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Seasonality, the latitudinal gradient of diversity, and Eocene insects

  • S. Bruce Archibald (a1), William H. Bossert (a2), David R. Greenwood (a3) and Brian D. Farrell (a4)

Abstract

In the modern world, biotic diversity is typically higher in low-latitude tropical regions where there is abundant insolation (light and heat) and low thermal seasonality. Because these factors broadly covary with latitude, separating their possible effects on species diversity is difficult. The Eocene was a much more equable world, however, with low temperature seasonality extending into lower-insolation higher, cooler latitudes, allowing us to test these factors by comparing insect species diversity in (1) modern, temperate, low-insolation, highly seasonal Harvard Forest, Massachusetts, U.S.A., 42°29'N; (2) modern, tropical, high-insolation, low-seasonality La Selva, Costa Rica, 10°26'N, and; (3) Eocene, temperate, low-insolation, yet low-seasonality McAbee, British Columbia, Canada, above 50°N paleolatitude. We found insect diversity at McAbee to be more similar to La Selva than to Harvard Forest, with high species richness of most groups and decreased diversity of ichneumon wasps, indicating that seasonality is key to the latitudinal diversity gradient. Further, midlatitude Eocene woody dicot diversities at McAbee, Republic (Washington, U.S.A.), and Laguna del Hunco (Argentina) are also high, similar to modern tropical samples, higher than at the modern midlatitude Harvard Forest. Modern correlations between latitude, species diversity, and seasonal climates were established some time after the Eocene.

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Adams, J. M., and Woodward, F. I. 1989. Patterns in tree species richness as a test of the glacial extinction hypothesis. Nature 339:699701.
Addicott, W. O. 1970. Latitudinal gradients in Tertiary molluscan faunas of the Pacific coast. Palaeogeography, Palaeoclimatology, Palaeoecology 8:287312.
Addo-Bediako, A., Chown, S. L., and Gaston, K. J. 2000. Thermal tolerance, climatic variability and latitude. Proceedings of the Royal Society B 267:739745.
Addo-Bediako, A. 2002. Metabolic cold adaptation in insects: a large-scale perspective. Functional Ecology 16:332338.
Allen, A. P., Brown, J. H., and Gillooly, J. F. 2002. Global biodiversity, biochemical kinetics, and the energetic-equivalence rule. Science 297:15451548.
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. 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 98:62616266.
Alroy, J., Aberhan, M., Bottjer, D. J., Foote, M., Fürsich, F. T., Harries, P. J., Hendy, A. J. W., Holland, S. M., Ivany, L. C., Kiessling, W., Kosnik, M. A., Marshall, C. R., McGowan, A. J., Miller, A. I., Olszewski, T. D., Patzkowsky, M. E., Peters, S. E., Villier, L., Wagner, P. J., Bonuso, N., Borkow, P. S., Brenneis, B., Clapham, M. E., Fall, L. M., Ferguson, C. A., Hanson, V. L., Krug, A. Z., Layou, K. M., Leckey, E. H., Nürnberg, S., Powers, C. M., Sessa, J. A., Simpson, C., Tomašových, A., and Visaggi, C. C. 2008. Phanerozoic trends in the global diversity of marine invertebrates. Science 321:97100.
Anderson, J. M., Anderson, H. M., and Cruickshank, A. R. I. 1998. Late Triassic ecosystems of the Molteno/Lower Elliot biome of Southern Africa. Palaeontology 41:387421.
Anderson, J. M., Anderson, H. M., Archangelsky, S., Bamford, M., Chandra, S., Dettmann, M., Hill, R., McLoughlin, S., and Rosier, O. 1999. Patterns of Gondwana plant colonisation and diversification. Journal of African Earth Sciences 28:145167.
Anderson, K. J., and Jetz, W. 2005. The broad-scale ecology of energy expenditure of endotherms. Ecology Letters 8:310318.
Andrews, J. A. 1985. True polar wanderer: an analysis of Cenozoic and Mesozoic paleomagnetic poles. Journal of Geophysical Research 90:77377750.
Angel, M. V. 1993. Biodiversity of the Pelagic Ocean. Conservation Biology 7:760772.
Anthony, N. M., Johnson-Bawe, M., Jeffery, K., Clifford, S. L., Abernethy, K. A., Tutin, C. E., Lahm, S. A., White, L. J. T., Utley, J. F., Wickings, E. J., and Bruford, M. W. 2007. The role of Pleistocene refugia and rivers in shaping gorilla genetic diversity in central Africa. Proceedings of the National Academy of Sciences USA 104:2043220436.
Antoine, P.-O., De Franceschi, D., Flynn, J. J., Nel, A., Baby, P., Benammi, M., Calderón, Y., Espurt, N., Goswami, A., and Salas-Gismondi, R. 2006. Amber from western Amazonia reveals Neotropical diversity during the middle Miocene. Proceedings of the National Academy of Sciences USA 103:1359513600.
Archibald, S. B. 2005. New Dinopanorpidae (Insecta: Mecoptera) from the Eocene Okanagan Highlands (British Columbia, Canada; Washington State, USA). Canadian Journal of Earth Sciences 42:119136.
Archibald, S. B. 2007. Climate and species diversity: the Eocene Okanagan Highlands insect view, Vol. 1. Ph.D. dissertation. Harvard University, Cambridge.
Archibald, S. B. 2009. New Cimbrophlebiidae (Insecta: Mecoptera) from the Early Eocene McAbee, British Columbia, Canada and Republic, Washington, USA. Zootaxa 2249:5162.
Archibald, S. B. 2010. A revision of the scorpionfly family Holcorpidae (Mecoptera), with description of a new species from Early Eocene McAbee, British Columbia, Canada. Annales de la Société Entomologique de France (in press).
Archibald, S. B., and Farrell, B. D. 2003. Wheeler's dilemma. Acta Zoologica Crakoviensia 46(Suppl.):1723.
Archibald, S. B., and Makarkin, V. N. 2006. Tertiary giant lacewings (Neuroptera: Polystoechotidae) revision and description of new taxa from western North America and Denmark. Journal of Systematic Paleontology 4:119155.
Archibald, S.B., and Mathewes, R. W. 2000. Early Eocene insects from Quilchena, British Columbia, and their paleoclimatic implications. Canadian Journal of Zoology 78:14411462.
Archibald, S. B., Rasnitsyn, A. P., and Akhmetiev, M. A. 2005. The ecology and distribution of Cenozoic Eomeropidae (Mecoptera), and a new species of Eomerope Cockerell from the Early Eocene McAbee locality, British Columbia, Canada. Annals of the Entomological Society of America 98:503514.
Arhonditsis, G., Brett, M. T., and Frodge, J. 2003. Environmental control and limnological impacts of a large recurrent spring bloom in Lake Washington, USA. Environmental Management 31:603618.
Barron, E. J. 1981. Paleogeography as a climatic forcing factor. International Journal of Earth Sciences 70:737747.
