wiqid (version 0.3.3)

MeadowVoles: Robust design mark-recapture data for meadow voles

Description

Data for adult male meadow voles Microtus pennsylvanicus from a live-trapping study at Patuxent Wildlife Research Center (Nichols et al 1984). Trapping was carried out for 5 consecutive nights each month for 6 months (June to December 1981).

Usage

data(MeadowVoles)

Format

A data frame with 171 observations on the following 31 variables.

A1, A2, A3, A4, A5, B1, B2, B3, B4, B5, C1, C2, C3, C4, C5, D1, D2, D3, D4, D5, E1, E2, E3, E4, E5, F1, F2, F3, F4, F5

a 1/0 array of capture data for voles for each of 5 occasions per month for 6 months.

freq

a column with -1/1, where -1 indicates that the animal was not released after the last recorded capture.

Details

The data are provided as a data frame, such as would result from reading in data from a text file. Further formatting is needed before using these for analysis: see the examples.

References

Nichols, Pollock, Hines (1984) The use of a robust capture-recapture design in small mammal population studies: A field example with Microtus pennsylvanicus. Acta Theriologica 29:357-365.

Examples

data(MeadowVoles)

# Extract detection histories:
DH <- MeadowVoles[, 1:30]
freq <- MeadowVoles$freq

survRD(DH, freq=freq, occsPerSeason=5)