Tides influence marine ecosystems in various ways. The ebb and flow of tides bring nutrient-rich water to coastal areas, promoting the growth of phytoplankton and providing food for various marine organisms. Tides also help in the distribution of larvae, facilitate the movement of marine species, and influence breeding and feeding patterns. Additionally, tides can cause changes in water temperature, salinity, and oxygen levels, affecting the overall health and biodiversity of marine ecosystems.