Sökning: "freshwater and marine ecology Ethology and behavioural ecology"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden freshwater and marine ecology Ethology and behavioural ecology.

  1. 1. Mobility and emigration in butterflies

    Detta är en avhandling från Stockholm : Zoologiska institutionen

    Författare :Karin Enfjäll; Stockholms universitet.; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Keywords: conspecific density; dispersal; evolution; flight-behaviour; information; sexual conflict; social interactions; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : Because of its implications for the survival of many species, dispersal plays a key role in conservation biology. A good knowledge about the different factors that influence dispersal decisions is crucial for the understanding of inter-population movements. LÄS MER

  2. 2. The Evolution of Sexually Homologous Ornaments Selection via Male Mate Choice Coinciding with Male-Male Competition in a Neotropical Mosquito

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Sandra South; Uppsala universitet.; [2011]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sexual selection; Sabethes cyaneus; Diptera; Culicidae; mosquito; mutual ornamentation; sexual selection; mutual mate choice; male mate choice; female ornament; ecology; animal behaviour; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Etologi och beteendeekologi; Zooekologi; Animal Ecology;

    Sammanfattning : The evolution of elaborate male ornaments via sexual selection is well-understood while the selective pressures acting on female ornaments remains unresolved. Female ornaments in species with strong sexual selection on the male homologue of the ornament were originally thought to result from an intersexual genetic correlation. LÄS MER

  3. 3. Predator psychology and mimicry evolution - a theoretical analysis

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Alexandra Balogh; Stockholms universitet.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Müllerian mimicry; two-step evolution; gradual evolution; mutualism; predator psychology; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestrisk; limnisk och marin ekologi Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The evolution of Müllerian mimicry depends on many factors, among which predator psychology is the most important one. Predator avoidance learning, generalization and discrimination are primary selective agents during the evolutionary process. LÄS MER

  4. 4. Evolution of Dispersal and Habitat Exploration in Butterflies

    Detta är en avhandling från Stockholm : Department of Zoology, Stockholm University

    Författare :Ulf Norberg; Stockholms universitet.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The development of wings may be one of the most important reasons for the great diversity among insects. Being able to move makes it possible to colonise new areas and explore resources in the surroundings. However, developing dispersal-related traits, like wings or flight muscles, is costly and moving can also be dangerous. LÄS MER

  5. 5. Food choice in fallow deer – experimental studies of selectivity

    Detta är en avhandling från Stockholm : Zoologiska institutionen

    Författare :Ulrika Alm Bergvall; Stockholms universitet.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; behavioural syndrome; neighbour contrast defence; neighbour contrast susceptibility; simultaneous negative contrast; plant secondary compounds; tannins; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Ethology and behavioural ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : In this thesis, I experimentally investigate feeding selectivity in fallow deer (Dama dama), with respect to plant secondary compounds, especially tannins, which can decrease the quality of foods. I found that fallow deer avoided foods with higher amounts of tannic acid and Quebracho tannin, even though the deer ate some high-tannin food. LÄS MER