季节变异 seasonal variation

互联网2013-11-14

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生物的形态、色彩或种群的大小随着季节的不同而显示出的变异。蝴蝶的形态和颜色在一年之中发生两次以上的变异，有春型、夏型和秋型之分（如酒蝶）。浮游动物水蚤的形态在夏天和冬天亦不相同。雷鸟和雪兔的颜色夏天和冬天有差异。此外浮游生物和底栖生物的种群密度随季节而发生变动，也使用这个术语。

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