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On two ~25 day long, trans-Atlantic cruises, the Ward Lab ventured to the subarctic ocean. In collaboration with the Sigman Lab, they studied the contribution of pico- to meso-sized plankton to the cycling of carbon and nitrogen. These late summer (2013) and spring (2014) subarctic North Atlantic cruises followed-up the cruises in the western subtropical gyre (Sargasso Sea) and provided the opportunity to compare the roles of plankton functional groups between two very different ocean biomes.