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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