Somewhat counter-intuitively, a Japanese researcher has reportedly demonstrated that Adelie penguins appear to benefit from the current melting of sea ice around Antarctica (https://www.theguardian.com/environment/2020/jun/24/adelie-penguins-could-thrive-as-result-of-sea-ice-melting). This small penguin mainly feeds on krill and squid, so reductions in the sea ice make its foraging activity more efficient. Foraging is, of course key to the penguin's breeding and feeding their developing chicks. I strongly suspect that reducing the ice has a detrimental effect on survival in the larger species of penguin (especially the Emperor).
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