tortoise {popbio} | R Documentation |
Transition matrix and fertility estimates for the desert tortoise Gopherus agassizii
data(tortoise)
A list of 1 average transition matrix (T) and 4 fertility matrix estimates (low, medium low, medium high, and high)
Table 5 in Doak et al (1994). Used by Caswell (2001) in chapter 9 on sensistivity analsysis.
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.
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)