Within taxonomic groups, there is almost always a positive relationship between the size of geographic range and the local abundance of species1 – 4. This pattern has attracted much interest, and several ecological mechanisms have been proposed as causes of it5. However, these hypotheses do not consider the effect of the extinction of rare species on range-abundance relationships. If both range size and local abundance influence the risk of extinc- tion, species with small ranges might avoid extinction if they have high local abundance, whereas species with low local abundance might avoid extinction if they are widespread; species with both small range and low local abundance should be at high risk. This interaction between range, abundance and extinction should produce negative correlations between range and abundance in groups that have experienced many extinctions. Here I test this idea using Australian marsupials, and I show that although the relationship between range size and local abundance is positive for recently evolved species, it is negative for ancient species. This indicates that positive relationships between range size and abundance may be generated during adaptive radiation, but are then gradually reversed as a result of differential extinction

Item Type:	Refereed Article
Keywords:	macroecology
Research Division:	Biological Sciences
Research Group:	Ecology
Research Field:	Population Ecology
Objective Division:	Environment
Objective Group:	Flora, Fauna and Biodiversity
Objective Field:	Flora, Fauna and Biodiversity of environments not elsewhere classified
Author:	Johnson, CN (Professor Christopher Johnson)
ID Code:	82992
Year Published:	1998
Web of Science® Times Cited:	130
Deposited By:	Zoology
Deposited On:	2013-02-26
Last Modified:	2013-06-18
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