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INDIRECT METHODS TO ESTIMATE GENE FLOW IN CAVE AND SURFACE POPULATIONS OF ANDRONISCUS DENTIGER (ISOPODA: ONISCIDEA)
Author(s) -
Gentile Gabriele,
Sbordoni Valerio
Publication year - 1998
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1998.tb01643.x
Subject(s) - gene flow , biology , population , isopoda , allele , evolutionary biology , cave , population genetics , gene , genetics , ecology , genetic variation , demography , crustacean , sociology
We estimateci gene flow among several populations of the troglophilic woodlouse Androniscus dentiger from central Italy using allozyme data. Estimates of gene flow were obtained from G ST , θ, and the private alleles method, after being tested whether the assumption of the population genetic model and the assumption of neutrality of alleles had been met. Hierarchical analysis of gene flow has been used to investigate the geographic scale at which gene exchange can actually occur. Results showed that, independent of the methods, no ongoing gene flow can be detected among populations, even among geographically proximate ones. Genetic drift is likely the main agent shaping the pattern of genetic divergence among these populations. Patterns of past and ongoing gene flow were considered, as surface populations have become genetically isolated more recently than cave populations. In general, all three methods to estimate gene flow provided Nm estimates of the same magnitude.