Fig. 1

Map of Martinique, Caribbean Sea. Location of collection sites is shown in coloured diamonds. Elevation, water depth, constructed areas (Geoservices 2022, https://geoservices.ign.fr/), and rivers and streams are shown. Major rivers (in terms of volume) discharging in the south are highlighted with bold, dark blue: Oman River and Rivière-Pilote River (from left to right).