Ocean ecosystems changing due to shift in ocean currents

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According to research published in the journal Geophysical Research Letters, scientists have discovered significant changes in the Atlantic Ocean's ecosystem that
might have been caused by shifts in ocean circulation.

To examine changes in the ecosystem, researchers used a plastic tube to take samples from sediments in the ocean floor. Scientists then studied the fossil plankton available in newer and older sediments.

Results show that changes in the ocean's water circulation have caused a decline in cold water plankton and a rise in warm water species in southern Iceland as the flow of warm water has overtaken cold waters.

Scientists who participated in the study believe that these shifts have caused some fish species, such as mackerel, to travel northward.

Results also showed that warm water is now reaching the Arctic. Scientists note that this could be aggravating the melting of sea ice there. The shift in the direction of the warm water currents could also affect key fisheries in the U.S. and Canada.

RUNDOWN SHOWS:
1. Atlantic Ocean circulation
2. Extraction and examination of ocean sediments
3. Reduction of cold water plankton and movement of mackerel fish
4. Melting sea ice and impact on fisheries

VOICEOVER (in English):
"According to research published in the journal Geophysical Research Letters, scientists have discovered significant changes in the Atlantic Ocean's ecosystem that
might have been caused by shifts in ocean circulation."

"In order to examine changes in the ecosystem, researchers used a plastic tube to take samples from sediments in the ocean floor. Scientists then studied the fossil plankton available in newer and older sediments."

"Results show that changes in the ocean's water circulation have caused a decline in cold water plankton and a rise in warm water species in southern Iceland as the flow of warm water has overtaken cold waters."

"Scientists who participated in the study believe that these shifts have led to some fish species, such as mackerel, to travel northward."

"Results also showed that warm water is now reaching the Arctic. Scientists note that this could be aggravating the melting of sea ice there. The shift in the direction of the warm water currents could also affect key fisheries in the U.S. and Canada."

SOURCES:
Geophysical Research Letters, The Conversation
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL087577
https://theconversation.com/seabed-fossils-show-the-ocean-is-undergoing-a-change-not-seen-for-10-000-years-136804