Blossom (version 1.4)

npof: Orientation of movements of newt

Description

An analysis of the orientation of movements of striped newts Notophtalmus peristriatus immigrating to and emigrating from Breezeway Pond, Florida in 1985 - 1990 (Dodd and Cade 1998) including the angular orientation of 585 females immigrating to and 564 emigrating from the pond that were captured in pitfall buckets inside and outside of a drift fence surrounding the pond.

Usage

data(npof)

Format

A data frame with 1149 observations on the following 2 variables.

angle

The angular orientation of each female newt.

ei

This grouping variable has 1's for emigrating and 2's for immigrating females.

Source

Dodd, C.K., and B.S. Cade. 1998. Movement patterns and the conservation of amphibians breeding in small, temporary wetlands. Conservation Biology 12, 331--339.

Examples

str(npof)
npof$ei <- factor(npof$ei,levels=c(1,2),labels=c("Immigrating","Emigrating"))
group.counts <- as.data.frame(table(npof))

par(mfrow = c(1,2),mar = c(8,0,6,0),pty = "s")
limit <- max(group.counts$Freq)

for(i in 1:2){
    freq <- group.counts$Freq[group.counts$ei==unique(group.counts$ei)[i]]
    plot(c(-(limit+14),limit+14),
         c(-(limit+14),limit+14),type = "n",xaxt = "n",
         yaxt = "n",xlab = "",ylab = "",main =(unique(group.counts$ei)[i]))
         
    symbols(x = 0,y = 0,circles = limit+6,col = "blue",inches = FALSE,
           add = TRUE,lwd = 1.5)        
    angl <- as.numeric(as.character(
            group.counts$angle[group.counts$ei==unique(group.counts$ei)[i]]))
    segments(x0 = rep(0,times = 24),y0 = rep(0,times = 24),
         x1 = c(sin(angl*pi/180)*freq,0),y1 = c(cos(angl*pi/180)*freq,limit+4),
         col = c(rep("blue",times = 23),"black"),
         lwd = c(rep(2,times=23),1.5))
    text(x = c(limit+12,0,-limit-12,0),
         y = c(0,limit+12,0,-limit-10),labels = c("90","0","270","180"))
    text(x = rep(-7,times = 6),y = seq(from = 10,to = 70,by = 10),
        labels = seq(from = 10,to = 70,by = 10))
    segments(x0 = rep(-2,times = 6),y0 = seq(from = 10,to = 70,by = 10),
        x1 = rep(0,times = 6),y1 = seq(from = 10,to = 70,by = 10))                         
}

dev.off()