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Table 1 Analyses of molecular variance (AMOVA) for Isle Royale lake trout

From: Genetic and phenotypic variation along an ecological gradient in lake trout Salvelinus namaycush

Source of variation (standard AMOVA)

Fct

d.f.

Sum of squares

Variance components

Percentage of variation

P-value

Ecotype

0.002

3

9.33

0.006

0.20

0.480

Zone

−0.002

2

2.35

−0.005

−0.17

0.889

Stratum

0.010

2

15.2

0.027

0.99

<0.001*

Ecotype and zone

−0.002

11

23.8

−0.005

−0.18

0.862

Ecotype and stratum

0.004

10

29.7

0.013

0.49

0.368

Zone and stratum

0.007

8

26.2

0.020

0.71

0.207

  1. Fish were grouped by ecotype (lean, humper, siscowet, and redfin), geographic location (Zone 1, 2, and 3), and water depth strata (<50 m, 50–100 m, and >100 m). AMOVAs were based on 18 polymorphic microsatellite loci and levels of significance were extracted after 10,000 permutations as implemented in ARLEQUIN. The strength of the source of genetic partitioning can be ranked from the highest (in bold) to lowest significant Fct value (genetic distance among groups), the measure of among group differentiation. Asterisks mark significant tests at alpha = 0.05