Sökning: "cichlid"

Visar resultat 6 - 9 av 9 avhandlingar innehållade ordet cichlid.

  1. 6. Nerve fibres in relation to gingiva, tooth germs and teeth in the polyphyodont cichlid Tilapia mariae

    Författare :Fredrik Tuisku; Kaj Fried; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : In the late 19th century Retzius observed the presence of nerve fibres in goldfish tooth pulps. However, later studies on the relationship between the dentition and its innervation in non-mammalian vertebrates and its use in experimental research are rare. LÄS MER

  2. 7. Foraging behaviour in piscivorous fish: mechanisms and patterns

    Författare :Håkan Turesson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi; marine biology; Hydrobiology; piscivory; consumption rate; confusion effect; capture success; predation; encounter rate; prey choice;

    Sammanfattning : Mechanistic understanding of piscivore foraging at the individual level is important in order to understand and make predictions of piscivore effects at population and community levels. To understand the mechanisms affecting selection and consumption rates each step in the foraging cycle (search, encounter, active choice, attack, capture, ingestion, digestion) should be studied. LÄS MER

  3. 8. Development of photoreceptor organs in teleosts, Molecular and immunocytochemical studies

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

    Sammanfattning : 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. LÄS MER

  4. 9. Pesticide impact of intensive banana production on aquatic ecosystems in Costa Rica

    Författare :Luisa Eugenia Castillo; Donald J Baird; Stockholms universitet; []
    Nyckelord :Marine Ecotoxicology; marin ekotoxikologi;

    Sammanfattning : A combination of chemical and biological studies demonstrated extensive surface water contamination, the occurrence of pesticides in sediments, especially near the banana plantation areas, and biological impacts. Pesticides were even found in the downstream waters of the Tortuguero conservation area, a highly diverse wetland that protects several endangered species. LÄS MER