Resolution:
## Figure 3.
Hierarchical spatio-temporal population clustering. Factorial correspondence analyses based on genotype of O. niloticus samples at successive hierarchical spatial and temporal levels, depicting the best
population clustering. For each population a star representation is used: every individual
is linked with a line to the barycentre of its own population (labelled using sample
code according to Table 1). At macro-geographic scale, we performed the projection
of the 10 populations representing the overall biogeographic region studied (i.e. Ethiopian Rift Valley province, Nilotic, Sudano-Sahelian regions) on factorial planes
F1 × F2 (a) and F1 × F3 (b), the projection of the Sudano-Sahelian region (i.e. West-African populations: Niger, Senegal and Volta basin populations) on factorial
plane F1 × F2 (c), the projection of the Ethiopian Rift Valley province populations (i.e. Awash basin) on factorial plane F1 × F2(d). For the micro-geographic and temporal scales analysis, we performed the projection
of the samples from the Volta basin including Kou, Kpandu and Nyinuto populations
(temporal sample series are represented by stars and the area of each geographic population
is represented by a 95% confidence ellipse), on factorial plane F1 × F2 (e). For each correspondence analysis, the percentage of variation represented by each
factorial axis is given aside of its label.
Bezault |