Tides play a crucial role in shaping coastal ecosystems by influencing various factors such as nutrient availability, sediment transport, and habitat diversity. The rise and fall of tides bring in nutrients and sediment, which can affect the distribution of plant and animal species in coastal areas. Tidal movements also create different habitats like intertidal zones, mangroves, and estuaries that support a wide range of marine life. Additionally, tides help maintain the health and productivity of coastal ecosystems by promoting water circulation and flushing out pollutants.