Tides play a crucial role in shaping coastal ecosystems by influencing various factors such as water levels, sediment transport, and nutrient availability. The fluctuation of water levels due to tides can create dynamic habitats like intertidal zones, which support a diverse range of plant and animal species. Tides also help in the circulation of nutrients and oxygen, essential for the growth and survival of marine organisms. Additionally, tidal currents can impact the distribution of species by transporting larvae and other small organisms along the coast. Overall, tides are fundamental in maintaining the health and biodiversity of coastal ecosystems.