Supplement 1. Raster format of loggerhead δ13C and δ15N isoscapes and associated standard deviation.

<h2>File List</h2><div> <p><a href="loggerhead_d13C_isoscape.txt">loggerhead_d13C_isoscape.txt</a> (md5: 75d5be745e2018c1fbf639224e598736)</p> <p><a href="loggerhead_d15N_isoscape.txt">loggerhead_d15N_isoscape.txt</a> (md5: d76570667098245e4102e8380b588324)</p> <p><a href="loggerhead_d13C_error.txt">loggerhead_d13C_error.txt</a> (md5: 7f8bb3cc91d34eb8ad033942bd2f93cf)</p> <p><a href="loggerhead_d15N_error.txt">loggerhead_d15N_error.txt</a> (md5:995ce245c4e066001d6f8322e33038ef )</p> </div><h2>Description</h2><div> <p>loggerhead_d13C_isoscape.txt – krigged surface of <i>δ</i><sup>13</sup>C values from 41 calibration loggerhead sea turtles in coastal waters < 200m depth of the Gulf of Mexico and Greater Caribbean</p> <p>loggerhead_d15N_isoscape.txt – krigged surface of <i>δ</i><sup>15</sup>N values from 41 calibration loggerhead sea turtles in coastal waters < 200m depth of the Gulf of Mexico and Greater Caribbean</p> <p>loggerhead_d13C_error.txt – standard deviation of the kriging prediction of<i>δ</i><sup>13</sup>C values</p> <p>loggerhead_d15N_error.txt – standard deviation of the kriging prediction of<i>δ</i><sup>15</sup>N values</p> <p>These four files are the<i>δ</i><sup>13</sup>C and<i>δ</i><sup>15</sup>N isoscapes and standard deviation rasters that are depicted in Fig. 1 of the main text. They are ASCII-formatted text files and contain a header to identify the structure of the file. They can be opened in ArcGIS by using the ASCII to Raster conversion tool or in R with the raster() function using the Raster package and then assigned a spatial reference within the program used. Resolution of each of the files is 0.0572 degrees.</p> </div>