SIMM results.

<p>SIMM results.</p

Prey species SI values.

<p>Prey species SI values.</p

Mixing model polygon results.

<p>Stable isotope mixing model polygons for gray seal vibrissae (a,b,c) and lanugo (d,e,f) relative to six potential prey species groups. Black dots: consumer SI signatures. White crosses: average source SI signatures adjusted for TEF values. Colored region represents the 95% confidence interval. Probability contours are at the 5% level. TEF values derived from a,d) Post[<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192241#pone.0192241.ref047" target="_blank">47</a>], b,e) SIDER; c,f) Experimentally derived [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192241#pone.0192241.ref048" target="_blank">48</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192241#pone.0192241.ref026" target="_blank">26</a>,<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192241#pone.0192241.ref027" target="_blank">27</a>].</p

δ¹⁵N and δ¹³C bi-plots of gray seal and prey SI values adjusted for Post [47] TEFs.

<p>δ¹³C and δ¹⁵N stable isotope values of gray seal pup vibrissae (a,c) and lanugo (b,d) tissues relative six (a,b) and three (c,d) prey source groupings. Prey source are presented as mean±SD and adjusted for Post [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0192241#pone.0192241.ref047" target="_blank">47</a>] TEFs.</p

Vibrissae and lanugo SI values.

<p>Vibrissae and lanugo SI values.</p

GPS_Coordinates_Colonies

This file contains the GPS coordinates (Longitude West and Latitude South) and UTM coordinates for the 14 colonies where samples were obtained