Basinger, J. F. 1991. The fossil forests of the Buchanan Lake Formation (Early Tertiary), Axel Heiberg Island, Canadian Arctic Archipelago: preliminary floristics and paleoclimate. Pp. 3965 in Christie, R.L. and MacMillan, N.J., eds. Tertiary fossil forests of the Geodetic Hills, Axel Heiberg Island, Arctic Archipelago, Geological Survey of Canada. Bulletin 403.
Beaver, R. A. 1979. Host specificity of temperate and tropical animals. Nature 281:139141.
Behrensmeyer, A. K., and Hook, R. W., Badgley, C. E., Boy, J., Chapman, R. E., Dodson, P., Gastaldo, R. A., Graham, R. W., Martin, L. D., Olsen, P. E., Spicer, R. A., Taggart, R. E., and Wilson, M. V. H. 1992. Paleoenvironmental contexts and taphonomic modes. Pp. 15136 in Behrensmeyer, A. K., Damuth, J. D., DiMichele, W. A., Potts, R., Sues, H.-D., and Wing, S. L., eds. Terrestrial ecosystems through time. University of Chicago Press, Chicago.
Berger, W. H., and Wefer, G. 1990. Export production: seasonality and intermittency, and paleoceanographic implications. Global and Planetary Change 3:245254.
Bigger, M. 1976. Oscillations of tropical insect populations. Nature 259:207209.
Blackburn, T. M., and Gaston, K. J. 1996a. A sideways look at patterns in species richness, or why there are so few species outside the tropics. Biodiversity Letters 3:4453.
Blackburn, T. M. 1996b. Spatial patterns in the species richness of birds in the New World. Ecography 19:369376.
Bokma, F., Bokma, J., and Mönkkönen, M. 2001. Random processes and geographic species richness patterns: why so few species in the north? Ecography 24:4349.
Bonaccorso, E., Koch, I., and Peterson, A. T. 2006. Pleistocene fragmentation of Amazon species' ranges. Diversity and Distributions 12:157164.
Brandt, A., Gooday, A. J., Brandão, S. N., Brix, S., Brökeland, W., Cedhagen, T., Choudhury, M., Cornelius, N., Danis, B., De Mesel, I., Diaz, R. J., Gillan, D. C., Ebbe, B., Howe, J. A., Janussen, D., Kaiser, S., Linse, K., Malyutina, M., Pawlowski, J., Raupach, M., and Vanreusel, A. 2007. First insights into the biodiversity and biogeography of the Southern Ocean deep sea. Nature 447:307311.
Brey, T., Klages, M., Dahm, C., Gorny, M., Gutt, J., Hain, S., Stiller, M., Arntz, W. E., Wägele, J.-W., and Zimmermann, A. 1994. Antarctic benthic diversity. Nature 368:297.
Bromham, L., and Cardillo, M. 2003. Testing the link between the latitudinal gradient in species richness and rates of molecular evolution. Journal of Evolutionary Biology 16:200207.
Brown, J. H., Allen, A. P., and Gillooly, J. F. 2003. Heat and biodiversity. Science 299:512513.
Brown, J. H., Gillooly, J. F., Allen, A. P., Savage, V. M., and West, G. B. 2004. Toward a metabolic theory of ecology. Ecology 85:17711789.
Budantsev, L.Y. 1992. Early stages and formation and dispersal of the temperate flora in the boreal region. Botanical Reviews 58:18.
Bush, M. B. 1994. Amazonian speciation: a necessarily complex model. Journal of Biogeography 21:517.
Buzas, M. A., Collins, L. S., and Culver, S. J. 2002. Latitudinal difference in biodiversity caused by higher tropical rate of increase. Proceedings of the National Academy of Sciences USA 99:78417843.
Cardillo, M. 1999. Latitude and rates of diversification in birds and butterflies. Proceedings of the Royal Society of London B 266:12211225.
Cecca, F., Vrielynck, B., Lavoyer, T., and Gaget, H. 2005. Changes in the ammonite taxonomical diversity gradient during the late Jurassic-early Cretaceous. Journal of Biogeography 32:535547.
Chown, S. L., and Gaston, K. J. 2000. Areas, cradles and museums: the latitudinal gradient of species richness. Trends in Ecology and Evolution 15:311315.
Chown, S. L., Sinclair, B. J., Leinaas, H. P., and Gaston, K. J. 2004. Hemispheric asymmetries in biodiversity—a serious matter for ecology. PLoS Biology 2:e406.
Clarke, A. 1992. Is there a latitudinal diversity cline in the sea? Trends in Ecology and Evolution 7:286287.
Clarke, A. 2003. Costs and consequences of evolutionary temperature adaptation. Trends in Ecology and Evolution 18:573581.
Clarke, A. 2004. Is there a universal temperature dependence of metabolism? Functional Ecology 18:252256.
Clarke, A., and Crame, J. A. 1997. Diversity, latitude and time: patterns in the shallow sea. Pp. 122147 in Ormund, R. J. D., Gage, J. D., and Angel, M. V., eds. Marine Biodiversity: Patterns and Process. Cambridge University Press, New York.
Clarke, A., and Gaston, K. J. 2006. Climate, energy and diversity. Proceedings of the Royal Society B 273:22572266.
Clarke, A., and Johnston, N. M. 1999. Scaling of metabolic rate with body mass and temperature in teleost fish. Journal of Animal Ecology 68:893905.
Clarke, A., and Lidgard, S. 2000. Spatial patterns of diversity in the sea: bryozoan species richness in the North Atlantic. Journal of Animal Ecology 69:799814.
Colinvaux, P. A., and De Oliveira, P. E. 2001. Amazon plant diversity and climate through the Cenozoic. Palaeogeography, Palaeoclimatology, Palaeoecology 166:5163.
Colinvaux, P. A., De Oliveira, P. E., and Bush, M. B. 2000. Amazonian and Neotropical plant communities on glacial time-scales: the failure of the aridity and refuge hypotheses. Quaternary Science Reviews 19:141169.
Collinson, M.E. 2000. Cenozoic evolution of modern plant communities and vegetation. Pp. 223243 in Culver, J. J. and Rawson, P. F., eds. Biotic responses to global change: the last 145 million years. Cambridge University Press, Cambridge.
Colwell, R. K., and Hurtt, G. C. 1994. Nonbiological gradients in species richness and a spurious Rapoport effect. American Naturalist 144:570595.
Colwell, R. K., and Lees, D. C. 2000. The mid-domain effect: geometric constraints on the geography of species richness. Trends in Ecology and Evolution 15:7076.
Colwell, R. K., Rahbek, C., and Gotelli, N. J. 2004a. The mid-domain effect and species richness patterns: what have we learned so far? American Naturalist 163:E123.
Colwell, R. K., Mao, C. X., and Chang, J. 2004b. Interpolating, extrapolating, and comparing incidence-based species accumulation curves. Ecology 85:27172727.
Cowling, R. M., Rundel, P. W., Lamont, B. B., Arroyo, M. K., and Arianoutsou, M. 1996. Plant diversity in Mediterranean-climate regions. Trends in Ecology and Evolution 11:362366.
