SummaryThe endemic Galapagos Martin Progne modesta is a rare species. Population sizes in the past are unknown, but the few reports available suggest that it has become rarer in some sites. To obtain a better understanding of its population status, a simultaneous survey was conducted in 2017 around the coastline of 14 islands and 23 islets resulting in sightings of only 26 individuals. A simultaneous survey on Sierra Negra volcano on Isabela Island added five more individuals. However, observations from early expeditions and expeditions since 2015 have shown that the volcanoes of Isabela Island are important feeding areas and probable breeding areas for the Galapagos Martin, but these were largely excluded from the survey in 2017 due to logistical reasons. Historical and recent nesting sites include Tagus Cove on Isabela Island and Daphne Major Island. During our 2017 count, three possible new nesting sites were discovered: Daphne Minor, Santiago and a small crater on Punta Cristóbal on southwestern Isabela Island. From 2015 to 2018, 15 nests were also observed on the cliff in Tagus Cove. Two accessible nests were collected and revealed the first records of Philornis downsi in Galapagos Martin nests. The impact of parasitism by P. downsi is unknown but potentially severe. Given the lack of general knowledge about the biology of this species and its apparent low population sizes, further studies are urgently needed.

中文翻译：

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加拉帕戈斯马丁普罗涅莫斯塔的保护状况：对历史记录和近期调查结果的评估

摘要地方性的加拉帕戈斯马丁谦虚是稀有物种。过去的人口规模是未知的，但可用的少数报告表明它在某些地点变得越来越少。为了更好地了解其人口状况，2017 年在 14 个岛屿和 23 个小岛的海岸线上同时进行了一次调查，结果仅发现了 26 个人。同时对伊莎贝拉岛上的内格拉火山进行的调查增加了五个人。然而，早期探险和 2015 年以来的探险观察表明，伊莎贝拉岛的火山是加拉帕戈斯马丁重要的觅食区和可能的繁殖区，但由于后勤原因，这些在 2017 年的调查中大部分被排除在外。历史和最近的筑巢地点包括伊莎贝拉岛上的塔霍湾和达芙妮大岛。在我们 2017 年的统计中，发现了三个可能的新筑巢地点：达芙妮小、圣地亚哥和伊莎贝拉岛西南部蓬塔克里斯托瓦尔的一个小陨石坑。从 2015 年到 2018 年，在塔霍湾的悬崖上还观察到了 15 个巢穴。收集了两个可接近的巢穴，并揭示了凤梨在加拉帕戈斯马丁巢穴。寄生的影响P.downsi未知但可能很严重。鉴于缺乏对该物种生物学的一般知识及其明显的低种群规模，迫切需要进一步的研究。