R: Arrival directions of displaced sea turtles

turtles {circular} | R Documentation

## Arrival directions of displaced sea turtles

### Description

The _turtles_ dataset has 10 rows and 2 columns. The observations are the directions from which 10 green sea turtles approached their nesting island (Ascension Island, South Atlantic Ocean) after having been displaced to open-sea sites.

### Usage

    data(turtles)

### Format

A data frame with 10 observations on the following 2 variables.

`id`

  a numeric vector: the turtle ID

`arrival`

  a numeric vector: the direction of arrival to Ascension Island

### Source

Luschi, P., Akesson, S., Broderick, A. C., Glen, F., Godley, B. J., Papi F., and Hays, G. C. (2001) Testing the navigational abilities of ocean migrants: displacement experiments on green sea turtles (_Chelonia mydas_). Behav. Ecol. Sociobiol. (50):528-534.

### Examples

    data(turtles)
    turtles[,2] <- circular(turtles[,2], units='degrees', template='geographics')
    plot(turtles[,2])

[Package circular version 0.4-93 Index]