Cracraft, J. 1985. Biological diversification and its causes. Annals of the Missouri Botanical Garden 72:794822.
Cracraft, J., and Prum, R. O. 1988. Patterns and processes of diversification: speciation and historical congruence in some Neotropical birds. Evolution 42:603620.
Crame, J. A. 1986. Late Mesozoic bipolar faunas. Geological Magazine 123:611618.
Crame, J. A. 2000. Evolution of taxonomic diversity gradients in the marine realm: evidence from the composition of Recent bivalve faunas. Paleobiology 26:188214.
Crame, J. A. 2001. Taxonomic diversity gradients through geological time. Diversity and Distributions 7:175189.
Crame, J. A. 2002. Evolution of taxonomic diversity gradients in the marine realm: a comparison of Late Jurassic and Recent bivalve faunas. Paleobiology 28:184207.
Crame, J. A., and Rosen, B. R. 2002. Cenozoic palaeogeography and the rise of modern biodiversity patterns. In Crame, J. A. and Owen, A. W., eds. Palaeobiogeography and biodiversity change: the Ordovician and Meso-Cenozoic radiations. Geological Society of London Special Publication 194:153168.
Crampton, J. S., Foote, M., Beu, A. G., Maxwell, P. A., Cooper, R. A., Matcham, I., Marshall, B. A., and Jones, C. M. 2006. The ark was full! Constant to declining Cenozoic shallow marine biodiversity on an isolated midlatitude continent. Paleobiology 32:509532.
Crane, P. R., and Lidgard, S. 1989. Angiosperm diversification and paleolatitudinal gradients in Cretaceous floristic diversity. Science 246:675678.
Currie, D. J. 1991. Energy and large-scale patterns of animal- and plant-species richness. American Naturalist 137:2749.
Currie, D. J., and Kerr, J. T. 2008. Tests of the mid-domain hypothesis: a review of the evidence. Ecological Monographs 78:318.
Currie, D. J., Francis, A. P., and Kerr, J. T. 1999. Some general propositions about the study of spatial patterns of species richness. Ecoscience 6:392399.
Daley, B. 1972. Some problems concerning the early Tertiary climate of southern Britain. Paleogeography, Paleoclimatology, Paleoecology 11:177190.
Darwin, C. 1845. Journal of researches into the natural history and geology of the countries visited during the voyage of the H.M.S. Beagle round the world under the command of Capt. Roy, R. N. Fitz, 2d ed. John Murray, London.
Dauvin, J.-C., Kendall, M., Paterson, G., Gentil, F., Jirkov, I., Sheader, M., and de Lange, M. 1994. An initial assessment of polychaete diversity in the northeastern Atlantic Ocean. Biodiversity Letters 2:171181.
Day, R. T., Keddy, P. A., McNeill, J., and Carleton, T. 1988. Fertility and disturbance gradients: a summary model for riverine marsh vegetation. Ecology 69:10441054.
Dlussky, G. M., and Rasnitsyn, A. P. 2003 [2002]. Ants (Hymenoptera: Formicidae) of Formation Green River and some other Middle Eocene deposits of North America. Russian Entomological Journal 11:411436.
Dobzhansky, T. 1950 Evolution in the tropics. American Scientist 38:209221.
Dunn, R. R., Agosti, D., Andersen, A. N., Arnan, X., Bruhl, C. A., Cerdá, X., Ellison, A. M., Fisher, B. L., Fitzpatrick, M. C., Gibb, H., Gotelli, N. J., Gove, A. D., Guenard, B., Janda, M., Kaspari, M., Laurent, E. J., Lessard, J.-P., Longino, J. T., Majer, J. D., Menke, S. B., McGlynn, T. P., Parr, C. L., Philpott, S. M., Pfeiffer, M., Retana, J., Suarez, A. V., Vasconcelos, H. L., Weiser, M. D., and Sanders, N. J. 2009. Climatic drivers of hemispheric asymmetry in global patterns of ant species richness. Ecology Letters 12:324333.
Dyer, L. A., Singer, M. S., Lill, J. T., Stireman, J. O., Gentry, G. L., Marquis, R. J., Ricklefs, R. E., Greeney, H. F., Wagner, D. L., Morais, H. C., Diniz, I. R., Kursar, T. A., and Coley, P. D. 2007. Host specificity of Lepidoptera in tropical and temperate forests. Nature 448:696699.
Edwards, D. 1989. Silurian-Devonian paleobotany: problems, progress, and potential. Pp. 89101 in Taylor, T. N. and Taylor, E. L., eds. Antarctic Paleobiology. Springer-Verlag, New York.
Eggleton, P. 1994. Termites live in a pear-shaped world: a response to Platnick. Journal of Natural History 28:12091212.
Eggleton, P., Williams, P. H., and Gaston, K. J. 1994. Explaining global termite diversity: productivity or history? Biodiversity and Conservation 3:318330.
Eldrett, J. S., Greenwood, D. R., Harding, I. C., and Huber, M. 2009. Increased seasonality through the Eocene to Oligocene transition in northern high latitudes. Nature 459:969973.
Erwin, D. 2009. A call to the custodians of deep time. Nature 462:282283.
Erwin, D. M., and Stockey, R. A. 1991. Silicified monocotyledons from the Middle Eocene Princeton chert (Allenby Formation) of British Columbia, Canada. Review of Paleobotany and Palynology 70:147162.
Estes, R. E., and Hutchinson, H. J. 1980. Eocene lower vertebrates from Ellesmere Island, Canadian Arctic Archipelago. Paleogeography, Paleoclimatology, Paleoecology 30:324347.
Evans, K. L., and Gaston, K. J. 2005. Can the evolutionary-rates hypothesis explain species-energy relationships? Functional Ecology 19:899915.
Evans, K. L., Warren, P. H., and Gaston, K. J. 2005. Species-energy relationships at the macroecological scale: a review of the mechanisms. Biological Reviews 80:125.
Farrell, B. D. 1998. “Inordinate fondness” explained: why are there so many beetles? Science 281:555559.
Fiedler, K. 1998. Diet breadth and host plant diversity of tropical-vs. temperate zone herbivores: South-East Asian and West Palearctic butterflies as a case study. Ecological Entomology 23:285297.
Field, C. B., Behrenfeld, M. J., Randerson, J. T., and Falkowski, P. 1998. Primary production of the biosphere: integrating terrestrial and oceanic components. Science 281:237240.
Fischer, A. G. 1960. Latitudinal variations in organic diversity. Evolution 14:6481.
Fisher, R. A., Corbet, A. S., and Williams, C. B. 1943. The relation between the number of species and the number of individuals in a random sample of an animal population. Journal of Animal Ecology 12:4258.
Francis, A. P., and Currie, D. J. 2003. A globally consistent richness-climate relationship for angiosperms. American Naturalist 161:523536.
Fürsich, F. T., and Sykes, R. M. 1977. Palaeobiogeography of the European Boreal Realm during Oxfordian (Upper Jurassic) times: a quantitative approach. Neues Jahrbuch für Geologie und Paláontologie Abhandlungen 155:137161.
