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Article
Cecilia Kullberg, Auteur ; Thord Fransson, Auteur ; Johanna Hedlund, Auteur ; Niclas Jonzén, Auteur ; Ola Langvall, Auteur ; Johan Nilsson, Auteur ; Kjell Bolmgren, AuteurDans AMBIO (44 JAN 2015)Many migratory bird species have advanced their spring arrival during the latest decades, most probably due to climate change. However, studies on migratory phenology in the period before recent global warming are scarce. We have analyzed a hist[...]
Article
Gunnar Gunnarsson, Auteur ; Jonas Waldenström, Auteur ; Thord Fransson, AuteurTo understand population dynamics it is necessary to understand vital rates, which may be affected by a wide range of factors including environmental variables such as weather. Weather conditions can affect birds vital rates directly through inc[...]
Article
Thord Fransson, Auteur ; Mans Karlsson, Auteur ; Cecilia Kullberg, Auteur ; Robert Stach, Auteur ; Christos Barboutis, AuteurMigratory birds wintering in Africa face the challenge of passing the Sahara desert with few opportunities to forage. During spring migration birds thus arrive in the Mediterranean area with very low energy reserves after crossing the desert. Si[...]
Article
K. Susanna S. Hall, Auteur ; Thord Fransson, AuteurMigrating passerines moulting in the breeding quarters before autumn migration sometimes end up with less time than needed for a normal moult. To deal with this the birds could for example suspend moult or moult faster. In this paper we investig[...]
Article
Johanna S. U. Hedlund, Auteur ; Sven Jakobsson, Auteur ; Cecilia Kullberg, Auteur ; Thord Fransson, AuteurClimate change can influence many aspects of avian phenology and especially migratory shifts and changes in breeding onset receive much research interest in this context. However, changes in these different life-cycle events in birds are often i[...]
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Thord Fransson, Auteur ; Sven Jakobsson, Auteur ; Cecilia Kullberg, Auteur ; Johan Lind, Auteur ; Adrian Vallin, Auteur
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Christos Barboutis, Auteur ; Ian Henshaw, Auteur ; Moisis Mylonas, Auteur ; Thord Fransson, AuteurThe Sahara desert acts as an ecological barrier for billions of passerine birds on their way to and from their African wintering areas. The Garden Warbler Sylvia borin is one of the most common migrants involved. We used body mass of this specie[...]
Article
Thord Fransson, Auteur ; Christos Barboutis, Auteur ; Roger Mellroth, Auteur ; Triantaphyllos Akriotis, AuteurLarge numbers of passerine migrants cross the Sahara desert every year on their way to-and-from wintering areas in tropical Africa. In the desert, hardly any fuelling opportunities exist and most migrants have to prepare in advance. A central qu[...]
Article
Robert Stach, Auteur ; Thord Fransson, Auteur ; Sven Jakobsson, Auteur ; Cecilia Kullberg, AuteurMigratory birds use stopovers to replenish their fuel reserves and they generally spend more time at stopover sites than they do in actual flight. When arriving at a new stopover site birds may need to search extensively to find a suitable feedi[...]
