title: [Observations on tsetse flies in a forest focus of human trypanosomiasis in Ivory Coast. 3. Dispersal and distribution of fly populations around a village (author's transl)].
abstract: In the Vavoua human trypanosomiasis focus (forest zone of Ivory Coast) four tsetse fly catching series, of nine days each, were made during the rainy season using eighty five biconical traps. The dispersion of flies in the study area was studied by the mark-release-recapture method. Two series of two sets of capture-mark-release were carried out. In the first set flies were captured, marked and released in their point of origin and in the second set captured and marked in the village periphery but released in coffee plantations and vice versa. A total of 10198 tsetse flies were marked and released and 267 were recaptured. There was no difference between recapture rates of the different village or plantation released G. palpalis; this suggested that the same population was living in different biotops. Males and females from the periphery of the village behaved differently. Males dispersed evenly in contrast to females which remained in their original area. This difference in dispersion of the two sexes may be of epidmiological importance for human trypanosomiasis. Of interest was the discovery of a small community of peri-domestic G. pallicera during the periods March--April and May. The estimation of tsetse population by the Lincoln Index, is related to the dispersive power of the species concerned. When evaluated through the recapture rate this was found to be ten and seven times higher for G. pallicera and G. nigrofusca respectively, than for G. palpalis. This difference may be important in explaining the phenomenon of reinvasion and the little apparent effect of insecticidal control on the two former species.
mesh_terms: D000818:Animals; D007560:Cote d'Ivoire; D005260:Female; D006801:Humans; D007303:Insect Vectors / Q000469:parasitology*; D008297:Male; D014353:Trypanosomiasis, African / Q000453:epidemiology*; D014370:Tsetse Flies / Q000469:parasitology*
vernacular_title: Observations sur les glossines d'un foyer forestier de trypanosomiase humaine en Cote d'Lvoire. 3. Dispersion et distribution des populations autour d'un village.