Population size reduction can threaten long-term persistence of plant populations through loss of genetic diversity and inbreeding depression.
Blambert et al. evaluate the consequences of population size reduction by comparing mating patterns, levels of genetic diversity and inbreeding depression of the rare and fragmented Jumellea fragrans and the widespread J. rossii. Population size reduction had a negative impact on genetic diversity of J. fragrans, but factors such as mating system or population history can limit the effects.
Laury Blambert, Bertrand Mallet, Laurence Humeau, Thierry Pailler, 2016, 'Reproductive patterns, genetic diversity and inbreeding depression in two closely relatedJumelleaspecies with contrasting patterns of commonness and distribution', Annals of Botany, vol. 118, no. 1, pp. 93-103 http://dx.doi.org/10.1093/aob/mcw014