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Foraging behaviour and diet of Brown boobies Sula leucogaster from Tinhosas Islands, Gulf of Guinea
Marine Biology ( IF 2.4 ) Pub Date : 2021-05-19 , DOI: 10.1007/s00227-021-03904-0
Edna Correia , Paulo Catry , Frazer Sinclair , Yodiney dos Santos , Joana I. Robalo , Cristina S. Lima , José Pedro Granadeiro

Seabirds are a highly threatened group, yet the foraging ecology of several species remains poorly understood. Brown boobies breed in all oceans in the tropical region and are common across their range. In Tinhosa Grande (São Tomé and Príncipe), this species breeds in one of the largest colonies of seabirds in the east tropical Atlantic. We studied the foraging ecology of Brown boobies from this colony during the chick-rearing period. Thirty-three birds were tracked with GPS loggers and their diet was analysed from 11 regurgitations, using traditional and DNA barcoding techniques for prey identification. A total of 127 completed foraging trips were identified, 89% of which lasted less than 24 h. Females performed significantly longer trips and both sexes foraged preferentially over deep oceanic waters. The diet of Brown boobies included juvenile fish and squid (Sthenoteuthis pteropus), comprising mostly fish species whose juvenile phases live in the pelagic environment, and only migrate to coastal waters when adults. The most frequent of those prey found was Flying gurnard (Dactylopterus volitans). The relevance of such prey shows that Brown booby conservation depends not only on the management of their foraging areas and breeding sites but also on the correct management of the coastal adjacent areas that support the adult individuals of some of their prey. Our results suggest that the areas closest to the colony do not have available resources for these birds to feed on and that Brown boobies may be associate with subsurface marine predators or with sargassum patches to forage.



中文翻译:

几内亚湾廷霍萨斯群岛的棕Brown苏拉白雪松的觅食行为和饮食

海鸟是一个受到高度威胁的群体,但对几种物种的觅食生态学仍然知之甚少。棕色bo鸟在热带地区的所有海洋中繁殖,在整个范围内都很常见。在Tinhosa Grande(圣多美和普林西比),该物种在东热带大西洋最大的海鸟殖民地之一繁殖。我们研究了在小鸡饲养期间该种群的棕色Brown鸟的觅食生态。用GPS记录器跟踪了33只鸟,并使用传统和DNA条形码技术对猎物进行了鉴定,从11次反流中分析了它们的饮食。总共鉴定出127次完整的觅食旅行,其中89%的持续时间少于24小时。雌性的行程明显更长,而两性都优先在深海中觅食。Sthenoteuthis pteropus),主要由鱼类组成,其幼年阶段生活在中上层环境中,成年后才迁移到沿海水域。其中最常见的猎物是飞gu(Dactylopterus volitans)。这种猎物的相关性表明,布朗·布比保护区不仅取决于其觅食区和繁殖地点的管理,而且还取决于支持某些猎物成年个体的沿海邻近地区的正确管理。我们的研究结果表明,距离该殖民地最近的地区没有可供这些鸟类觅食的可用资源,并且棕色bo鸟可能与海底捕食者或海藻斑块相关联地觅食。

更新日期:2021-05-19
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