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A study to assess mosquito species occurrences and the effects of some ecological characteristics on t heir breeding was undertaken in Accra. Five species of mosquitoes, Anopheles gambiae s.l, Culex decens, Culex quinquef asciatus, Anopheles melas and Aedes aegyptii were found occurring in a wide variety of places. C. decens were the most abundant and widely distributed, occurring sympatri cally with C. quinquefasciatus in rice fields and fishponds. The Culex species occurred largely in pools of water with hi gh nutrient levels equivalent to or slightly lower than 2.8 mg/l NH 4, 3.9 mg/1 NO 3, 3.9 mg/l NO 2, 2.2 mg/l S0 4, 9.6 mg/l PO 4 and dissolved oxygen (DO) levels of range 2.9-8.8 mg/l. The Anopheles species, on the other hand, occurred largely in po ols of water of low nutrient levels equivalent to o r less than 0.5 mg/l NH 4, 0.6 mg/l NO 3, 0.8 mg/l N0 2, 1.3 mg/l S0 4, 0.8 mg/l PO 4 and high dissolved oxygen levels ranging from 5.5-18 mg/l. The pH, habitat size and temperature were also identifie d as determinants in the species occurrence, abundance and distribution.

The occurrences and habitat characteristics of mosquitoes in Accra, Ghana