Rivers and lake ecosystems are affected by changing hydro-logic conditions (e.g., due to melting mountain glaciers) as well as by increasing temperatures. For many lakes, this may imply reductions in oxygen concentrations and subsequent changes in species composition and water quality. In northern lakes and rivers, productivity may increase. Wetlands are affected by local to regional changes in water levels, in the case of warming implying the risk of drier conditions and loss of peat. Many Arctic lakes are at risk to dry out, with negative consequences for many species (fish, birds, etc.).
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