Antarctic krill are the Southern Ocean's engine, numbering 780 trillion individuals across the region.
In short: These shrimp-like crustaceans are far more than mere fish food. By grazing on phytoplankton and cycling essential elements, they dictate the health of global carbon cycles. Now, a massive data rescue project is finally mapping their vast, shifting populations to protect the future of this fragile Antarctic ecosystem.
Antarctic krill (Euphausia superba) are central to the Southern Ocean, acting as a vital link between primary production and higher predators. Numbering approximately 780 trillion individuals, these crustaceans graze on phytoplankton, effectively shaping the region's biogeochemical cycles. Their role is so significant that they influence the movement of carbon and nitrogen, serving as a foundational food source for everything from brittlestars to great whales.
Understanding these populations has historically been difficult because data were scattered across decades of faded logbooks and inaccessible archives. The KRILLBASE project, an international effort involving researchers from eleven countries, was established to rescue this information. In 2016, the project released a comprehensive database of 12,880 net samples collected between 1926 and 2016. This resource provides a standardized look at krill density, helping scientists track ecological changes over nearly a century.
While the data are invaluable, they come with necessary caveats. Sampling methods have evolved significantly since 1926, and because nets often under-sample mobile animals, the figures serve as a relative index rather than an absolute census. Furthermore, the project tracks salps—jelly-like filter feeders that often thrive when krill struggle. By monitoring both species, researchers can better understand how climate change and commercial fishing might disrupt the delicate balance of the Southern Ocean.
The importance of this work extends to conservation policy and the design of marine protected areas. As fisheries continue to harvest krill, the ability to model population shifts is essential for sustainable management. By combining historical data with ongoing monitoring, KRILLBASE provides the evidence needed to ensure that the Southern Ocean's most important zooplankton taxa remain a stable pillar of the global marine ecosystem.
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Sources
- Summary by Intellect · source: KRILLBASE - British Antarctic Survey
- Also: Antarctic krill
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