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The shell-height distribution of approximately 1000 C. farreri individuals collected from each of two C. farreri populations. For the large body size (LBS) groups, the average trait value was 75.59 ± 2.92 mm for population a and 72.02 ± 2.57 mm for population b, whereas for small body size (SBS) groups, it was 49.93 ± 3.84 and 53.04 ± 3.41 mm for populations a and b, respectively. For each population, 40 individuals were sampled from each group for association analysis.
