Sökning: "immunocompetence"

Visar resultat 1 - 5 av 15 avhandlingar innehållade ordet immunocompetence.

1. 1. 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

3. 2. Avian malaria, life-history trade-offs and interspecific competition in Ficedula flycatchers

   Författare :Katarzyna Kulma; Anna Qvarnström; Marlene Zuk; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Blood parasites; competitive asymmetry; immunocompetence; interspecific competition; life-history trade-offs; MHC; parasite-driven selection;

   Sammanfattning : This thesis investigates the impact of avian malaria (Haemosporidia) parasites on the outcome of interspecific competition between two closely related bird species, pied (Ficedula hypoleuca) and collared (F. albicollis) flycatchers. LÄS MER

4. 3. Development and maintenance of quality indicators in pheasants

   Författare :Thomas Ohlsson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PHA; ELISA; immunocompetence; carotenoid coloration; male ornaments; fluctuating asymmetry; growth; early development; Phasianus colchicus; egg size; sexual selection; Animal ecology; Djurekologi; Ecology; Ekologi;

   Sammanfattning : Females often base their choice of mates on the expression, size or intensity, of male sexual ornaments. Indicator models of sexual selection assume that females assess male genetic quality through the expression of these secondary sexual characters. LÄS MER

5. 4. Costs in the ecology and evolution of the vertebrate immune system

   Författare :Lars Råberg; MEMEG; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cost of resistance; ecological immunology; immunocompetence; Parus caeruleus; transgenic mice; Animal ecology; Djurekologi; blue tit; basal metabolic rate;

   Sammanfattning : A central assumption of theories of the ecology and evolution of immunological defence is that defence has not only benefits (in the form of resistance against parasites), but also costs. The aim of my studies was to investigate the nature and magnitude of costs of the vertebrate immune system, and to examine some of the consequences of these costs. LÄS MER

7. 5. Ecological genetics of inbreeding, outbreeding and immunocompetence in Ranid frogs

   Författare :Jörgen Sagvik; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Using artificial fertilization, I crossed frogs from different populations to evaluate fitness consequences for the offspring from an inbreeding-outbreeding perspective, and to evaluate quantitative genetic effects on immunocompetence against a fungal pathogen (Saprolegnia). Crosses between closely situated populations of different sizes generated contrasting results for the effects of outbreeding on offspring traits between populations and life history stages, emphasizing the importance of epistatic effects and the difficulties of relying on generalizations when making conservation decisions (e. LÄS MER