Sökning: "zoologi"

Visar resultat 1 - 5 av 484 avhandlingar innehållade ordet zoologi.

1. 1. Celestial Orientation in Dim Light

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

   Sammanfattning : 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. LÄS MER

3. 2. The soft bottom ecosystem of the northern Baltic proper with special reference to the macrofauna

   Författare :Sven Ankar; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zoologi;

   Sammanfattning : .... LÄS MER

4. 3. Flower Cues for Hawkmoths: Colour, Place and Odour

   Författare :Anna Balkenius; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zoologi; Zoology; olfaction; vision; learning; multimodal; Macroglossum stellatarum; Hawkmoth; Deilephila elpenor;

   Sammanfattning : Flowers use different cues to attract pollinators including colour and odour. How do hawkmoths use these cues to find the flowers? This question was investigated in two species of hawkmoth, the diurnal species, Macroglossum stellatarum, and the nocturnal species, Deilephila elpenor. Both species have colour vision and D. LÄS MER

5. 4. Maternal investment in male and female offspring in the fallow deer

   Författare :Björn Birgersson; Kjell Wallin; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal physiology; Zoofysiologi; zoologi; Zoology;

   Sammanfattning : In this thesis, I investigate whether mothers of the polygynous fallow deer, Dama dama, bias their investment towards male offspring. I aim to answer the specific questions: (i) how is offspring fitness related to maternal investment?; (ii) do male fawns grow faster than female fawns during the period of maternal investment, and if so, why?; (iii) are male fawns more costly to raise than female fawns?; (iv) do fallow deer mothers adjust the sex of their offspring in relation to their ability to invest resources? To answer these questions I have collected and analysed data on reproduction of an enclosed fallow deer population and also performed an experimental study in which the level of investment was controlled for. LÄS MER

7. 5. Mechanisms in the photoperiodic control of reproduction in the three-spined stickleback, Gasterosteus aculeatus

   Författare :Cecilia Bornestaf; Hilmar Meissl; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zoologi; Zoology;

   Sammanfattning : .... LÄS MER