Sökning: "sexual dimorphism"

Visar resultat 6 - 10 av 14 uppsatser innehållade orden sexual dimorphism.

  1. 6. Sexual dimorphism in the migratory dynamics of a land-locked population of brown trout (Salmo trutta) in central Sweden : a study at three temporal scales

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Carl Vigren; [2018]
    Nyckelord :trout; salmonid; salmo; trutta; migration; upstream; Storsjon; Storsjön; Damman; Dammån; regulated; fish ladder; behaviour; protandry;

    Sammanfattning : In this study I use a 56 years long dataset to study the migratory behaviours of a land-locked population of Brown trout (Salmo trutta) in the river Dammån, positioned in central Sweden. I found that there was a mean female-to-male sex ratio in the spawning-run of approximately 2.31 with an average 50% run date on the 29th of July. LÄS MER

  3. 7. Age dependent costs of reproduction in a sexually dimorphic species : male fallow deer as an example

    Master-uppsats, SLU/Dept. of Ecology

    Författare :Linn Lindström; [2017]
    Nyckelord :dama dama; cost of reproduction; home range size; sexual dimorphism;

    Sammanfattning : Energy and time are two of the most important factors limiting the investment spent on reproduction for an organism. Due to this limitation, individuals have to balance between using energy for maintenance or growth and using it for reproduction. LÄS MER

  4. 8. Sexual selection and extinction in deer

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Saloume Bazyan; [2013]
    Nyckelord :Sexual selection; Extinction; Cervidae; Size dimorphism; mating system;

    Sammanfattning : By performing a comparative analysis and using phylogenetic relationships of the Cervidaefamily this study aimed to address whether or not sexual selection may play a role in the extinctionof species by making species more vulnerable to extinction. The role of sexual selection in makingspecies more vulnerable to extinction is largely unexplored, and several factors such as ecologicaland life history traits may increase the risk of extinction. LÄS MER

  5. 9. Effects of domestication on social support in chickens (Gallus gallus)

    Kandidat-uppsats, Institutionen för fysik, kemi och biologi; Tekniska högskolan

    Författare :Rebecca Katajamaa; [2012]
    Nyckelord :Social support; White Leghorn; red junglefowl; domestication; social behaviour;

    Sammanfattning : Social support is thought to give animals benefits from social partners, such as improved coping with challenges. The aim of this study was to investigate differences in social support in the red junglefowl (RJF) and a domestic layer strain, the White Leghorn (WL). LÄS MER

  7. 10. Impact of a maternal high-fat diet on mouse placental epigenetic programming

    Master-uppsats, SLU/Dept. of Animal Breeding and Genetics

    Författare :Bahriye Karakas; [2011]
    Nyckelord :epigenetic; high-fat diet; placenta; DOHaD; sexual dimorphism;

    Sammanfattning : OBJECTIVE: To assess how nutrient intakes of mouse mothers during pregnancy influence placental and fetal growth, we fed pregnant mother with a high-fat diet (HFD) and collect fetus and placentas in the middle of fetal period and at term. MATERIAL and METHODS: We studied gene expression by RT-qPCR and DNA methylation by LUMA to understand the molecular mechanisms of placental epigenetic programming in the labyrinth layer of the placenta, where nutrient exchanges take place. LÄS MER