This section covers an eclectic mix of freshwater habitats ranging from streams and rivers, to ponds, pools and lakes, and then to fens and swamps. All of these habitats, and the species associated with them, are particularly vulnerable to changes relating to pollution incidents and climate change. Changes in the periodicity of inundation, influenced by the changing seasonality and levels of precipitation, can have a dramatic impact on the biodiversity of the habitats. These are outlined in the respective sections below.