| 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)