popbio (version 1.0.1)

tortoise: T and F matrices for desert tortoise

Description

Transition matrix and fertility estimates for the desert tortoise Gopherus agassizii

Usage

data(tortoise)

format

A list of 1 average transition matrix (T) and 4 fertility matrix estimates (low, medium low, medium high, and high)

source

Table 5 in Doak et al (1994). Used by Caswell (2001) in chapter 9 on sensistivity analsysis.

References

Caswell, H. 2001. Matrix population models: construction, analysis, and interpretation, Second edition. Sinauer, Sunderland, Massachusetts, USA.

Doak, D., P. Kareiva, and B. Kleptetka. 1994. Modeling population viability for the desert tortoise in the Western Mojave Desert. Ecological Applications 4:446-460.

Examples

data(tortoise)
A<-tortoise$T + tortoise$F.med.high

Re(eigen(A)$values[1])


y<-numeric(4)
for (i in 2:5)
{
A<-tortoise$T+tortoise[[i]]
y[i-1]<-Re(eigen(A)$values[1])
}
data.frame(row.names=names(tortoise)[2:5], lambda=y)