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Datasets of project "Geochemistry and ecology of the Namibian upwelling system"

Mostrando recursos 1 - 20 de 62

  1. Respiration rates and abundances of dominant copepods of the northern Benguela Current System

    Schukat, Anna; Teuber, Lena; Hagen, Wilhelm; Wasmund, Norbert; Auel, Holger
    Respiration rates of 16 calanoid copepod species from the northern Benguela upwelling system were measured on board RRS Discovery in September/October 2010 to determine their energy requirements and assess their significance in the carbon cycle. Individual respiration rates were standardised to a mean copepod body mass and a temperature regime typical of the northern Benguela Current. These adjusted respiration rates revealed two different activity levels (active and resting) in copepodids C5 of Calanoides carinatus and females of Rhincalanus nasutus, which reduced their metabolism during dormancy by 82% and 62%, respectively. An allometric function (Imax) and an energy budget approach were...

  2. Respiration rates and abundances of dominant copepods of the northern Benguela Current System

    Schukat, Anna; Teuber, Lena; Hagen, Wilhelm; Wasmund, Norbert; Auel, Holger
    Respiration rates of 16 calanoid copepod species from the northern Benguela upwelling system were measured on board RRS Discovery in September/October 2010 to determine their energy requirements and assess their significance in the carbon cycle. Individual respiration rates were standardised to a mean copepod body mass and a temperature regime typical of the northern Benguela Current. These adjusted respiration rates revealed two different activity levels (active and resting) in copepodids C5 of Calanoides carinatus and females of Rhincalanus nasutus, which reduced their metabolism during dormancy by 82% and 62%, respectively. An allometric function (Imax) and an energy budget approach were...

  3. Calanoid copepod abundances in the northern Benguela Current System from 2009 and 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Abundance data of copepods were derived from vertical Multinet hauls at 10 stations, carried out in the northern Benguela upwelling system in December 2009 (FRS Africana) and September/October 2010 (RRS Discovery). Three transects along ~ 17°S, 19°S and 23°S with three stations each (neritic, shelf break, oceanic) and one station at 21°S were analysed for copepod abundance. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 700 m (2009) and 1000 m (2010) for the oceanic stations. Calanoid copepod species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5...

  4. Calanoid copepod abundances in the northern Benguela Current System from 2009 and 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Abundance data of copepods were derived from vertical Multinet hauls at 10 stations, carried out in the northern Benguela upwelling system in December 2009 (FRS Africana) and September/October 2010 (RRS Discovery). Three transects along ~ 17°S, 19°S and 23°S with three stations each (neritic, shelf break, oceanic) and one station at 21°S were analysed for copepod abundance. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 700 m (2009) and 1000 m (2010) for the oceanic stations. Calanoid copepod species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5...

  5. Calanoid copepod abundances in the northern Benguela Current System from 2009 and 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Abundance data of copepods were derived from vertical Multinet hauls at 10 stations, carried out in the northern Benguela upwelling system in December 2009 (FRS Africana) and September/October 2010 (RRS Discovery). Three transects along ~ 17°S, 19°S and 23°S with three stations each (neritic, shelf break, oceanic) and one station at 21°S were analysed for copepod abundance. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 700 m (2009) and 1000 m (2010) for the oceanic stations. Calanoid copepod species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5...

  6. Calanoid copepod abundances in the northern Benguela Current System from 2009 and 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Abundance data of copepods were derived from vertical Multinet hauls at 10 stations, carried out in the northern Benguela upwelling system in December 2009 (FRS Africana) and September/October 2010 (RRS Discovery). Three transects along ~ 17°S, 19°S and 23°S with three stations each (neritic, shelf break, oceanic) and one station at 21°S were analysed for copepod abundance. Maximum sampling depth was either close to the seafloor (neritic and shelf break stations) or 700 m (2009) and 1000 m (2010) for the oceanic stations. Calanoid copepod species and stages were identified and enumerated separately. Adult females, males and copepodite stage 5...

