Lagged values (by 2 years) for the Southern Oscillation Index (SOI) showed a weak trend for more negative values over time from 1951 to 2018, indicating more El Niño (negative SOI) than La Niña (positive SOI) phases, particularly in the 1980s (Fig. 4 ).
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Long-term changes in habitat and trophic level of Southern Ocean squid in relation to environmental conditions.
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