A5037264696- Avian ecology and behavior
- Animal Behavior and Reproduction
- Plant and animal studies
- Wildlife Ecology and Conservation
- Ecology and Vegetation Dynamics Studies
- Bird parasitology and diseases
- Species Distribution and Climate Change
- Genetic and phenotypic traits in livestock
- Animal Ecology and Behavior Studies
- Fish Ecology and Management Studies
- Insect and Arachnid Ecology and Behavior
- Neurobiology and Insect Physiology Research
- bioluminescence and chemiluminescence research
- Marine and fisheries research
- Physiological and biochemical adaptations
- Demographic Trends and Gender Preferences
- Amphibian and Reptile Biology
- Photoreceptor and optogenetics research
- Evolution and Genetic Dynamics
- Evolutionary Psychology and Human Behavior
- Genetic diversity and population structure
- Fire effects on ecosystems
- Rangeland Management and Livestock Ecology
- Climate variability and models
- Entomological Studies and Ecology
University of Groningen
2013-2024
Netherlands Institute of Ecology
2016
Computational Physics (United States)
2014
Centre for Ecological Research
2009
Google (United States)
2006
Zoological Institute
2001
Association for Asian Studies
2001
University of Oxford
2001
Tinbergen Institute
1986-2000
In seasonal environments, the main selection pressure on timing of reproduction (the ultimate factor) is synchrony between offspring requirements and food availability. However, initiated much earlier than time maximum requirement offspring. Individuals should therefore start in response to cues proximate factors), available environment reproductive decision making, which predict later selection. With increasing spring temperatures over past decades, vegetation phenology has advanced, with a...
Individual animals differ in the way they cope with challenges their environment, comparable variation human personalities. The proximate basis of personality traits has received considerable attention, and one general finding is that have a substantial genetic basis. This poses question how maintained natural populations. We show selection on trait high heritability fluctuates across years within bird population. Annual adult survival was related to this (behaviour novel environments) but...
1) The aim of this paper is to estimate the shape curve relating first year survival nestling weight in individual great tits (Parus major) and study causality relationship.(2) Data were collected a mainland an island population.Nestlings weighed sexed nest when 2 weeks old.A recapture programme provided data for recapture-rate estimates winter.Local until next breeding season was estimated by capturing population.Brood-size manipulation experiments performed population order manipulate...
Summary Intraspecific variation in reproductive decisions is generally considered as a reaction to environmental circumstances. We show that parameters also covaries with intraspecific personality. During 4 years, we studied natural population of great tits association personality trait: exploratory behaviour measured novel environment. Nest success, fledgling size and condition were all correlated this trait. Slow‐exploring females had higher nest success largest fledglings. Fledgling was...
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...
Seasonal variation in reproductive success is a common feature of most organisms. To understand the evolution breeding seasons and strategies individual animals, it necessary to assess extent which seasonal causally related environment ('timing' hypothesis), differences quality between early late breeders or their territories ('quality' combination both. We manipulated timing Great Tit Parus major, small passerine, test these hypotheses. A group experimentally delayed birds was created by...
Six seasons of field work on the Dutch island Schierminnikoog were devoted tot testing hypothesis that parent Starlings conform to principle caloric maximization in their choice prey and hunting site as would be predicted by profitability concept Royama. ...Zie: Saummary
Abstract The theory that individual birds maximize their fitness by the two major decisions in reproduction concerning date (when to start laying eggs) and clutch size stop is empirically approached Kestrel quantifying Fisher's Reproductive Value for both (Vc = c. Vo/2) parents (Vp). reproductive value of an egg (Vo) was found decrease monotonically with (d) due significant associations d components So (probability survive till fledging), S1 from fledging age 1), S2 (survival 1 2), P1...
SUMMARY (1) We investigated experimentally whether timing of reproduction is causally involved in the seasonal decline reproductive success great tit Parus m. major L. This important because its implications for optimization decisions individual bird. (2) Timing breeding was manipulated by inducing repeat clutches through removal first clutch. The experiment performed 1987 two forests (W and 0) followed up year after. It assumed that parental quality unaffected ex-periment. Reproductive...
Polymorphisms in the dopamine receptor D4 gene (DRD4) have been related to individual variation novelty-seeking or exploratory behaviour a variety of animals, including humans. Recently, human DRD4 orthologue was sequenced wild bird, great tit (Parus major) and single nucleotide polymorphism exon 3 this (SNP830) shown be associated with lab-raised individuals originating from population. Here we test generality finding large sample free-living four European populations, originally sampled We...
