Location map of study sites.

<p>Location map for Ellesmere Island, Nunavut, Canada (A), with Ellesmere Island in detail highlighting the three study regions: Cape Herschel, Pim Island, and Sverdrup Pass (B), and higher resolution insets of Cape Herschel (C), Pim Island (D), and Sverdrup Pass (E) identifying the 10 lakes and ponds in this study with “warm” sites as red circles, “cool” sites as green circles, “cold” sites as dark blue circles, and “oasis” sites in orange. Major hydrological features are shown in light blue, glaciers in dark grey and 20 m topographic contours as light grey lines. Source: Natural Resources Canada [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172989#pone.0172989.ref028" target="_blank">28</a>].