The bed of the watercourse widens until it reaches savannah trees, which consequently find themselves on the riverbank.
To adequately sample species potentially confined to watercourses, we examined streams separately; riparian sampling zones could be located at eight of the 12 elevations.
Observations on the range of plant species, their abundance, vegetation structure, type of watercourse and banks and the different human activities practised locally were recorded.
Major watercourses and direction of flow are shown in grey.
The public sector also has full responsibility for irrigation up to the outlets to watercourses.
Mosses and lichens occur in the vicinity of small ephemeral watercourses.
The lower or western par ts of the watercourses are depicted with straight edges, which might indicate that water is flowing in a canal.
A response to ecotones was revealed for the amphibian subset only and associated with the presence or absence of watercourses.
