Appendix C. Details of rock-scale model fits.
TABLE C1. Parameter estimates, residual sum of squares, maximum-likelihood estimate of variance, negative log likelihood, number of estimated parameters (including the variance), and Akaike information criterion for fits of rock-scale models.
Model
Parameter estimates
r.s.s.
L
p
AIC
Models for periphyton growth
Resource gradient
P0 = 0.236/d,
= 2.23×10-3 µg-1·cm2,
m = 0.111/d15.63
0.391
37.96
4
83.92
Logistic
r = 0.0981/d,
K = 782.6 µg/cm215.70
0.392
38.05
3
82.10
Exponential growth
r = 0.0347/d
32.85
0.821
52.82
2
109.63
Constant accumulation
= 14.52 µg·cm-2·d-1
18.93
0.473
41.80
2
87.60
Models for removal rate of periphyton by grazers
Type III
b = 1.00×10-5 µg-2·cm4·d -1,
h = 0.912/d7.409
0.412
17.55
3
41.10
Type II
a = 1.41×10-3 µg-1·cm2·d-1,
h = 0.00×10-7/d8.466
0.470
18.75
3
43.50
Linear increase
a = 1.41×10-3 µg-1·cm2·d -1
8.466
0.470
18.75
2
41.50
Saturated
c = 0.116 µg·cm -2·d-1
14.253
0.792
23.44
2
50.88