Otolith shape compared among all herring populations in the present study.

<p>Results from ANOVA like permutation tests based on 2000 permutations, df: degrees of freedom, Var: variance, F: F-value, P: p-value, p<0.05 indicates a significant effect. Results for the three age groups 3–5 years, 6–8 years and 9–12 years are shown separately. Local populations from western Norway are: Sykkulven, Gloppen, Lusterfjord and Lindåspollene and populations from southern Norway are Grimstad, Høvåg, Kragerø, Kilsund, Lake Landvik and Risør. The northern local population was sampled in Balsfjord (BA). The oceanic populations are the Norwegian spring- (NS) and autumn-spawners (NL) (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0130847#pone.0130847.t001" target="_blank">Table 1</a> for population ID codes). P<0.05 indicates a significant effect. Empty cells indicate data did not exist for these comparisons.</p><p>Otolith shape compared among all herring populations in the present study.