Table 2.

The effect of varying model parameters on the fitted relationships among body size, mean population density, and variance in population density

Parameter and range	Mean: body size (1)	Variance: body size (2)	Variance: mean (3)
Diet breadth σ [1.3, 1.65]
Exponent	[−0.7, −0.6]	[−1.4, −1.2]	[1.7, 2]
Intercept	[−7, −4]	[−∞,−10]	[−∞, 2]
r2	[0.73, 0.89]	[0.76, 0.91]	[0.98, 1.00]
Preferred predator-to-prey mass ratio β [4, 6]
Exponent	[−0.8, −0.5]	[−1.4, −1.1]	[1.6, 2.1]
Intercept	[−7, −4]	[−∞,−9]	[−∞, 3]
r2	[0.79, 0.90]	[0.81, 0.89]	[0.97, 1.00]
Maturation midpoint xm [10.5, 13]
Exponent	[−0.8, −0.5]	[−1.4, −1.2]	[1.7, 1.9]
Intercept	[−5, −4]	[−∞,−10]	[−∞,−2]
r2	[0.85, 0.98]	[0.85, 0.92]	[0.98, 1.00]
Maximum plankton size xp [0, 3]
Exponent	[−0.8, −0.6]	[−1.3, −1.2]	[1.6, 1.8]
Intercept	[−5, −3]	[−∞, −9]	[−∞,−2]
r2	[0.88, 0.98]	[0.88, 0.97]	[0.96, 1.00]
Plankton spectrum exponent −γ [−2.2, −1.5]
Exponent	[−0.8, −0.6]	[−1.4, −1.2]	[1.7, 1.8]
Intercept	[−6, −4]	[−14, −9]	[−4, −2]
r2	[0.86, 0.90]	[0.86, 0.88]	[0.99, 1.00]

Lower bounds of −∞ for intercepts indicate that the variance tended to zero within the investigated parameter range.