Low genetic variation reduces cross-compatibility and offspring fitness in populations of a narrow endemic plant with a self-incompatibility system

By M. Fischer, M. Hock, Melanie Paschke. Conservation Genetics, 2003

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Low S‐allele numbers limit mate availability, reduce seed set and skew fitness in small populations of a self‐incompatible plant (2010, background): “Recent experimental crossing studies of SI plant populations (e.g. Fischer et al. 2003; Pickup & Young 2008), show that small populations are more mate limited compared with large populations, suggesting lower S-allele diversity as the primary cause of reduced fertilization success.”
How general are positive relationships between plant population size, fitness and genetic variation? (2006, background): “…Ehlers (1999) Cestrum parqui Solanaceae Perennial Common SI Aguilar et al. (2004) Cochlearia bavarica Brassicaceae Perennial Rare SI 67.4 10 4850 Fischer et al. (2003) Cochlearia bavarica Brassicaceae Perennial Rare SI 87.8 8 3215 Paschke et al. (2002) Dactylorhiza majalis Orchidaceae Perennial…”