Tides influence coastal ecosystems in a variety of ways. The rising and falling of tides bring in nutrients and oxygen to coastal areas which can support diverse marine life. Tides also help in the mixing of water, which can affect temperature and salinity levels, creating unique habitats for different species. Additionally, tides can impact sediment transport and erosion along the coast, shaping the physical environment of coastal ecosystems. Overall, tides play a crucial role in the health and biodiversity of coastal ecosystems.