Sea ice loss and climate warming have fundamentally altered the Pacific Arctic Ocean over last three decades. The Bering Strait functions as the only gateway connecting sub-arctic waters and organisms with the Arctic Ocean. In this study, we treat Bering Strait as a source of early-stage Calanoid copepods and run individual-based model simulations for Calanus glacialis in 1993-2024, in order to better understand how changing environmental conditions and ocean circulation may have reshaped transport pathways, life-stage development and biogeographical distribution of this keystone zooplankton. Our results indicate that: (1) C. glacials development is closely linked to annual growth window, which is primarily controlled by sea ice retreat and water mass distribution; (2) ocean circulation variations alter zooplankton transport pathways transiting through Southern Chukchi Sea to Barrow Canyon, Central Channel or Long Strait, which may ultimately affect shelf to basin supply of zooplankton. These findings highlight that the changing biophysical drivers associated with sea ice loss profoundly impact the planktonic ecology and have potential cascading effects on Arctic marine food web.       

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