A5049590749- Animal Behavior and Reproduction
- Avian ecology and behavior
- Plant and animal studies
- Wildlife Ecology and Conservation
- Animal Vocal Communication and Behavior
- Bird parasitology and diseases
- Ecology and Vegetation Dynamics Studies
- Species Distribution and Climate Change
- Animal Ecology and Behavior Studies
- Evolutionary Psychology and Human Behavior
- Climate variability and models
- Genetic diversity and population structure
- Fish Ecology and Management Studies
- Marine animal studies overview
- Primate Behavior and Ecology
- Amphibian and Reptile Biology
- Insect and Pesticide Research
- Genomics and Phylogenetic Studies
- Genetic and phenotypic traits in livestock
- Animal Nutrition and Physiology
- Neuroendocrine regulation and behavior
- Marine and fisheries research
- Evolutionary Game Theory and Cooperation
- Wildlife Conservation and Criminology Analyses
- Marriage and Sexual Relationships
University of Oslo
2016-2025
University of Saskatchewan
2017
Norwegian University of Science and Technology
1982-1983
Vitensenteret i Trondheim
1981
Abstract Using data from the field and literature on 67 species of birds, we analyzed intraclutch variation in egg size, especially deviation last clutch mean (D). Values D are closer to zero precocial than altricial species; is negatively correlated with body size interspecific comparisons, i.e. large including species, lay small final eggs; higher open-nesting passerines (on average = +3.56%, 17 species) hole-nesting -0.05%, 13 species). Within populations a negative relationship exists...
Abstract For over 50 years, the great tit ( Parus major ) has been a model species for research in evolutionary, ecological and behavioural research; particular, learning cognition have intensively studied. Here, to provide further insight into molecular mechanisms behind these important traits, we de novo assemble reference genome whole-genome re-sequence another 29 individuals from across Europe. We show an overrepresentation of genes related neuronal functions, regions under positive...
In many polygynous birds the reproductive success of females is strongly dependent on male parental care, and mated with same will compete for a limited amount assistance. Mated may benefit from trying to prevent or delay settlement other females. Hence, female aggression affect mating thus play role in evolution avian systems. We present modified version polygyny threshold model that takes into account. A review aggression, allocation delayed breeding secondary supports model. An...
Etude menee en 1982-83 a Trondheim, Norvege, dans un bois lequel ont ete places 440 nichoirs artificiels. Le succes reproducteur de Parus major lors d'une nouvelle tentative nidification depend du degre d'effort parental deja implique une initiale
The plumage colour of nestling and adult Great tits Parus major L. was studied at Trondheim (63 °N, 10 °E), Norway. Nestlings reared in deciduous woodland were yellower than those coniferous woodland, 1983 1982, the later breeding season they more yellow were. Furthermore, adults nestlings, for both groups males females. Experimental interchange eggs between nests showed that variation observed broods related primarily to food not genetic differences. Sampling, by neck‐collar method, brought...
We briefly review the literature on social learning in birds, concluding that strong evidence exists mainly for predator recognition, song, mate choice and foraging. The mechanism of local enhancement may be more important than imitation birds to forage, but former sufficient faithful transmission depending ecological circumstances. To date, most insights have been gained from captivity. present a study foraging two passerine wild, where we cross-fostered eggs between nests blue tits,...
Summary 1. Climate warming has led to shifts in the seasonal timing of species. These can differ across trophic levels, and as a result, predator phenology get out synchrony with prey phenology. This have major consequences for predators such population declines owing low reproductive success. However, interactions are likely between habitats, resulting differential susceptibility populations increases spring temperatures. A mismatch breeding food abundance might be mitigated by dietary...
A major aim of evolutionary biology is to understand why patterns genomic diversity vary within taxa and space. Large-scale studies widespread species are useful for studying how environment demography shape divergence. Here, we describe one the most geographically comprehensive surveys variation in a wild vertebrate date; great tit (Parus major) HapMap project. We screened ca 500,000 SNP markers across 647 individuals from 29 populations, spanning ~30 degrees latitude 40 longitude - almost...
Sexual–selection theories generally assume that mating preferences are heritable traits. However, there is substantial evidence the rearing environment may be important for development of preferences, indicating they learnt, or modified by experience. The relative importance such sexual imprinting across species remains largely unexplored. Here, we report results a large–scale cross–fostering experiment in wild which nestling birds were raised parents different species. We show resulting...
Field experiments were designed to examine the effects of parental ability on clutch size, for two sexes separately. To handicap we removed feathers from wings and tail three tit species (Parus spp.) during initial incubation period. We then their first clutches, examined effect subsequent nesting. In Blue Tits (P. caeruleus), Coal ater), handicapped females reduced size repeat more than control females. fed young at a lower rate, lost body mass nestling period, fledging time broods...
A cornerstone of ecological theory is the niche. Yet little known about how individuals come to adopt it: whether it innate or learned. Here, we report a cross-fostering experiment in wild where transferred eggs blue tits, Cyanistes caeruleus, nests great Parus major, and vice versa, quantify consequences being reared different social context, but an environment otherwise natural birds. We show that early learning causes shift feeding niche direction foster species this lasts for life...
Breeding strategy of an open—nesting passerine bird, the Fieldfare (Turdus pilaris) was studied in a woodland Norway during four successive breeding seasons. Most birds laid clutches five or six eggs; only 1% more than six. For 100 nests, eggs and/or chicks were added to raise final number seven hatchlings. Parents that clutch showed equal skill raising broods seven, as did those who In enlarged broods, when small age differences existed among hatchlings, their survival rate higher...
Climate change will affect the population dynamics of many species, yet consequences for long-term persistence populations are poorly understood. A major reason this is that density-dependent feedback effects caused by fluctuations in size considered independent stochastic variation environment. We show an interplay between winter temperature and density can influence a small passerine under global warming. Although warmer winters favor increased mean size, cause local to be less buffered...