What is one effect of ocean currents on marine ecosystems?

Ocean currents play a crucial role in marine ecosystems, primarily by facilitating the distribution of nutrients and creating diverse habitats. As currents move, they transport nutrients from the deep ocean to the surface, where sunlight can promote the growth of phytoplankton. This phytoplankton serves as the foundation of the marine food web, supporting a wide variety of marine life, including fish, marine mammals, and seabirds.

Moreover, ocean currents can influence temperature gradients in different marine zones, which can create varied living conditions for different species. This diversity of habitats allows for a range of organisms to thrive, fostering greater overall biodiversity within marine ecosystems. When currents mix waters from different regions, they can also introduce new species and promote a dynamic community structure.

While other options may touch on different aspects related to marine ecosystems, they do not reflect the positive impact that ocean currents have on nutrient distribution and habitat diversity in the same way.