African Journal of Insects

African Journal of Insects ISSN 3257-7856 Vol. 4 (5), pp. 138-146, May, 2017. © International Scholars Journals

Full Length Research Paper

Abundance and distribution of mosquito larval fauna (Diptera: Culicidae) in relation to physico-chemical indices along River Benue at Makurdi, North Central Nigeria

1Manyi, M. M ., 2Azua, E.T. and 1Agba-Injo, M. J.

1Applied Entomology and Parasitology Unit, Department of Biological Sciences, Federal University of Agriculture P M B 2373, Makurdi, Benue State, Nigeria.

2Environmental Science Unit, Department of Biological Sciences, Federal University of Agriculture P M B 2373, Makurdi, Benue State, Nigeria.

Corresponding Author.  E-mail: manyimanasseh@rocketmail.com. +2348068128355

Accepted 12 July, 2016

Abstract

Studies on mosquito fauna in relation to physico-chemical parameters along river Benue at Makurdi, were done from August to December, 2015. Mosquito larvae and water samples were collected using standard techniques at five sampling stations. Culex quinquefasciatus 93(59.23%) > Anopheles gambiae s.l. 50(31.85%) > Mansonia africanus 10(6.37%) > Aedes aegypti 4(2.55%) were identified using standard keys. Anopheles gambiae/Culex quinquefasciatus, Mansonia africanus and Aedes aegypti larvae were collected from all, four and three of the stations respectively. Larval distribution varied significantly (P < 0.05) across two stations but not across the other stations (P > 0.05). Results of the physico-chemical indices showed that temperature, dissolved oxygen, transparency and conductivity varied significantly (P < 0.05), unlike dissolved solids and phosphate ions. Only PH had significant effect (P < 0.05) on the mosquito larval abundance and distribution. The occurrence of Anopheles and Culex species across the stations implies endemicity of malaria and filariasis in Makurdi, while the presence of Aedes species reflects potential risk of arbo-viral infections in the area. This study provides information on mosquito ecology in relation to physico-chemical characteristics of breeding habitats along river Benue. The need for concerted efforts towards mosquito vector control in this area has been stressed.

Key words: Mosquitoes, physico-chemical factors, River Benue, Makurdi, Nigeria.