  7. Respiration and ingestion rates of calanoid copepod in the northern Benguela Current System measured ex situ during the RSS Discovery D356 cruise in 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Respiration rates of 16 calanoid copepod species from the northern Benguela upwelling system were measured on board RRS Discovery in September/October 2010 to determine their energy requirements and assess their significance in the carbon cycle. Copepod species were sampled by different net types. Immediately after the hauls, samples were sorted to species and stages (16 species; females, males and C5 copepodids) according to Bradford-Grieve et al. (1999). Specimens were kept in temperature-controlled refrigerators for at least 12 h before they were used in experiments. Respiration rates of different copepod species were measured onboard by optode respirometry (for details see Köster...

  8. Respiration and ingestion rates of calanoid copepod in the northern Benguela Current System measured ex situ during the RSS Discovery D356 cruise in 2010

    Schukat, Anna; Teuber, Lena; Auel, Holger
    Respiration rates of 16 calanoid copepod species from the northern Benguela upwelling system were measured on board RRS Discovery in September/October 2010 to determine their energy requirements and assess their significance in the carbon cycle. Copepod species were sampled by different net types. Immediately after the hauls, samples were sorted to species and stages (16 species; females, males and C5 copepodids) according to Bradford-Grieve et al. (1999). Specimens were kept in temperature-controlled refrigerators for at least 12 h before they were used in experiments. Respiration rates of different copepod species were measured onboard by optode respirometry (for details see Köster...

  9. Respiration rates and electron transport system activities of copepod species obtained during Maria S. Merian cruise MSM17/3

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger
    Respiration rates and electron transport system (ETS) activities were measured in dominant copepod species from the northern Benguela upwelling system in January-February 2011 to assess the accuracy of the ETS assay in predicting in vivo respiration rates. Individual respiration rates varied from 0.06 to 1.60 µL O2/h/ind, while ETS activities converted to oxygen consumption ranged from 0.14 to 4.46 µL O2/h/ind. ETS activities were significantly correlated with respiration rates (r**2 = 0.79, p = 0.0001). R:ETS ratios were lowest in slow-moving Eucalanidae (0.11) and highest in diapausing Calanoides carinatus copepodids CV (0.76) while fast-moving copepods showed intermediate R:ETS (0.23-0.37). 82%...

  10. Respiration rates and electron transport system activities of copepod species obtained during Maria S. Merian cruise MSM17/3

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger
    Respiration rates and electron transport system (ETS) activities were measured in dominant copepod species from the northern Benguela upwelling system in January-February 2011 to assess the accuracy of the ETS assay in predicting in vivo respiration rates. Individual respiration rates varied from 0.06 to 1.60 µL O2/h/ind, while ETS activities converted to oxygen consumption ranged from 0.14 to 4.46 µL O2/h/ind. ETS activities were significantly correlated with respiration rates (r**2 = 0.79, p = 0.0001). R:ETS ratios were lowest in slow-moving Eucalanidae (0.11) and highest in diapausing Calanoides carinatus copepodids CV (0.76) while fast-moving copepods showed intermediate R:ETS (0.23-0.37). 82%...

  11. Mass specific and individual ETS activities of dominant copopod species sampled during Maria S. Merian cruise MSM17/3 in the northern Benguela Current System

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger

  12. Mass specific and individual ETS activities of dominant copopod species sampled during Maria S. Merian cruise MSM17/3 in the northern Benguela Current System

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger

  13. Mass specific and individual respiration rates of dominant copopod species sampled during Maria S. Merian cruise MSM17/3 in the northern Benguela Current System

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger

  14. Mass specific and individual respiration rates of dominant copopod species sampled during Maria S. Merian cruise MSM17/3 in the northern Benguela Current System

    Bode, Maya; Schukat, Anna; Hagen, Wilhelm; Auel, Holger

  15. Hydrographic measurements in the Northern Benguela upwelling system during the cruise Discovery D356

    Mohrholz, Volker

  16. Hydrographic measurements in the Northern Benguela upwelling system during the cruise Discovery D356

    Mohrholz, Volker

  17. Hydrographic measurements in the Northern Benguela upwelling system during the cruise AFR 258

    Mohrholz, Volker

  18. Hydrographic measurements in the Northern Benguela upwelling system during the cruise AFR 258

    Mohrholz, Volker

  19. Hydrographic measurements in the Northern Benguela upwelling system during the cruise MSM 17/3

    Mohrholz, Volker

  20. Hydrographic measurements in the Northern Benguela upwelling system during the cruise MSM 17/3

    Mohrholz, Volker

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