Skip to main content Accessibility help
×
Home

The Evolution of Biodiversity: Richness and Disparity

  • James W. Valentine (a1)

Extract

The study of biodiversity can be divided into two major aspects. One aspect is concerned with the numbers of species, genera, families, or other taxonomic units that are present within a given group of organisms, or a given region, or during a given period of time. This measure of diversity is termed richness. Richness may be represented at any geographic scale: local, such as the number of species in your backyard; regional, such as the number of species found in California; or global, such as the number of species in the entire world at present. Preservation of species richness in the present biosphere is clearly a matter of great social and scientific concern. Each species has a unique genetic makeup, and a distinctive place within an ecosystem. If a species is lost, the unique genes are also lost, and the effects on the ecosystem can be destabilizing, affecting the well-being of still other species.

Copyright

References

Hide All
Catmull, J., Hayward, D. C., McIntyre, N. E., Reece-Hoyes, J. S., Mastro, R., Callaerts, P., Ball, E. E., and Miller, D. J. 1998. Pax-6 origins—implications from the stucture of two coral Pax genes. Development, Genes, and Evolution, 208:352356.
Crimes, T. P. 1992. The record of trace fossils across the Proterozoic-Cambrian boundary, p. 177202. In Lipps, J. H. and Signor, P. W. (eds.), Origin and Early Evolution of the Metazoa. Plenum Press, New York.
Droser, M., Jensen, S., and Gehling, J. G. 1998. The first grave robbers: Early Cambrian ichnofabric. Geological Society of America Abstracts with Programs, 30:A233.
Eldredge, N., and Gould, S. J. 1972. Punctuated equilibria: an alternative to phyletic gradualism, p. 82115. In Schopf, T. J. M. (ed.), Models in Paleobiology. Freeman, Cooper and Company, San Francisco.
Foote, M. 1997. The evolution of morphological diversity. Annual Review of Ecology and Systematics, 28:129152.
Gonzales-Crespo, S., and Levine, M. 1944. Related target enhancers for Dorsal and NF-KB signaling pathways. Science, 264:255258.
Keyes, D. N., Lewis, D. L., Selegue, J. E., Pearson, B. J., Goodrich, L. V., Johnson, R. L., Gates, J., Scott, M. P., and Carroll, S. B. 1999. Recruitment of a hedgehog regulatory circuit in butterfly eyespot evolution. Science, 283:532534.
Lewis, E. B. 1978. A gene complex controlling segmentation in Drosophila . Nature, 276:565570.
Quiring, R., Waldorf, U., Kloster, U., and Gehring, W. J. 1994. Homology of the eyeless gene of Drosophila to the Small eye gene in mice and Anaridia in humans. Science, 265:785789.
Rutherford, S. L., and Lindquist, S. 1998. Hsp90 as a capacitator for morpholgoical evolution. Nature, 396:336342.
Valentine, J. W., Jablonski, D., and Erwin, D. H. 1999. Fossils, molecules and embryos: new perspectives on the Cambrian explosion. Development, 126:851859
Wills, M. A., Briggs, D. E. G., and Fortey, R. A. 1994. Disparity as an evolutionary index: a comparison of Cambrian and Recent arthropods. Paleobiology, 20:93130.

The Evolution of Biodiversity: Richness and Disparity

  • James W. Valentine (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed