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Insights into migratory connectivity and conservation concerns of Red Knots Calidris canutus in the austral Pacific coast of the Americas
Bird Conservation International ( IF 1.6 ) Pub Date : 2021-04-08 , DOI: 10.1017/s0959270921000095
CAMILA GHERARDI-FUENTES , JORGE RUIZ , JUAN G. NAVEDO

Migratory species rely on several distant sites during the annual cycle which makes their conservation more complex than that of non-migratory species. Even one of the most extensively studied migratory shorebirds - the Red Knot Calidris canutus - is currently ‘Near Threatened’ at the global level. Conflicting observations of migratory routes cast uncertainty on the subspecies classification and migratory connectivity of Red Knots in the Pacific coasts of the Americas. To fill essential information gaps, we present the first detailed population morphometrics of Red Knots during the non-breeding season in the southern Pacific coast, along with resightings of these birds throughout the Americas. We also estimated daily rate of weight gain during fuelling based on body mass at captures and known departure dates. Resightings demonstrate reliance on staging areas in both the Mid-continental and Atlantic flyways during the northward migration, and additionally in the Pacific Flyway during southward migration. In addition to the strong connection with several areas also used by C. c. rufa on the North American Atlantic coast, our results show morphometric differences within the ranges of both C. c. rufa and C. c. roselaari. Given the threats faced by Red Knots, the population in Chiloé Archipelago should be treated as a separate conservation unit within interhemispheric conservation programmes for endangered shorebirds within the Americas.



中文翻译:

深入了解美洲南太平洋沿岸红结 Calidris canutus 的迁徙连通性和保护问题

迁徙物种在年度周期中依赖于几个遥远的地点,这使得它们的保护比非迁徙物种的保护更加复杂。甚至是研究最广泛的迁徙水鸟之一——红结Calidris canutus- 目前在全球范围内处于“近危”状态。对迁徙路线的相互矛盾的观察给美洲太平洋沿岸红结的亚种分类和迁徙连通性带来了不确定性。为了填补重要的信息空白,我们在南太平洋沿岸的非繁殖季节首次展示了红结的详细种群形态,以及在整个美洲对这些鸟类的重新定位。我们还根据捕获时的体重和已知的出发日期估计了加油期间的每日体重增加率。重新观测表明在向北迁移期间依赖于中部大陆和大西洋飞行路线的集结区,在向南迁移期间还依赖于太平洋飞行路线。除了与几个地区的紧密联系外C. C. rufa在北美大西洋沿岸,我们的结果显示两种C. c. 范围内的形态差异。rufaC. c. 玫瑰花鉴于红结所面临的威胁,奇洛埃群岛的种群应被视为美洲濒危滨鸟跨半球保护计划中的一个单独的保护单位。

更新日期:2021-04-08
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