SwissEagleOwls {AHMbook}R Documentation

Territory-level, multi-state detection/nondetection data for Eagle Owls in Switzerland

Description

Multi-state detection/nondetection data stem from more or less opportunistic surveys in a total of 274 territories of the Eurasian Eagle Owl (Bubo bubo), the largest owl in the world, between 2007 and 2016 (10 years). Sites are all over Switzerland and represent the complete list of sites where a territorial Eagle Owl was ever detected during this period. For site/year combinations with more than 20 observations, 20 were randomly selected for inclusion.

The data set recognizes four observed states: 'nondetection', 'detection of single bird', 'detection of a pair without breeding evidence' and 'detection of a pair with confirmed breeding'; these being the classical criteria of bird atlases for possible, probable or confirmed breeding. For the analysis in the book, the last two are aggregated into a single state 'Pair'.

Usage

data("SwissEagleOwls")

Format

SwissEagleOwls is a list with 2 elements:

obs

a data frame with a row for each of the 5974 observations and the following columns:

sites

a data frame with rows for 274 1x1km quadrats containing the sites, and the following columns:

Source

Swiss Ornithological Institute

References

Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 6.

Examples

data("SwissEagleOwls")
str(SwissEagleOwls)

[Package AHMbook version 0.2.3 Index]