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Macroecological responses of terrestrial vegetation to climatic and atmospheric change across the Triassic/Jurassic boundary in East Greenland

  • Jennifer C. McElwain (a1), Mihai E. Popa (a2), Stephen P. Hesselbo (a3), Matthew Haworth (a4) and Finn Surlyk (a5)...


The magnitude and pace of terrestrial plant extinction and macroecological change associated with the Triassic/Jurassic (Tr/J) mass extinction boundary have not been quantified using paleoecological data. However, tracking the diversity and ecology of primary producers provides an ideal surrogate with which to explore patterns of ecosystem stability, collapse, and recovery and to explicitly test for gradual versus catastrophic causal mechanisms of extinction.

We present an analysis of the vegetation dynamics in the Jameson Land Basin, East Greenland, spanning the Tr/J extinction event, from a census collected paleoecological data set of 4303 fossil leaf specimens, in an attempt to better constrain our understanding of the causes and consequences of the fourth greatest extinction event in earth history. Our analyses reveal (1) regional turnover of ecological dominants between Triassic and Jurassic plant communities, (2) marked structural changes in the vegetation as reflected by potential loss of a mid-canopy habit, and (3) decline in generic-level richness and evenness and change in ecological composition prior to the Tr/J boundary; all of these findings argue against a single catastrophic causal mechanism, such as a meteorite impact for Tr/J extinctions. We identify various key ecological and biological traits that increased extinction risk at the Tr/J boundary and corroborate predictions of meta-population theory or plant ecophysiological models. These include ecological rarity, complex reproductive biology, and large leaf size.

Recovery in terms of generic-level richness was quite rapid following Tr/J extinctions; however, species-level turnover in earliest Jurassic plant communities remained an order of magnitude higher than observed for the Triassic. We hypothesize, on the basis of evidence for geographically extensive macrofossil and palynological turnover across the entire Jameson Land Basin, that the nature and magnitude of paleoecological changes recorded in this study reflect wider vegetation change across the whole region. How exactly these changes in dominance patterns of plant primary production affected the entire ecosystem remains an important avenue of future research.



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Archangelsky, A., Andreis, R. R., Archangelsky, S., and Artabe, A. 1995. Cuticular characters adapted to volcanic stress in a new Cretaceous cycad leaf from Patagonia, Argentina: considerations on the stratigraphy and depositional history of the Baquero Formation. Review of Palaeobotany and Palynology 89: 213233.
Ash, S. 1986. Fossil plants and the Triassic-Jurassic boundary. Pp. 2130 in Padian, K., ed. The beginning of the age of dinosaurs. Cambridge University Press, Cambridge.
Axsmith, B. J., Krings, M., and Waselkov, K. 2004. Conifer pollen cones from the Cretaceous of Arkansas: implications for diversity and reproduction in the Cheirolepidaceae. Journal of Paleontology 78: 402409.
Bambach, R. K., Knoll, A. H., and Wang, S. C. 2004. Origination, extinction, and mass depletions of marine diversity. Paleobiology 30: 522542.
Beerling, D. J., and Berner, R. A. 2002. Biogeochemical constraints on the Triassic-Jurassic boundary carbon cycle event. Global Biogeochemical Cycles 16.
Behrensmeyer, A. K., Kidwell, S. M., and Gastaldo, R. A. 2000. Taphonomy and paleobiology. In Erwin, D. H. and Wing, S. L., eds. Deep time: Paleobiology's perspective. Paleobiology 26(Suppl. to No. 4): 103148.
Burnham, R. J. 1989. Relationships between standing vegetation and leaf litter in a paratropical forest: implications for paleobotany. Review of Palaeobotany and Palynology 58: 532.
Burnham, R. J. 1993. Reconstructing richness in the plant fossil record. Palaios 8: 376384.
Burnham, R. J., Wing, S. L., and Parker, G. G. 1992. The reflection of deciduous forest communities in leaf litter: implications for autochthonous litter assemblages from the fossil record. Paleobiology 18: 3049.