Gaston, K. J. 1996. Biodiversity — latitudinal gradients. Progress in Physical Geography 20:466476.
Gaston, K. J. 2000. Global patterns in diversity. Nature 405:220233.
Gaston, K. J., and Blackburn, T. M. 1996. The tropics as a museum of biological diversity: an analysis of the New World avifauna. Proceedings of the Royal Society B 263:6368.
Gaston, K. J., and Chown, S. L. 1999. Why Rapoport's rule does not generalize. Oikos 84:309312.
Gaston, K. J., Williams, P. H., Eggleton, P., and Humphries, C. J. 1995. Large scale patterns of biodiversity: spatial variation in family richness. Proceedings of the Royal Society B 260:149154.
Gaston, K. J., Blackburn, T. M., and Spicer, J. I. 1998. Rapoport's rule: time for an epitaph? Trends in Ecology and Evolution 13:7074.
Gauld, I. D., and Gaston, K. J. 1995. The Costa Rican Hymenoptera fauna. Pp. 1319 in Hanson, P. E. and Gauld, I. D., eds. The Hymenoptera of Costa Rica. Oxford University Press, New York.
Gentry, A. H. 1988. Changes in plant community diversity and floristic composition on environmental and geographical gradients. Annals of the Missouri Botanical Garden 75:134.
Goldblatt, P. 1997. Floristic diversity in the Cape Flora of South Africa. Biodiversity and Conservation 6:359377.
Gotelli, N. J., and Colwell, R. K. 2001. Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecology Letters 4:379391.
Gould, S. J. 1989. Wonderful Life: the Burgess Shale and the nature of history. Norton and Co., New York.
Gray, J. S. 2001. Antarctic marine benthic biodiversity in a worldwide latitudinal context. Polar Biology 24:633641.
Greenwood, D. R. 2005. Leaf margin analysis: taphonomic constraints. Palaios 20:498505.
Greenwood, D. R., and Christophel, D. C. 2005. The origins and Tertiary history of Australian “Tropical” rainforests. Pp. 336373 in Bermingham, E., Dick, C., and Moritz, C., eds. Tropical rainforests: past, present, and future. University of Chicago Press, Chicago.
Greenwood, D. R., and Wing, S. L. 1995. Eocene continental climates and latitudinal temperature gradients. Geology 23:10441048.
Greenwood, D. R., Moss, P. T., Rowett, A. I., Vadala, A. J., and Keefe, R. L. 2003. Plant communities and climate change in southeastern Australia during the early Paleogene. Pp. 365380 in Wing, S. L., Gingerich, P. D., Schmitz, B., and Thomas, E., eds. Causes and consequences of globally warm climates in the Early Paleogene. Geological Society of America Special Paper 369.
Greenwood, D. R., Archibald, S. B., Mathewes, R. W., and Moss, P. T. 2005. Fossil biotas from the Okanagan Highlands, southern British Columbia and northern Washington State: climates and ecosystems across an Eocene landscape. Canadian Journal of Earth Sciences 42:167185.
Grimaldi, D., and Engel, M. S. 2005. Evolution of the insects. Cambridge University Press, New York.
Haffer, J. 1969. Speciation in Amazonian forest birds. Science 165:131137.
Haffer, J. 1997. Alternative models of vertebrate speciation in Amazonia: an overview. Biodiversity and Conservation 6:451476.
Hallam, A. 1972. Diversity and density characteristics of Pliensbachian-Toarcian molluscan and brachiopod faunas of the North Atlantic margins. Lethaia 5:389412.
Harding, I. C., and Chant, L. S. 2000. Self-sedimented diatom mats as agents of exceptional fossil preservation in the Oligocene Florissant Lake Beds, Colorado, United States. Geology 28:195198.
Harrington, G. J. 2004. Structure of the North American vegetation gradient during the late Paleocene/early Eocene warm climate. Evolutionary Ecology Research 6:3348.
Harrington, G. J., and Jaramillo, C. A. 2007. Paratropical floral extinction in the Late Palaeocene-Early Eocene. Journal of the Geological Society, London 164:323332.
Harrison, S., and Cornell, H. V. 2007. Introduction: merging evolutionary and ecological approaches to understanding geographic gradients in species richness. American Naturalist 170(suppl.):S1S4.
Harvard Forest. 2006. http://harvardforest.fas.harvard.edu/data/cli.html, Faculty of Arts and Sciences Harvard University (accessed November 2006).
Hawkins, B. A. 2001. Ecology's oldest pattern? Trends in Ecology and Evolution 16:470.
Hawkins, B. A. 2004. Summer vegetation, deglaciation and the anomalous bird diversity gradient in eastern North America. Global Ecology and Biogeography 13:321325.
Hawkins, B., and Porter, E. 2003. Relative influences of current and historical factors on mammal and bird diversity patterns in deglaciated North America. Global Ecology and Biogeography 12:475481.
Hawkins, B. A., Porter, E. E., and Diniz-Filho, J. A. F. 2003. Productivity and history as predictors of the latitudinal gradient of terrestrial birds. Ecology 84:16081623.
Hayek, L. C., and Buzas, M. A. 1996. Surveying natural populations. Columbia University Press, New York.
Hecht, A. D., and Agan, B. 1972. Diversity and age relationships in recent and Miocene bivalves. Systematic Zoology 21:308312.
Heie, O. 1994. Why are there so few aphid species in the temperate areas of the Southern-Hemisphere? European Journal of Entomology. 91:127133.
Hillebrand, H. 2004. Strength, slope and variability of marine latitudinal gradients. Marine Ecology Progress Series 273:251267.
Hooker, J. J. 2000. Paleogene mammals; crises and ecological change. Pp. 333349 in Culver, S. J. and Rawson, P. F., eds. Biotic response to global change: the last 145 million years. Cambridge University Press, London.
Hoorn, C. 1997. Palynology of the Pleistocene glacial/interglacial cycles of the Amazon Fan (holes 940A, 944A, and 946A). In Flood, R. D., Piper, D. J. W., Klaus, A., and Peterson, L. C., eds. Proceedings of the Ocean Drilling Program, Scientific Results 155:397409.
Hopkins, D. J., and Johnson, K. R. 1997. First record of cycad leaves from the Eocene Republic flora. Washington Geology 25:37.
Hopper, S. D. 1979. Biogeographical aspects of speciation in the southwest Australian flora. Annual Review of Ecology and Systematics 10:399422.
Hopper, S. D., and Gioia, P. 2004. The southwest Australian floristic region: evolution and conservation of a global hot spot of biodiversity. Annual Review of Ecology, Evolution, and Systematics 35:623650
Horrell, M. A. 1991. Phytogeography and paleoclimatic interpretation of the Maestrichtian. Palaeogeography, Palaeoclimatology, Palaeoecology 86:87138.
House, M. R. 1973. An analysis of Devonian goniatite distributions. Special Papers in Palaeontology 12:305317.
Huey, R. B. 1978. Latitudinal pattern of between-altitude faunal similarity: mountains might be “higher” in the tropics. American Naturalist 112:225229.
