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← GeographyWhich ecological impact occurs during strong El Niño phases?
A)Decline in coastal fisheries productivity✓
B)Increased upwelling of nutrient-rich waters
C)Expansion of kelp forest ecosystems
D)Enhanced oxygenation within the deep ocean
💡 Explanation
A decline in fisheries occurs because El Niño brings warmer surface water, suppressing upwelling. This suppression reduces nutrient availability via nutrient lift, leading to decreased phytoplankton production; therefore, fisheries decline rather than benefit.
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