Rising temperatures in rivers affect aquatic life
Aquatic species all have a preferred temperature range in which they live, and when this range is affected, this can cause the death of species that cannot live in warmer waters. Moreover, a rise in water temperature also affects water chemistry.
Groundwater, for example, can have a higher electrical conductivity as the higher water temperature dissolves more minerals from the surrounding rocks. Warm water holds less dissolved oxygen than cold water, which means there is ultimately less oxygen for aquatic life. Certain water compounds also become more toxic once temperatures rise.
Let’s take trout or salmon, for example. These fish are cold-water species and therefore require cold water for their very survival. If our river temperatures keep rising, these fish will be replaced by species able to live in warmer waters and trout and salmon meals will become a thing of the past.