Hunt, J. H., and Amdam, G. V. 2005. Bivoltinism as an antecedent to eusociality in the paper wasp genus Polistes . Science 308:264267.
Huston, M. A. 1994. Biological diversity: the coexistence of species on changing landscapes. Cambridge University Press, Cambridge, U.K.
Huston, M. A. 2003. Heat and biodiversity. Science 299:512.
Hutchinson, G. E. 1959. Homage to Santa Rosalia or why are there so many kinds of animals? American Naturalist 93:145159.
Jablonski, D., Roy, K., and Valentine, J. W. 2006. Out of the tropics: evolutionary dynamics of the latitudinal diversity gradient. Science 314:102106.
Jahren, A. H. 2007. The Arctic forest of the Middle Eocene. Annual Review of Earth and Planetary Sciences 35:509–40.
Janzen, D. H. 1967. Why mountain passes are higher in the tropics. American Naturalist 101:233249.
Janzen, D. H. 1981. The peak in North American ichneumonid species richness lies between 38° and 42° North. Ecology 62:532537.
Jaramillo, C., Rueda, M. J., Mora, G. 2006. Cenozoic plant diversity in the Neotropics. Science 311:18931896.
Jobbágy, E. G., and Jackson, R. B. 2000. Global controls of forest line elevation in the Northern and Southern Hemispheres. Global Ecology and Biogeography 9:253268.
Johnson, K. R., and Ellis, B. 2002. A tropical rainforest in Colorado 1.4 million years after the Cretaceous-Tertiary boundary. Science 296:23792383.
Kastner, T. P., and Goñi, M. A. 2003. Constancy in the vegetation of the Amazon Basin during the late Pleistocene: evidence from the organic matter composition of Amazon deep sea fan sediments. Geology 31:291294.
Kelley, P. H., Raymond, A., and Lutken, C. B. 1990. Carboniferous brachiopod migration and latitudinal diversity: a new palaeoclimatic method. Geological Society of London Memoirs 12:325332.
Kershaw, A. P. 1996. A bioclimatic analysis of Early to Middle Miocene brown coal floras, Latrobe Valley, southeastern Australia. Australian Journal of Botany 45:373–83.
Kershaw, A. P., and Nix, H. A. 1988. Quantitative palaeoclimatic estimates from pollen data using bioclimatic profiles of extant taxa. Journal of Biogeography 15:589602.
Klopfer, P. H. 1959. Environmental determinants of faunal diversity. American Naturalist 93:337342.
Klopfer, P. H., and MacArthur, R. H. 1960. Niche size and faunal diversity. American Naturalist 94:293300.
Kouki, J., Niemelä, P., and Viitasaari, M. 1994. Reversed latitudinal gradient in species richness of sawflies (Hymenoptera, Symphyta). Annales Zoologici Fennici 31:8388.
Kozak, K. H., and Wiens, J. J. 2007. Climatic zonation drives latitudinal variation in speciation mechanisms. Proceedings of the Royal Society B 274:29953003.
Kristensen, N. P., Scoble, M. J., and Karsholt, O. 2007. Lepidoptera phylogeny and systematics: the state of inventorying moth and butterfly diversity. Zootaxa 1668:699747.
Labandeira, C. C. 2002. Paleobiology of middle Eocene plant-insect associations from the Pacific Northwest: a preliminary report. Rocky Mountain Geology 37:3159.
Labandeira, C. C., Johnson, K. R., and Wilf, P. 2002. Impact of the terminal Cretaceous event on plant-insect associations. Proceedings of the National Academy of Sciences USA 99:20612066.
Lane, C. S. 2007. Latitudinal range variation of trees in the United States: a reanalysis of the applicability of Rapoport's rule. Professional Geographer 59:115130.
Latham, R. E., and Ricklefs, R. E. 1993. Global patterns of tree species richness in moist forests: energy-diversity theory does not account for variation in species richness. Oikos 67:325333.
Leighton, L. R. 2005. The latitudinal diversity gradient through deep time: testing the “age of the tropics” hypothesis using Carboniferous productidine brachiopods. Evolutionary Ecology 19:563581.
Lovegrove, B. G. 2000. The zoogeography of mammalian basal metabolic rate. American Naturalist 156:201219.
Lovegrove, B. G. 2003. The influence of climate on the basal metabolic rate of small mammals: a slow-fast metabolic continuum. Journal of Comparative Physiology B 173:87112.
MacArthur, R. H. 1972. Geographical ecology: patterns in the distribution of species. Harper and Row, New York.
Magurran, A. E. 2004. Measuring biological diversity. Blackwell, Maiden, Mass.
Markwick, P. J. 1994. “Equability,” continentality, and Tertiary “climate”: the crocodilian perspective. Geology 22:613616.
Martin, P. R., and McKay, J. K. 2004. Latitudinal variation in genetic divergence of populations and the potential for future speciation. Evolution 58:938945.
Martinez-Delclòs, X., and Martinell, J. 1993. Insect taphonomy experiments. Their application to the Cretaceous outcrops of lithographic limestones from Spain. Kaupia. Darmstädter Beiträge zur Naturgeschichte 2:133144.
May, R. M. 1993. Resisting resistance. Nature 361:593594.
McDade, L. A., and Hartshorn, G. S. 1994. La Selva Biological Station. Pp. 614 in McDade, L. A., Bawa, K. S., Hesenheide, H. A., and Hartshorn, G. S., eds. La Selva: ecology and natural history of a Neotropical rainforest. University of Chicago Press, Chicago.
McGowan, A. J., and Smith, A. B. 2008. Are global Phanerozoic marine diversity curves truly global? A study of the relationship between regional rock records and global Phanerozoic marine diversity. Paleobiology 34:80103.
McKenna, D. D., and Farrell, B. D. 2006. Tropical forests are both evolutionary cradles and museums of leaf beetle diversity. Proceedings of the National Academy of Sciences USA 103:1094710951.
McKenna, M. 1980. Eocene paleolatitude, climate and mammals of Ellesmere Island. Paleogeography, Paleoclimatology, Paleoecology 30:349362.
Michener, C. D. 1979. Biogeography of the bees. Annals of the Missouri Botanical Garden 66:277347.
Mittelbach, G. G., Schemske, D. W., Cornell, H. V., Allen, A. P., Brown, J. M., Bush, M. B., Harrison, S. P., Hurlbert, A. H., Knowlton, N., Lessios, H. A., McCain, C. M., McCune, A. R., McDade, L. A., McPeek, M. A., Near, T. J., Price, T. D., Ricklefs, R. E., Roy, K., Sax, D. F., Schluter, D., Sobel, J. M., and Turelli, M. 2007. Evolution and the latitudinal diversity gradient: speciation, extinction and biogeography. Ecology Letters 10:315331.
Moreau, C. S., Bell, C. D., Vila, R., Archibald, S. B., and Pierce, N. E. 2006. Phylogeny of the ants: diversification in the age of angiosperms. Science 312:101104.
