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Climate: German researchers document dramatic Arctic ecosystem changes linked with melting sea ice

On a voyage

On a voyage to the central Arctic Ocean, German researchers documented significant changes to marine ecosystems linked with melting Arctic sea ice. Photo courtesy Alfred Wegener Institute.

Massive algae blooms change composition of sea floor food chain

By Summit Voice

SUMMIT COUNTY — Arctic Ocean ecosystems are sure to change in as-yet unexpected ways as sea ice continues to shrink. This summer, German Polar researchers and microbiologists documented one of those changes, observing an unprecedented bloom of ice-loving algae on patches of thin summer ice.

The researchers hypothesized three years ago that ice algae could grow faster under the thinning sea ice of the Central Arctic. This past summer’s observations support the hypothesis: The ice algae were responsible for almost half of the primary production in the Central Arctic Basin. The paper is published in the journal Science.

“We were able to demonstrate for the first time that the warming and the associated physical changes in the Central Arctic cause fast reactions in the entire ecosystem down to the deep sea,” said Lead researcher Dr. Antje Boetius, of the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research. Continue reading

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