Latitudinal gradient of species diversity: multi-scale variability in rocky intertidal sessile assemblages along the Northwestern Pacific coast
Authors
Popul Ecol (2004) 46:159–170
Results of the hierarchical linear models applied to examine whether latitude affects the slope or intercept of the regression equations for \(\bar \alpha _2 \) against α_{3}. In the analyses, both latitude and α_{3} were treated as fixed independent variables
Independent variables |
Species richness |
Simpson’s diversity index | ||
---|---|---|---|---|
Estimated regression coefficient (mean±SE) |
P |
Estimated regression coefficient (mean±SE) |
P | |
Variable-slope-model | ||||
Intercept |
−10.236±6.425 |
0.111 |
−0.512±0.500 |
0.305 |
Latitude |
0.354±0.165 |
0.032 |
0.014±0.013 |
0.277 |
α_{3} |
0.469±0.262 |
0.073 |
1.533±0.673 |
0.023 |
Latitude ×α_{3} |
−0.003±0.007 |
0.646 |
−0.019±0.017 |
0.284 |
Log likelihood: −48.841 AIC: 22.54 |
Log likelihood: −192.691 AIC: −44.58 | |||
Variable-level-model | ||||
Intercept |
−7.544±2.655 |
0.004 |
0.015±0.092 |
0.874 |
Latitude |
0.283±0.058 |
0.000 |
0.000±0.002 |
0.857 |
α_{3}-diversity |
0.350±0.034 |
0.000 |
0.815±0.065 |
0.000 |
Log likelihood: −48.946 AIC: 20.75 |
Log likelihood: −192.702 AIC:−46.58 | |||
Invariant model | ||||
Intercept |
4.908±0.974 |
0.000 |
0.029±0.046 |
0.532 |
α_{3}-diversity |
0.268±0.039 |
0.000 |
0.813±0.064 |
0.000 |
Log likelihood: −57.704 AIC: 36.27 |
Log likelihood: −192.717 AIC: −48.15 |