The global FST across the three cod samples was 0.034
indicating a low, but significant level of differentiation.
According to
Ward et al.
(1994) a low level of genetic differentiation (FST) amongst
putative populations is a common factor.
There are several reasons for
this: firstly, amongst marine subpopulations there is higher level of
gene flow than in terrestrial populations (Ward et al., 1994).