Intermittent rivers and ephemeral streams are the world's dominant river ecosystem, yet monitoring and management typically focus on rivers that flow year round. Writing in BioScience, Amélie Truchy of the French National Research Institute for Agriculture, Food, and the Environment (INRAE) and colleagues describe the problem, as well as a potential solution: citizen science.
The authors discuss the results from a new app, DRYRivERS, which allows scientist and nonscientist users alike to record data on ephemeral streams and intermittent rivers. The data are then made available to various experts. Over a one-year period, the authors recorded "3600 observations from more than 1900 river reaches across 19 countries and four continents." Such data are essential for managers and ecologists, say the authors, because current "monitoring schemes, approaches, and tools are designed for perennial rivers, rarely reflecting the prevalence of intermittent rivers and ephemeral streams or their hydrological characteristics and biological communities."
The authors share three case studies, highlighting the potential for DRYRivERS and similar apps to inform river regulation, aid the mapping of ephemeral waterways, and assist in the modeling of hydrological states—such as the drying of rivers in the face of climate change. In addition to helping managers and researchers, say the authors, the benefits of community monitoring may accrue among the citizen scientists, themselves. Such efforts are "an excellent way of raising people's awareness" and helping them reconnect with rivers and streams "by emphasizing the importance of the water resources and any resulting restrictions that the authorities may implement in response to more frequent or more dramatic drying."
Over the longer term, Truchy and colleagues anticipate even greater benefits from consolidating traditional ecological and citizen science data in the form of a universal waterways map with broad applications. They envision that such a resource that could ultimately become "the cornerstone of future, harmonized water management strategies that are not limited to specific types of rivers or constrained by administrative boundaries."
