eq08_Bmd: Equation 8: Assigning breeding males to "drain" (aka...

In brouwern/FACavian: An R implementation and extension of full-annual cycle (FAC) model of Runge & Marra *2005)

Equation 8: Assigning breeding males to "drain" (aka "floater") status

Description

Males that don't find a territory AND don't find a mate become "drain" males (floaters). W2.mg+W2.mp = total male population at the end of spring migration. From thid gets subtracted birds that ended up in source habitat (K.bc) and those that paired with female in sink habitat (B.fk)

Usage

eq08_Bmd(W2, K.bc, B.fk)

Arguments

W2	population vector
K.bc	source carrying capacity
B.fk	females available in sink

Details

Note that it is possible for the equation W2.mg+W2.mp - K.b to return a negative value if the number of males is less than the source habitat size (K.bc). The use of max() corrects for this.

Value

Number of males in drain habitat.

References

Runge, MC and PP Marra. 2004. Modeling seasonal interactions in the population dynamics of migratory birds. In Greenberg, R and PP Marra, eds. Birds of Two Worlds.

Examples

W2. <- c(10,10,10,10)
names(W2.) <- c("mg","fg","mp","fp")
eq08_Bmd(W2 = W2., K.bc = 0, B.fk =5)

brouwern/FACavian documentation built on June 1, 2024, 10:32 p.m.