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CHAPTER 5. METAPOPULATION
5.2.1
Stabilizing selection
Stabilizing selection may act on the phenotype (P ) of quantitative traits. The
selection pressure is defined by the parameters patch stab sel optima (ZOpt ) and
patch stab sel intensity (ω). The fitness (W ) of a quantitative trait is computed
using the following standard Gaussian function for stabilizing selection:
(P −ZOpt )
−
2ω 2
!
0.8
1.0
W =e
2
0.2
0.4
fitness
0.6
ω
0.0
ZOpt
−4
−2
0
2
4
phenotype
patch stab sel optima
patch stab sel optima fem
patch stab sel optima mal [decimal/matrix] (temporal/default: 0)
These parameters allow to set the selection optimum zOpt for each patch and
quantitative trait.
patch stab sel intensity
patch stab sel intensity fem
patch stab sel intensity mal [decimal/matrix] (temporal/default: 1)
These parameters allow to set the selection intensity ω for each patch and
quantitative trait. A small value results in a strong selection pressure, whereas
a large value results in a weak selection pressure.