It is generally reported by ecologists and the climate science camp that there has been a dangerous decline in the species of krill known as Euphausia Superba over the past few decades and the cause is the melting ice of Antarctica by global warming. The Krill sometimes feed on the underside of ice. A simple picture, less sea ice from the predicted global warming and there is less Krill.
The story took hold and the media focus on ice loss in West Antarctica on the tip of the Peninsula as evidence of disruption of their habitat. This area has apparently seen some warming but it is only a small percentage of Antarctica.
So is the overall pattern the same? If a decrease in sea ice disturbs their habitat and feeding leading to a decline then it follows that an increase in sea ice will improve their habitat and feeding regime and mitigate any decline, possibly even increasing their biomass.
In a 2006 research paper “Antarctic Temperature and Sea Ice Trends over the past Century: An assessment of Antarctic Climate Data” by George Taylor, the results are that sea ice has been increasing and the temperature falling.