Which outcome occurs when rapid glacial melting increases alluvial sediment deposition in a proglacial lake with seasonal thermal stratification?

💡 Explanation

Increased alluvial sediment input from glacial melting enhances microbial activity, driving redox reactions depleting dissolved hypolimnetic oxygen due to increased organic matter decomposition. This process overwhelms oxygen replenishment because summer thermal stratification restricts vertical mixing, rather than causing inversions or directly inhibiting photosynthesis.

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