Table 3. Estimates of contemporary Ne of four geographic population clusters of Nile crocodiles based on the linkage disequilibrium (LD) method; and the heterozygosity excess (He) test as an indication of population expansion and contraction based on heterozygosity excess/deficiency under the infinite alleles (IAM) and stepwise mutation (SMM) models (Wilcoxon-sign rank test, P-value), and allele frequency distribution mode shifts.
| Population Group | Ne (95% CI) | Evidence for Population Expansion/Contraction | ||||
|---|---|---|---|---|---|---|
| Wilcoxon-sign rank test P-value (IAM) | Wilcoxon-sign rank test P-value (SMM) | Allele Frequency Mode Shift (Y/N) |
||||
| He def | He exc | He def | He exc | |||
| Kunene River | ∞ (19.8 - ∞) |
1.000 | 0.000 | 0.999 | 0.001 | Y |
| Okavango River | 115.9 (76.6–213.9) |
1.000 | 0.000 | 0.998 | 0.003 | Y |
| Lower Shire River | 199.0 (107.5–868.1) |
1.000 | 0.000 | 0.992 | 0.011 | N |
| Limpopo, South Africa | ∞ (25.5 - ∞) |
1.000 | 0.001 | 0.999 | 0.002 | Y |
| KwaZulu-Natal, South Africa | ∞ (17.0 - ∞) |
0.793 | 0.232 | 0.139 | 0.880 | Y |