Comparison of the life table characteristics of anopheles sergentii [diptera: culicidae] from two malarious areas in Egypt

ABSTRACT

Life table characteristics were examined for the malaria vector, an sergentii from two Faiyum villages Tersa [T] and El Nazlah [N] and from Siwa oasis [Sw] under constant laboratory conditions at 25°C and 70% RH. Females of T, N and Sw completed 4, 5, and 2 gonotrophic cycles [gc] respectively. The first gc required a significantly longer period [p < 0.05] than the subsequent ones. Development times for Sw immatures were longer [p < 0.05] than for the other colonies. Life expectancies at emergence for males of the 3 colonies were significantly shorter than for their respective females. Generation time was shorter [p < 0.05] for T [mean = 31.15 days] than for Sw [37.81 days] or N [43.64 days] colonies. The birth rate of Sw colony [mean 0.33 o+ o+/o+] was significantly higher [p < 0.05] than those of the other colonies. The other biological parameters fecundity, egg hatch times and rates, survivorship from egg eclosion to adult emergence, male and survivorships, net reproductive rate, -intrinsic rate of increase all showed no colony variations. The study concluded that variation among colonies in certain biological aspects may not reflect strain differences