How does climate affect the formation and maintenance of wetlands?

Climate is a primary driver in the formation and maintenance of wetlands, as it dictates the net balance between precipitation and evaporation. This balance determines the hydroperiod—the timing, duration, and quantity of water—which is essential for sustaining wetland ecosystems.1

The formation of these environments is heavily influenced by historical and current climate patterns. For instance, glacial retreat during the Pleistocene Epoch created landscapes that allowed for the development of many modern wetlands, while permafrost in cold regions creates an impermeable layer that sustains bogs and fens by preventing water drainage.2

Climate change currently poses significant risks to these ecosystems:
* Hydrological Shifts: Wetlands fed by surface water or snowmelt are vulnerable to drying in warmer, drier climates, while groundwater-fed systems may respond more slowly.3
* Carbon Dynamics: Warming can cause peatlands to decompose, potentially releasing stored carbon and methane into the atmosphere.3
* Sea Level Rise: Rising temperatures contribute to sea level rise, increasing inundation in coastal systems and forcing some wetlands to migrate inland where topography permits.3