woodpecker {popbio}R Documentation

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

Source

Stacey, P.B., and M. Taper. 1992. Environmentl variation and the persistence of small populations. Ecological Applications 2: 18-29.

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

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

[Package popbio version 1.1.11 Index]