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Spatially varying natural selection in a fish hybrid zone
Author(s) -
Crespin L.,
Berrebi P.,
Lebreton JD.
Publication year - 2002
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2002.tb00905.x
Subject(s) - barbel , biology , barbus , selection (genetic algorithm) , natural selection , fish <actinopterygii> , ecology , fishery , zoology , cyprinidae , artificial intelligence , computer science
A capture‐mark‐recapture (CMR) study in a hybrid zone between two species of barbel, Barbus barbus and Barbus meridionalis , in the Lergue River (southern France) failed to reject the null hypothesis of no difference in survival among phenotypes. Power calculations indicated that very intensive fieldwork should be carried out if this hypothesis was to be investigated again. The study demonstrated, however, that there were marked differences in survival between upstream and downstream sites. It is suggested that there is an environmental gradient of selection along the hybrid zone (extrinsic component of natural selection).