Issue |
Ann. Parasitol. Hum. Comp.
Volume 52, Number 3, 1977
|
|
---|---|---|
Page(s) | 325 - 337 | |
DOI | https://doi.org/10.1051/parasite/1977523325 | |
Published online | 21 September 2017 |
Mémoire
Existence chez Aedes (Ochlerotatus) detritus (Haliday, 1833) (Diptera-Culicidae) de Camargue de deux formes sympatriques et sexuellement isolées (espèces jumelles)
Presence in Camargue of two sympatric, sexually isolated forms of Aedes (Ochlerotatus) detritus (Haliday, 1833) [Diptera-Culicidae]
Laboratoire d’Ecologie médicale et de Pathologie parasitaire (P r J.-A. Rioux), Faculté de Médecine, F 34000 Montpellier. Laboratoire d’Electrophorèse du C.E.R.E.M. (P r L. Thaler), Université II, U.S.T.L., F 34060 Montpellier, France.
L’analyse par électrophorèse de la variabilité de quatre locus codant les enzymes Est-2, α-Gpd, Got-1 et Got-2 chez Aedes detritus permet de conclure à l’existence en Camargue de deux types de populations (A et B) sexuellement isolées (espèces jumelles). Dans les 27 gîtes larvaires étudiés, l’étude des phénotypes correspondant aux locus α-Gpd et Got-2 permet de rapporter chaque individu à l’un ou l’autre type. Par ailleurs, les populations diffèrent par leur polymorphisme pour les locus Est-2 et Got-1.
Abstract
The study of allozymic variations at four enzymatic loci (Est-2, α-Gpd, Got-1 and Got-2) in populations of Aedes detritus (Hal.) from 27 localities in Southern France has shown that this species is composed of two kinds of sympatric populations which do not interbreed in nature.
Single specimens of Aedes detritus can be attributed to one or other type of population (sibling species) by the genotype at the α-Gpd or Got-2 loci (type A populations are homozygous for Got-2R allele and the frequency of the α-GpdC allele is higher than 98 % ; type B populations are homozygous for Got-2L allele and the frequency of the α-GpdB allele is higher than 98 %). Moreover, allelic frequencies at the Est-2 and Got-1 loci are different in both types of populations.
The fact that both kinds of populations coexist in the same pond shows that the isolating mechanism is not an adaptation to the larval environment, but rather involves mechanisms pecular to adults (precopulatory mechanisms or interpopulation sterility).
© Masson, Paris 1977, transferred to Société Française de Parasitologie
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