Which risk increases for coastal fisheries in the eastern Pacific Ocean when El Niño suppresses upwelling?

💡 Explanation

When El Niño suppresses upwelling, nutrient transport from the deep ocean is reduced because weakening trade winds reduce the pressure gradient. This leads to a decrease in primary productivity. Therefore nutrient depletion and subsequent fish stock collapse results, rather than algal blooms, mining disruptions, or predation changes which depend on other processes.

• Which mechanism reduces streamflow during El Niño events in the Amazon basin?
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• Which geological impact results from extensive tephra deposition?
• Which outcome occurs when permafrost thaws beneath a sloped glacial moraine?
• Which outcome occurs when seismic waves encounter unconsolidated sediments overlying bedrock during an earthquake?
• Which process drives the formation of horst and graben structures along a normal fault?