest Caradoc strata (Middle Ordovician) of northern Yukon Territory. Geological Survey of Canada Paper 80;c-1B:97106.
Ludvigsen, R., and Tripp, R. P. 1990. Silurian trilobites from the northern Yukon Territory. Royal Ontario Museum Life Sciences Contributions 153:159.
Ludvigsen, R., and Westrop, S. R. 1983. Trilobite biofacies of the Cambrian-Ordovician boundary interval in northern North America. Alcheringa 7:301319.
MacGregor, A. R. 1962. Upper Llandeilo trilobites from the Berwyn Hills, North Wales. Palaeontology 5:790816.
McNamara, K. J. 1979. The age, stratigraphy and genesis of the Coniston Limestone Group in the southern Lake District. Geological Journal 14:4168.
Mikulic, D. G. 1979. The paleoecology of Silurian trilobites with a section on the Silurian stratigraphy of southeastern Wisconsin. . Oregon State University, Corvallis.
Mikulic, D. G., and Watkins, R. 1981. Trilobite ecology in the Ludlow Series of the Welsh Borderland. Pp. 101116in Gray, J., Boucot, A. J., and Berry, W. B. N., eds. Communities of the past. Hutchinson Ross, Stroudsburg, Penn.
Miller, A. I. 1997. Comparative diversification dynamics among paleocontinents during the Ordovician Radiation. Geobios Mémoire Spécial 20:397406.
Miller, A. I., Holland, S. M., Droser, M. L., and Patzkowsky, M. E. 1998. Dynamics of the Ordovician Radiation: a comment on Westrop and Adrain. Paleobiology 24:524528.
Nan, R. 1985. Upper Ordovician trilobites from the Wulongtun Formation of eastern Yilehuli Shan Heilo Ngjiang Province. Bulletin of the Shenyang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences 12:5667. [In Chinese with English summary.]
Nielsen, A. T. 1995. Trilobite systematics, biostratigraphy and palaeoecology of the Lower Ordovician Komstad Limestone and Huk Formations, southern Scandinavia. Fossils and Strata 38:1374.
O'Neill, R. V., DeAngelis, D. L., Waide, J. B., and Allen, T. F. H. 1986. A hierarchical concept of ecosystems. Monographs in Population Biology No. 23.
Owen, A. W. 1981. The Ashgill trilobites of the Oslo region, Norway. Palaeontographica, Abteilung A 175:188.
Owen, A. W. 1986. The uppermost Ordovician (Hirnantian) trilobites of Girvan, SW Scotland with a review of coeval trilobite faunas. Transactions of the Royal Society of Edinburgh (Earth Sciences) 77:231239.
Owen, A. W., and Clarkson, E. N. K. 1992. Trilobites from Kilbucho and Wallace's Cast and the location of the Northern Belt of the Southern Uplands during the late Ordovician. Scottish Journal of Geology 28:317.
Owen, A. W., and Harper, D. A. T. 1982. The Middle Ordovician of the Oslo Region, Norway, 31. The upper Caradoc trilobites and brachiopods from Vestbråten, Ringerike. Norsk Geologisk Tidsskrift 62:95120.
Owen, A. W., Tripp, R. P., and Morris, S. F. 1986. The trilobite fauna of the Raheen Formation (upper Caradoc), Co. Waterford, Ireland. Bulletin of the British Museum (Natural History) Geology 40:91122.
Perry, D. G., and Chatterton, B. D. E. 1979. Wenlock trilobites and brachiopods from the Mackenzie Mountains, north-western Canada. Palaeontology 22:569607.
Pollock, S. G., Harper, D. A. T., and Rohr, D. 1994. Late Ordovician nearshore faunas and depositional environments, northwestern Maine. Journal of Paleontology 68:925937.
Price, D., and Magor, P. M. 1984. The ecological significance of variation in the generic composition of Rawtheyan (late Ordovician) trilobite faunas from North Wales, U. K. Geological Journal 19:187200.
Ramsköld, L. 1985. Studies on Silurian trilobites from Gotland, Sweden. . University of Stockholm, Stockholm.
Ramsköld, L. 1994. A Middle Llandovery shelly fauna from Motala in Östergötland, south central Sweden. 1. Trilobita. Paläontologische Zeitschrift 68:377395.
Romano, M., and Owen, A. W. 1993. Early Caradoc trilobites of eastern Ireland and their palaeogeographical significance. Palaeontology 36:681720.
Rushton, A. W. A. 1982. The biostratigraphy and correlation of the Merioneth-Tremadoc Series boundary in North Wales. In Bassett, M. G. and Dean, W. T., eds. The Cambrian-Ordovician boundary: sections, fossil distributions and correlations. Geological Series, National Museum of Wales 3:4159.
Rushton, A. W. A., and Hughes, C. P. 1981. The Ordovician trilobite fauna of the Great Paxton Borehole, Cambridgeshire. Geological Magazine 118:623646.
Shaw, F. C. 1980. Shallow-water lithofacies and trilobite biofacies of the Mingan Formation (Ordovician), eastern Quebec. Naturaliste Canadien 107:227242.
Siveter, D. J. 1989. Silurian trilobites from the Annascaul Inlier, Dingle Peninsula, Ireland. Palaeontology 32:109161.
Šnajdr, M. 1978. The Llandoverian trilobites from Hyskov (Barrandian area). Sborník Geologických Ved, (Paleontologie) 21:747.
Statview. 1995. Statview, Version 4.5. Abacus Concepts, Berkeley, Calif.
