Genetic differentiation between conspecific populations of Merodon avidus A (Diptera, Syrphidae)
2004
Milankov, V.R. | Ludoski, J.Lj. | Vujic, A.A. (University of Novi Sad, Novi Sad (Serbia and Montenegro). Faculty of Natural Sciences, Department of Biology and Ecology)
Allozyme variability of populations of Merodon avidus A (Milankov et al., 2001) from Dubasnica Mountain (Serbia), Morinj Bay (Montenegro) and Pindos Mountain (Greece) was analysed. The influence of gene flow on genetic differentiation among populations from the three biogeographical regions was also investigated. Genetic differentiation quantified by the Fst value, which is an inverse function of gene flow between populations, seemed to be correlated to both geographic and genetic distance (D, Nei, 1978). Namely, in the population pairs Morinj - Dubasnica (253 km air distance), Morinj - Pindos (390 km air distance) genetic differentiation and genetic distance increased with the geographic distance (Fst = 0.133, D=0.022 and Fst=0.309, D=0.052, respectively). The exception was the population pair Dubasnica - Pindos (500 km air distance), where a lower degree of genetic differentiation was observed (Fst = 0.266; D=0.047) than was expected based solely on the geographic distance. Results of this study suggest that the genetic differentiation among conspecific populations depends not only on the number of migrants (i.e. gene flow), but also on different selection pressure in different habits.
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