The National Academies

Advisers to the Nation on Science, Engineering and Medicine In the Light of Evolution Volume II Biodiversity and Extinction In the Light of Evolution Volume II Biodiversity and Extinction JOHN C. AVISE, STEPHEN P. HUBBELL, and FRANCISCO J. AYALA, Editors THE NATIONAL ACADEMIES PRESS Washington, D.C. www.nap.edu THE NATIONAL ACADEMIES PRESS 500 Fifth Street., N.W. Washington, DC 20001 This volume is based on the Arthur M. Sackler Colloquium of the National Academy of Sciences, In the Light of...

Extinction Selectivity Changes At The Most Extreme Events

A broad array of organismic and clade-level traits enter into extinction risk for present-day species. For example, in evaluating extinction risk in present-day terrestrial vertebrates, Purvis and colleagues (Purvis et al., 2000b, 2005a Davies et al., Chapter 14, this volume) found mixed, but significant, effects for body size, a consistent inverse relation between extinction risk and both abundance and geographic range, and either a positive relation or no effect for habitat specialization....

Into a Less Peopled Less Hostile Planet

The human impact on biodiversity is a product of three root factors, summarized in the heuristic I PAT identity (Ehrlich and Holdren, 1971). The overall Impact (encompassing all of the drivers of biodiversity loss discussed above) is the product of Population size, per capita Affluence, and the Technologies (and socioeconomic-political systems) used to generate affluence. ''Affluence'' in this context is simply per capita consumption, and ''socioeconomic-political systems'' refer to the...