Population Genetic Consequences of Small Population Size: Implications for Plant Conservation

TLDR

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. The study identifies circumstances likely to put rare plant species and populations at genetic risk and proposes management strategies when feasible. Using theory and available data, the authors examine how genetic drift, inbreeding, and gene flow affect genetic diversity and fitness in rare plants and small populations. Warning signs that populations may be vulnerable include changes in factors such as population size, degree of isolation, and fitness.

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 may be vulnerable include changes in factors such as population size, degree of isolation, and fitness. When possible, we suggest potential management strategies.