Population genetic consequences of small population size: Implications for plant conservation

Publication Type:

Journal Article

Authors:

Norman C. Ellstrand; Diane R. Elam

Source:

Annual Review of Ecology and Systematics, Annual Review Inc., Volume 24, p.217-242 (1993)

Call Number:

A93ELL01IDUS

Keywords:

Astragalus fabaceae, diversity, gene flow, genetic drift, hybridization inbreeding depression, inbreeding depression, local adaptation, mating-system, rare, rare and endangered plants, Salvia pratensis, Scabiosa columbaria, seed banks, subdivided populations

Abstract:

Although the potential genetic risks associated with rare or endangered plants and small populations have been discussed previously, the practical role of population genetics in plant conservation remains unclear. Using theory and the available data, we examine the effects of genetic drift, inbreeding, and gene flow on genetic diversity and fitness in rare plants and small populations. We identify those circumstances that are likely to put these plant species and populations at genetic risk. Warning signs that populations maybe vulnerable include changes in factors such as population size, degree of isolation, and fitness. When possible, we suggest potential management strategies.