There are several types of wetland ecosystems, including marshes, swamps, bogs, and fens. Each type of wetland has unique characteristics and supports different plant and animal species. Marshes are characterized by shallow water and grassy vegetation, while swamps have woody plants like trees and shrubs. Bogs are acidic wetlands with spongy peat deposits and are often dominated by mosses, while fens are fed by groundwater and have more diverse vegetation compared to bogs.