Abstract
Centaurea corymbosa is an endemic plant species restricted to a 3-km2 area in southern France. This species is known from only six small populations that are highly differentiated genetically. Matrix models based on eight years of data (1994–2001) were used to assess the pattern of variation in the demographic vital rates of this species, and to investigate the causes of their variation. Asymptotic growth rates λ varied widely between years and populations (0.613–1.424). Randomization tests were developed to test for spatial and temporal variation in the asymptotic growth rates. These tests rely on individual data on both survival and fecundity. As our demographic survey only allowed us to estimate average fecundities, additional fecundity data collected from 1994 to 1996 were used to assess the distribution of individual fecundity expected within populations under demographic stochasticity or sampling error. Randomization tests showed that asymptotic growth rates were significantly different between popu...
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