Embryonic suckling and maternal specializations in the live-bearing teleost Zoarces viviparus

Peter Vilhelm Skov, John Fleng Steffensen, Thomas Flarup Sørensen, Klaus Qvortrup

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    Resumé

    The European eelpout follows an aplacental viviparous reproductive strategy, in which gestation lasts 4-5 months. During the last months of development yolk reserves are depleted, and embryos depend on an external source of nutrients. Here we provide evidence for novel specialized physiological, morphological and behavioural adaptations, which we propose as the responsible mechanisms for the exchange of nutrients and gases between the maternal organism and her embryos. Ovarian follicles contain an internal glomerulus-like structure within the distal tip of each follicle. Ultrastructural examination indicated a capacity for steroid synthesis and secretion. Gel electrophoresis demonstrated a protein size distribution in the follicular fluid different from that of the maternal serum, and that ovarian fluid is devoid of protein. From vascular casts and histological sections the follicle was reconstructed. The glomerulus has a central canal that is exteriorized at the tip of the follicle, allowing passage of follicular fluid. Oxygen measurements across the ovary of near-term females showed a strongly hypoxic ovary lumen, yet ovarian fluid adjacent to follicles was oxygen saturated. As another novel observation, embryos were seen engaged in suckling on follicles. We hypothesize that embryos use the follicles on the ovarian wall as placental analogues and that they use their mobile jaw apparatus to attach themselves and apply suction
    OriginalsprogEngelsk
    TidsskriftJournal of Experimental Marine Biology and Ecology
    Vol/bind395
    Udgave nummer1-2
    Sider (fra-til)120-127
    ISSN0022-0981
    DOI
    StatusUdgivet - 2010

    Citer dette

    Skov, Peter Vilhelm ; Steffensen, John Fleng ; Sørensen, Thomas Flarup ; Qvortrup, Klaus. / Embryonic suckling and maternal specializations in the live-bearing teleost Zoarces viviparus. I: Journal of Experimental Marine Biology and Ecology. 2010 ; Bind 395, Nr. 1-2. s. 120-127.
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    title = "Embryonic suckling and maternal specializations in the live-bearing teleost Zoarces viviparus",
    abstract = "The European eelpout follows an aplacental viviparous reproductive strategy, in which gestation lasts 4-5 months. During the last months of development yolk reserves are depleted, and embryos depend on an external source of nutrients. Here we provide evidence for novel specialized physiological, morphological and behavioural adaptations, which we propose as the responsible mechanisms for the exchange of nutrients and gases between the maternal organism and her embryos. Ovarian follicles contain an internal glomerulus-like structure within the distal tip of each follicle. Ultrastructural examination indicated a capacity for steroid synthesis and secretion. Gel electrophoresis demonstrated a protein size distribution in the follicular fluid different from that of the maternal serum, and that ovarian fluid is devoid of protein. From vascular casts and histological sections the follicle was reconstructed. The glomerulus has a central canal that is exteriorized at the tip of the follicle, allowing passage of follicular fluid. Oxygen measurements across the ovary of near-term females showed a strongly hypoxic ovary lumen, yet ovarian fluid adjacent to follicles was oxygen saturated. As another novel observation, embryos were seen engaged in suckling on follicles. We hypothesize that embryos use the follicles on the ovarian wall as placental analogues and that they use their mobile jaw apparatus to attach themselves and apply suction",
    keywords = "Matrotrophy, Nutrition, Oxygen, Suckling, Viviparity",
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    Embryonic suckling and maternal specializations in the live-bearing teleost Zoarces viviparus. / Skov, Peter Vilhelm; Steffensen, John Fleng; Sørensen, Thomas Flarup; Qvortrup, Klaus.

    I: Journal of Experimental Marine Biology and Ecology, Bind 395, Nr. 1-2, 2010, s. 120-127.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    TY - JOUR

    T1 - Embryonic suckling and maternal specializations in the live-bearing teleost Zoarces viviparus

    AU - Skov, Peter Vilhelm

    AU - Steffensen, John Fleng

    AU - Sørensen, Thomas Flarup

    AU - Qvortrup, Klaus

    PY - 2010

    Y1 - 2010

    N2 - The European eelpout follows an aplacental viviparous reproductive strategy, in which gestation lasts 4-5 months. During the last months of development yolk reserves are depleted, and embryos depend on an external source of nutrients. Here we provide evidence for novel specialized physiological, morphological and behavioural adaptations, which we propose as the responsible mechanisms for the exchange of nutrients and gases between the maternal organism and her embryos. Ovarian follicles contain an internal glomerulus-like structure within the distal tip of each follicle. Ultrastructural examination indicated a capacity for steroid synthesis and secretion. Gel electrophoresis demonstrated a protein size distribution in the follicular fluid different from that of the maternal serum, and that ovarian fluid is devoid of protein. From vascular casts and histological sections the follicle was reconstructed. The glomerulus has a central canal that is exteriorized at the tip of the follicle, allowing passage of follicular fluid. Oxygen measurements across the ovary of near-term females showed a strongly hypoxic ovary lumen, yet ovarian fluid adjacent to follicles was oxygen saturated. As another novel observation, embryos were seen engaged in suckling on follicles. We hypothesize that embryos use the follicles on the ovarian wall as placental analogues and that they use their mobile jaw apparatus to attach themselves and apply suction

    AB - The European eelpout follows an aplacental viviparous reproductive strategy, in which gestation lasts 4-5 months. During the last months of development yolk reserves are depleted, and embryos depend on an external source of nutrients. Here we provide evidence for novel specialized physiological, morphological and behavioural adaptations, which we propose as the responsible mechanisms for the exchange of nutrients and gases between the maternal organism and her embryos. Ovarian follicles contain an internal glomerulus-like structure within the distal tip of each follicle. Ultrastructural examination indicated a capacity for steroid synthesis and secretion. Gel electrophoresis demonstrated a protein size distribution in the follicular fluid different from that of the maternal serum, and that ovarian fluid is devoid of protein. From vascular casts and histological sections the follicle was reconstructed. The glomerulus has a central canal that is exteriorized at the tip of the follicle, allowing passage of follicular fluid. Oxygen measurements across the ovary of near-term females showed a strongly hypoxic ovary lumen, yet ovarian fluid adjacent to follicles was oxygen saturated. As another novel observation, embryos were seen engaged in suckling on follicles. We hypothesize that embryos use the follicles on the ovarian wall as placental analogues and that they use their mobile jaw apparatus to attach themselves and apply suction

    KW - Matrotrophy

    KW - Nutrition

    KW - Oxygen

    KW - Suckling

    KW - Viviparity

    U2 - 10.1016/j.jembe.2010.08.024

    DO - 10.1016/j.jembe.2010.08.024

    M3 - Journal article

    VL - 395

    SP - 120

    EP - 127

    JO - Journal of Experimental Marine Biology and Ecology

    JF - Journal of Experimental Marine Biology and Ecology

    SN - 0022-0981

    IS - 1-2

    ER -