Cantor, B. M., Aigler, B. V., Pace, D. W., Reid, S. B., Thomson, C. Y., and Gastaldo, R. A. 2006. Intra- and interspecific variation in stomatal proxies for Quercus and Nyssa in the subtropical southeastern USA. Geological Society of America Abstracts with Programs 38: 487.
Carter, E. S., and Hori, R. S. 2005. Global correlation of the radiolarian faunal change across the Triassic-Jurassic boundary. Canadian Journal of Earth Sciences 42: 777790.
Crane, P. R. 1985. Phylogenetic analysis of seed plants and the origin of angiosperms. Annals of the Missouri Botanical Garden 72: 716793.
Crepet, L. 1974. Investigations of North American cycadeoids: the reproductive biology of Cycadeoidea. Palaeontographica, Abteilung B 148: 144169.
Dam, G., and Surlyk, F. 1993a. Cyclic sedimentation in a large wave- and storm-dominated anoxic lake, Kap Stewart Formation (Rhaetian-Sinemurian), Jameson Land, East Greenland. International Association of Sedimentologists Special Publication 18: 419448.
Dam, G., and Surlyk, F. 1993b. Forced regressions in a large wave- and storm dominated anoxic lake; Kap Stewart Formation East Greenland. Geology 20: 748751.
Delevoryas, T. 1963. Investigations of North American cycadeoids: cones of Cycadeoidea. American Journal of Botany 50: 4552.
DiMichele, W. A., Pfefferkorn, H., and Phillips, T. L. 1996. Persistence of Late Carboniferous tropical vegetation during glacially driven climatic and sea-level fluctuations. Palaeogeography, Palaeoclimatology, Palaeoecology 125: 105128.
Donaldson, J. S. 1997. Is there a floral parasite mutualism in cycad pollination? The pollination biology of Encpharlatos villosus (Zamiaceae). American Journal of Botany 84: 13981406.
Droser, M. L., Bottjer, D. J., and Sheehan, P. M. 1997. Evaluating the ecological architecture of major events in the Phanerozoic history of marine invertebrate life. Geology 25: 167170.
Droser, M. L., Bottjer, D. J., Sheehan, P. M., and McGhee, G. R. 2000. Decoupling of taxonomic and ecologic severity of Phanerozoic marine mass extinctions. Geology 28: 675678.
Ferguson, D. K. 1985. The origin of leaf assemblages—new light on an old problem. Review of Palaeobotany and Palynology 46: 117188.
Foote, M. 2000. Origination and extinction components of taxonomic diversity: general problems. In Erwin, D. H. and Wing, S. L., eds. Deep time: Paleobiology's perspective. Paleobiology 26(Suppl. to No. 4): 74102.
Fowell, S. J., and Olsen, P. E. 1993. Time calibration of Triassic-Jurassic microfloral turnover, Eastern North America. Tectonophysics 222: 361369.
Galli, M. T., Jadoul, F., Bernasconi, S. M., Cirilli, S., and Weissert, H. 2006. Stratigraphy and paleoenvironmental analysis of the Triassic-Jurassic boundary interval in the Zleichov Basin, Western Carpathians. Palaeogeography, Palaeoclimatology, Palaeoecology 244: 5271.
Galli, M. T., Jadoul, F., Bernasconi, S. M., and Weissert, H. 2005. Anomalies in global carbon cycling and extinction at the Triassic/Jurassic boundary: evidence from a marine C-isotope record. Palaeogeography, Palaeoclimatology, Palaeoecology 216: 203214.
Gastaldo, R. A. 1989. Preliminary observations on phytotaphonomic assemblages in a subtropical/temperate Holocene bay-head delta: Mobile Delta, Gulf Coastal Plain, Alabama. Review of Palaeobotany and Palynology 58: 6183.
Gastaldo, R. A. 2001. Plant taphonomy. Pp. 314317 in Briggs, D. E. G. and Crowther, P. R., eds. Paleobiology II. Blackwell Science, Oxford.
Gaston, K. J. 1994. Rarity. Chapman and Hall, London.
Gauslaa, Y. 1984. A comparison between heat resistance and heat exchange capacity in different vascular plants. Holarctic Ecology 7: 6470.
