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Article
Site fidelity after successful nesting and site shift after nest predation (win–stay, lose–shift) is a well-documented adaptation to spatially heterogeneous and temporally auto-correlated predation risk. However, site shift even after a successf[...]
Article
Rune Sørås, Auteur ; Oda A. Gundersen, Auteur ; Ronny Steen, Auteur ; Geir A. Sonerud, AuteurBirds providing prey with a clumped distribution often return to the previous capture site after having delivered a prey item at the nest. However, details of this foraging tactic are still poorly known, in particular for birds of prey, which of[...]
Article
Katrine Eldegard, Auteur ; Heidi Vognild, Auteur ; Geir A. Sonerud, AuteurThe decision to emigrate from the natal area can influence future fitness prospects, yet detailed data on sex-specific juvenile dispersal behaviour is still lacking for most bird species. We tracked 13 radio-tagged Tengmalm's Owl Aegolius funere[...]
Article
Ronny Steen, Auteur ; Geir A. Sonerud, Auteur ; Tore Slagsvold, AuteurIn altricial birds, parents are assumed to optimize the total food delivery to the brood given the time constraints set by self-feeding and food collecting. Older nestlings may require more food than younger ones, and nestlings may need more ene[...]
Article
Prey delivery rates as estimates of prey consumption by Eurasian Kestrel Falco tinnunculus nestlings
Ronny Steen, Auteur ; Line M. Low, Auteur ; Geir A. Sonerud, Auteur ; Vidar Selås, Auteur ; Tore Slagsvold, AuteurIn altricial birds the type of prey selected by parents for their nestlings may affect the allocation of time and energy spent on hunting, preparing prey and feeding the nestlings, which in turn may affect the rate of provisioning. Raptors take [...]
Article
Tore Slagsvold, Auteur ; Geir A. Sonerud, Auteur ; Helge E. Gronlien, Auteur ; Leif C. Stige, AuteurMost raptors take large prey for their size compared to other birds, but tear the prey apart into small morsels before swallowing. Little is known about how the efficiency of this prey handling varies among raptors, and how it relates to their f[...]
Article
Tore Slagsvold, Auteur ; Geir A. Sonerud, AuteurCompared to other birds, most raptors take large prey for their size, and feeding bouts are extended. However, ingestion rate has largely been overlooked as a constraint in raptors' foraging and breeding ecology. We measured ingestion rate by of[...]
Article
Katrine Eldegard, Auteur ; Geir A. Sonerud, AuteurPost-fledging care constitutes a large proportion of the total costs of parental care in many bird species. Despite being recognized as of critical importance to the survival of the offspring and their recruitment into the breeding population, p[...]
