Inferring patterns of diversification
Moore, Brian R. Department of Ecology and Evolutionary Biology, Environmental Science Center, Yale University, New Haven, Connecticut.
- Stochastic models
- Fundamental questions
- Links to Primary Literature
- Additional Readings
Episodes of prolific cladogenesis (branching of new species from common ancestral lineages), adaptive radiation (rapid speciation of an ancestral lineage to fill diverse ecological niches), species selection (differential success of lineages owing to species-intrinsic properties), key innovations, and mass extinctions are a few examples of evolutionary phenomena involving differential rates of diversification (speciation minus extinction rate). Although traditionally based on patterns of fossil diversity chronicled in the paleontological record, the study of diversification increasingly relies upon information from phylogenetic analyses of extant species (estimates of evolutionary relationships that collectively comprise the Tree of Life). Tremendous technical progress in the generation of molecular sequence data and parallel theoretical, methodological, and computational advances in the analysis of those data have wrought an exponential increase of ever more reliable phylogenetic trees. Depending on the nature of the data and methods of analysis, phylogenetic trees can provide two sources of information relevant to the inference of diversification rates (Fig. 1): topological distribution of species diversity across branches of the tree and temporal distribution of branching events through time. These phylogenetic observations can be compared to expectations generated under various null models to explore numerous evolutionary phenomena.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 39 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information