Guex, J., Bartolini, A., Atudorei, V., and Taylor, D. 2004. High-resolution ammonite and carbon isotope stratigraphy across the Triassic-Jurassic boundary at New York Canyon (Nevada). Earth and Planetary Science Letters 225: 2941.
Hallam, A. 1997. Estimates for the amount and rate of sea level change across the Rhaetic-Hettangian and Pliensbachian-Toarcian boundaries (latest Triassic to Early Jurassic). Journal of the Geological Society, London 154: 773779.
Hallam, A. 2002. How catastrophic was the end-Triassic mass extinction? Lethaia 35: 147157.
Hammer, O., Harper, D. A. T., and Ryan, P. D. 2001. PAST: paleontological statistics software package for education and data analysis, Version 1. 33. Available online at
Harris, T. M. 1926. The Rhaetic flora of Scoresby Sound, East Greenland. Meddelelser om Grønland 68: 143.
Harris, T. M. 1931. The fossil flora of Scoresby Sound, East Greenland, Part 1. Cryptogams. Meddelelser om Grønland 85: 1102.
Harris, T. M. 1932a. The fossil flora of Scoresby Sound, East Greenland, Part 2. Seed plants incertae sedis. Meddelelser om Grønland 85(3): 1112.
Harris, T. M. 1932b. The fossil flora of Scoresby Sound, East Greenland, Part 3. Caytoniales and Bennettitales. Meddelelser om Grønland 85(5): 1133.
Harris, T. M. 1935. The fossil flora of Scoresby Sound, East Greenland, Part 4. Ginkgoales, Lycopodiales and isolated fructifications. Meddelelser om Grønland 112(1): 1121.
Harris, T. M. 1937. The fossil flora of Scoresby Sound East Greenland, Part 5. Stratigraphic relations of the plant beds. Meddelelser om Grønland 112(2): 1112.
Harris, T. M. 1974. Williamsoniella lignieri: its pollen and the compression of spherical pollen grains. Palaeontology 17: 125148.
Hay, W. W., and DeConto, R. M. 1999. Comparison of modern and Late Cretaceous meridonal energy transport and oceanology. In Barrera, E. and Johnson, C. C., eds. Evolution of the Cretaceous ocean-climate system. Geological Society of America Special Paper 332: 283300.
Hesselbo, S. P., Robinson, S. A., Surlyk, F., and Piasecki, S. 2002. Terrestrial and marine extinction at the Triassic-Jurassic boundary synchronized with major carbon-cycle perturbation: a link to initiation of massive volcanism? Geology 30: 251254.
Hesselbo, S. P., Robinson, S. A., and Surlyk, F. 2004. Sea-level change and facies development across potential Triassic-Jurassic boundary horizons, SW Britain. Journal of the Geological Society 161: 365379.
Hill, M. O., and Gauch, H. G. J. 1980. Detrended correspondence analysis: an improved ordination technique. Vegetatio 42: 4758.
Hodych, J. P., and Dunning, G. R. 1992. Did the Manicouagan impact trigger end-of-Triassic mass extinction? Geology 20: 5154.
Howe, J., and Cantrill, D. J. 2001. Palaeoecology and taxonomy of Pentoxylales from the Albian of Antarctica. Cretaceous Research 22: 779793.
Hubbard, R., and Boulter, M. C. 2000. Phytogeography and paleoecology in Western Europe and eastern Greenland near the Triassic-Jurassic boundary. Palaios 15: 120131.
Huynh, T. T., and Poulsen, C. J. 2005. Rising atmospheric CO2 as a possible trigger for the end-Triassic mass extinction. Palaeogeography, Palaeoclimatology, Palaeoecology 217: 223242.
Kerp, H., Abu Hamad, A., Vording, B., and Bandel, K. 2006. Typical Triassic Gondwanan floral elements in the Upper Permian of the paleotropics. Geology 34: 265268.
Kiessling, W. 2001. Paleoclimatic significance of Phanerozoic reefs. Geology 29: 751754.
Kiessling, W. 2005. Long-term relationships between ecological stability and biodiversity in Phanerozoic reefs. Nature 433: 410413.
Kimura, T., and Sekido, S. 1975. Nilssoniocladus n. gen. (Nilssoniaceae n. fam.) newly found from the Early Lower Cretaceous of Japan. Palaeontographica 153: 111118.
Klavins, S. D., Taylor, E. L., Krings, M., and Taylor, T. N. 2003. Gymnosperms from the middle Triassic of Antarctica: the first structurally preserved cycad pollen cone. International Journal of Plant Sciences 164: 10071020.
Klavins, S. D., Kellogg, D. W., Krings, M., Taylor, E. L., and Taylor, T. N. 2005. Coprolites in a Middle Triassic cycad pollen cone: evidence for insect pollination in early cycads? Evolutionary Ecology Research 7: 479488.
Knight, K. B., Nomade, S., Renne, P. R., Marzoli, A., Bertrand, H., and Youbi, N. 2004. The central Atlantic magmatic province at the Triassic-Jurassic boundary: paleomagnetic and Ar-40/Ar-39 evidence from Morocco for brief, episodic volcanism. Earth and Planetary Science Letters 228: 143160.
Koppelhus, E. B. 1997. Palynology of the lacustrine Kap Stewart Formation, Jameson Land, East Greenland. Danmark og Grønlands Geologiske Undersøgelse Rapport 1996/30, Appendix 5.
Krings, M., Kerp, H., Taylor, T. N., and Taylor, E. L. 2003. How Paleozoic vines and lianas got off the ground: on scrambling and climbing Carboniferous-early Permian pteridosperms. Botanical Review 69: 204224.
Larcher, W. 1994. Photosynthesis as a tool for indicating temperature stress events. P. 513 in Schulze, E.-D. and Caldwell, M. M., eds. Ecophysiology of photosynthesis. Ecological Studies, Vol. 10. Springer, New York.
Lawton, J. H., Daily, G., and Newton, I. 1994. Population-dynamic principles. Philosophical Transactions of the Royal Society of London B 344: 6168.
Loreau, M., Naeem, S., Inchausti, P., Bengtsson, J., Grime, J. P., Hector, A., Hooper, D. U., Huston, M. A., Raffaelli, D., Schmid, B., Tilman, D., and Wardle, D. A. 2001. Ecology—biodiversity and ecosystem functioning: current knowledge and future challenges. Science 294: 804808.
Loreau, M., Mouquet, N., and Gonzalez, A. 2003. Biodiversity as spatial insurance in heterogeneous landscapes. Proceedings of the National Academy of Sciences USA 100: 1276512770.
Marzoli, A., Renne, P. R., Piccirillo, E. M., Ernesto, M., Bellieni, G., and De Min, A. 1999. Extensive 200-million-year-old continental flood basalts of the Central Atlantic Magmatic Province. Science 284: 616618.
Marzoli, A., Bertrand, H., Knight, K. B., Cirilli, S., Buratti, N., Verati, C., Nomade, S., Renne, P. R., Youbi, N., Martini, R., Allenbach, K., Neuwerth, R., Rapaille, C., Zaninetti, L., and Bellieni, G. 2004. Synchrony of the Central Atlantic Magmatic Province and the Triassic-Jurassic boundary climatic and biotic crisis. Geology 32: 973976.
McElwain, J. C., Beerling, D. J., and Woodward, F. I. 1999. Fossil plants and global warming at the Triassic-Jurassic boundary. Science 285: 13861390.
McElwain, J. C., Wade-Murphy, J., and Hesselbo, S. P. 2005. Changes in carbon dioxide during an oceanic anoxic event linked to intrusion into Gondwana coals. Nature 435: 479482.
McKinney, M. L. 1997. Extinction vulnerability and selectivity: combining ecological and paleontological views. Annual Review of Ecology and Systematics 28: 495516.
McRoberts, C. A., and Newton, C. R. 1995. Selective extinction among end-Triassic European bivalves. Geology 23: 102104.
Mossman, D. J., Grantham, R. G., and Langenhorst, F. 1998. A search for shocked quarts at the Triassic-Jurassic boundary in the Fundy and Newark basins of the Newark supergroup. Canadian Journal of Earth Sciences 35: 101109.
