Sökning: "moult"

Visar resultat 1 - 5 av 16 avhandlingar innehållade ordet moult.

1. 1. Physiological trade-offs in reproduction and condition dependence of a secondary sexual trait

   Författare :Måns S. Andersson; Victor Apanius; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Trade-offs; life history; immune ecology; cost of reproduction; costs of immune response; sexual selection; migration; moult; Newcastle disease; HbA1C; Ficedula albicollis; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

   Sammanfattning : This thesis examines parental condition, how it is traded off against reproduction and how it is displayed in a secondary sexual trait. The studies were performed on nest-box breeding collared flycatchers Ficedula albicollis on the island of Gotland, in the Baltic Sea. LÄS MER

3. 2. Costs, benefits and constraints in the evolution of avian reproductive tactics: a study on the blue tit

   Författare :Erik Svensson; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reproductive timing; selection analysis; natural selection; mate quality; nestlings; sex ratio; DNA-content; flow cytometry; ELISA; BMR; energetics; immunocompetence; immune system; sexual conflict; nestling mortality; thermoregulation; moult; reproductive costs; reproductive effort; Parus caeruleus; blue tit; birds; juvenile survival; laying date; food supply; Animal ecology; Djurekologi;

   Sammanfattning : In this study I have investigated the various factors influencing reproductive tactics among breeding blue tits (Parus caeruleus). The study was carried out in a nestbox-breeding population of marked individuals at the Revinge Area, outside Lund, southern Sweden. LÄS MER

4. 3. Reproduction and moult in pied and collared flycatchers (Ficedula hypoleuca and F. albicollis) : A life-history approach

   Författare :Christer Hemborg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecology; Breeding time; Costs of reproduction; Long-distance migrant; Moult-breeding overlap; Sexual conflict; Survival probability; Ekologi; Terrestrial; freshwater and marine ecology; Terrestisk; limnisk och marin ekologi; Animal Ecology; zooekologi;

   Sammanfattning : This thesis examines the trade-offs between investments in reproduction and self-maintenance (moult) in pied and collared flycatchers (Ficedula hypoleuca and F. albicollis). These two long-distance migratory passerine bird species were studied on the breeding grounds in Fennoscandia and in England. LÄS MER

5. 4. Moult strategies in relation to migration in long-distance migrants

   Författare :Susanna Hall; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Flyttfåglar;

   Sammanfattning : .... LÄS MER

7. 5. Adaptive body regulation in the life history of birds

   Författare :Johan Lind; Theunis Piersma; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ethology and behavioural ecology; Etologi och beteendeekologi; etologi; Ethology;

   Sammanfattning : Birds have been flying on this Earth for around 150 million years and in response to fluctuating environments birds have evolved flexible body regulation. This thesis has investigated costs and adaptations in bird body regulation in different life history stages, namely moult and migration. LÄS MER