Data and R-script to analyse timing of northward migration of Sanderlings (Calidris alba) through Europe

<p>The data file contains data of observations of individual Sanderlings (<em>Calidris alba</em>) from specific wintering areas observed during migration in different latitude sectors through Europe. This is a subset of the raw data file which also includes observations at the wintering grounds. Each individual is indicated with a unique number in column &ldquo;Individual&rdquo;. The column &ldquo;Winter Area&rdquo; indicates the winter location of each individual in sectors of 5 degrees latitude (as depicted in Fig. 1 in the manuscript), with 7 indicating Scotland, 8 England, 9 France, 10 North Iberia, 11 Portugal, 13 Canary Islands, 15 Mauritania, 18 Ghana and 23 Namibia, as indicated in the column &ldquo;Winter_Country&rdquo;. &nbsp;&ldquo;Date_DOY&rdquo; indicates the day of year on which current observation was made. &ldquo;Year&rdquo; indicates the year during which an observation was made, &ldquo;lat&rdquo; is the latitude and &ldquo;lon&rdquo; the longitude of each observation in decimal degrees. &ldquo;Lat_Sector&rdquo; specifies in which of the sectors of 6 latitudinal degrees in Europe &nbsp;(see Fig. S1) the observation was made. &ldquo;Sex&rdquo; indicates the sex, based on molecular methods of an individual where 0=unknown, 1=female, 2=male. &ldquo;Age&rdquo;is the age of an individual, where 50=juvenile (i.e. less than 1 year old), 99=adult (i.e more than 1 year old) and 0 indicates that the age was unknown. &ldquo;migration&rdquo; indicates whether an observed individual is conisdered to be on migration (&ldquo;yes&rdquo; i.e. seen at least 2 latitudinal degrees north of its average winter location) or not (&ldquo;no&rdquo;). Further details can be found in the methods section in the manuscript.</p> <p>The R-script uses this dataset to analyse the variation in timing of migration through Europe for individual Sanderlings from different non-breeding areas. Comments and explanations can also be found in the script and in the methods section of the manuscript.</p> <p>&nbsp;</p>