Mound, L. A., and Terry, I. 2001. Thrips pollination of the central Australian cycad, Macrozamia macdonnellii (Cycadales). International Journal of Plant Sciences 162: 147154.
Newell, N. D. 1963. Crises in the history of life. Scientific American 208: 7692.
Oberprieler, R. G. 1995a. The weevils (Coleoptera: Curculionidae) associated with cycads. 1. Classification, relationships, and biology. Pp. 295334 in Vorster, P., ed. Proceedings of the third international conference on cycad biology, Pretoria, 1993. Cycad Society of South Africa, Stellenbosch.
Oberprieler, R. G. 1995b. The weevils (Coleoptera: Curculionidae) associated with cycads. 2. Host specificity and implications for cycad taxonomy. Pp. 335365 in Vorster, P., ed. Proceedings of the third international conference on cycad biology, Pretoria, 1993. Cycad Society of South Africa, Stellenbosch.
Olsen, P. E., Shubin, N. H., and Anders, M. H. 1987. New Early Jurassic tetrapod assemblages constrain Triassic-Jurassic tetrapod extinction event. Science 237: 10251029.
Olsen, P. E., Kent, D. V., Sues, H. D., Koeberl, C., Huber, H., Montanari, A., Rainforth, E. C., Fowell, S. J., Szajna, M. J., and Hartline, B. W. 2002. Ascent of dinosaurs linked to an iridium anomaly at the Triassic-Jurassic boundary. Science 296: 13051307.
Palfy, J., Smith, P. L., and Mortensen, J. K. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences 37: 923944.
Palfy, J., Demeny, A., Haas, J., Hetenyi, M., Orchard, M. J., and Veto, I. 2001. Carbon isotope anomaly and other geochemical changes at the Triassic-Jurassic boundary from a marine section in Hungary. Geology 29: 10471050.
Parolin, P. 2001. Seed masses in Amazonian floodplains forests with contrasting nutrient supplies. Journal of Tropical Ecology 16: 417428.
Pedersen, K. R., and Lund, J. J. 1980. Palynology of the plant-bearing Rhaetian to Hettangian Kap Stewart Formation, Scoresby Sund, East Greenland. Review of Palaeobotany and Palynology 31: 169.
Peters, S. E. 2004. Evenness of Cambrian-Ordovician benthic marine communities in North America. Paleobiology 30: 325346.
Pfefferkorn, H. W., Mustafa, H., and Hass, H. 1975. Quantitative Charakteriseirung ober-karboner Abdruckfloren. Neues Jahrbuch für Geologie und Paläontologie 150: 253269.
Popa, M. E. 2000. Early Jurassic land flora of the Getic Nappe. . University of Bucharest, Bucharest.
Rees, P. M., Ziegler, A. M., and Valdes, P. J. 2000. Jurassic phytogeography and climates: new data and model comparisons. Pp. 297318 in Huber, B. T., MacLeod, K. G., and Wing, S. L., eds. Warm climates in earth history. Cambridge University Press, Cambridge.
Sepkoski, J. J. Jr. 1981. A factor analytic description of the Phanerozoic marine fossil record. Paleobiology 7: 3653.
Sepkoski, J. J. Jr. 1993. 10 years in the library: new data confirm paleontological patterns. Paleobiology 19: 4351.
Signor, P. W. III, and Lipps, J. H. 1982. Sampling bias, gradual extinction patterns and catastrophes in the fossil record. In Silver, L. T. and Shultz, P. H., eds. Geological implications of impacts of large asteroids and comets on the earth. Geological Society of America Special Paper 190: 291296.
Spicer, R. A. 1989. The formation and interpretation of plant fossil assemblages. Advances in Botanical Research Incorporating Advances in Plant Pathology 16: 95191.
Spicer, R. A., and Herman, A. B. 1996. Nilssoniocladus in the Cretaceous Arctic: new species and biological insights. Review of Palaeobotany and Palynology 92: 229243.
Steart, D. C., Greenwood, D. R., and Boon, P. I. 2005. Paleoecological implications of differential biomass and litter production in canopy trees in Australian Nothofagus and Eucalyptus forests. Palaios 20: 452462.
