Interference competition has proved to be a factor of successful establishment of invasive species. This type of competition may have a stronger impact when native species have temporal niche overlap with the invasive species. The ring-necked parakeet Psittacula krameri has been successfully introduced in many countries and its interspecific agonistic behavior has already been reported. The purpose of this study is to analyze the territorial and preemptive interference competition between the ring-necked parakeet and native bird species in a recently colonized area. We used an empirical approach by recording video sequences in gardens equipped with bird feeders in winter. Our results showed that the ring-necked parakeet was the most frequent species at the feeders. Several native species showed temporal niche overlap with the ring-necked parakeet, the highest overlap being with the starling Sturnus vulgaris. The starling was also the species most impacted by interference competition with the parakeet. Our study suggests that, by being most frequently present at the feeders, by demonstrating the most agonistic behavior and by hindering access to food of the other species, the ring-necked parakeet is a superior competitor and may compete with native bird species.

中文翻译：

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入侵的长尾小鹦鹉和本地鸟类在觅食地之间的干扰竞争

干扰竞争已被证明是成功建立入侵物种的一个因素。当本地物种与入侵物种有时间生态位重叠时，这种类型的竞争可能会产生更大的影响。环颈鹦鹉 Psittacula krameri 已在许多国家成功引进，其种间激动行为已有报道。本研究的目的是分析环颈长尾小鹦鹉与最近被殖民地区的本地鸟类之间的领土和先发制人干扰竞争。我们通过在冬季配备喂鸟器的花园中录制视频序列来使用经验方法。我们的结果表明，环颈鹦鹉是饲养者中最常见的物种。几个本地物种显示出与环颈长尾小鹦鹉的时间生态位重叠，重叠度最高的是椋鸟 Sturnus vulgaris。椋鸟也是受与长尾小鹦鹉干扰竞争影响最大的物种。我们的研究表明，环颈鹦鹉最常出现在喂食器上，表现出最激烈的行为并阻碍其他物种的食物，因此环颈鹦鹉是一种优越的竞争者，可能与本地鸟类竞争。