Table 2.

Models of fitness based on different hypothetical relationships between investment in a secondary sexual trait and mating success

f(γ)	E	b	W
Power
Linear: n = 1 Decelerating power: 0 < n < 1 Accelerating power: n > 1	${(qT)}^p$	${((1-q)T)}^n+s$	${(qT)}^p\ast ({((1-q)T)}^n+s)$
Logistic	${(qT)}^p$	$\frac{x}{1+e^{-y((1-q)T-z)}}+s$	${(qT)}^p\ast (\frac{x}{1+e^{-y((1-q)T-z)}}+s)$
Tan	${(qT)}^p$	$\frac{\tan (m((1-q)T))}{r}+s$	${(qT)}^p\ast (\frac{tan(m((1-q)T))}{r})+s$