oa African Entomology - Vectorial capacity, species diversity and population cycles of anopheline mosquitoes (Diptera: Culicidae) from indoor light-trap collections in a house in southeastern Tanzania



Mosquitoes were collected by means of a light-trap operated for 45 nights in a house in southeastern Tanzania during the rainy season of 1989. Forty eight thousand and forty nine anophelines of 12 species were collected. The plot of number caught versus rank order was best descriptionbed by a log series. The overall Simpson index of diversity was 0.71. A maximum correlation between the index of diversity and rainfall occurred after a nine-day lag. Anopheles gambiae s.l., An. funestus Giles and An. squamosus Theobald were the most common mosquitoes, accounting for 38 %,25 % and 25 % of the total collected. Parous rates were similar in all three species. Time-series estimates of survival rate based on time-series analysis were not possible due to non-significant cross correlations between nulliparous and parous insects. Survival, from parous rate determination, was estimated to be 0.79, 0.78 and 0.79 per day. Sporozoite rates, determined by enzyme-linked immunosorbent assay (ELISA), in An. Gambiae s.1. and An. funestus were 1.2 % and 0.7 % respectively. All other species tested were negative. Numbers of An. squamosus varied according to rainfall. 7.9 % of the An. Squamosus were infected with a nematode parasite. The population of An. funestus peaked just before the the rice harvest, when a maximum of 1275 individuals were collected during one night. Peak An. welleomi Theobald numbers were recorded in May after the main rains had ended. Numbers of An. coustani Laveran and An. ziemanni Grunberg fluctuated synchronously.


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