Clear alpine lakes stay blue partly because nutrients stay scarce
High mountain lakes fed by snowmelt and thin soils often carry little nitrogen and phosphorus, so algae stay sparse and sunlight penetrates deep into cold, blue water.
That oligotrophic clarity is fragile: a pulse of fertilizer, waste, or dust can spark blooms that cloud the gem-like view and choke deep oxygen. Sparse food webs also mean slow recovery after disturbance.
Beauty can be a nutrient budget. Alpine rivers-lakes wonders stay pollution-free looking when surrounding habitats keep runoff lean — scarcity as the price of turquoise.
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