Est-2 and Est-3 linkage disequilibrium was investigated in 43 natural populations. An association between Est-2(0.64) and Est-3A alleles (or its reverse, Est-3Null and alleles other than Est-2(0.64) was not observed in 19 (1.2%) of the 1599 mosquitoes analyzed, whereas it should have been found in nearly 400 (25%) individuals if the two loci were in equilibrium. This observation is discussed in relation to organophosphate resistance and genetic distance of the two genes.

No abstract

1) Four sets of experiments were devised to evaluate the absolute size of aedine larval populations. Three methods were used and compared: 'capture-recapture', 'removal' and 'dipping' methods.(2) The results show that 'dipping' gives estimates of population size similar to those obtained with the two other methods, providing that a strict procedure is followed.(3) Since the 'dipping' technique is particularly easy, the results offer new possibilities for the study of population dynamics in Culicidae.

Écologie de deux A edes halophiles, A edes (O.) caspius (Pallas, 1771) et A edes (O.) d e tr itus (Haliday, 1833) dans le midi de la France I.-Structure chorionique et critères d'identification des deux espèces au stade oeuf par A. GABINAUD, H. CROSET, J. COUSSERANS et J.-A

No abstract