wagtail {AHMbook}R Documentation

Data for Dutch wagtails

Description

The Dutch Centre for Field Ornithology (Sovon) monitored grassland birds in Flevoland between April and mid-July 2011. 235 points were surveyed on up to 4 occasions; observations were divided into distance classes 50m wide, and the number of observations in each class recorded. These data are for the Yellow Wagtail (Motacilla flava).

Usage

data("wagtail")

Format

wagtail is a list with 8 elements:

potato

for each point, the percentage of the area which are potato fields.

grass

for each point, the percentage of the area under permanent grassland.

lscale

for each point, an index of whether the landscape is open (0) or closed (100).

date

a points x occasions matrix, the Julian date of the survey.

hour

a points x occasions matrix, the hour of the survey.

breaks

the boundaries between the distance classes; birds more than 300m from the point were not included.

Y

a matrix of counts, with a row for each site; columns 1 to 6 give the counts in the distance classes for the 1st survey occasion, columns 7 to 12 for the 2nd occasion, and so on (this is the format required for unmarkedFrameGDS).

rep

a points x occasions character matrix with the occasion number (this is used as a categorical variable in the analysis).

Source

Dutch Centre for Field Ornithology (SOVON)

References

Kéry, M. & Royle, J.A. (2016) Applied Hierarchical Modeling in Ecology AHM1 - 9.5.3.

Examples

data(wagtail)
str(wagtail)

[Package AHMbook version 0.2.3 Index]