TABLE 3.
Symbol | Value | Units | Parameter |
---|---|---|---|
Individual growth | |||
M | Variable | g | Asymptotic size |
η | 0.25 | – | Ratio between M and m* |
m* | ηM | g | Maturation size |
f 0 | 0.5 | – | Initial feeding level |
γ | 538 | g−q m3 year−1 | Factor for search volume |
α | 0.6 | – | Assimilation efficiency |
h | 85 | g1− n year−1 | Maximum food intake |
n | 0.75 | – | Exponent for max. food intake |
p | 0.75 | – | Exponent for standard metabolism |
ks | 4 | – | Factor for standard metabolism |
β | 100 | – | Preferred predator‐prey mass ratio |
σ | 1 | – | Width of the feeding kernel |
q | 0.8 | – | Exponent of search volume |
Reproduction | |||
m 0 | 0.1 | mg | Offspring mass |
ε | 1 | – | Efficiency of offspring production |
u | 7 | – | Width of maturation transition |
Mortality | |||
ξ | 0.1 | – | Fraction of energy reserves |
μ 0 | 2 | g1‐ n year−1 | Background mortality |
se max | 1 | g1‐ n year−1 | Upper limit for senescence mortality |
se min | 0.1 | g1‐ n year−1 | Lower limit for senescence mortality |
str | 0.1 | year−1 | Starvation mortality cost |
θ | Variable | – | Interaction matrix species‐specific value |
Resource spectrum | |||
κ | 0.05 | gλ−1 m−3 | Magnitude of resource spectrum |
λ | 2 − n + q | – | Slope of resource spectrum |
r 0 | 4 | g1‐p year−1 | Regeneration rate of resources |
m cut | 1 | g | Upper limit of resources spectrum |
Evolution | |||
χ | 0.001 | – | Phenotype's introduction probability |
Ω | 10−30 | Individual/m3 | Extinction threshold |
5% | – | Fraction of initial phenotype's abundance | |
+−20% | – | Magnitude of trait evolution |
M is noted "variable" as it is species specific (values in Table 1). η starts at 0.25 for all species but will evolve during the simulations. Parameters values are taken from Hartvig et al. (2011). The value from γ was calculated from: (Hartvig et al., 2011). Initial values for the abundance density N(m) of each species at t = 0 were based on the equilibrium equation: provided in Andersen and Beyer (2006).