Sökning: "GASTEROSTEUS-ACULEATUS"

Visar resultat 1 - 5 av 22 avhandlingar innehållade ordet GASTEROSTEUS-ACULEATUS.

  1. 1. Reproductive physiology of the female three-spined stickleback, Gasterosteus aculeatus

    Författare :Chrysoula Roufidou; Bertil Borg; Geir Lasse Taranger; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; overripening of eggs; spawning cycle; brain-pituitary-gonad BPG axis; vitellogenin; ovarian fluid; sex steroids; reproduction; three-spined stickleback; Gasterosteus aculeatus; fish; funktionell zoomorfologi; Functional Zoomorphology;

    Sammanfattning : Reproduction in vertebrates, including fishes, is under control of the brain-pituitary-gonad (BPG) axis. The female three-spined stickleback, Gasterosteus aculeatus, produces egg clutches at intervals of a few days and spawns them in a nest built by male. LÄS MER

  3. 2. The brain-pituitary-gonadal axis of the three-spined stickleback, Gasterosteus aculeatus

    Författare :Yi Ta Shao; Bertil Borg; Sylvie Dufou; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; BPG axis; GnRH; lh-β; fsh-β; three-spined stickleback; Gasterosteus aculeatus; homeostasis; feedback; funktionell zoomorfologi; Functional Zoomorphology;

    Sammanfattning : The seasonal reproduction of the three-spined stickleback is stimulated by long day photoperiod. As in other vertebrates, the reproductive system of stickleback is regulated by the brain-pituitary-gonadal (BPG) axis which is largely controlled by feedback effects. Both negative and positive feedback effects on the BPG axis have been found in fish. LÄS MER

  4. 3. The brain-pituitary-gonadal axis and gonadotropic hormones in the three-spined stickleback, Gasterosteus aculeatus

    Författare :Anna Hellqvist; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; brain-pituitary-gonadal; sticklebac; Gasterosteus aculeatus;

    Sammanfattning : .... LÄS MER

  5. 4. Role of 11-ketotestosterone and prolactin in the control of reproductive behaviour in the male three-spined stickleback, Gasterosteus aculeatus

    Författare :Miklós K. Páll; Rui Oliveira; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reproductive behaviour; three-spined stickleback; Gasterosteus aculeatus;

    Sammanfattning : The male three-spined stickleback, Gasterosteus aculeatus, builds a nest by glueing plant material together using an 11-ketotestosterone (11kT) induced protein (spiggin) secreted from the kidney. When females have been induced to lay eggs in the nest, male sexual (zigzag) behaviour decreases and parental care (fanning) increases. LÄS MER

  7. 5. Temporal relationships between fish-eating birds and their prey in a north Swedish river

    Författare :Kjell Sjöberg; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Seasonal and diel activity; food consumption; predator-prey relationships; fish-eating birds; anadromous fish; Mergus merganser; M. serrator; Sterna spp.; Larus spp.; Lampetra fluviatilis; Gasterosteus aculeatus;

    Sammanfattning : The seasonal and diel feeding habits of the goosander, Mergus merganser, the red-breasted merganser, M. serrator, gulls (Larus canus, L. argentatus and L. fuscusj and terns, Sterna hirundo/paradisaea were studied at 64V05'N. LÄS MER