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Distribution and occurrence of mosquito species in the municipal areas of Imo State, Nigeria

Author(s): Ifeyinwa Celestina MGBEMENA | Tochi EBE

Journal: Analele Universitatii din Oradea, Fascicula Biologie
ISSN 1224-5119

Volume: TOM XIX;
Issue: 2;
Start page: 93;
Date: 2012;
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Keywords: Drainage | Distribution | Culex | Vectors | Markets

A study of the ecology of drainage - breeding mosquito vectors was conducted in the three urban centers (Owerri, Orlu and Okigwe) of Imo State, Nigeria. Four drainage sites located around markets, residential, stream and hotel premises were selected in each urban centre. Dipping method of sampling was employed and a total of 8,820 mosquitoes comprising eight species namely; Aedes aegypti, Aedes vittatus, Culex quinquefasciatus, Culex tigripes, Culex horridus, Culex cinereus, Culex annuliorus and Anopheles gambiae were encountered; in Owerri and Orlu with Cx. cinereus being completely absent in Okigwe. Cx. quinquefasciatus was predominantly present in all drainage sites with the highest occurrence of 4,474(50.74%) followed by Aedes aegypti 1814 (20.57%), An .gambiae 945(10.71%), Cx. tigripes 484 (5.48%) Ae. vittatus 420 (4.76%), Cx. horridus 264 (02.99%), Cx. cinereus 261 (2.96%), Cx. annuliorus 159 (1.88%). Of all sites sampled, market drainages had the highest abundance of mosquitoes which was significantly higher than (ANOVA, P≤ 0.05) those found in the residential, streams and hotel premises. Residential drainages recorded the second highest density followed by stream/vegetation drainages and hotel drainages which had the least. The abundance and distribution of mosquitoes in Owerri (130.06) the State Capital was significantly higher (ANOVA, P≤ 0.05) than those for Orlu (93.44) and Okigwe (52.13). The mosquito species identified in this study are of public health importance and there is an urgent need to desilt and clean up these drainages for free flow of water. This will not only rid these species of breeding sites but also free the State of the diseases associated with these organisms.
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