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Table 1 Genetic individual assignment of tagged cod in groups with different migratory behaviours

From: Population structure in Atlantic cod in the eastern North Sea-Skagerrak-Kattegat: early life stage dispersal and adult migration

Group Numbers Proportions
  Kattegat North Sea Sum Kattegat North Sea
a
Reference samples:
Kattegat 359 76 435 0.83 0.17
North Sea/W Skagerrak 43 158 201 0.21 0.79
Behavioural groups:
Skagerrak → North Sea 10 17 27 0.37 0.63
Kattegat → North Sea 2 3 5 0.40 0.60
Skagerrak → Kattegat 3 0 3 1.00 0.00
Nonmigratory Skagerrak 11 18 29 0.38 0.62
Nonmigratory Kattegat 24 12 36 0.67 0.33
b
Assignment to Migration towards     
Kattegat North Sea    
Kattegat 3 12    
North Sea/W Skagerrak 0 20    
  1. Each of the in total 100 tagged cod were assigned to either the Kattegat reference or to the North Sea/W Skagerrak spawning reference. For definitions of groups see Table 2, Fig. 3 and text. Self-assignment of reference samples to either Kattegat or North Sea/W Skagerrak was performed by leaving the assigned individual out of the sample
  2. Summarizing assignment for the 35 migrating individuals from part a. An exact test of independence showed that fish were more likely to migrate towards the population they were genetically assigned to (P = 0.032), indicating philopatric behaviour in the migrating fish