Fig. 1 The western Southern Alps, New Zealand. The western Southern Alps, New Zealand. (A) Watersheds for the central part of the study area where glacier area varies most, with watershed boundaries marked in white. The black line is the Alpine Fault trace. Image is from Landsat ETM (Enhanced Thematic Mapper) (31 December 2002), shown to illustrate glacial coverage. The watershed-averaged dissolved Re concentration, [Re]diss (pmol liter−1), is shown as the circle size, and the shading reflects the percentage watershed area with glaciers (23). Inset shows the location of the study area on South Island, New Zealand. (B) Positive relationship between watershed-averaged [Re]diss and the percentage of the watershed area covered by glaciers (n = 13, r = 0.93, r2 = 0.87, P < 0.001). Gray whiskers are ±2 SE on the mean [Re]diss values. Kate Horan et al. Sci Adv 2017;3:e1701107 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).