Genetic diversity and Isolation by Distance
The Mantel tests showed a significant correlation between genetic and
Euclidean geographic distance (IBD) for all lineages (glm;
p<0.05; Suppl. Mat. S1). As Mantel tests are prone to type I
error (Wang, 2013) a visual exploration of the data was also done. In
general, there was strong IBD, with slope estimates varying from 0.07 to
0.68 (Table 1; Figure 3; Figure S9). However, IBD slopes did not differ
significantly across lizard genera, rock-dependent vs. habitat
generalists, or in relation to annual mean precipitation (glms; all
p>0.05).
Mean individual Ho per lineage varies approximately 30-fold,
between 0.007 to 0.192 (Table 1). Except for the slightly positive value
for Gehyra gemina , all lineages showed negative Tajima’s D values
(-0.058 to -1.376; Table 1) likely reflecting recent population
fluctuations. Heteronotia geckos and Carlia amax in the
Gulf region of the AMT exhibited the most negative values (Table 1);
again, mean Ho was not related aridity, genera or habitat
specialization (glm; p>0.05).