willowWarbler {AHMbook}R Documentation

Constant effort site (CES) data for British Willow Warblers

Description

British Willow Warblers (Phylloscopus trochilus) caught at a total of 193 ringing (or banding) stations in England, Wales and Scotland. The willow warbler is a small (8–10 g) migratory species that used to be extremely widespread and common throughout Britain, but whose populations have suffered severe declines since the mid-90s. We analyse data from 11 years (1986–1996) before the major population decline.

Usage

data("willowWarbler")

Format

willowWarbler is a list with 4 elements:

birds

a data frame with rows for 10551 birds and the following columns:

  • 1986-1996 : capture history, 1 if the bird was captured that year, 0 otherwise.

  • cesID : numerical code for the Constant Effort Site where the bird was caught.

cells

a data frame with rows for 9667 5x5 km cells covering the whole of Britain, and the following columns:

  • lon, lat : easting and northing of the center of the cell.

  • gdd : mean growing degree days (GDD: the sum of daily mean temperatures above 5.5C).

  • blockID : the ID of the 25x25 km block into which the cell falls.

CES

a data frame with rows for each of the Constant Effort Sites, and the following columns:

  • cesx, cesy : approximate easting and northing of the site.

  • blockID : the ID of the 25x25 km block into which the site falls.

  • cellID : the ID of the 5x5 km cell into which the site falls.

blocks

a data frame with rows for 495 25x25 km blocks covering the whole of Britain, and the following columns:

  • blockX, blockY : easting and northing of the center of the block.

Source

British Ornithological Trust (BTO)

References

Kéry, M. & Royle, J.A. (2021) Applied Hierarchical Modeling in Ecology AHM2 - 3.4.

Examples

data(willowWarbler)
str(willowWarbler)
attach(willowWarbler)
ch <- as.matrix(birds[ , 1:11]) # extract capture histories.


[Package AHMbook version 0.2.3 Index]