Premium
ISOLATION BY DISTANCE IN EQUILIBRIUM AND NONEQUILIBRIUM POPULATIONS OF FOUR TALITRID SPECIES IN THE MEDITERRANEAN SEA
Author(s) -
Matthaeis Elvira De,
Davolos Domenico,
Cobolli Marina,
Ketmaier Valerio
Publication year - 2000
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.0014-3820.2000.tb00705.x
Subject(s) - biology , isolation (microbiology) , ecology , mediterranean sea , mediterranean climate , isolation by distance , evolutionary biology , zoology , statistical physics , genetics , bioinformatics , genetic variation , gene flow , gene , physics
Allozymic variation at 21–23 loci was studied in 28 populations of Talitrus saltator , 23 populations of Orchestia montagui , 13 populations of O. stephenseni , and five populations of Platorchestia platensis from the Mediterranean Basin. Different levels of gene flow ( Nm θ ) were detected within each species at the scale of the whole Mediterranean: O. montagui and P. platensis had low population structure, with levels of Nm θ 1, whereas the T. saltator and O. stephenseni populations have values of Nm θ < 1. The relationship between Nm θ and geographic distance was analyzed to test for the presence of an isolation by distance pattern in the spatial genetic variation within each species. A model of isolation by distance is useful to describe the pattern of genetic structuring of study species at the scale of the whole Mediterranean: geographic distance explained from 28% to 70% of the variation in gene flow. In the Aegean area all species showed an island model of genetic structuring regardless of the levels of gene flow.