Which ecological impact occurs when increased stratification disrupts typical surface water overturn within a subtropical gyre?

💡 Explanation

When stratification increases, nutrient mixing decreases because density gradients limit vertical transport, reducing nutrient supply to the surface waters and limiting phytoplankton growth. Therefore decreased primary production results, rather than increased oxygen, upwelling intensification, or reef effects which don't depend primarily on open ocean nutrient overturn.

• Which risk increases after prolonged aquifer depletion near a major fault line?
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• Which outcome occurs when rapid differential heating amplifies the thermal effect within a stationary air mass?
• Which phenomenon causes increased volcanic activity following a large earthquake along a subduction zone?
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• Which outcome results from intensified ocean evaporation due to the Albedo effect?