Search for dissertations about: "Zoology"

Showing result 6 - 10 of 440 swedish dissertations containing the word Zoology.

  2. 6. Celestial Orientation in Dim Light

    Author : Marie Dacke; Funktionell zoologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; polarisation pattern; moon; polrised light detection; twilight; dim light; dung beetle; Zoologi; spider; vision; orientation; Zoology;

    Abstract : The polarization pattern of skylight offers many animals a reference for visual compass orientation. In those cases when this optical compass is identified, the receptors involved are often confined to a small part of an eye built predominantly for other visual tasks. READ MORE

  4. 7. Chemical communication in mating shore crabs Carcinus maenas

    Author : Mattias Ekerholm; Biologiska institutionen; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Zoology; Urine communication; Behavior; Spatial scale; Male pheromone; Primer pheromone; Zoologi; Olfaction;

    Abstract : Locating and evaluating a suitable partner for mating is one of the most important events in any sexually reproducing organism. To achieve this, an animal must be able to locate its partner over both long and short distances, and finally evoke the proper mating behaviour. READ MORE

  5. 8. Alloparental care and social dynamics in the fallow deer (Dama dama)

    Author : Kenneth Ekvall; Rory Putman; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; zoologi; Zoology;

    Abstract : In mammals, a sex difference exists in natal dispersal with females remaining in the natal area and males generally leaving the area of birth. Female groups are regarded as the basic social unit of many mammalian species, and in species with overlapping generations groups may develop a matrilineal structure. READ MORE

  6. 9. Development of photoreceptor organs in teleosts, Molecular and immunocytochemical studies

    Author : Johan Forsell; Tumörmikromiljö; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fish; opsin; extraretinal; retina; Development; pineal organ; Zoology; Zoologi;

    Abstract : Many vertebrate animals are known to have multiple sites for photoreception that are not involved in vision. Extraretinal photoreception is indicated to play a crucial role in early development, physiology and behavior, as well as in later biological processes. READ MORE

  7. 10. Time and energy in long-distance bird migration

    Author : Thord Fransson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; zoologi; Zoology;

    Abstract : Long-distance seasonal migration is energetically demanding and time consuming. For example, some passerine birds are on migration during six months of the year, travel more than 10 000 km and make use of many fuelling sites. Migration requires many different decisions, and an individual bird will face a variety of situations. READ MORE