Sökning: "Natal"

Visar resultat 16 - 20 av 80 avhandlingar innehållade ordet Natal.

  1. 16. Life history decisions in a changing environment : A long-term study of a temperate barnacle goose population

    Författare :Henk van der Jeugd; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Age at first reproduction; Barnacle goose; Branta leucopsis; Coloniality; Dispersal; Life-history; Mate choice; Population dynamics; Survival; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

    Sammanfattning : This thesis shows that climate and increasing population density have profound effects on survival, age at first reproduction, and natal dispersal in a rapidly increasing temperate barnacle goose Branta leucopsis population on Gotland, Sweden.Colony size was found to be the most important fitness-determinant because of strong density-dependent effects on reproduction. LÄS MER

  3. 17. Cooperative Breeding in the Southern Anteater-Chat : Sexual Disparity, Survival and Dispersal

    Författare :Jonathan Barnaby; Jan Ekman; Anssi Laurila; Rita Covas; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Southern anteater-chat; Myrmecocichla formicivora; cooperative breeding; social evolution; behavioural ecology; delayed dispersal; family living; Africa; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Sammanfattning : Group-living sets the scene for complex social behaviours such as cooperative breeding, and exploring the factors that shape group-living is crucial in understanding these behaviours. This thesis explores the ecology of a population of the facultative cooperative breeding southern anteater-chat (Myrmecocichla formicivora), a group-living bird species endemic to southern Africa. LÄS MER

  4. 18. Interaction between dispersal and behavioural syndromes - empirical approach in a fragmented population of passerine birds

    Författare :Gregory Daniel; Blandine Doligez; Lars Gustafsson; Thierry Boulinier; Uppsala universitet; []
    Nyckelord :dispersal; behavioural syndromes; heritability; personality traits; neophobia; aggressiveness; risk-taking behaviour; collared flycatcher; Ficedulla albicollis; dispersion; syndromes comportementaux; héritabilité; traits de personnalité; néophibie; aggressivité; prise de risque; gobemouche à collier; Ficedulla albicollis; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : Dispersal is a key life history trait for ecological and evolutionary processes in wild populations. The latest research has particularly focused on the correlation between behavioural traits and dispersal, in order to emphasize the existence of behavioural syndromes of dispersal, and on the estimation of the genetic basis of the dispersal behaviour. LÄS MER

  5. 19. Macrophages and neutrophils in tissue homeostasis and recovery from ischemic injury

    Författare :Kristel Parv; Mia Phillipson; Gustaf Christoffersson; Per-Ola Carlsson; Stephen Jenkins; Uppsala universitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; macrophages; neutrophils; hindlimb ischemia; ischemic disease; mural cells; diabetes mellitus; postnatal β cell maturation.;

    Sammanfattning : Neutrophils and macrophages have functions beyond protection against pathogens. The overall aim of the work presented in this thesis was to identify novel tasks for these innate immune cells in maintaining homeostasis. LÄS MER

  7. 20. The Nepotistic Parent; Predator Protection, Kinship and Philopatry

    Författare :Michael Griesser; Jan Ekman; Ronald Mumme; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biology; referential alarm calls; delayed dispersal; nepotism; vigilance; alarm calling; mobbing; extended parental care; families; Perisoreus infaustus; Siberian jay; Biologi; Biology; Biologi; populationsbiologi; Population Biology;

    Sammanfattning : Evolution is fuelled by independent reproduction events. Yet, the offspring of at least three percent of all bird species postpone dispersal and forego independent reproduction. LÄS MER