issj {unmarked} | R Documentation |
Distance-sampling data for the Island Scrub Jay (Aphelocoma insularis)
Description
Data were collected at 307 survey locations ("point transects") on Santa Cruz Island, California during the Fall of 2008. The distance data are binned into 3 distance intervals [0-100], (100-200], and (200-300]. The coordinates of the survey locations as well as 3 habitat covariates are also included.
Usage
data(issj)
Format
A data frame with 307 observations on the following 8 variables.
issj[0-100]
Number of individuals detected within 100m
issj(100-200]
Detections in the interval (100-200m]
issj(200-300]
Detections in the interval (200-300m]
x
Easting (meters)
y
Northing (meters)
elevation
Elevation in meters
forest
Forest cover
chaparral
Chaparral cover
References
Sillett, S. and Chandler, R.B. and Royle, J.A. and Kery, M. and Morrison, S.A. In Press. Hierarchical distance sampling models to estimate population size and habitat-specific abundance of an island endemic. Ecological Applications
See Also
Island-wide covariates are also available cruz
Examples
data(issj)
str(issj)
head(issj)
umf <- unmarkedFrameDS(y=as.matrix(issj[,1:3]), siteCovs=issj[,6:8],
dist.breaks=c(0,100,200,300), unitsIn="m", survey="point")
summary(umf)