Because many zooplankton species eat phytoplankton, shifts in timing or abundance of phytoplankton can quickly affect zooplankton populations, which then affects species along the food chain. When there are too many of certain nutrients in the water, for instance, harmful algal blooms like red tides are the result. Plankton are incredibly important to the ocean ecosystem, and very sensitive to changes in their environment, including in the temperature, salinity, pH level, and nutrient concentration of the water. This process is considered the largest migration on Earth so many animals make this journey that it can be observed from space. But at night, these microscopic creatures venture up to the surface to feed on phytoplankton. Can plankton be called nekton Organisms such as jellyfish and others are considered plankton when they are very small and swim at low Reynolds numbers, and considered nekton as they grow large enough to swim at high Reynolds numbers. Organisms as phytoplankton, zooplankton, nekton, benthos, or decomposers. During the daylight hours, zooplankton generally drift in deeper waters to avoid predators. Phytoplankton are the primary producers in the ocean. Zooplankton (animal like-protozoa or jellyfish). Krill may be the most well-known type of zooplankton they are a major component of the diet of humpback, right, and blue whales. Most zooplankton eat phytoplankton, and most are, in turn, eaten by larger animals (or by each other). Photos By: Pedro Szekely (CC BY-SA 2.0), Yogendra Joshi (CC BY 2.Zooplankton include microscopic animals (krill, sea snails, pelagic worms, etc.), the young of larger invertebrates and fish, and weak swimmers like jellyfish. JELLYFISSH PLANKTON NEKTON OR BENTHOS FREEHowever, all the nekton are free living animals.
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