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Macrophytes of Lake Victoria and succession after invasion of Water Hyacinth OceanDocs
Omondi, R.; Kusewa, Mwende.
The distribution of Lake Victoria (Kenya) macrophytes is described. Succession of macrophytes in the lake became more dramatic and dynamic after invasion of water hyacinth. The weed pushes and smothers other free-floating macrophytes like Pistia stratiotes. It then provides substrates for the emergent Vossia cuspidata, which later reduces its population by competition for light and nutrients. The noxious weed is believed to have led to extinction of Azolla nilotica in the lake.
Tipo: Proceedings Paper Palavras-chave: Aquatic plants; Ecological succession; Introduced species; Species extinction; Inland waters; Water reservoirs; Geographical distribution; Emergent vegetation; Competition; Water bodies; Aquatic plants; Water hyacinth; Http://aims.fao.org/aos/agrovoc/c_559; Http://aims.fao.org/aos/agrovoc/c_15267.
Ano: 2006 URL: http://hdl.handle.net/1834/1496
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Preliminary study on the food and feeding habits of Schilbe mystus (Linn., 1762) in River Nyando OceanDocs
Omondi, R.; Ogari, J..
Schilbe mystus (butterfish) is one of the "endangered species" of Lake Victoria, whose fishery was once of commercial importance. The annual landings have declined from about 400 mt in 1968 to a bare 15 mt in 1991. The average size of the species is smaller than that reported by Greenwood (1966). During the study, the size range sampled was 11.2 to 25.6 cm fork length with the majority measuring 14.0-15.0 cm FL. The food and feeding habits of the fish are discussed. Study on the gut content shows that S. mystus preys mainly on insects with chironomid larvae as the dominant prey.
Tipo: Proceedings Paper Palavras-chave: Schilbe mystus; Kenya; Victoria L.; Nyando R. Feeding behaviour Food organisms Nutrition Predation Size distribution Feeding behaviour Nutrition Predation http://aims.fao.org/aos/agrovoc/c_10778 http://aims.fao.org/aos/agrovoc/c_49892 http://aims.fao.org/aos/agrovoc/c_6162.
Ano: 1994 URL: http://hdl.handle.net/1834/1271
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Systematics and distribution of zooplankton in Lake Victoria basin, Kenya OceanDocs
Masai, D.M.; Omondi, R.; Owili, M..
Zooplankton samples were collected, using a 60~km nansen net, from Lake Victoria (Kenya) and adjacent water bodies with emphasis being placed on the different habitats within the ecosystems. A total of 116 species were identified, 63 rotifers, 24 cladocerans and 29 copepods. A number of these were new records for the zooplankton fauna for the country.
Tipo: Proceedings Paper
Ano: 2006 URL: http://hdl.handle.net/1834/2326
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