Ocean ecosystems changing due to shift in ocean currents

Scientists have identified significant changes in the Atlantic Ocean's ecosystem, likely due to shifts in ocean circulation. By analyzing sediment samples, they found a decline in cold water plankton and an increase in warm water species in Southern Iceland. These changes have caused some fish species to migrate northward. Additionally, warm water is now reaching the Arctic, potentially accelerating sea ice melting and impacting fisheries in the US and Canada.

What are the potential effects of warm water reaching the Arctic?

How might the shift in warm water currents affect fisheries in the US and Canada?