Search for dissertations about: "birds"

Showing result 6 - 10 of 331 swedish dissertations containing the word birds.

  2. 6. The birds in the Iliad. Identities, interactions and functions

    Author : Karin Johansson; Göteborgs universitet; []
    Keywords : HUMANIORA; HUMANITIES; ancient ornithology; birds; bird symbolism; divination; double motivation; divine intervention; Homer s Iliad; identity; messenger; metaphorical utterances; oral tradition; parallelism; semiotics; species interactions; transformation; transmitter; Trojan war;

    Abstract : As the topic of this study embraces and entwines what is routinely divided into two separate categories, “nature” and “culture”, the birds in the Iliad challenge modern scientific division and in some ways, our thinking. They are simultaneously birds, signs and symbols. READ MORE

  4. 7. Role of birds in the biology of Lyme disease Borrelia

    Author : Åsa Gylfe; Klaus Kurtenbach; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Lyme disease; birds; Borrelia; I. uriae; infection reactivation; stress; bipolar distribution; transequatorial transport;

    Abstract : Lyme disease is a tick-transmitted illness caused by Borrelia burgdorferi sensu lato (s.l.), a group of spirochetes with at least three human pathogenic species, B. burgdorferi sensu stricto, B. READ MORE

  5. 8. On Speciation in Birds – Genomic Signatures across Space and Time

    Author : Martin Stervander; MEMEG; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; colonization; islands; isolation; introgressive hybridization; sympatry; natural selection; bill morphology; coalescence-based analyses; DNA sequencing; birds; divergence; Speciation;

    Abstract : The process of speciation is a cornerstone in evolutionary biology. In Darwin’s On the Origin of Species, he described how he imagined that a new species would evolve to fill an empty niche. This focus on ecology shifted with Mayr towards the importance of isolation, and for many decades the geographic modes of speciation were debated. READ MORE

  6. 9. Spatial Vision in Birds: Anatomical investigation of spatial resolving power

    Author : Mindaugas Mitkus; Funktionell zoologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Raptors; Seabirds; Parrots; Birds; Double cones; Development; Retinal ganglion cells; Visual spatial resolution; Visual ecology; Vision;

    Abstract : Avian eyes are big both in relative and absolute terms, thus the importance of vision to birds is obvious. Even though the general eye plan is rather conservative throughout the group, there is a great variation in visual capabilities. READ MORE

  7. 10. Eggshell thickness and levels of DDT, PCB and mercury in eggs of osprey [Pandion haliaetus (L.)] and marsh harrier [Circus aeruginosus (L.)] in relation to their breeding success and population status in Sweden

    Author : Tjelvar Odsjö; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Birds; metabolism; predatory birds; contamination; toxicity; population dynamics; sweden; Fiskgjuse; Brun kärrhök;

    Abstract : .... READ MORE