circular: turtles – R documentation

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turtles

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])

circular

Circular Statistics

v0.4-93

GPL-2

Authors

Ulric Lund <ulund@calpoly.edu> [aut], Claudio Agostinelli <claudio.agostinelli@unitn.it> [aut, cre], Hiroyoshi Arai <h_arai@aoni.waseda.jp> [ctb], Alessando Gagliardi <gagliardi@stud.unive.it> [ctb], Eduardo Garcia Portugues <edgarcia@est-econ.uc3m.es> [ctb], Dimitri Giunchi <dimitri.giunchi@unipi.it> [ctb], Jean-Olivier Irisson <irisson@normalesup.org> [ctb], Matthew Pocernich <pocernic@ucar.edu> [ctb], Federico Rotolo [ctb]

Initial release

2017-06-26