Ecological Archives
E087-017-A1
Darren W. Johnson. 2006. Density dependence in marine fish populations revealed at small and large spatial scales. Ecology 87:319325.
Appendix A. Summary of linear, mixed-effects regressions used to test for overall presence of temporal density dependence in mortality of juvenile rockfish. Polynomial models were included to determine whether the relationship between mortality and density was significantly curvilinear, rather than linear. Data are presented for both the blue rockfish (Sebastes mystinus) and the KGB species complex (S. atrovirens, S. carnatus, and S. chrysomelas).
| |
|
|
Value
|
SE
|
df
|
t value
|
P value
|
| S. mystinus |
Full model
|
Intercept
|
0.4871
|
0.68133
|
16
|
0.7149
|
0.485
|
| |
|
Density
|
0.05973
|
0.04943
|
16
|
1.2084
|
0.2445
|
| |
|
Density2
|
-0.0003
|
0.00071
|
16
|
-0.3519
|
0.7295
|
| |
|
|
|
|
|
|
|
| |
Reduced model
|
Intercept
|
0.641
|
0.501
|
17
|
1.267
|
0.222
|
| |
|
Density
|
0.043
|
0.012
|
17
|
3.507
|
0.0027
|
| |
|
|
|
|
|
|
|
| KGB |
Full model
|
Intercept
|
1.8588
|
0.48478
|
16
|
3.8343
|
0.0015
|
| |
|
Density
|
0.1372
|
0.03805
|
16
|
3.6067
|
0.0024
|
| |
|
Density2
|
-0.001
|
0.00041
|
16
|
-2.4221
|
0.0277
|
| |
|
|
|
|
|
|
|
| log(KGB) |
|
Intercept
|
2.533
|
0.437
|
17
|
5.78
|
<0.0001
|
| |
|
log(density)
|
0.0489
|
0.012
|
17
|
3.97
|
0.001
|
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