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Why is krill important to the Antarctic food chain?
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Antarctica
Paradise Bay, Antarctica.
Krill are essential to the Antarctic food chain because they serve as a primary food source for a wide variety of marine life, including whales, seals, fish, squid, and seabirds.12
Their importance is driven by two key factors:
- High Density: Krill congregate in vast, dense schools, which allows large predators—such as baleen whales—to efficiently consume massive quantities of them.12
- Nutritional Value: As a prolific form of zooplankton that feeds on phytoplankton, krill act as a vital link in transferring energy from microscopic organisms to higher-level predators in the Antarctic ecosystem.12
Because they are so central to the survival of these populations, ecologists are concerned that environmental changes, such as the loss of sea ice due to climate change, or the expansion of human fisheries, could disrupt the entire regional food web.1