Which outcome reduces primary productivity when deep-water upwelling weakens?

💡 Explanation

A reduction of upwelling reduces nutrient transport because the mechanism supplying dissolved nutrients to the photic zone weakens, reducing the base energy for phytoplankton; therefore, primary productivity declines rather than increases in alternative conditions.

• Which outcome occurs when a levee's freeboard is insufficient during peak discharge?
• Which hydrologic condition creates incised meanders in alluvial valleys?
• Which outcome results when river sediment deposition patterns shift?
• Which landform develops if glacier thaws within cirques?
• Which outcome occurs when groundwater permeates fault gouge?
• Which factor most increases isostatic rebound rates in fjord regions post-glaciation?