getfecmax: Calculate maximum theoretical fecundity rate

In ktmurray1219/mmrefpoints: Project Marine Mammal Populations and Calculate Reference Points

Description

Calculate maximum theoretical fecundity rate fmax

Usage

getfecmax(S0, lambdaMax, S1plus, AgeMat)

Arguments

S0	calf/pup survival, a numeric value between 0 and 1
lambdaMax	maximum population growth rate (must exceed 0; default value is 1.04 for cetaceans and 1.12 for pinnipeds)
S1plus	survival of age 1+ individuals, a numeric value between 0 and 1
AgeMat	age at maturity in years (must be equal to or less than nages)

Details

Parts of this derivation can be found in Breiwick et al. (1984) and Butterworth and Punt (1992). Important: when applying this calculation, use age at maturity ( AgeMat )

Value

a numeric value for maximum theoretical fecundity.

Examples

x <- getfecmax(lambdaMax = 1.04, S0 = 0.944, S1plus = 0.99, AgeMat = 17)
unpr <- npr(S0 = 0.944, S1plus = 0.99, AgeMat = 17, nages = 10000, E = 0)
print(1 / unpr$npr)

ktmurray1219/mmrefpoints documentation built on Dec. 21, 2021, 8:40 a.m.