Researchers using AWI’s 21-station Hausgarten observatory in Fram Strait found thriving new Arctic seabed communities—soft corals, sea stars, bryozoa, anemones and sponges—growing on rock “dropstones” released by melting icebergs.
Satellite tracking and deep-sea imagery linked debris-streaked icebergs to fresh stone clusters on the seafloor, showing how the rocks create hard surfaces that sedentary animals can colonize and permanently expand biodiversity.
Samples confirmed the stones’ mineral makeup matched rocks carried by the icebergs, while reconstructions traced most bergs to northeastern Greenland and parts of the Russian High Arctic.
Greenland data were strong enough to map how glaciers scoop up and export rock to sea, but patchier Russian satellite coverage left researchers unable to say whether climate change has increased iceberg production there.
The findings also point to practical risks: more icebergs and newly deposited stones in shallow Arctic waters could threaten cruise ships, cargo traffic, oil and gas activity, and eventually bottom trawling as activity moves north.
As melting glaciers create new deep-sea life, is this a sign of Arctic resilience or a prelude to collapse?
Will newly discovered Arctic coral gardens become the next battleground between deep-sea miners and conservationists?
Arctic Seafloor Transformed: Tenfold Rise in Dropstones from Iceberg Surge Reshapes Marine Habitats and Human Hazards
Overview
The Arctic seafloor is undergoing rapid transformation due to accelerated Arctic warming and glacial retreat, which cause more icebergs to break off from Greenland's glaciers. As these icebergs drift and melt, they release rocks and sediments called dropstones onto the seafloor, creating new hard surfaces in areas that were mostly soft mud. These new habitats act as stepping stones for marine life, increasing biodiversity and reshaping benthic communities. Scientists have observed a dramatic rise in both the number and size of dropstones since the early 2000s, leading to significant ecological changes and new challenges for navigation and human activities in the region.