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You can add the following to the lead: Karl did early work on the bacterial communities of undersea hydrothermal vents and was one of the first to observe and sample these communities from a submersible, He also helped reveal the microbial food webs in the waters around Antarctica and was one of the initiators of the Hawaii Ocean Time-series. Throughout his tenure, he has continued to work on changes in biogeochemical processes and decadal scale changes in ocean ecosystems.HickoryOughtShirt?4 (talk) 03:14, 25 August 2021 (UTC)[reply]