AUTHOR=Beyer Matthias , Penna Daniele TITLE=On the Spatio-Temporal Under-Representation of Isotopic Data in Ecohydrological Studies JOURNAL=Frontiers in Water VOLUME=3 YEAR=2021 URL=https://www.frontiersin.org/journals/water/articles/10.3389/frwa.2021.643013 DOI=10.3389/frwa.2021.643013 ISSN=2624-9375