The continued loss, fragmentation, and degradation of forest habitats is driving an extinction crisis for tropical and subtropical bird species. This loss is particularly acute in the Atlantic Forest of South America, where it is unclear whether several endemic bird species are extinct or extant. We collate and model spatiotemporal distributional data for one such ‘lost’ species, the Purple-winged Ground Dove Paraclaravis geoffroyi, a Critically Endangered endemic of the Atlantic Forest biome, which is nomadic and apparently dependent on masting bamboo stands. We compare its patterns of occurrence with that of a rare ‘control’ forest pigeon, the Violaceous Quail-Dove Geotrygon violacea, which occurs in regional sympatry. We also solicit information from aviculturists who formerly kept the species. We find that the two species share a similar historical recording rate but can find no documentary evidence (i.e. specimens, photos, video, sound recordings) for the persistence of Purple-winged Ground Dove in the wild after the 1980s, despite periodic sighting records, and after which time citizen scientists frequently documented the control species in the wild. Assessments of the probability that the species is extant are sensitive to the method of analysis, and whether records lacking documentary evidence are considered credible. Analysis of the temporal sequence of past records reveals the extent of the historical range contraction of the Purple-winged Ground Dove, while our species distribution model highlights the geographic search priorities for field ornithologists hoping to rediscover the species - aided by the first recording of the species vocalizations which we obtained from interviews with aviculturists. Our interviews also revealed that the species persisted in captivity from the 1970s until the 1990s (up to 150 birds), until a law was passed obstructing captive breeding efforts by private individuals, putting an end to perhaps the best chance we had to save the species from extinction.

中文翻译：

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评估神秘的竹专家紫翅地鸽的灭绝概率

森林栖息地的持续丧失，破碎和退化正在推动热带和亚热带鸟类物种的灭绝危机。这种损失在南美洲的大西洋森林中尤为严重，目前尚不清楚几种特有鸟类是否已灭绝或灭绝。我们整理并建模了一个这样的“失落”物种的时空分布数据，即紫色翅地鸽Paraclaravis geoffroyi，这是大西洋森林生物群系的一种极度濒危的特有物种，它是游牧的，显然依赖于桅杆竹架。我们将它的发生模式与罕见的“对照”森林鸽子（紫罗兰色鹌鹑鸽土色紫薇）的发生模式进行比较，该物种出现在区域象征物中。我们还从以前保存该物种的鸟类学家那里收集信息。我们发现，这两个物种的历史记录率相似，但是尽管有定期的目击记录，但他们找不到1980年代后野外的紫翅野鸽的持久存在的文献证据（例如标本，照片，视频，录音），在此之后，公民科学家经常记录野外的控制物种。对物种存在的可能性的评估对分析方法很敏感，并且认为缺乏文献证据的记录是否可信。对过去记录的时间顺序的分析揭示了紫翅地鸽的历史范围收缩的程度，而我们的物种分布模型则突出显示了希望重新发现该物种的野鸟鸟类学家的地理搜索优先级-借助我们从鸟类学家的访谈中首次获得的物种发声记录。我们的访谈还显示，从1970年代到1990年代，该物种一直处于人工饲养状态（最多150只鸟），直到通过了一部法律，阻止了私人的人工繁殖工作，从而终结了我们不得不拯救该物种的最佳机会从灭绝。