The relationship between microfilarial density and uptake of Foleyella candezi microfilariae by Aedes aegypti.
There was a linear regression in the square root of the numbers of microfilariae abstracted (square root of y) by Aedes aegypti refm strain on the square root of the density of microfilariae in the infecting blood (square root of x). The linear regression is represented by the equation, square root of y = 0.080,59 square root of x + 4.556 (r = 0.627; P less than 0.01). - Ae. aegypti abstracted microfilariae about 1.60 times that expected from the infecting blood meal. This value however decreased, when the microfilariae in the infecting blood meal increased possibly due to error in counting large numbers of microfilariae. - The volumes of blood ingested by three strains of Aedes aegypti (+fm/+fm, refm/refm, reF/reF) appeared to be unaffected by genes controlling susceptibility or refractoriness to filariae (Foleyella candezi). - The Duncan's multiple range test showed similarity (p greater than 0.01) in percentage uptake efficiency, 157.28 and 164.28 for black-eyed homozygous susceptible and red-eyed homozygous susceptible strains respectively. There was significant difference between either of the homozygous susceptible strains and the homozygous refractory triple marker strain (calculated F-value = 28.61; critical tabular F-value = 10.92; p less than 0.01). Therefore, the % uptake efficiency of Ae. aegypti for F. candezi microfilariae is influenced by the gene (fm) which also allows the development of the filariae. - The percentage efficiency (observed/expected X 100) in abstracting microfilariae from infecting blood source by homozygous susceptible strains was about twice that (80.98%) observed for a homozygous refractory triple marker strain.
Obiamiwe
B A
BA
Department of Zoology, University of Benin, Nigeria.
Ezomonye
L I
LI
Orogun
M O
MO
D000330:Aedes / Q000235:genetics / Q000469:parasitology*; D000704:Analysis of Variance; D000818:Animals; D005370:Filarioidea / Q000254:growth & development*; D005838:Genotype; D006720:Homozygote; D006790:Host-Parasite Interactions; D007303:Insect Vectors / Q000235:genetics / Q000469:parasitology*; D008842:Microfilariae / Q000254:growth & development; D012044:Regression Analysis