Moreno, R. A., Rivadeneira, M. M., Hernández, C. E., Sampértegui, S., and Rozbaczylo, N. 2008. Do Rapoport's rule, the mid-domain effect or the source-sink hypotheses predict bathymetric patterns of polychaete richness on the Pacific coast of South America? Global Ecology and Biogeography 17:415423.
Moritz, C., Patron, J. L., Schneider, C. J., and Smith, T. B. 2000. Diversification of rainforest faunas: an integrated molecular approach. Annual Review of Ecology and Systematics 31:533563.
Mosbrugger, V., and Utescher, T. 1997. The coexistence approach—a method for quantitative reconstructions of Tertiary terrestrial palaeoclimate data using plant fossils. Palaeogeography, Palaeoclimatology, Palaeoecology 134:6186.
Moss, P. T., and Kershaw, A. P. 2000. The last glacial cycle from the humid tropics of northeastern Australia: comparison of a terrestrial and a marine record. Palaeogeography, Palaeoclimatology, Palaeoecology 155:155176.
Moss, P. T., Greenwood, D. R., and Archibald, S. B. 2005. Regional and local vegetation community dynamics of the Eocene Okanagan Highlands (British Columbia/Washington State) from palynology. Canadian Journal of Earth Sciences 42:187204.
Mustoe, G. E. 2005. Diatomaceous origin of siliceous shale in Eocene lake beds of central British Columbia. Canadian Journal of Earth Sciences 42:321–241.
Nair, K. S. S. 2007. Tropical forest insect pests: ecology, impact, and management. Cambridge University Press, New York.
Nelson, B. W., Ferreira, C. A. C., da Silva, M. F., and Kawasaki, M. L. 1990. Endemism centres, refugia and botanical collection density in Brazilian Amazonia. Nature 345:714716.
Novotny, V., Drozd, P., Miller, S. E., Kulfan, M., Janda, M., Basset, Y., and Weiblen, G. D. 2006. Why are there so many species of herbivorous insects in tropical rainforests? Science 313:11151118.
Novotny, V., Miller, S. E., Hulcr, J., Drew, R. A. I., Basset, Y., Janda, M., Setliff, G. P., Darrow, K., Stewart, A. J. A., Auga, J., Isua, B., Molem, K., Manumbor, M., Tamtiai, E., Mogia, M., and Weiblen, G. D. 2007. Low beta diversity of herbivorous insects in tropical forests. Nature 448:692695.
Noyes, J. S. 1989. The diversity of Hymenoptera in the tropics with special reference to Parasitica in Sulawesi. Ecological Entomology 14:197207.
O'Brien, E. M. 1993. Climatic gradients in woody plant species richness: towards an explanation based on an analysis of southern Africa's woody flora. Journal of Biogeography 20:181198.
O'Brien, E. M. 1998. Water-energy dynamics, climate, and prediction of woody plant species richness: an interim general model. Journal of Biogeography 25:379398.
O'Brien, N. R., Meyer, H. W., Reilly, K., Ross, A. M., and Maguire, S. 2002. Microbial taphonomic processes in the fossilization of insects and plants in the late Eocene Florissant Formation, Colorado. Rocky Mountain Geology 37:111.
Oliver, I., and Beattie, A. J. 1993. A possible method for the rapid assessment of biodiversity. Conservation Biology 7:562568.
Owens, I. P. F., Bennett, P. M., and Harvey, P. H. 1999. Species richness among birds: body size, life history, sexual selection or ecology? Proceedings of the Royal Society of London B 266:933939.
Palmer, M. W. 1994. Variation in species richness—towards a unification of hypotheses. Folia Geobotanica and Phytotaxonomica 29:511530.
Peters, S. E., and Foote, M. 2001. Biodiversity in the Phanerozoic: a reinterpretation. Paleobiology 27:583601.
Pianka, E. R. 1966. Latitudinal gradients of species diversity. American Naturalist 100:3346.
Platnick, N. I. 1991. Patterns of biodiversity: tropical vs temperate. Journal of Natural History 25:10831088.
Poore, G. C. B., and Wilson, G. D. F. 1993. Marine species richness. Nature 361:597598.
Powell, M. G. 2007. Latitudinal diversity gradients for brachiopod genera during late Palaeozoic time: links between climate, biogeography and evolutionary rates. Global Ecology and Biogeography 16:519528.
Prothero, D. R. 1994. The Late Eocene-Oligocene extinctions. Annual Review of Earth and Planetary Sciences 22:145165.
Qian, H., Fridley, J. D., and Palmer, M. W. 2007. The latitudinal gradient of species-area relationships for vascular plants of North America. American Naturalist 170:690701.
Rasnitsyn, A. P., and Quicke, D. L. J., eds. 2002. History of insects. Kluwer Academic, Dordrecht, The Netherlands.
Raup, D. M. 1972. Taxonomic diversity during the Phanerozoic. Science 177:10651071.
Raup, D. M. 1976. Species diversity in the Phanerozoic: an interpretation. Paleobiology 2:289297.
Raup, D. M., and Jablonski, D. 1993. Geography of end-Cretaceous marine bivalve extinctions. Science 260:971973.
Raymond, A. C., Kelley, P. H., and Lutken, C. B. 1989. Polar glaciers and life at the equator; the history of Dinantian and Namurian (Carboniferous) climate. Geology 17:408411.
Rees, P. M., Noto, C. R., Parrish, J. M., and Parrish, J. T. 2004. Late Jurassic climates, vegetation, and dinosaur distributions. Journal of Geology 112:643653.
Reid, E. M., and Chandler, M. E. J. 1933. The London clay flora. British Museum of Natural History, London.
Rex, M. A., Stuart, C. T., Hessler, R. R., Allen, J. A., Sanders, H. L., and Wilson, G. D. F. 1993. Global-scale latitudinal patterns of species diversity in the deep-sea benthos. Nature 365:636.
Rodriguero, M. S., and Gorla, D. E. 2004. Latitudinal gradient in species richness of the New World Triatominae (Reduviidae). Global Ecology and Biogeography 13:7584.
Rohde, K. 1978. Latitudinal differences in host-specificity of marine Monogenea and Digenea. Marine Biology 47:125134.
Rohde, K. 1992. Latitudinal gradients in species diversity: the search for the primary cause. Oikos 65:514527.
Rohde, K. 1996. Rapoport's rule is a local phenomenon and cannot explain latitudinal gradients in species diversity. Biodiversity Letters 3:1013.
Rohde, K. 1997. The larger area of the tropics does not explain latitudinal gradients in species diversity. Oikos 79:169172.
Rohde, K. 1999. Latitudinal gradients in species diversity and Rapoport's rule revisited: a review of recent work and what can parasites teach us about the causes of the gradients? Ecography 22:593613.
Rosenheim, J. A., and Tabashnik, B. E. 1991. Influence of generation time on the rate of response to selection. American Naturalist 137:527541.
Rosenzweig, M. L. 1992. Species diversity gradients: we know more and less than we thought. Journal of Mammalogy 73:715730.
Rosenzweig, M. L. 1995. Species diversity in space and time. Cambridge University Press, New York.
