Why rivers less productive than swamps?

Rivers are generally less productive than swamps due to their flowing nature, which limits the time nutrients and organic matter can settle and be utilized by aquatic plants and organisms. The constant movement of water in rivers often results in a less stable environment, making it challenging for certain species to thrive. In contrast, swamps feature slow-moving or stagnant water, allowing for greater nutrient accumulation, higher organic matter retention, and a diverse range of habitats that support a rich array of wildlife. This stability and nutrient richness contribute to the higher productivity of swamps.