▲摘要： 众多昆虫群体的数量下降已被记录下来，并且，这一情况的潜在后果是严重的。蝴蝶是最广受调查的昆虫类群，然而对其的分析往往受限于地理范围或依赖于单一监测项目的数据。利用来自35个监测项目的超过76000次调查中记录的1260万只蝴蝶的数据，我们描绘了美国本土蝴蝶总体及特定物种的丰度趋势。

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