popbio (version 2.4.4)

woodpecker: Survirvorship data for adult and juvenile Acorn Woodpeckers

Description

Number of juvenile and adult Acorn Woodpeckers and survival in the Water Canyon, New Mexico population, reconstructed from Stacey and Taper (1992).

Usage

data(woodpecker)

Format

A data frame with 18 observations on the following 4 variables.

rate

Adult or juvenile stage

year

Year

start

Total number of starting individuals

surv

Number surviving to spring

References

Akcakaya, H. R. 2002. Estimating the variance of survival rates and fecundities. Animal Conservation 5: 333-336.

Kendall, B. E. 1998. Estimating the magnitude of environmental stochasticity in survivorship data. Ecological Applications 8(1): 184-193.

See Also

Kendall and varEst

Examples

# NOT RUN {
data(woodpecker)
woodpecker
with(subset(woodpecker, rate=='adult'), 
 plot(year, start, type='o', pch=16, 
 ylab="Number of adults", xlab="Year",
 main="Acorn Woodpeckers in Water Canyon"))
##stage-specific survival rate
x<-aggregate(list(Nstart=woodpecker$start, Nsurv=woodpecker$surv),
list(stage=woodpecker$rate), sum)
x$survival<-x[,3]/x[,2]
x
# }