About the cover

February 2016 Volume 9 No 2

Streamflow is a mixture of precipitation of various ages. Oxygen isotope data suggest that a third of global river discharge is sourced from rainfall within the past few months, which accounts for less than 0.1% of global groundwater. The image shows a reach of the Iris Burn River in Fiordland, New Zealand in February 2015.

Letter p126

IMAGE: GLENN JASECHKO

COVER DESIGN: ALEX WING

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