Rosenzweig, M. L., and Sandlin, E. A. 1997. Species diversity and latitudes: listening to area's signal. Oikos 80:172176.
Ross, C. A., and Ross, J. R. P. 1985. Carboniferous and Early Permian biogeography. Geology 13:2730.
Roy, K., Jablonski, D., and Valentine, J. W. 1994. Eastern Pacific molluscan provinces and latitudinal diversity gradient: No evidence for “Rapoport's rule.” Proceedings of the National Academy of Sciences USA 91:88718874.
Roy, K., Jablonski, D., Valentine, J. W., and Rosenberg, G. 1998. Marine latitudinal diversity gradients: tests of causal hypotheses. Proceedings of the National Academy of Sciences USA 95:36993702.
Roy, K., Jablonski, D., and Valentine, J. W. 2000. Dissecting latitudinal diversity gradients: functional groups and clades of marine bivalves. Proceedings of the Royal Society B 267:293299.
Royer, D. L., Osborne, C. P., and Beerling, D. J., 2002. High CO2 increases the freezing sensitivity of plants: implications for paleoclimatic reconstructions from fossil floras. Geology 30:963966.
Ruggiero, A., and Werenkraut, V. 2007. One-dimensional analyses of Rapoport's rule reviewed through meta-analysis. Global Ecology and Biogeography 16:401414.
Sakai, A., and Larcher, W. 1987. Frost survival of plants: responses and adaptation to freezing stress. Springer, Berlin.
Sanford, R. L. Jr., Paaby, P., Luvall, J. C., and Phillips, E. 1994. Climate, geomorphology, and aquatic systems. Pp. 1933 in McDade, L. A., Bawa, K. S., Hesenheide, H. A. and Hartshorn, G. S., eds. La Selva: ecology and natural history of a neotropical rainforest. University of Chicago Press, Chicago.
Schall, J. J., and Pianka, E. R. 1978. Geographical trends in numbers of species. Science 201:679686.
Schorn, H. E., and Wehr, W. C. 1994. The conifer flora from the Eocene uplands at Republic, Washington. Washington Geology 22:2224.
Schouten, S., Eldrett, J., Greenwood, D. R., Harding, I., Baas, M., and Damsté, J. S. S. 2008. Onset of long term cooling of Greenland near the Eocene-Oligocene boundary as revealed by branched tetraether lipids. Geology 36:147150.
Schweitzer, H. 1980. Environment and climate in the Early Tertiary of Spitsbergen. Palaeogeography, Palaeoclimatology, Palaeoecology 30:297311.
Scriber, J. M. 1973. Latitudinal gradients in larval feeding specialization of the world Papilionidae (Lepidoptera). Psyche 80:355373.
Seger, J. 1983. Partial bivoltinism may cause alternating sex-ratio biases that favour eusociality. Nature 301:5962.
Shellito, C. J., and Sloan, L. C. 2006. Reconstructing a lost Eocene Paradise, Part II. On the utility of dynamic global vegetation models in pre-Quaternary climate studies. Global and Planetary Change 50:1832.
Shellito, C. J., Sloan, L. C., and Huber, M. 2003. Climate model sensitivity to atmospheric CO2 levels in the Early-Middle Paleogene. Palaeogeography, Palaeoclimatology, Palaeoecology 193:113123.
Shen, S. Z., and Shi, G. R. 2004. Capitanian (Late Guadalupian, Permian) global brachiopod palaeobiogeography and latitudinal diversity pattern. Palaeogeography, Palaeoclimatology, Palaeoecology 208:235262.
Shi, G. R., Archbold, N. W., and Zhan, L.-P. 1995. Distribution and characteristics of mixed (transitional) mid-Permian (Late Artinskian-Ufimian) marine faunas in Asia and their palaeogeographical implications. Palaeogeography, Palaeoclimatology, Palaeoecology 114:241271.
Shi, G. R., and Grunt, T. A. 2000. Permian Gondwana-Boreal antitropicality with special reference to brachiopod faunas. Palaeogeography, Palaeoclimatology, Palaeoecology 155:239263.
Silvertown, J. 1985. History of a latitudinal diversity gradient—woody plants in Europe 13,000–1000 years bp. Journal of Biogeography 12:519525.
Simpson, G. G. 1964. Species density of North American Recent mammals. Systematic Zoology 13:5773.
Sinclair, B. J., Vernon, P., Klok, C. J., Chown, S. L. 2003. Insects at low temperatures: an ecological perspective. Trends in Ecology and Evolution 18:257262.
Sluijs, A., Schouten, S., Donders, T. H., Schoon, P. L., Röhl, U., Reichart, G.-J., Sangiorgi, F., Kim, J.-H., Damsté, J. S. Sinninghe, and Brinkhuis, H. 2009. Warm and wet conditions in the Arctic region during Eocene Thermal Maximum 2. Nature Geoscience 2:777780.
Smart, C. W., King, S. C., Gooday, A., Murray, J. W., and Thomas, E. 1994. A benthic foraminiferal proxy of pulsed organic matter paleofluxes. Marine Micropaleontology 23:8999.
Smith, A. B. 2007. Marine diversity through the Phanerozoic: problems and prospects. Journal of the Geological Society, London 164:731745.
Sohl, N. F. 1987. Cretaceous gastropods: contrasts between Tethys and the temperate provinces. Journal of Paleontology 61:10851111.
Spicer, R. A., Rees, P. McA., and Chapman, J. L. 1993. Cretaceous phytogeography and climate signals. Philosophical Transactions of the Royal Society of London B 341:277286.
Srivastava, D. S., and Lawton, J. H. 1998. Why more productive sites have more Species: an experimental test of theory using tree-hole communities. American Naturalist 152:510529.
Stauffer, D., Schulze, C., and Rohde, K. 2007. Habitat width along a latitudinal gradient. Vie et Milieu—Life and Environment 57:181187.
Stebbins, G. L. 1974. Flowering plants: evolution above the species level. Belknap Press of Harvard University Press, Cambridge.
Stenseth, N. C. 1984. The tropics: cradle or museum? Oikos 43:417420.
Stehli, F. G., Douglas, R. G., and Newell, N. D. 1969. Generation and maintenance of gradients in taxonomic diversity. Science 164:947949.
Stevens, G. C. 1989. The latitudinal gradient in geographic range: how so many species coexist in the tropics. American Naturalist 133:240256.
Storch, D. 2003. Comment on “Global biodiversity, biochemical kinetics, and the energetic-equivalence rule.” Nature 299:346b.
Taylor, J. D., Morris, N. J., and Taylor, C. N. 1980. Food specialisation and the evolution of predatory prosobranch gastropods. Palaeontology 23:375409.
Terborgh, J. 1973. On the notion of favorableness in plant ecology. American Naturalist 107:481501.
Thomas, E., and Gooday, A. J. 1996. Cenozoic deep-sea benthic foraminifers; tracers for changes in oceanic productivity? Geology 24:355358.
