SOURCE: BBC

DATE: January 21, 2019

SNIP: A keystone prey species in the Southern Ocean is retreating towards the Antarctic because of climate change.

Krill are small, shrimp-like creatures that swarm in vast numbers and form a major part of the diets of whales, penguins, seabirds, seals and fish.

Scientists say warming conditions in recent decades have led to the krill contracting poleward.

If the shift is maintained, it will have negative ecosystem impacts, they warn.

Already there is some evidence that macaroni penguins and fur seals may be finding it harder to get enough of the krill to support their populations.