University of Khartoum

Behavioural And Microbiological Studies On The Mosquito Culex Quinquefasciatus Say

Behavioural And Microbiological Studies On The Mosquito Culex Quinquefasciatus Say

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Title: Behavioural And Microbiological Studies On The Mosquito Culex Quinquefasciatus Say
Author: El-Sayed, Eiman Ahmed
Abstract: This study was carried out to investigate some biological, behavioural and microbiological aspects of the mosquito Culex quinquefasciatus Say. The field study showed that the rate of oviposition in Khartoum during the period July 03-July 04 was high in September, October and December 03, and it decreased in August and November 03 and May 04.Highest numbers of eggs per raft were recorded during October 03, April 04 and July 04; while the lowest numbers were recorded during August (02 and03) Field studies exhibited that there was one peak of the flight activity for the first 6hrs. of the night for both sexes at 19:00-20:00 pm. Experiments on oviposition showed that gravid females L9;preferL8;L8; laying eggs on the sites that contained mosquito larvae, they also prefer large-sized containers and lowest level of water depths. Laying of rafts lasted for about 10 minutes, and the eggs colour changed from white to brown or dark within two hours. Similar counts or percentages of oviposition were obtained during either the day or night. Incubation periods exceeded 24hours when eggs were exposed to temperatures below 30°C. Rearing larvae at different room temperatures showed that the optimum temperature for high percentages of emerging adults (an average of 98%) was 24°C .The effect of crowding (partial starvation) upon the development and sex ratio revealed that crowding did increase the overall developmental time beside it increased the mortality in larvae. Crowding also effected the sex ratio. -------------------- Both Gram-positive and gram-negative bacteria were isolated from the mid-gut of the fourth instar larvae of both clean and septic tanks water. Staphylococcus spp. and Bacillus spp. were found in larvae reared in clean or septic water. Bacteria isolated from the mid-gut of clean water larvae were Staphylococcus spp. and Bacillus spp. and bacteria isolated from the septic water larvae were Proteus sp. Staphylococcus spp. Bacillus spp., Corynebacteria spp., Rothia sp., Aerococcus sp. and Kurthia sp
Description: 131 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/13481
Date: 2015-06-17


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