Why do some plankton migrate vertically?

Some plankton migrate vertically primarily to optimize their feeding and reproductive strategies. During the day, many plankton species descend to deeper waters to avoid predators and conserve energy, while at night, they ascend to the surface to access abundant sunlight and nutrients for photosynthesis or feeding. This diurnal migration helps maintain their populations and supports the overall health of marine ecosystems. Additionally, vertical migration allows them to take advantage of varying environmental conditions, such as temperature and light.