Blar i forfatter "Niehoff, Barbara"

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    • Aggregate feeding by the copepods Calanus and Pseudocalanus controls carbon flux attenuation in the Arctic shelf sea during the productive period 

      van der Jagt, Helga; Wiedmann, Ingrid; Hildebrandt, Nicole; Niehoff, Barbara; Iversen, Morten H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)
      Up to 95% of the oceanic primary production is recycled within the upper few hundred meters of the water column. Marine snow and zooplankton fecal pellets in the upper water column are often recycled at rates exceeding those measured for microbial degradation, suggesting that zooplankton might be important for flux attenuation of particulate organic carbon in the upper ocean. However, direct evidence ...

    • Copepods’ true colors: astaxanthin pigmentation as an indicator of fitness 

      Vilgrain, Laure; Maps, Frédéric; Basedow, Sünnje Linnéa; Trudnowska, Emilia; Madoui, Mohammed-Amin; Niehoff, Barbara; Ayata, Sakina‐Dorothée (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-08)
      Pigmentation is often overlooked in zooplankton, since these organisms are mostly colorless to fit the translucid water medium. However, one of the dominant zooplankton taxa in aquatic ecosystems—copepods—often show a bright red-orange or blue coloration owing to the accumulation of carotenoid pigments in some parts of their bodies. Even though there are many functional traits describing copepod’s ...

    • Sea ice decline drives biogeographical shifts of key Calanus species in the central Arctic Ocean 

      Ershova, Elizaveta A.; Kosobokova, Ksenia N.; Banas, Neil S.; Ellingsen, Ingrid; Niehoff, Barbara; Hildebrandt, Nicole; Hirche, Hans-Juergen (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-19)
      In recent decades, the central Arctic Ocean has been experiencing dramatic decline in sea ice coverage, thickness and extent, which is expected to have a tremendous impact on all levels of Arctic marine life. Here, we analyze the regional and temporal changes in pan-Arctic distribution and population structure of the key zooplankton species <i>Calanus glacialis</i> and <i>C. hyperboreus</i> in ...

    • Sea-ice decline could keep zooplankton deeper for longer 

      Flores, Hauke; Veyssière, Gaëlle; Castellani, Giulia; Wilkinson, Jeremy; Hoppmann, Mario; Karcher, Michael; Valcic, Lovro; Cornils, Astrid; Geoffroy, Maxime; Nicolaus, Marcel; Niehoff, Barbara; Priou, Pierre; Schmidt, Katrin; Stroeve, Julienne (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-28)
      As Arctic sea ice deteriorates, more light enters the ocean, causing largely unknown effects on the ecosystem. Using an autonomous biophysical observatory, we recorded zooplankton vertical distribution under Arctic sea ice from dusk to dawn of the polar night. Here we show that zooplankton ascend into the under-ice habitat during autumn twilight, following an isolume of 2.4 × 10<sup>−4</sup>  ...