Thomas, A. T. 1979. Trilobite associations in the British Wenlock. In Harris, A. L., Holland, C. H., and Leake, B. E., eds. The Caledonides of the British Isles: reviewed. Geological Society Special Publication 8:447451. Geological Society of London.(??)
Tomczykowa, E. 1957. Trylobity z lupkow graptolitowych wenloku i dolnego ludlowu Gór Swietokrzyskich. Biuletyn Instytutu Geologicznego 122:83143.
Tripp, R. P. 1962. Trilobites from the “confinis” Flags (Ordovician) of the Girvan district, Ayrshire. Transactions of the Royal Society of Edinburgh, 65:140.
Tripp, R. P. 1965. Trilobites from the Albany Division (Ordovician) of the Girvan district, Ayrshire. Palaeontology 8:577603.
Tripp, R. P. 1976. Ordovician trilobites from the basal superstes Mudstones (Ordovician) at Aldons Quarry, near Girvan, Ayrshire. Transactions of the Royal Society of Edinburgh 69:369423.
Tripp, R. P. 1980a. Trilobites from the Ordovician Balclatchie and lower Ardwell groups of the Girvan district, Scotland. Transactions of the Royal Society of Edinburgh (Earth Sciences) 71:123145.
Tripp, R. P. 1980b. Trilobites from the Ordovician Ardwell Group of the Craighead Inlier, Girvan district, Scotland. Transactions of the Royal Society of Edinburgh (Earth Sciences) 71:147157.
Tripp, R. P., Williams, A., and Paul, C. R. C. 1981. On an exposure of the Ordovician superstes Mudstones at Colmonell, Girvan District, Strathclyde. Scottish Journal of Geology 17:2125.
Tripp, R. P., Zhou, Z.-Y., and Pan, Z. 1989. Trilobites from the Upper Ordovician Tangtou Formation, Jiangsu Province, China. Transactions of the Royal Society of Edinburgh (Earth Sciences) 80:2568.
Valentine, J. W. 1973. Evolutionary paleoecology of the marine biosphere. Prentice-Hall, Englewood Cliffs, N.J.
Vaněek, J., and Vokáě, V. 1997. Trilobites of the Bohdalec Formation (Upper Berounian, Ordovician, Prague Basin, Czech Republic). Palaeontologia Bohemiae 3:2050.
Wandås, B. T. G. 1984 (for 1983). The Middle Ordovician of the Oslo Region, Norway. 33. Trilobites from the lowermost part of the Ogygiocaris Series. Norsk Geologisk Tidsskrift 63:211267.
Wang, Q.-Z. 1989. Early Silurian trilobites from Wulong, southeastern Sichuan (China). Journal of Hebei College of Geology 12:422440. [In Chinese with English summary.]
Watkins, R. 1993. The Silurian (Wenlockian) reef fauna of southeastern Wisconsin. Palaios 8:325338.
Westrop, S. R., and Adrain, J. M. 1998a. Trilobite alpha diversity and the reorganization of Ordovician benthic marine communities. Paleobiology 24:116.
Westrop, S. R., and Adrain, J. M. 1998b. Trilobite diversity and the Ordovician Radiation: a reply to Miller et al. Paleobiology 24:529533.
Westrop, S. R., and Rudkin, D. M. 1999. Trilobite taphonomy of a Silurian reef: Attawapiskat Formation, northern Ontario. Palaios 14:389397.
Westrop, S. R., Tremblay, J. V., and Landing, E. 1995. Declining importance of trilobites in Ordovician nearshore paleocommunities: dilution or displacement? Palaios 10:7579.
Whittard, W. F. 1967. The Ordovician trilobites of the Shelve Inlier, west Shropshire, Part 9. Monographs of the Palaeontographical Society 516:307352.
Whittard, W. F. 1979. An account of the Ordovician rocks of the Shelve Inlier in west Salop and part of north Powys. Bulletin of the British Museum (Natural History) Geology 33:169.
Whittington, H. B., and Campbell, K. S. W. 1967. Silicified Silurian trilobites from Maine. Bulletin of the Museum of Comparative Zoology, Harvard University 135:447483.
Whittington, H. B., and Hughes, C. P. 1972. Ordovician geography and faunal provinces deduced from trilobite distribution. Philosophical Transactions of the Royal Society of London B 263:235278.
Zhou, Z.-Y., and Dean, W. T. 1986. Ordovician trilobites from Chedao, Gansu Province, north-west China. Palaeontology 29:743786.
Zhou, Z.-Y., and Fortey, R. A. 1986. Ordovician trilobites from north and northeastern China. Palaeontographica, Abteilung A 192:157210.
Zhou, Z.-Y., Yin, G.-Z., and Tripp, R. P. 1984. Trilobites from the Ordovician Shihtzupu Formation, Zunyi, Guizhou Province, China. Transactions of the Royal Society of Edinburgh (Earth Sciences) 75:1336.
Zhou, Z.-Y., Webby, B. D., and Yuan, W. 1995. Ordovician trilobites from the Yingan Formation of northwestern Tarim, Xinjiang, northwestern China. Alcheringa 19:4772.
Zhou, Z.-Y., Dean, W. T., Yuan, W., and Zhou, T.-R. 1998. Ordovician trilobites from the Dawangou Formation, Kalpin, Xinjiang, north-west China. Palaeontology 41:693735.

Silurian trilobite alpha diversity and the end-Ordovician mass extinction

  • Jonathan M. Adrain (a1), Stephen R. Westrop (a2), Brian D. E. Chatterton (a3) and Lars Ramsköld (a4)

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