Common Myna Acridotheres tristis is considered to be among the world’s most damaging invasive species through disturbance, predation, competition pathogen introduction to native birds and other taxa. Claimed impacts on native birds have often been based on anecdotal reports. More substantive evidence of interference with small-island endemic birds has been reported, but impacts have rarely been quantified or subjected to experimental manipulation. On Denis Island (Seychelles), up to 10% of Seychelles Warblers Acrocephalus sechellensis, and small numbers of Seychelles Fodies Foudia sechellesis and Seychelles Paradise Flycatchers Terpsiphone corvina had head injuries following myna attacks, stimulating an eradication of the mynas. Populations of four species of Seychelles’ endemic birds, introduced to the island to establish insurance populations, were estimated before, during and after the completion of the eradication, permitting assessment of the impact of myna removal on populations of the endemics. Numbers of all four endemics increased following introduction, but increases in the numbers of Seychelles Magpie Robins Copsychus sechellensis and Seychelles Paradise Flycatchers accelerated after >90% of the mynas had been removed. All endemic populations continued to increase during and after completion of the eradication in 2015, and injuries to Seychelles Warblers, Seychelles Fodies, and Seychelles Paradise Flycatchers ceased. Habitat management within a designated conservation zone on the island, into which the endemics were released and subsequently spread to occupy most of the island, also contributed to the endemic birds’ global populations and to their improved conservation status. This study confirms that mynas negatively impact small island populations of endemic birds and suggests that their potential impact has been underestimated. Myna eradication should be considered vital before endangered endemic birds and other taxa susceptible to their negative impacts are translocated to small islands for conservation reasons.

常见的 Myna Acridotheres tristis被认为是世界上最具破坏性的入侵物种之一，通过干扰、捕食、竞争病原体引入本地鸟类和其他类群。声称对本地鸟类的影响通常是基于轶事报道。已经报道了干扰小岛特有鸟类的更多实质性证据，但影响很少被量化或进行实验操作。在丹尼斯岛（塞舌尔），高达 10% 的塞舌尔莺Acrocephalus sechellensis以及少量的塞舌尔 Fodies Foudia sechellesis和 Seychelles Paradise Flycatchers Terpsiphone corvina在八哥攻击后头部受伤，刺激了八哥的根除。在根除完成之前、期间和之后估计了四种塞舌尔特有鸟类的种群，这些鸟类被引入该岛以建立保险种群，从而可以评估八哥去除对特有种群的影响。引入后所有四种地方病的数量均有所增加，但塞舌尔喜鹊知更鸟Copsychus sechellensis的数量有所增加和塞舌尔天堂捕蝇器在 >90% 的八哥被移除后加速。在 2015 年根除行动完成期间和之后，所有地方病种群继续增加，塞舌尔莺、塞舌尔福迪斯和塞舌尔天堂捕蝇器的伤害停止。岛上指定保护区内的栖息地管理，地方病被释放并随后蔓延到岛上的大部分地区，也有助于地方性鸟类的全球种群及其改善的保护状况。这项研究证实了八哥对小岛屿地方性鸟类种群的负面影响，并表明它们的潜在影响被低估了。