Figure 4

Genetic discontinuities (red lines) as revealed from the Barrier analysis (yellow polygons) and relative proportions of 3 genetic clusters (K = 3) for 13 Rhizophora mucronata populations in the Western Indian Ocean. The thickness of the red lines indicates the strength of genetic discontinuity between neighbouring populations. Population codes are denoted in Table 1. The background map was created with the QGIS 3.10.10 software (www.qgis.org), using detailed (1:10 m) ocean bottom relief, land and island polygons, as well as country administrative boundaries provided by Natural Earth (www.naturalearthdata.com).