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Documents disponibles écrits par cet auteur (9)
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Article
Carla Pimentel, Auteur ; Jan-Ake Nilsson, AuteurThe breeding biology of great tits (Parus major) was studied in two forests of maritime pine (Pinus pinaster) on the west coast of Portugal, 200 km apart: Leiria (north) and Apostica (south). These two forests are located in a transition zone be[...]
Article
Anna L. K. Nilsson, Auteur ; Thomas Alerstam, Auteur ; Jan-Ake Nilsson, AuteurThe knowledge of migration systems in long-distance regular migrants is in many cases extensive. Our understanding of the migratory characteristics of partial migrants, on the other hand, is far more rudimentary. We investigated migratory charac[...]
Article
Anders Enemar, Auteur ; Jan-Ake Nilsson, AuteurReductions in reproductive performance with age have been predicted to result from a general deterioration of performance, i.e. senescence. Variation among species in the onset and rate of this deterioration depends on the age-independent extrin[...]
Article
Johan Nilsson, Auteur ; Thomas Alerstam, Auteur ; Jan-Ake Nilsson, Auteur
Article
Andreas Nord, Auteur ; Marina Lehmann, Auteur ; Ross Macleod, Auteur ; Dominic J. McCafferty, Auteur ; Ruedi G. Nager, Auteur ; Jan-Ake Nilsson, Auteur ; Barbara Helm, AuteurBody temperature (T-b) is a valuable parameter when assessing the physiological state of animals, but its widespread measurement is often constrained by methods that are invasive or require frequent recapture of animals. Alternatives based on au[...]
Article
Johan F. Nilsson, Auteur ; Martin Stjernman, Auteur ; Jan-Ake Nilsson, AuteurIncubation was for a long time considered to be a period of decreased activity and low cost for parents. It was therefore ignored as a potential factor affecting life-history trade-offs in birds. Lately this view has started to change, and studi[...]
Article
Jan-Ake Nilsson, Auteur ; Hans Kallander, AuteurTo evaluate the importance of tree leafing for the start of laying and clutch size of birds, we compared the breeding phenology of great tits Parus major and blue tits P. caeruleus between one coastal and two inland sites in the same geographica[...]
Article
Carla Pimentel, Auteur ; Jan-Ake Nilsson, AuteurSince 1997, a population of the Pine Processionary Moth Thaumetopoea pityocampa exhibited a shifted life cycle in a restricted area of a managed pine forest, at the central west coast of Portugal. Rather than during the regular winter period, la[...]
Article
Hans Kallander, Auteur ; Dennis Hasselquist, Auteur ; Anders Hedenström, Auteur ; Andreas Nord, Auteur ; Henrik G. Smith, Auteur ; Jan-Ake Nilsson, AuteurThis study documents the advancement of laying dates in three species of tits (Paridae) in southernmost Sweden during recent decades, and the absence of a similar response in the pied flycatcher Ficedula hypoleuca. It is based on several differe[...]
