Which outcome on South American fisheries occurs during an El Niño event, altering ocean currents?

💡 Explanation

When El Niño occurs, weakened trade winds cause reduced upwelling along the South American coast because reduced upwelling of colder water containing more nutrients is suppressed. Therefore, fisheries decline due to lack of nutrients, which is option A, rather than altered salinity, increased oxygen, or decreased algal blooms reflecting other potential but incorrect outcomes.

• Which mechanism causes preferential sediment deposition on the uphill side of a fault-controlled alluvial fan?
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• During coastal upwelling events, which outcome occurs due to nutrient-rich water rising to the surface?
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