unmarked: issj – R documentation

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issj

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

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)

unmarked

Models for Data from Unmarked Animals

v1.1.0

GPL (>= 3)

Authors

Richard Chandler [aut], Ken Kellner [aut], Ian Fiske [aut], David Miller [aut], Andy Royle [cre, aut], Jeff Hostetler [aut], Rebecca Hutchinson [aut], Adam Smith [aut], Marc Kery [ctb], Mike Meredith [ctb], Auriel Fournier [ctb], Ariel Muldoon [ctb], Chris Baker [ctb]

Initial release

2021-05-05