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On the Adaptive Value of Intraclutch Egg-Size Variation in Birds
TLDR
The results support the view that intraclutch variation in egg size has an ultimate, adaptive value and suggest that birds adopting the "brood-reduction strategy" have a small final egg, particularly those birds with large clutches, whereas birds adopted the " Brood-survival strategy" has a relatively large final egg. Expand
Carotenoids in food chain studies—II. The food chain of Parus SPP. Monitored by carotenoid analysis☆
TLDR
No metabolic structural modifications of the carotenoids of the primary producer occur during this food chain in nestling great tits living in deciduous or spruce forest. Expand
Polygyny in Birds: The Role of Competition between Females for Male Parental Care
TLDR
A modified version of the polygyny threshold model that takes female aggression into account is presented and shows that secondary females generally have a reduced reproductive success compared with simultaneous, monogamous females. Expand
Evolutionary signals of selection on cognition from the great tit genome and methylome
TLDR
The high-quality great tit genome assembly is assembled, showing an overrepresentation of genes related to neuronal functions, learning and cognition in regions under positive selection, as well as increased CpG methylation in these regions. Expand
Climate change, breeding date and nestling diet: how temperature differentially affects seasonal changes in pied flycatcher diet depending on habitat variation.
TLDR
It is suggested that pied flycatchers breeding in oak habitats have greater need to adjust timing of breeding to rising spring temperatures, because of the strong seasonality in their food. Expand
Risk taking during parental care: a test of three hypotheses applied to the pied flycatcher
TLDR
The model predicts that the importance of the reproductive value of the offspring should decrease relative to the harm that offspring would suffer if they were not cared for when the predator type changes from a nest predator to a predator of adults, and when conditions for breeding turn from good to bad. Expand
Clutch size variation in passerine birds: The nest predation hypothesis
TLDR
The hypothesis that a negative relationship exists between clutch size and the probability that the nest will be robbed is tested, using data for passerine birds given in the literature, and a simple model is presented which does not assume that nest predation is dependent on clutch size. Expand
Clutch Size, Nest Size, and Hatching Asynchrony in Birds: Experiments with the Fieldfare (Turdus Pilaris)
TLDR
Breeding strategy of an open—nesting passerine bird, the Fieldfare was studied in a woodland in Norway during four successive breeding seasons, finding that brood reduction in birds may not be adaptive, as argued by Lack and others, but may result from overcrowding. Expand
Prey size and ingestion rate in raptors: importance for sex roles and reversed sexual size dimorphism
TLDR
It is argued that the separate sex roles found in raptors, i.e. the male hunting and the female feeding the young, is a solution of the conflict between the prolonged feeding bouts at the nest, and the benefit of rapid resumption of hunting in general, and rapid return to the previous capture site in particular. Expand
Hormonal Responses to Male‐Male Social Challenge in the Blue Tit Cyanistes caeruleus: Single‐Broodedness as an Explanatory Variable
TLDR
It is suggested that single‐broodedness plays an important role in determining patterns of hormone change and should be considered in future discussions of hormone‐behavior interactions. Expand
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