“…The catchments included in this volume are located in a wide variety of environments, including high elevation (Holko et al, 2018;Zuecco et al, 2018), pre-alpine (van Meerveld et al, 2018, and sub-Mediterranean (Lana-Renault et al, 2018;Llorens et al 2018) mountain areas; in rural landscapes under both humid (Gascuel-Odoux et al, 2018) and Mediterranean (Schnabel et al, 2018) conditions; and in environments in transition between arid and semiarid climate conditions (Rodríguez-Caballero et al, 2018). Most of the contributions focus on understanding of runoff generation mechanisms in the studied environments, using various types of data (hydrometric data, isotopes, stream chemistry) and approaches (analysis of thresholds, hysteresis, hydrological connectivity, controlling factors, and hydrological modeling).…”