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Population size breeding biology and on-land threats of Cape Verde petrel (Pterodroma feae) in Fogo Island Cape Verde

机译：佛得角福戈岛的佛得角海燕（Pterodroma feae）的种群数量繁殖生物学和陆上威胁

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Cape Verde petrel (Pterodroma feae) is currently considered near threatened, but little is known about its population size, breeding biology and on land threats, jeopardizing its management and conservation. To improve this situation, we captured, marked and recaptured (CMR) birds using mist-nets over 10 years; measured and sexed them; monitored up to 14 burrows, deployed GPS devices on breeders and analyzed activity data of geolocators retrieved from breeders in Fogo (Cape Verde). We set cat traps over the colony and investigated their domestic/feral origin by marking domestic cats from a nearby village with transponders, by deploying GPS devices on domestic cats and by performing stable isotope analyses of fur of the trapped and domestic cats. The population of Fogo was estimated to be 293 birds, including immatures (95% CI: 233–254, CMR modelling). Based on geolocator activity data and nest monitoring we determined the breeding phenology of this species and we found biometric differences between sexes. While monitoring breeding performance, we verified a still ongoing cat predation and human harvesting. Overall, data gathered from trapped cats without transponder, cats GPS trips and the distinct isotopic values between domestic and trapped cats suggest cats visiting the colony are of feral origin. GPS tracks from breeders showed birds left and returned to the colony using the sector NE of the islands, where high level of public lights should be avoided specially during the fledging period. Main threats for the Cape Verde petrel in the remaining breeding islands are currently unknown but likely to be similar to Fogo, calling for an urgent assessment of population trends and the control of main threats in all Cape Verde Islands and uplisting its conservation status.
机译：佛得角海燕（Pterodroma feae）目前被认为是濒临灭绝的动物，但对它的种群规模，繁殖生物学以及对土地的威胁知之甚少，危害了其管理和保护。为了改善这种状况，我们使用雾网捕获，标记并重新捕获（CMR）鸟类超过10年；测量和性爱他们;监测了多达14个洞穴，在种鸽上部署了GPS设备，并分析了从佛戈（佛得角）的种鸽那里检索到的地理定位器的活动数据。我们在集落上设置了猫陷阱，并通过用应答器标记附近村庄的家猫，在家猫上部署GPS设备以及对被困和家猫的皮毛进行了稳定的同位素分析，调查了它们的家养/野生动物起源。 Fogo的种群估计为293羽，其中包括未成熟鸟类（95％CI：233–254，CMR建模）。根据地理定位器的活动数据和巢穴监测，我们确定了该物种的繁殖物候，并发现了性别之间的生物特征差异。在监控繁殖表现的同时，我们验证了猫捕食和人类采摘仍在进行中。总体而言，从没有应答器的被困猫，猫的GPS行程以及家猫和被困猫之间不同的同位素值收集的数据表明，前往该殖民地的猫是野生动物。来自育种者的GPS航迹显示鸟类是通过岛屿的NE区离开并返回殖民地的，在初出时期应特别避免高水平的公共照明。目前尚不清楚其余繁殖岛中佛得角海燕的主要威胁，但可能与Fogo相似，因此呼吁对所有佛得角群岛的人口趋势和主要威胁进行紧急评估，并提高其保护地位。

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