PMC3150414_01
Correlation of log population size and sex ratio (F/M) of 30 populations on the fragmented islands (closed circle) and one population on the mainland (open circle), The Pearson correlation coefficient r = 0.661, p<0.001.
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The correlation of the sex ratios (F/M) of 31 populations and population size was found under the hypothesis of pollen limitation (Fig. 3).
Sex ratio (F/M) of the mainland population (triangle), 3 populations with more than 100 individuals (star), and 27 populations less 100 individuals (diamond), by age class.
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This phenomenon only existed in small populations (less than 100 individuals), while individuals older than 50 years displayed the theoretical 1:1 sex ratio (Fig. 4). The results indicated that sex proportion changed significantly after the fragmentation in small island populations, while the sex proportion of large island and mainland populations could maintain a relatively stable sex ratio around 1:1 through the whole years (Table 2, Fig. 4).