Sökning: "sexual ornament"

Hittade 4 uppsatser innehållade orden sexual ornament.

  1. 1. Behaviour and morphology in wild guppies from populations with high and low predation pressure in Trinidad

    Master-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :William Harry Ashworth; [2020]
    Nyckelord :behavioural ecology; colouration; Poecilia reticulata; sexual ornament;

    Sammanfattning : Behaviour and morphology can vary significantly within a species as a result of the predation pressure individuals are exposed to. Wild populations of guppies (Poecilia reticulata) exposed to high and low predation can be found in the streams of northern Trinidad, providing a useful study system for investigating how behaviour and morphology are affected by predation. LÄS MER

  2. 2. Parasite burden and reproductive success

    Kandidat-uppsats, SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Författare :Monica Höjerslev; [2018]
    Nyckelord :parasiter; parasitbelastning; reproduktion; reproduktionsframgång; sexuella signaler; ornament;

    Sammanfattning : Reproduction is fundamental for passing on genes and secure species survival. One crucial point of this is mate choice, mating with an unbeneficial partner, they risk less advantageous offspring than if a better mate had been chosen. To be able to make these choices, sexual signals, or ornaments, are very useful tools. LÄS MER

  3. 3. Malaria infected male collared flycatchers, Ficedula albicollis experience higher reproductive success and tend to have larger sexual ornaments

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :William Jones; [2016]
    Nyckelord :Ficedula; Avian malaria; sexual selection;

    Sammanfattning : How parasites influence the population dynamics of their hosts depends on 1) theproportion of individuals that carry the infection in the population, 2) what type of individuals aremost susceptible to infection and 3) the fitness effects of infection. In this study I first investigate thefrequency of malaria strains transmitted in the African winter quarters or at the European breedinggrounds in collared flycatchers (Ficedula albicollis). LÄS MER

  4. 4. The honesty of the female sexual ornament in Gallus gallus

    Master-uppsats, Linköpings universitet/Zoologi

    Författare :Sara Rydmell; [2010]
    Nyckelord :AIL; comb; egg; fecundity; female ornamentation; honest; QTL;

    Sammanfattning : Sexual selection was defined by Darwin in 1871 as selection acting solely on reproduction success. It is known to act on males resulting in extravagant ornamentations or other attributes, but in recent years more studies have shown that sexual selection also act on females. LÄS MER