Plankton. Marine life 3 categories: Benthos : bottom dwellers; sponges, crabs Nekton : strong swimmers- whales, fish, squid Plankton : animal/plants that drift in water. The have little control over their movement. Includes: diatoms, dinoflagellates, larvae, jellyfish, bacteria.
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Phytoplankton- restricted to the euphotic zone where light is available for photosynthesis.
Zooplankton:larvae, copepods. Some produce oil to help them float. Smaller population size than the phytoplanktoton. Zooplankton population size increases after phytoplankton size increases.
Winter Spring Summer Fall
Each species has its own preferred day and night depth range, which may vary with lifecycle.
Composite echogram of hydroacoustic data showing a distinct krill scattering layer.
Black line represents surface tracking of a blue whale feeding