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Using data from a number of summer surveys of the Chukchi Sea overthe past decade, we investigate aspects in which the benthic fauna, sediment structure,and zooplankton there are related to circulation patterns and shelf hydrographicconditions. A flow speed map is constructed that reveals the major pathways onthe shelf. Regions of enhanced flow speed are dictated by lateral constrictions—inparticular, Bering Strait and Barrow and Herald Canyons—and by sloping topographynear coastlines. For the most part, benthic epifaunal and macrofaunal suspensionfeeders are found in high flow regimes, while deposit feeders are located in regions ofweaker flow. The major exceptions are in Bering Strait, where benthic sampling wasunderrepresented, and in Herald Canyon where the pattern is inexplicably reversed.Sediment grain size is also largely consistent with variations in flow speed on the shelf.Data from three biophysical surveys of the Chukchi Sea, carried out as part of theRussian-American Long-term Census of the Arctic program, reveal close relationshipsbetween the water masses and the zooplankton communities on the shelf. Variationsin atmospheric forcing, particularly wind, during the three sampling periods causedsignificant changes in the lateral and vertical distributions of the summer and winterwater masses. These water mass changes, in turn, were reflected in the amounts andspecies of zooplankton observed throughout the shelf in each survey. Our studyhighlights the close relationship between physical drivers (wind forcing, water masses,circulation, and sediment type) in the Chukchi Sea and the biological signals in thebenthos and the plankton on a variety of time scales

The Relationship Between Patterns of Benthic Fauna and Zooplankton in the Chukchi Sea and Physical Forcing