Avancerad sökning
Hittade 5 uppsatser som matchar ovanstående sökkriterier.
1. Differences in velocity between the sexes and stages of courtship in a dance fly
Master-uppsats, Göteborgs universitet / Institutionen för biologi och miljövetenskapSammanfattning : Dance flies (Diptera: Empididae: Empidinae) are famous for their elaborate mating behaviour, which can be broken down to three distinct stages in adults: hunting, swarming, and mating. In many species, males hunt for prey that they present as nuptial gifts to recipient females in swarms, after which the pair will copulate in the air or after landing on nearby vegetation. LÄS MER
2. Behaviour and morphology in wild guppies from populations with high and low predation pressure in Trinidad
Master-uppsats, SLU/Dept. Of Aquatic ResourcesSammanfattning : 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
3. Parasite burden and reproductive success
Kandidat-uppsats, SLU/Dept. of Biomedical Sciences and Veterinary Public HealthSammanfattning : 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
4. 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 grundutbildningSammanfattning : 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
5. The honesty of the female sexual ornament in Gallus gallus
Master-uppsats, ZoologiSammanfattning : 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