Thompson, R. S., Anderson, K. H. and Bartlein, P. J. 1999. Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America. U.S. Geological Survey Professional Paper 1650 A and B. Online Version 1.0, 14 December 1999 http://pubs.usgs.gov/pp/p1650-a/.
Tilman, D., and Pacala, S. 1993. The maintenance of species richness in plant communities. Pp. 1325 in Ricklefs, R. E. and Schluter, D., eds. Species diversity in ecological communities: historical and geographical perspectives. University of Chicago Press, Chicago.
Tribe, S. 2005. Eocene paleo-physiography and drainage directions, southern Interior Plateau, British Columbia. Canadian Journal of Earth Sciences 42:215230.
Turner, J. R. G. 2004. Explaining the global biodiversity gradient: energy, area, history and natural selection. Basic and Applied Ecology 5:435448.
Upchurch, G. R., and Wolfe, J. A. 1987. Mid-Cretaceous to Early Tertiary vegetation and climate: evidence from fossil leaves and woods. Pages 75106 in Friis, E. M., Chaloner, W. G., and Crane, P. R., eds. The origins of angiosperms and their biological consequences. Cambridge University Press, Cambridge.
Van der Hammen, T., and Hooghiemstra, H. 2000. Neogene and Quaternary history of vegetation, climate, and plant diversity in Amazonia. Quaternary Science Reviews 19:725742.
Vazquez, D. P., and Stevens, R. D. 2004. The latitudinal gradient in niche breadth: concepts and evidence. American Naturalist 164:E1E19.
von Humboldt, A. 1808. Ansichten der Natur mit Wissenschaftlichen Erläuterungen. Tübingen, Germany [Views of nature: or, contemplations on the sublime phenomena of creation; with scientific illustrations. 1850 translation from the German by Otté, E. C. and Bohn, H. G. H. G. Bohn, London.]
Wagner, T., Neinhuis, C., and Barthlott, W. 1996. Wettability and contaminability of insect wings as a function of their surface sculptures. Acta Zoologica 77:213225.
Waller, C. L. 2008. Variability in intertidal communities along a latitudinal gradient in the Southern Ocean. Polar Biology 31:809816.
Wehr, W. C., and Manchester, S. R. 1996. Paleobotanical significance of Eocene flowers, fruits, and seeds from Republic, Washington. Washington Geology 24:2527.
Whinnett, A., Zimmermann, M., Willmott, K. R., Herrera, N., Mallarino, R., Simpson, F., Joron, M., Lamas, G., and Mallet, J. 2005. Strikingly variable divergence times inferred across an Amazonian butterfly ‘suture zone’. Proceedings of the Royal Society B 272:25252533.
Whittle, C.-A., and Johnston, M. O. 2003. Broad-scale analysis contradicts the theory that generation time affects molecular evolutionary rates in plants. Journal of Molecular Evolution 56:223233.
Wilf, P. 1997. When are leaves good thermometers? A new case for leaf margin analysis. Paleobiology 23:373390.
Wilf, P., Cúneo, N. R., Johnson, K. R., Hicks, J. F., Wing, S. L., and Obradovich, J. D. 2003. High plant diversity in Eocene South America: evidence from Patagonia. Science 300:122125.
Wilf, P., Johnson, K. R., Cúneo, N. R., Smith, M. E., Singer, B. S., and Gandolfo, M. A. 2005a. Eocene plant diversity at Laguna del Hunco and Río Pichileufú, Patagonia, Argentina. American Naturalist 165:634650.
Wilf, P., Labandeira, C. C., Johnson, K. R., and Cúneo, N. R. 2005b. Richness of plant-insect associations in Eocene Patagonia: a legacy for South American biodiversity. Proceedings of the National Academy of Sciences USA 102:89448948.
Wilf, P., Labandeira, C. C., Johnson, K. R., and Ellis, B. 2006. Decoupled plant and insect diversity after the end-Cretaceous extinction. Science 313:11121115.
Willig, M. R., Kaufman, D. M., and Stevens, R. D. 2003. Latitudinal gradients of biodiversity: pattern, process, scale, and synthesis. Annual Review of Ecology, Evolution, and Systematics 34:273309.
Wing, S. L. 1987. Eocene and Oligocene floras and vegetation of the Rocky Mountains. Annals of the Missouri Botanical Garden 74:748784.
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., and Greenwood, D. R. 1993. Fossils and fossil climate: the case for equable continental interiors in the Eocene. In Allen, J. R. L., Hoskins, B. J., Sellwood, B. W., and Spicer, R. A., eds. Palaeoclimates and their modelling with special reference to the Mesozoic Era. Philosophical Transactions of the Royal Society of London B 341:243252.
Wing, S. L., Sues, H.-D., Tiffney, B. H., Stuckey, R. K., Weishampel, D. B., Spicer, R. A., Jablonski, D., Badgley, C. E., Wilson, M. V. H., and Kovack, W. L. 1992. Mesozoic and early Cenozoic ecosystems. Pp. 327416 in Behrensmeyer, A. K., Damuth, J. D., DiMichele, W. A., Potts, R., Sues, H.-D., and Wing, S. L., eds. Terrestrial ecosystems through time. University of Chicago Press, Chicago.
Wolfe, A. P., and Edlund, M. B. 2005. Taxonomy, phylogeny, and paleoecology of Eoseira wilsoni gen. et sp. nov., a Middle Eocene diatom (Bacillariophyceae: Aulacoseiraceae) from lake sediments at Horsefly, British Columbia, Canada. Canadian Journal of Earth Sciences 42:243257.
Wolfe, J. A. 1980. Tertiary climates and floristic relationships at high latitudes in the Northern Hemisphere. Palaeogeography, Palaeoclimatology, Palaeoecology 30:313323.
Wolfe, J. A. 1994. Tertiary climate changes at middle latitudes of western North America. Palaeogeography, Palaeoclimatology, Palaeoecology 108:195205.
Wright, D. H. 1983. Species-energy theory: an expansion of the species-area theory. Oikos 41:496506.
Wright, S., Keeling, J., and Gillman, L. 2006. The road from Santa Rosalia: a faster tempo of evolution in tropical climates. Proceedings of the National Academy of Sciences USA 103:77187722.
Zachos, J. C., Dickens, G. R., and Zeebe, R. E. 2008. An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics. Nature 451:279283.
Zanazzi, A., Kohn, M. J., MacFadden, B. J., and Terry, D. O. 2007. Large temperature drop across the Eocene-Oligocene transition in central North America. Nature 445:639642.
Zapata, F. A., Gaston, K. J., and Chown, S. L. 2003. Mid-domain models of species richness gradients: assumptions, methods and evidence. Journal of Animal Ecology 72:677690.
Zapata, F. A. 2005. The mid-domain effect revisited. American Naturalist 166:E144E148.
Ziegler, A. M., Parrish, J. M., Yao, J. P., Gyllenhaal, E. D., Rowley, D. B., Parrish, J. T., Nie, S. Y., Bekker, A., and Hulver, M. L. 1993. Early Mesozoic phytogeography and climate. Philosophical Transactions of the Royal Society of London B 341:297305.