Surlyk, F. 2003. The Jurassic of East Greenland: a sedimentary record of thermal subsidence, onset and culmination of rifting. Pp. 659723 in Ineson, J. R. and Surlyk, F., eds. The Jurassic of Denmark and Greenland. Geological Survey of Denmark and Greenland, Copenhagen.
Sykes, R. M. 1974. Sedimentological studies in southern Jameson Land, East Greenland. I. Fluviatile sequences in the Kap Stewart Formation (Rhaetian-Hettangian). Bulletin of the Geological Society of Denmark 23: 213224.
Tanner, L. H., Lucas, S. G., and Chapman, M. G. 2004. Assessing the record and causes of Late Triassic extinctions. Earth-Science Reviews 65: 103139.
Terry, L. I., Walter, G. H., Donaldson, J. S., Snow, E., Forster, P. I., and Machin, P. J. 2005. Pollination of Australian Macrozamia cycads (Zamiaceae): effectiveness and behavior of specialist vectors in a dependent mutualism. American Journal of Botany 92: 931940.
Tipper, H. W., Carter, E. S., Orchard, M. J., and Tozer, E. T. 1994. The Triassic-Jurassic (T-J) boundary in Queen Charlotte Islands, British Colombia. Geobios Mémoire Spécial 17: 484492.
Townrow, J. A. 1960. The Peltaspermaceae, a pteridosperm family of Permian and Triassic age. Palaeontology 3: 331361.
Tozer, E. T. 1979. Latest Triassic ammonoid faunas and biochronology, western Canada. Geological Survey of Canada Papers 79-1B: 127135.
Ufnar, D. F., Gonzalez, L. A., Ludvigson, G. A., Brenner, R. L., and Witzke, B. J. 2004. Evidence for increased latent heat transport during the Cretaceous (Albian) greenhouse warming. Geology 32: 10491052.
Vakhrameev, V. A. 1991. Jurassic and Cretaceous floras and climates of the Earth. Cambridge University Press, Cambridge.
Vermeij, G. J. 2004. Ecological avalanches and the two kinds of extinction. Evolutionary Ecology Research 6: 315337.
Ward, P. D., Haggart, J. W., Carter, E. S., Wilbur, D., Tipper, H. W., and Evans, T. 2001. Sudden productivity collapse associated with the Triassic-Jurassic boundary mass extinction. Science 292: 11481151.
Ward, P. D., Garrison, G. H., Williford, K. H., Kring, D. A., Goodwin, D., Beattie, M., and McRoberts, C. A. 2006. The organic carbon isotopic and paleontological record across the Triassic-Jurassic boundary at the candidate GSSP section at Ferguson Hill, Muller Canyon, Nevada, USA. Palaeogeography, Palaeoclimatology, Palaeoecology 244: 281290.
White, M. E. 1994. The greening of Gondwana. Reed, Chatswood, Australia.
Wilf, P., and Johnson, K. R. 2004. Land plant extinction at the end of the Cretaceous: a quantitative analysis of the North Dakota megafloral record. Paleobiology 30: 347368.
Williford, K. H., Ward, P. D., Garrison, G. H., and Buick, R. 2006. An extended stable organic carbon isotope record across the Triassic-Jurassic boundary in the Queen Charlotte Islands, British Columbia, Canada. Palaeogeography, Palaeoclimatology, Palaeoecology 244: 290297.
Wing, S. L., and DiMichele, W. A. 1995. Conflict between local and global changes in plant diversity through geological time. Palaios 10: 551564.
Wing, S. L., Hickey, L. J., and Swisher, C. C. 1993. Implications of an exceptional fossil flora for Late Cretaceous vegetation. Nature 363: 342344.

Macroecological responses of terrestrial vegetation to climatic and atmospheric change across the Triassic/Jurassic boundary in East Greenland

  • Jennifer C. McElwain (a1), Mihai E. Popa (a2), Stephen P. Hesselbo (a3), Matthew Haworth (a4) and Finn Surlyk (a5)...


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