datasets (version 3.3.3)

beavers: Body Temperature Series of Two Beavers

Description

Reynolds (1994) describes a small part of a study of the long-term temperature dynamics of beaver Castor canadensis in north-central Wisconsin. Body temperature was measured by telemetry every 10 minutes for four females, but data from a one period of less than a day for each of two animals is used there.

Usage

beaver1
beaver2

Format

The beaver1 data frame has 114 rows and 4 columns on body temperature measurements at 10 minute intervals. The beaver2 data frame has 100 rows and 4 columns on body temperature measurements at 10 minute intervals. The variables are as follows:

day

Day of observation (in days since the beginning of 1990), December 12--13 (beaver1) and November 3--4 (beaver2).

time

Time of observation, in the form 0330 for 3:30am

temp

Measured body temperature in degrees Celsius.

activ

Indicator of activity outside the retreat.

Examples

require(graphics)
(yl <- range(beaver1$temp, beaver2$temp))

beaver.plot <- function(bdat, ...) {
  nam <- deparse(substitute(bdat))
  with(bdat, {
    # Hours since start of day:
    hours <- time %/% 100 + 24*(day - day[1]) + (time %% 100)/60
    plot (hours, temp, type = "l", ...,
          main = paste(nam, "body temperature"))
    abline(h = 37.5, col = "gray", lty = 2)
    is.act <- activ == 1
    points(hours[is.act], temp[is.act], col = 2, cex = .8)
  })
}
op <- par(mfrow = c(2, 1), mar = c(3, 3, 4, 2), mgp = 0.9 * 2:0)
 beaver.plot(beaver1, ylim = yl)
 beaver.plot(beaver2, ylim = yl)
par(op)