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Inland waters under threat

Inland aquatic systems connect headwater systems of streams and ponds to rivers and lakes downstream, transporting sediment, nutrients, biota and contaminants. In this web focus, we present a collection of articles and opinion pieces from Nature Geoscience about inland aquatic systems; the hydrological, chemical and biological functions they provide to ecosystems; their influence on biogeochemical cycles and the threats they face due to human demands and climate change.