Invasive species can reach high abundances and dominate native environments. One of the most impressive examples of ecological invasions is the spread of the African subspecies of the honey bee throughout the Americas, starting from its introduction in a single locality in Brazil. The invasive honey bee is expected to more negatively impact bee community abundance and diversity than native dominant species, but this has not been tested previously. We developed a comprehensive and systematic bee sampling scheme, using a protocol deploying 11,520 pan traps across regions and crops for three years in Brazil. We found that invasive honey bees are now the single most dominant bee species. Such dominance has not only negative consequences for abundance and species richness of native bees but also for overall bee abundance (i.e., strong “numerical” effects of honey bees). Contrary to expectations, honey bees did not have stronger negative impacts than other native bees achieving similar levels of dominance (i.e., lack of negative “identity” effects of honey bees). These effects were markedly consistent across crop species, seasons and years, and were independent from land-use effects. Dominance could be a proxy of bee community degradation and more generally of the severity of ecological invasions.

中文翻译：

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优势对蜜蜂群落的负面影响：入侵蜜蜂的影响与本地蜜蜂不同吗？

入侵物种可以达到高丰度并主宰原生环境。生态入侵最令人印象深刻的例子之一是蜜蜂的非洲亚种在整个美洲的传播，从它在巴西的一个地方被引入开始。与本地优势物种相比，入侵的蜜蜂预计会对蜜蜂群落的丰度和多样性产生更大的负面影响，但此前尚未对此进行测试。我们开发了一个全面和系统的蜜蜂采样计划，使用一个协议，在巴西跨地区和作物部署 11,520 个盘式陷阱三年。我们发现入侵的蜜蜂现在是最主要的蜜蜂物种。这种优势不仅对本地蜜蜂的丰度和物种丰富度产生负面影响，而且对整体蜜蜂丰度（即，蜜蜂的强烈“数字”效应）。与预期相反，蜜蜂并没有比其他达到类似优势水平的本地蜜蜂产生更大的负面影响（即缺乏蜜蜂的负面“身份”效应）。这些影响在作物种类、季节和年份之间显着一致，并且与土地利用影响无关。优势可能是蜜蜂群落退化的代表，更普遍的是生态入侵的严重程度。