Physiology, growth and development of larval krill ''Euphausia superba'' in autumn and winter in the Lazarev Sea, Antarctica ...

• Main Authors: Meyer, Bettina, Fuentes, Veronica, Guerra, Citlali, Schmidt, Katrin, Atkinson, Angus, Spahic, Susanne, Cisewski, Boris, Freier, Ulrich, Olariaga, Alejandro, Bathmann, Ulrich
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2009
• Subjects: Bongo net; Hand net; Sampling by diver; ANT-XXI/4; ANT-XXIII/6; Polarstern; Biological Oceanography @ AWI AWI_BioOce; Antarctic; Atkinson; Austral; Lazarev; Lazarev Sea; Antarc*; Antarctic Krill; Antarctica; Euphausia superba
• Online Access: https://dx.doi.org/10.1594/pangaea.707193; https://doi.pangaea.de/10.1594/PANGAEA.707193

The physiological condition of larval Antarctic krill was investigated during austral autumn 2004 and winter 2006 in the Lazarev Sea, to provide better understanding of a critical period of their life cycle. The condition of larvae was quantified in both seasons by determining their body length (BL), dry mass (DM), elemental- and biochemical composition, as well as stomach content analysis, and rates of metabolism and growth. Overall the larvae in autumn were in better condition under the ice than in open water, and for those under the ice there was a decrease in condition from autumn to winter. Thus growth rates of furcilia larvae in open water in autumn were similar to winter values under the ice (mean 0.008 mm/d), whereas autumn, under ice values were higher: 0.015 mm/d. Equivalent larval stages had up to 30% lower BL and 70% lower DM in winter compared to autumn, with mean oxygen consumption 44% lower (0.54 µl O2 DM/h). However, their ammonium excretion rates doubled (from 0.03-0.06 µg NH4 DM/h) so their ... : Supplement to: Meyer, Bettina; Fuentes, Veronica; Guerra, Citlali; Schmidt, Katrin; Atkinson, Angus; Spahic, Susanne; Cisewski, Boris; Freier, Ulrich; Olariaga, Alejandro; Bathmann, Ulrich (2009): Physiology, growth and development of larval krill ''Euphausia superba'' in autumn and winter in the Lazarev Sea, Antarctica. Limnology and Oceanography, 54(5) ...