Rare footage shows abundant marine life at a retreating South Greenland glacier

A remotely operated vehicle recorded zooplankton, fish and other organisms at the glacier’s underwater edge in May and August.

Editorial illustration — not from the study.

Researchers used a remotely operated underwater vehicle to observe the ocean boundary of Naajat Sermiat, a marine-terminating glacier in South Greenland. The footage showed large quantities of zooplankton, fish and other organisms at the glacier terminus in both May and August, along with glacier morphology and the discharge of meltwater and suspended material.

Aerial measurements tracked turbid plumes within meters of the glacier, while boat-based observations followed how those plumes changed down the fjord. The findings identify the glacier boundary as a dynamic water-and-sediment interface and an ecological hotspot.

Life at the glacier edge

The researchers directly observed glacier shape, meltwater discharge and suspended material at Naajat Sermiat’s ocean boundary using a remotely operated underwater vehicle. They found large quantities of zooplankton, fish and other organisms there in both May and August. The organisms seemed to be responding directly to material from the glacier, rather than to deeper nutrient-rich waters carried upward into the area, as previously assumed. Aerial measurements showed the structure of turbid plumes close to the glacier terminus, and boat observations showed how the plumes developed farther down the fjord.

Why the boundary matters

The study suggests that the underwater edge of a marine-terminating glacier can directly support marine life while also shaping water movement and sediment transport in a fjord. As glaciers melt faster and retreat, changes at these boundaries could affect food webs, carbon movement and nutrient cycles, with consequences for coastal ecosystems.

Evidence and caveats

The evidence comes from direct observations made with a remotely operated underwater vehicle at one glacier in South Greenland, supplemented by aerial measurements and boat-based observations. The observations were made in May and August, but the abstract does not give the study’s observation duration, the quantities of organisms recorded or how representative Naajat Sermiat is of other glaciers. The organisms’ apparent response to glacier material is described as seeming to be direct, so the observations do not establish the full cause of the biological activity or predict how ecosystems will change as glaciers retreat.

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