Climate change affects both the mean and variability of climatic variables, but their relative impact on dynamics populations is still largely unexplored. Based a long‐term study demography declining Eurasian Oystercatcher ( Haematopus ostralegus ) population, we quantify effect changes in variance winter temperature different vital rates across life cycle. Subsequently, quantify, using stochastic stage‐structured models, how this environmental variable affect important characteristics...
1. In birds with bi‐parental care, handicapping is often assumed to decrease the amount of parental care handicapped partner. We discuss how could alter shape bird's survival–effort curve (theoretical relating survival a parent its effort) and show that optimal response yield decrease, no or even an increase in effort bird. 2. Male female great tits Parus major (L.) were during nestling period by clipping number feathers order study effects on body condition. 3. Handicapped males...
1. Quantification of the energetic needs reproducing animals provides a basis for understanding patterns in reproduction. The doubly labelled water technique enables this to be carried out under natural conditions. 2. Daily energy expenditure 32 female Great Tits (Parus major) tending nestlings 11-12 days old (DEE(par)) and at night five females was measured using technique. 3. Average DEE(par) 95.1 kJ (24 h)-1 (1.10 W) close most predictions based on interspecific allometric relationships....
Abstract Fitness variations due to natural variation in the size of first clutch and its laying date were estimated using Fisher's reproductive value for both (Vc) parent (Vp) a population great tits. In order test hypothesis that individual birds maximize their by choice size, artificial brood was introduced consequences terms estimated. Maximal Vc, computed on basis occurred at 15.2, increased slightly with (Fig. 1A) Vp decreased 1B). The total V (= Vc+Vp) maximal 15.4 1C), substantially...
Life-history theory predicts that parents produce the number of offspring maximizes their fitness. In birds, natural selection on parental decisions regarding clutch size may act during egg laying, incubation or nestling phase. To study fitness consequences phase, we manipulated sizes this phase only in three breeding seasons and measured short long term. Clutch enlargement did not affect first clutches, but fledging probability subsequent same season was reduced. Parents incubating enlarged...
Individuals of the same species differ consistently in risky actions. Such 'animal personality' variation is intriguing because behavioural flexibility often assumed to be norm. Recent theory predicts that between-individual differences propensity take risks should evolve if individuals future fitness expectations: with high long-term expectations (i.e. have much lose) behave more cautious than lower expectations. Consequently, any manipulation result within-individual changes behaviour...
A brood manipulation experiment on great tits Parus major was performed to study the effects of nestling age and size parental care offspring survival. Daily energy expenditure (DEE) females feeding nestlings 6 12 days measured using doubly-labeled water technique. Females adjusted their brooding behavior young. The data are consistent with idea that determined primarily by thermoregulatory requirements brood. Female DEE did not differ age; when differences in body mass were controlled for,...
We test the predictive value of main energetic currencies used in foraging theory using starlings that choose between two modes (walking versus flying). Walking is low-cost, low-yield, whereas flying opposite. fixed experimentally, at 11 different values, amount flight required to get one food reward, and for each cost value, we titrated walking until birds showed indifference modes. then compared points those predicted by gross rate gain over time, net ratio expenditure (efficiency). The...
Foraging adaptations include behavioral and physiological responses, but most optimal foraging models deal exclusively with decision variables, taking other dimensions as constraints. To overcome this limitation, we measured responses of European starlings Sturnus vulgaris to changes in food availability a laboratory environment. The birds lived closed economy choice two modes (flying walking) were observed under treatments (hard easy) that differed the work required obtain food. Comparing...
Temporal variation in survival, fecundity, and dispersal rates is associated with density-dependent density-independent processes. Stable natural populations are expected to be regulated by factors. However, detecting this investigating density difficult because independent factors affecting population dynamics may covary. Therefore, experiments needed assess the dependence of demographic rates. In study, we investigate effect on Seychelles Warbler (Acrocephalus sechellensis). This species,...
Summary 1. To elucidate the links between avian brood size, parental effort and investment, we measured daily energy expenditure (DEE fem ), condition (residuals of mass on tarsus) feeding rate in female great tits Parus major L. rearing broods which number young was either reduced, unmanipulated or enlarged. 2. Female negatively correlated with manipulation when at nestling age 8 days (measured during day), suggests a shift allocation from self‐feeding to chick‐feeding. However, there no...