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The community respiration of 2 tidally dominated cold-water coral (CWC) sites wasestimated using the non-invasive eddy correlation (EC) technique. The first site, Mingulay ReefComplex, was a rock ridge located in the Sea of Hebrides off Scotland at a depth of 128 m and thesecond site, Stjernsund, was a channel-like sound in Northern Norway at a depth of 220 m. Bothsites were characterized by the presence of live mounds of the reef framework-forming scleractinianLophelia pertusa and reef-associated fauna such as sponges, crustaceans and other corals. Themeasured O2 uptake at the 2 sites varied between 5 and 46 mmol m–2 d–1, mainly depending onthe ambient flow characteristics. The average uptake rate estimated from the ~24 h long deploymentsamounted to 27.8 ± 2.3 mmol m–2 d–1 at Mingulay and 24.8 ± 2.6 mmol m–2 d–1 at Stjernsund(mean ± SE). These rates are 4 to 5 times higher than the global mean for soft sediment communitiesat comparable depths. The measurements document the importance of CWC communities forlocal and regional carbon cycling and demonstrate that the EC technique is a valuable tool forassessing rates of benthic O2 uptake in such complex and dynamic settings.

Benthic O2 uptake of two cold-water coral communities estimated with the non-invasive eddy correlation technique