AHMbook (version 0.2.9)

SwissSquirrels: Data for Red Squirrels in Switzerland from the Swiss breeding bird survey MHB

Description

A file with detection/nondetection data for the Red Squirrel (Sciurus vulgaris) in 265 1 km2 survey quadrats in Switzerland for 2007, together with covariates (data for the two remaining among the total of 267 quadrats in that monitoring program were not available). See Examples for code to load the data.

Format

The file SwissSquirrels.txt is a tab-delimited text file with 265 rows and the following columns:

• spec.name : the species name.

• coordx : the x coordinate of the center of the quadrat; the coordinate reference system intentionally not specified.

• coordy : the y coordinate of the center of the quadrat.

• ele : the mean elevation of the quadrat, m.

• route : the length of the route walked in the quadrat, km.

• forest : percentage forest cover.

• det071, det072, det073 : 1/0 detection data for 3 survey occasions in 2007.

• date071, date072, date073 : Julian date for the 3 survey occasions (1 = 1st April).

• dur071, dur072, dur073 : duration of the 3 survey occasions (mins).

References

Kéry, M. & Royle, J.A. (2016) Applied Hierarchical Modeling in Ecology AHM1 - 10.9.

Examples

# To read in the text file
fn <- file.path(find.package("AHMbook"), "extdata", "SwissSquirrels.txt")
data <- read.table(fn, header = TRUE)
str(data)