Fish faunas of the Chamo-Abaya and Chew Bahr basins in southern portion of the Ethiopian Rift Valley: origin and prospects on survival.
2009
Redeat Habteselassie;Golubtsov,Alexander S.(Student)
Fish faunas of the Chamo-Abaya (21 species) and Chew Bahr (12-14 species) basins are more diverse than in other basins of the Ethiopian Rift Valley.Their increased diversity is determained by past connections to the Omo-Turkana basin, while the latter was connected to the White Nile system seven thousand years PB.The vast majority of fish species inhabiting the Chamo-Abaya and Chew Bahr basins are of Nilo-Sudan origin; however, some elements of the EAst-Afrocam ocjtjupfaima (Barbis lerstemoo amd :abep cu;omdrocis) are present.In contrast to other basines in the Ethiopian Rift Valley, the number of endemic fish species in the Chamo-Abaya and Chew Bahr basins is low.As in the Rift Valley basins,the fish diversity depends on the balance between extinction, driven mostly by episodic desiccation, and dispersal from adjacent water systems.The higher diversity of the Chamo-Abaya ichthyofauna, compared to that of the Chew Bahr basin, is apparently caused by the larger volume of water in the former bbasin and , consequentl, by more stable hydrological conditions.However, the dispersal routes of most fish species now inhabiting the Chamo-Abaya basin were via the Chew Bahr basin.During last twenty years intensive development of fisheries in Chamo and Abay lakes has driven local populations of commercieal fishes to verge(e.g. Mormyrus caschive,Labeo horie and L. niloticus)to the verge of extinction.Currently, the main threat to the Chew Bahr ichthyofauna is damming of tributaries for irrigation.
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