Which mechanism limits biological productivity in stagnant, deep ocean basins cut off from surface circulation?

💡 Explanation

When deep basins are isolated, nutrient depletion occurs because the normal upwelling and mixing that replenishes nutrients from decomposing organic matter in the depths is prevented, limiting primary productivity. Therefore, nutrient depletion is the primary limiting factor, rather than irradiance, salinity, or predation, which rely on different environmental conditions.

• Which outcome accelerates coastal erosion when thermokarst develops along Arctic shorelines?
• Which risk increases following a catastrophic levee breach due to overtopping during an extreme flood event?
• Which thermocline behavior limits nutrient replenishment during stratification?
• Which fluvial outcome results as bend sinuosity increases?
• Which phenomenon limits primary productivity after an upwelling event with prolonged high winds?
• Which landform feature forms when longshore drift connects an island to the mainland?