growth_soVB: seasonally oscillating von Bertalanffy growth function

In marchtaylor/fishdynr: Fisheries science related population dynamics models

Description

growth_soVB describes the growth as a function of age (t) using the seasonally oscillating von Bertalanffy growth function (Somers 1988).

Usage

growth_soVB(Linf, K, t, t0, ts, C)

Arguments

Linf	Infinite length
K	growth constant
t	age
t0	(hypothetical) age at length zero
ts	summer point. Time of year (between 0 and 1) when growth oscillation cycle begins (sine wave term becomes positive). Note that this definition differs from some interpretations of the model (see Somers 1998)
C	oscillation strength. Varies between 0 and 1.

References

Somers, I. F. (1988). On a seasonally oscillating growth function. Fishbyte, 6(1), 8-11.

Examples

t <- seq(0,5,0.1)
L <- growth_soVB(Linf=100, K=0.5, t=t, t0=-0.2, ts=0.5, C=0.75)
plot(t, L, t="l")

marchtaylor/fishdynr documentation built on May 21, 2019, 11:27 a.m.