Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Out of the Tropics: Evolutionary Dynamics of the Latitudinal Diversity Gradient
David Jablonski,1*Kaustuv Roy,2James W. Valentine3
The evolutionary dynamics underlying the latitudinal gradientin biodiversity have been controversial for over a century.Using a spatially explicit approach that incorporates not onlyorigination and extinction but immigration, a global analysisof genera and subgenera of marine bivalves over the past 11million years supports an "out of the tropics" model, in whichtaxa preferentially originate in the tropics and expand towardthe poles without losing their tropical presence. The tropicsare thus both a cradle and a museum of biodversity, contraryto the conceptual dichotomy dominant since 1974; a tropicaldiversity crisis would thus have profound evolutionary effectsat all latitudes.
1 Department of Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA. 2 Section of Ecology, Behavior and Evolution, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 920930116, USA. 3 Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
* To whom correspondence should be addressed. E-mail: djablons{at}uchicago.edu
Hopping Hotspots: Global Shifts in Marine Biodiversity.
W. Renema, D. R. Bellwood, J. C. Braga, K. Bromfield, R. Hall, K. G. Johnson, P. Lunt, C. P. Meyer, L. B. McMonagle, R. J. Morley, et al. (2008)
Science
321, 654-657
|Abstract »|Full Text »|PDF »
Species-genus ratios reflect a global history of diversification and range expansion in marine bivalves.
A. Z Krug, D. Jablonski, and J. W Valentine (2008)
Proc R Soc B
275, 1117-1123
|Abstract »|Full Text »|PDF »
Macroecology: more than the division of food and space among species on continents.
F. A. Smith, S. K. Lyons, S.K. Morgan Ernest, and J. H. Brown (2008)
Progress in Physical Geography
32, 115-138
|Abstract »|PDF »
Incumbency, diversity, and latitudinal gradients.
J. W. Valentine, D. Jablonski, A. Z. Krug, and K. Roy (2008)
Paleobiology
34, 169-178
|Full Text »|PDF »
A null biogeographic model for quantifying the role of migration in shaping patterns of global taxonomic richness and differentiation diversity, with implications for Ordovician biogeography.
A monograph of the entomopathogenic genera Hypocrella, Moelleriella, and Samuelsia gen. nov. (Ascomycota, Hypocreales, Clavicipitaceae), and their aschersonia-like anamorphs in the Neotropics.
Diversification Rates Increase With Population Size and Resource Concentration in an Unstructured Habitat.
M. H. H. Stevens, M. Sanchez, J. Lee, and S. E. Finkel (2007)
Genetics
177, 2243-2250
|Abstract »|Full Text »|PDF »
Contrarian clade confirms the ubiquity of spatial origination patterns in the production of latitudinal diversity gradients.
A. Z. Krug, D. Jablonski, and J. W. Valentine (2007)
PNAS
104, 18129-18134
|Abstract »|Full Text »|PDF »
Steady diversification of derived liverworts under Tertiary climatic fluctuations.
R. Wilson, J. Heinrichs, J. Hentschel, S.R. Gradstein, and H. Schneider (2007)
Biol Lett
3, 566-569
|Abstract »|Full Text »|PDF »
Exceptionally preserved North American Paleogene metatherians: adaptations and discovery of a major gap in the opossum fossil record.
M. Sanchez-Villagra, S. Ladeveze, I. Horovitz, C. Argot, J. J Hooker, T. E Macrini, T. Martin, S. Moore-Fay, C. de Muizon, T. Schmelzle, et al. (2007)
Biol Lett
3, 318-322
|Abstract »|Full Text »|PDF »
Environmental determinants of marine benthic biodiversity dynamics through Triassic Jurassic time.