Sökning: "Biologi med inriktning mot zooekologi"

Visar resultat 11 - 15 av 28 avhandlingar innehållade orden Biologi med inriktning mot zooekologi.

  1. 11. Fishing for Females : Sensory Exploitation in the Swordtail Characin

    Författare :Mirjam Amcoff; Niclas Kolm; Michael Ryan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Sexual selection; Mate choice; Courtship; Sensory bias; Plasticity; Corynopoma riisei; Mulitiple signalling; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : Mate choice plays an important role in sexual selection and speciation. The evolution of mate choice is intriguing in cases where choosy individuals gain little except for genetic material from the mate and where the trait used as a criterion for the choice is costly to its bearer. LÄS MER

  3. 12. On the Effects of Blood Parasites in Wild Birds

    Författare :Peter Halvarsson; Jacob Höglund; Staffan Bensch; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Atoxoplasma; avian malaria; coccidia; Gallinago media; Haemoproteus; Leucocytozoon; parasite prevalence; Passer montanus; Plasmodium; recapture mod-els; survival; Biologi med inriktning mot populationsbiologi; Biology with specialization in Population Biology;

    Sammanfattning : Coccidian and haemoatozoan parasites are commonly occurring endo-parasites in wild birds and prevalence can vary among species and populations. In addition to prevalence studies, parasites are often used to investigate effects on life history traits. LÄS MER

  4. 13. The links between dispersal and individual fitness: correlation or causality? : Exploring mechanisms using correlative and experimental approaches in a passerine bird species, the collared flycatcher

    Författare :Marion Germain; Lars Gustafsson; Emmanuel Desouhan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : Dispersal is commonly defined as the movement of an individual from its natal orprevious breeding site to a new breeding site. Because dispersal involves movements ofindividuals and genes among populations, it is recognized as a key life history trait withstrong effects on many ecological and evolutionary processes such as populationdynamics and genetics but also species spatial distribution or response to brutalenvironmental variations induced by human activities. LÄS MER

  5. 14. Avian Malaria and Interspecific Interactions in Ficedula Flycatchers

    Författare :William Jones; Anna Qvarnström; Rebecca Safran; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ficedula; flycatcher; avian malaria; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : Parasitism is a core theme in ecological and evolutionary studies. Despite this, there are still gaps in our knowledge regarding host-parasite interactions in nature. LÄS MER

  7. 15. Sexual Selection and Adaptation to Novel Environments

    Författare :Ivain Martinossi-Allibert; David Berger; Göran Arnqvist; Lukas Schärer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sexual selection; Environmental change; Sexual conflict; Environmental stress; Adaptation; Adaptive landscape; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : The work included in this thesis aims at exploring the environmental sensitivity of benefits and costs of sexual selection through a combined empirical and theoretical effort, to increase our understanding of the impact of environmental change on sexually reproducing populations.Can sexual selection promote adaptation to novel environments? Sexual selection for good genes should accelerate adaptation by granting higher reproductive success to individuals of high genetic quality. LÄS MER