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← GeographyWhich marine ecosystem effect results when thermocline depth sharply increases?
A)Reduced coastal dissolved oxygen levels✓
B)Decreased frequency of harmful algal blooms
C)Increased supply of surface nutrients
D)Accelerated coral reef bleaching events
💡 Explanation
Reduced upwelling decreases nutrient supply to surface aquatic ecosystems, and oxygen dissolution diminishes because shallower thermoclines do not permit benthic water mixing; therefore, dissolved oxygen reduces rather than improves other environmental markers under stratification conditions.
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