Low fitness at low latitudes: Wintering in the tropics increases migratory delays and mortality rates in an Arctic breeding shorebird

• Published in: Journal of Animal Ecology
• Main Authors: Reneerkens, Jeroen, Versluijs, Tom S. L., Piersma, Theunis, Alves, Jose, Boorman, Mark, Corse, Colin, Gilg, Olivier, Hallgrimsson, Gunnar Thor, Lang, Johannes, Loos, Bob, Ntiamoa‐Baidu, Yaa, Nuoh, Alfred A., Potts, Peter M., Horn, Job, Lok, Tamar
• Other Authors: Research Centre in South Iceland (UI), Rannsóknasetur Suðurlandi (HÍ), Líf- og umhverfisvísindadeild (HÍ), Faculty of Life and Environmental Sciences (UI), Verkfræði- og náttúruvísindasvið (HÍ), School of Engineering and Natural Sciences (UI), Háskóli Íslands, University of Iceland
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2019
• Subjects: Demography; Fitness; Migration; Nutrient storage strategies; Site fidelity; Solar geolocation; Survival; Timing; Vaðfuglar; Far dýra; Lifun (náttúrufræði); Lýðfræði; Arctic; Calidris alba; Iceland; Zackenberg; Sanderling
• Online Access: https://hdl.handle.net/20.500.11815/1631; https://doi.org/10.1111/1365-2656.13118

Publisher's version (útgefin grein) Evolutionary theories of seasonal migration generally assume that the costs of longer migrations are balanced by benefits at the non-breeding destinations. We tested, and rejected, the null hypothesis of equal survival and timing of spring migration for High Arctic breeding sanderling Calidris alba using six and eight winter destinations between 55°N and 25°S, respectively. Annual apparent survival was considerably lower for adult birds wintering in tropical West Africa (Mauritania: 0.74 and Ghana: 0.75) than in three European sites (0.84, 0.84 and 0.87) and in subtropical Namibia (0.85). Moreover, compared with adults, second calendar-year sanderlings in the tropics, but not in Europe, often refrained from migrating north during the first possible breeding season. During northward migration, tropical-wintering sanderlings occurred at their final staging site in Iceland 5–15 days later than birds wintering further north or south. Namibia-wintering sanderlings tracked with solar geolocators only staged in West Africa during southward migration. The low annual survival, the later age of first northward migration and the later passage through Iceland during northward migration of tropical-wintering sanderlings, in addition to the skipping of this area during northward but not southward migration by Namibia-wintering sanderlings, all suggest they face issues during the late non-breeding season in West Africa. Migrating sanderlings defy long distances but may end up in winter areas with poor fitness prospects. We suggest that ecological conditions in tropical West Africa make the fuelling prior to northward departure problematic. Annual expeditions to Mauritania were organized by NIOZ, and we especially thank Maarten Brugge, Anne Dekinga, Jutta Leyrer and Bernard Spaans for their contributions. The Parc National du Banc d'Arguin granted research permits and facilitated access. J.R. and T.S.L.V. thank Aarhus University for logistical support at Zackenberg. Benoît Sittler ...