Freshwater wetlands are areas filled with surface or ground water such as ponds, swamps, bogs, and marshes. They are characterized by precipitation, temperatures, and a variety of biotic factors including bacteria, fungi, protists, plants, and animals. Abiotic factors like elevation, topography, wind speed, and soil composition also influence freshwater wetlands. Food webs in freshwater wetlands are driven by symbiotic relationships between organisms as they cycle carbon, nitrogen, phosphorus, and water. Drought can stress freshwater wetland ecosystems and cause harm to plants and animals with a loss of water.