十万个为什么·科学阅读30篇（3）
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Why Do Some Lakes Change Color Seasonally?
为什么有些湖泊会随季节变换颜色？
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Certain lakes turn pink, green, or red during warm summer months.某些湖泊在温暖的夏季会变成粉红、绿色或红色。
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Tiny microbes called archaea and algae grow fast in salty, sunny water.一种名为古菌和藻类的微小微生物，在咸而阳光充足的水中迅速繁殖。
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They make pigments like beta-carotene to protect themselves from strong sunlight.它们产生β-胡萝卜素等色素，以抵御强烈的阳光。
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Wind and rain mix the water, spreading color evenly across the lake surface.风和雨水搅动湖水，使颜色均匀铺满湖面。
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In winter, cold temperatures slow growth and the lake looks clear or gray.冬季低温抑制其生长，湖水因而显得清澈或灰暗。
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Scientists monitor these color shifts to track climate and ecosystem health.科学家通过监测这些变色现象来追踪气候变化和生态系统健康状况。
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One famous example is Lake Hillier in Australia — pink all year round.一个著名例子是澳大利亚的希利尔湖——全年呈粉红色。
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The color is harmless and comes only from natural living organisms.这种颜色无害，完全源于天然活体微生物。