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  • Institut für Meereskunde an der Universität Kiel  (1)
  • NATL INQUIRY SERVICES CENTRE PTY LTD  (1)
  • 1
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    Fahrtleiterbericht FS "Poseidon", Fahrt-No. 161/1 [POS161/1], 4.-14.8.1989, Kattegat (1989)
    Institut für Meereskunde an der Universität Kiel
    In:  Institut für Meereskunde an der Universität Kiel, Kiel, 7 pp.
    Details
    Publikationsdatum: 2015-02-03
    Materialart: Report , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Fahrtbericht
  • 2
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    Thermal constraints on the respiration and excretion rates of krill, Euphausia hanseni and Nematoscelis megalops, in the northern Benguela upwelling system off Namibia (2012)
    NATL INQUIRY SERVICES CENTRE PTY LTD
    In:  EPIC3African Journal of Marine Science, NATL INQUIRY SERVICES CENTRE PTY LTD, 34(3), pp. 391-399, ISSN: 1814-232X
    Details
    Publikationsdatum: 2019-07-17
    Beschreibung: Rates of respiration and ammonia excretion of Euphausia hanseni and Nematoscelis megalops were determined experimentally at four temperatures representative of conditions encountered by these euphausiid species in the northern Benguela upwelling environment. The respiration rate increased from 7.7 μmol O2 h–1 gww–1 at 5 °C to 18.1 μmol O2 h–1 gww –1 at 20 °C in E. hanseni and from 7.0 μmol O2 h–1 gww–1 (5 °C) to 23.4 μmol O2 h–1 gww –1 (20 °C) in N. megalops. The impact of temperature on oxygen uptake of the two species differed significantly. Nematoscelis megalops showed thermal adaptations to temperatures between 5 °C and 10 °C (Q10 = 1.9) and metabolic constraint was evident at higher temperatures (Q10 = 2.6). In contrast, E. hanseni showed adaptations to temperatures of 10–20 °C (Q10 = 1.5) and experienced metabolic depression below 10 °C (Q10 = 2.6). Proteins were predominantly metabolised by E. hanseni in contrast to lipids by N. megalops. Carbon demand of N. megalops between 5 and 15 °C was lower than in E. hanseni versus equal food requirements at 20 °C. It is concluded that the two species display different physiological adaptations, based on their respective temperature adaptations, which are mirrored in their differential vertical positioning in the water column.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
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