spottedWoodpecker {AHMbook}R Documentation

Data for observations of Middle Spotted Woodpecker in Switzerland

Description

The data set is based on checklists which volunteers submit from their bird-watching trips and which were then summarized by day and site (1 km2 quadrat) such that we have the number of surveys (= checklists) per quadrat and day, and the number among these on which a Middle-Spotted Woodpecker was recorded, during 162 days (Julian days 51–212, corresponding to 20 February–31 July). There are data from a total of 144,517 recorded surveys on 116,204 day/quadrat combinations during 26 years from 1545 1 km2 quadrats in which the species was ever recorded in Switzerland since 1985.

Usage

data("spottedWoodpecker")

Format

spottedWoodpecker is a data frame with 116,204 rows and 7 columns:

site

quadrat identifier.

coordx, coordy

the x and y coordinates of the center of the quadrat; the coordinate reference system intentionally not specified.

year, jdate

the year and Julian date of the observations.

y

the number of surveys during which the species was detected.

nsurveys

the number of recorded surveys in the quadrat on that day.

Source

Database of Swiss Ornithological Institute (courtesy of Nicolas Strebel).

References

Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 4.11.2.

Examples

data(spottedWoodpecker)
str(spottedWoodpecker)

[Package AHMbook version 0.2.3 Index]