Which phenomenon causes increased anchovy productivity when coastal upwelling occurs off Peru's west coast?

💡 Explanation

When coastal upwelling occurs, the mechanism involves deep, cold water rising because wind displacement near the surface allows the nutrient-rich waters to be transported upward, triggering primary production, like phytoplankton, at the bottom of the food chain. Therefore, nutrient transfer results, rather than insolation, salinity or oxygen changes needing other geophysical mechanisms.

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