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. 2017 May 4;12(5):e0176385. doi: 10.1371/journal.pone.0176385

Table 3. LMMs investigating how experimentally changing the social status affects the levels of SOD activity in RBCs, SOD activity in sperm, and the proportion of SOD in sperm relative to total SOD activity (sperm + RBCs).

a) SOD activity in RBCs
  Random effects Estimates ± SE Z P
    Aviary 0.03 ± 0.02 1.22 0.11
    Sampling batch 0.01 ± 0.01 0.08 0.47
  Fixed effects F df P
    Intercept 3.85 ± 1.72
    Body mass 0.04 ± 0.04 1.24 1, 35.3 0.27
    Tarsus length 0.15 ± 0.07 4.42 1, 33.8 0.04
    Initial statusa 1.42 3, 37.3 0.26
        Dominant 0.20 ± 0.24
        Subordinate-1 0.50 ± 0.27
        Subordinate-2 0.18 ± 0.22
    Final statusa 1.38 3, 28.8 0.27
        Dominant -0.16 ± 0.27
        Subordinate-1 -0.04 ± 0.20
        Subordinate-2 0.11 ± 0.22
    Initial status x Final statusb 0.99 9, 34.4 0.47
        Dominant x dominant 0.24 ± 0.35
        Dominant x subordinate-1 0.53 ± 0.35
        Dominant x subordinate-2 0.28 ± 0.37
        Subordinate-1 x dominant 0.96 ± 0.43
        Subordinate-1 x subordinate-1 0.56 ± 0.34
        Subordinate-1 x subordinate-2 0.37 ± 0.36
        Subordinate-2 x dominant 0.07 ± 0.37
        Subordinate-2 x subordinate-1 0.18 ± 0.31
        Subordinate-2 x subordinate-2 -0.07 ± 0.32
b) SOD activity in sperm
  Random effects Estimates ± SE Z P
    Aviary 0 0 1
    Sampling batch 0.14 ± 0.16 0.84 0.20
  Fixed effects F df P
    Intercept 6.87 ± 3.62
    Body mass -0.02 ± 0.08 0.07 1, 39.2 0.79
    Tarsus length -0.01 ± 0.16 0.01 1, 39.2 0.93
    Initial statusa 0.43 3, 39 0.73
        Dominant -0.64 ± 0.49
        Subordinate-1 0.57 ± 0.56
        Subordinate-2 0.02 ± 0.44
    Final statusa 0.74 3, 39 0.54
        Dominant 1.01 ± 0.59
        Subordinate-1 0.15 ± 0.43
        Subordinate-2 -0.02 ± 0.48
    Initial status x Final statusb 2.29 9, 39.3 0.036
        Dominant x dominant -0.22 ± 0.74
        Dominant x subordinate-1 0.85 ± 0.76
        Dominant x subordinate-2 1.11 ± 0.78
        Subordinate-1 x dominant -2.08 ± 0.93
        Subordinate-1 x subordinate-1 -0.87 ± 0.72
        Subordinate-1 x subordinate-2 -0.09 ± 0.76
        Subordinate-2 x dominant -1.96 ± 0.77
        Subordinate-2 x subordinate-1 0.28 ± 0.63
        Subordinate-2 x subordinate-2 0.18 ± 0.70
c) Proportion of SOD activity in sperm
  Random effects Estimates ± SE Z P
    Aviary 0 0 1
    Sampling batch 0.13 ± 0.16 0.80 0.21
  Fixed effects F df P
    Intercept 3.06 ± 3.91
    Body mass -0.06 ± 0.09 0.43 1, 39.2 0.51
    Tarsus length -0.17 ± 0.17 1.02 1, 39.2 0.32
    Initial statusa 1.20 3, 39 0.32
        Dominant -0.46 ± 0.53
        Subordinate-1 0.97 ± 0.61
        Subordinate-2 -0.20 ± 0.48
    Final statusa 0.22 3, 39 0.88
        Dominant 1.20 ± 0.64
        Subordinate-1 0.18 ± 0.46
        Subordinate-2 -0.11 ± 0.52
    Initial status x Final statusb 2.40 9, 39.4 0.028
        Dominant x dominant -0.07 ± 0.80
        Dominant x subordinate-1 0.47 ± 0.82
        Dominant x subordinate-2 0.81 ± 0.84
        Subordinate-1 x dominant -2.99 ± 1.00
        Subordinate-1 x subordinate-1 -1.41 ± 0.78
        Subordinate-1 x subordinate-2 -0.42 ± 0.82
        Subordinate-2 x dominant -2.07 ± 0.84
        Subordinate-2 x subordinate-1 0.12 ± 0.68
        Subordinate-2 x subordinate-2 0.22 ± 0.76

aRelative to subordinate-3 males.

bRelative to subordinate-3 x subordinate-3 males. Values in bold indicate significance at α = 0.05; tests of random effects are based on Wald-Z.