Abstract
This work was performed within the framework of project AgroSOS (CGL2015-66016-R Spanish Ministry of Economy and Competitiveness - FEDER funds [EU]) and the Government of Aragon (Spain) through a predoctoral internship to J. M. Orellana (BOA 20/07/2017).
Highlights
Migratory birds have been instrumental for understanding climate-change effects because they show a wide array of changes in migration phenology, but there are still many aspects that need further research (Knudsen et al 2011, Dunn and Møller 2019)
In this study we investigate the relationships between migration and climate in the Common Crane phenology during five decades at Gallocanta Lake, one of the most important wintering and stopover sites in the species’ western migratory flyway
We provided additional results of dates corresponding to the 50th percentile of Common Crane counts during autumn and spring migrations, because quantifying the entire seasonal distributions of migration dates could result in more stable inferences than relying on a single date of maximum bird counts (Cohen et al 2015)
Summary
Migratory birds have been instrumental for understanding climate-change effects because they show a wide array of changes in migration phenology, but there are still many aspects that need further research (Knudsen et al 2011, Dunn and Møller 2019). The onset of migration is determined endogenously, its timing is flexible and can be modified in response to changes in weather and phenology along migration routes (Marra et al 2005). Such flexibility in migration speed and stopover duration, seems insufficient to adjust to ongoing climate change and is unlikely to explain the observed arrival advancements in some species (Knudsen et al 2011, Charmantier and Gienapp 2014, Schmaljohann and Both 2017). Examining spring phenology in both wintering and breeding grounds is important to understand the mechanism of phenological shifts
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