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From Wikipedia, the free encyclopedia

The Yaéré, from Fula yaayre, is the name of a vast annually flooded flat savanna grassland plain, part of the extensive floodplains around the shallow and variable Lake Chad in Central Africa.[1]

When not inundated by floods the Yaéré is an ecoregion of the Tropical and subtropical grasslands, savannas, and shrublands Biome, and when flooded it is an African freshwater ecoregion in the Flooded grasslands and savannas Biome.

Geography

The Yaéré covers areas of northeasternmost Nigeria, of Niger, of southern Chad and of the Far North Region of Cameroon. The Yaéré extends from the low hills at the base of the Mandara Mountains in the southwest to Lake Chad in the north. In the east it merges with the permanent wetlands bordering the Logone.[2] At the beginning of the wet season the clays that compose the soil expand and form an imprmeable pan over which the water collects.[3]

It is connected to the more permanent wetlands along the Logone River, which flows into the endorheic Lake Chad and seasonally overflows into the surrounding Yaéré savanna. Torrential seasonal rains also drain from the Mandara Mountains, bringing a rich sediment to the floodplain. The ecological richness of the Yaéré derives from its particular conditions of wet-season flooding and dry season drought.[4]

Conservation

Drought years when rains fail, such as in the 1970s, are particularly harsh on this delicately balanced ecosystem, and on the local human population that depends on seasonal fishing.[5]

Waza National Park of Cameroon lies in the southwest part of the Yaéré savanna.

See also

Notes

  1. ^ The annual flooding is described by A. Bouchardeau, Monographie hydrologique du Logone, (Paris:Orstom) 1968; V. Bénech et al., Hydrologie et physico-chimie des eaux d'inondation de la plain d'inondation du Nord-Cameroun (in series: Cahiers Orstom: série hydrologique) 1982 and E. Naah, Restauration hydro-technique de la plaine du Yaéré, (Projet Waza Logone, Yaoundé) 1993.
  2. ^ Daniel Sighomnou, Luc Sigha Nkamdjou, and Gaston Liénou, "La plain du Yaéré dans le Nord-Cameroun: un expérience des restauration des innondations"
  3. ^ Sighomnou et al.
  4. ^ "La France au Cameroun: Mission hydrologique dans leYaéré" 
  5. ^ Sighomnou et al.

This page was last edited on 9 February 2018, at 06:48
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