Sökning: "ontogeni"

Hittade 4 uppsatser innehållade ordet ontogeni.

  1. 1. Play behaviour in Urial (Ovis orientalis bocharensis) lamb

    Master-uppsats, SLU/Dept. of Animal Environment and Health

    Författare :Irene Guanyabens Garrido; [2018]
    Nyckelord :play behaviour; ural lamb;

    Sammanfattning : Welfare constitutes of health, physiology, behaviour and reproduction. It becomes very important when a species suffers in any of these parameters and thus, the assessment of welfare should be carried out. Play behaviour has been identified as a positive behaviour performed when satisfactory circumstances are present. LÄS MER

  3. 2. Embryologi och tidig ontogeni hos mesozoiska fisködlor (Ichthyopterygia)

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Susanna Perneby Molin; [2016]
    Nyckelord :fisködlor; embryo; ontogeni; jura; Holzmaden; Earth and Environmental Sciences;

    Sammanfattning : Ichthyosaurs (‘fish lizards’) are a group of marine reptiles that lived during the Mesozoic Era. They are all included in the superorder Ichthyopterygia, which consists of at least 36 genera and 80 species. LÄS MER

  4. 3. Variation in number of vertebrae in populations of pike (Esox lucius) in the south-east of Sweden

    Kandidat-uppsats, Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Författare :David Alvunger; [2016]
    Nyckelord :Ecology; Esox lucius; evolution; meristic characters; pleomerism; selection;

    Sammanfattning : Antalet ryggkotor varierar kraftigt mellan olika taxa, men också inom arter eller populationer. Omfattande forskning har visat att antalet ryggkotor hos fisk är resultatet av interaktioner mellan genetisk struktur och plastiska svar på miljöbetingelser under individens ontogeni. LÄS MER

  5. 4. Osteo-histology of Mesozoic marine tetrapods : implications for longevity, growth strategies and growth rates

    Kandidat-uppsats, Lunds universitet/Geologiska institutionen

    Författare :Johan Gren; [2010]
    Nyckelord :histologi; mesozoiska tetrapoder; livslängd; tillväxtstrategier; osteoporos; pachyosteosclerosis; histology; Mesozoic tetrapods; longevity; growth strategies; osteoporosis; Earth and Environmental Sciences;

    Sammanfattning : Osteo-histology provides information on age, growth strategies, and lifestyles of both recent and ancient animals. This study deals with the histology of fossilized bone from three groups of tetrapods – sea turtles, ichthyosaurs and plesiosaurs – all secondarily adapted to marine life, but with rather different bone microstructures. LÄS MER