Final answer:
The main concern is the decrease in krill stocks due to climate change, impacting the Antarctic ecosystem.
Explanation:
The main concern related to krill populations in the Antarctic is the decrease in krill stocks due to climate change. Climate change impacts various marine species, including krill, which are a vital part of the Antarctic ecosystem.
Climate change can lead to shifts in ecosystems, affecting different species' populations as seen with the decline in whale populations due to the whaling industry. This decline poses a threat to the supply of plankton and other small marine animals.
Overfishing and ecosystem disruptions, such as those caused by the decline in whale populations, can further exacerbate the challenges facing krill populations in the Antarctic region.
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