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Table 4 Morphological data from historic walleye andblue pike” samples, with mean, standard deviation (SD), and range of values

From: A population genetic window into the past and future of the walleye Sander vitreus: relation to historic walleye and the extinct “blue pike” S. v. “glaucus”

 

Historic walleye (N = 51)

“Blue pike” (N = 52)

Measurement

Mean ± SD

Range

Mean ± SD

Range

Standard length (mm)

264.3 ± 49.9

187 - 385

248.8 ± 37.7

202 - 362

% Standard length

    

Body depth

20.1 ± 1.9

15.8 - 24.2

20.4 ± 2.1

16.3 - 24.9

Head length

30.7 ± 0.8

28.9 - 32.2

30.6 ± 1.8

27.9 - 40.7

% Head length

    

Cheek length

48.3 ± 1.8

44.3 - 52.5

48.4 ± 1.6

46.3 - 55.7

Upper jaw length

38.6 ± 3.1

33.6 - 43.9

37.9 ± 3.7

31.0 - 44.9

Lower jaw length

38.8 ± 4.1

30.1 - 43.7

38.2 ± 4.3

31.6 - 44.1

Head width

41.6 ± 4.5

34.3 - 55.0

38.6 ± 2.5

32.1 - 44.0**

Interorbital width

14.9 ± 1.1

12.8 - 17.3

14.1 ± 1.2

11.2 - 17.2**

Orbit diameter

20.7 ± 1.8

17.4 - 26.4

21.9 ± 2.1

16.6 - 25.9**

Orbit: interorbital

1.4 ± 0.2

1.1 - 2.0

1.6 ± 0.2

1.0 - 2.2**

Upper: lower jaw

1.0 ± 0.2

0.8 - 1.3

1.0 ± 0.2

0.7 - 1.3

Meristic

Mode

Range

Mode

Range

First dorsal fin rays

14

11 - 16

12

11 - 15

Second dorsal fin rays

21

19 - 22

20

13 - 22**

Pectoral fin rays

15

11 - 17

14

10 - 16

Pelvic fin rays

6

5 - 8

7

5 - 8**

Anal fin rays

14

11 - 16

14

11–16

  1. Body and head measurements are given as percentage of standard or head lengths, respectively. Ratios are between the original measurement values.
  2. Additional file 11 lists individuals examined. ** = statistically significant comparisons between walleye and “blue pike” using Student’s t and Mann Whitney U tests. Overall, walleye and “blue pike”differed according to the nonparametric MANOVA (morphometric: F = 4.34, degrees of freedom (df) = 1, p < 0.001; meristic: F = 4.13, df = 1, p = 0.001).