| Titre : | Influence of temperature on the timing of spring arrival and duration of migration in Arctic goose species at a central European stopover site (2018) |
| Auteurs : | Michal Polakowski, Auteur ; Zbigniew Kasprzykowski, Auteur ; Artur Golawski, Auteur |
| Type de document : | Article |
| Dans : | Ornis Fennica (95(1) January, 2018) |
| Article en page(s) : | 32-40 |
| Langues: | Anglais |
| Résumé : | Many birds are advancing their mitatory phenology and arriving earlier at their spring staging areas in response to climate warming. The duration of the spring migration of geese depends on the interaction between feeding conditions and dates. We studied White-fronted Geese Anser albili-ons and Bean Geese Anser fabalis in north-eastern Poland (one of the coldest areas in the country lowlands), where one of the main central European stopover sites for staging geese is the Biebrza Basin White-fronted Goose and Bean Goose first arrival dates (FADs) in north-eastern Poland were negatively related to local mean spring temperature in January March during 1996-2015, hut FADs of both species (median 28 February) neither differed nor advanced significantly. Total numbers of birds in 10-day periods during 2008-2014 were also analysed. The stay duration of both goose species at the Biebrza stopover site (based on 10-day periods during 2008-2014) varied from 5 to 10 10-day periods. Numbers of geese were positively correlated with local mean temperature and depended on ice cover: both these factors govern accessibility to water and foraging grounds. We suggest that, given the area's prevailing harsh weather conditions, temperature seems to be the crucial factor affecting the extent of ice cover as well as plant growth, which in turn affects goose migration phenology. |
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