Sökning: "breeding experience"

Visar resultat 1 - 5 av 12 avhandlingar innehållade orden breeding experience.

1. 1. Early Experience, Maternal Care and Behavioural Test Design : Effects on the Temperament of Military Working Dogs

   Författare :Pernilla Foyer; Per Jensen; Martin Norsell; Daniel Mills; Försvarshögskolan; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Early experience; Maternal care; Dog; Military Working Dog; Behaviour; Temperament test; Stress; Försvarssystem; Military Technology;

   Sammanfattning : Domestication has resulted in animals with broad variations between as well as within breeds, which allows for the selection and breeding of animals for preferred traits. This selection has affected both the genotypes and phenotypes of animals. LÄS MER

3. 2. Age, Longevity and Life-History Trade-Offs in the Collared Flycatcher (Ficedula albicollis)

   Författare :Joanna Sendecka; Lars Gustafsson; Anna Qvarnström; Pat Monaghan; Uppsala universitet; []
   Nyckelord :Ecology; age; collared flycatcher; Ficedula albicollis; long-term study; senescence; longevity; reproductive success; selection; individual quality; breeding experience; reproductive effort optimization; terminal investment; life-history trade-offs; reproductive costs; Ekologi;

   Sammanfattning : Age is often a neglected factor in ecological studies. However, age-related changes in reproduction and survival of organisms may strongly influence population dynamics. LÄS MER

4. 3. Life History of the Common Gull (Larus canus) : A Long-Term Individual-Based Study

   Författare :Kalev Rattiste; Mats Björklund; Jon E Brommer; Jan-Åke Nilsson; Uppsala universitet; []
   Nyckelord :Ecology; longitudinal studies; reproductive success; survival; pair bond; indicator trait; breeding time; heritability; selection; Ekologi; Larus canus; ekologisk botanik; Ecological Botany;

   Sammanfattning : An individual’s life history is a sequence of events which eventually determine its contribution to the next generation, or fitness. These events are affected by environmental factors, genetic make-up and decisions made by an individual and its breeding partner. LÄS MER

5. 4. Genetic and Ecological Consequences of Fish Releases : With Focus on Supportive Breeding of Brown Trout Salmo trutta and Translocation of European Eel Anguilla anguilla

   Författare :Johan Dannewitz; Jacob Höglund; Erik Petersson; Ian Fleming; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; conservation; fishery management; panmixia; genetic variation; effective population size; hatchery selection; Biologi; Biology; Biologi;

   Sammanfattning : Although the practice of releasing fish into the wild is common in the management and conservation of fish populations, the success of release programmes and the potential harmful genetic and ecological effects that may follow are rarely considered. This thesis focuses on genetic and ecological consequences of fish releases, exemplified by supportive breeding of brown trout (Salmo trutta) and translocation of European eel (Anguilla anguilla). LÄS MER

7. 5. Avian migration: the role of geomagnetic cues

   Författare :Ian Henshaw; Cecilia Kullberg; Thomas Alerstam; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; geomagnetic cues; orientation; food intake; fuel deposition; corticosterone; endogenous time program; bird migration; Biology; Biologi; etologi; Ethology;

   Sammanfattning : The regularity and scale of bird migrations has impressed mankind for generations. Birds rely on an inherited migratory program to guide them during the journey; however, recent evidence suggests that additional external cues are necessary. LÄS MER