1. Department of Environmental Hydrology & Microbiology, Zuckerberg Institute for Water Research, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer 84990, Israel, Mitrani Department of Dryland Ecology, Swiss Institute for Dryland Environmental Research, J. Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer 84990, Israel, and Faculty of Civil and Environmental Engineering, Technion, Haifa 32000, Israel