Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica
The physiological condition of larval Antarctic krill was investigated during austral autumn 2004 and winter 2006 in the Lazarev Sea. The condition of larvae was quantified in both seasons by determining their body length (BL), dry weight (DW), elemental and biochemical composition, stomach content...
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ftopenagrar:oai:www.openagrar.de:timport_mods_00036875 2023-05-15T14:00:29+02:00 Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica Meyer, Bettina Fuentes, Veronica Guerra, Citlali Schmidt, Katrin Atkinson, Angus Spahic, Susanne Cisewski, Boris Freier, Ulrich Olariaga, Alejandro Bathmann, Ulrich 2009 19 https://www.openagrar.de/receive/timport_mods_00036875 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00036875/dn049442.pdf eng eng Limnology and oceanography -- Limnol. Oceanogr. -- 0024-3590 -- 1939-5590 -- 412737-7 -- 2033191-5 https://www.openagrar.de/receive/timport_mods_00036875 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00036875/dn049442.pdf only signed in user info:eu-repo/semantics/openAccess Text article Text 2009 ftopenagrar 2023-03-06T00:04:12Z The physiological condition of larval Antarctic krill was investigated during austral autumn 2004 and winter 2006 in the Lazarev Sea. The condition of larvae was quantified in both seasons by determining their body length (BL), dry weight (DW), elemental and biochemical composition, 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, condition decreased 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 d21), whereas autumn underice values were higher (0.015 mm d21). Equivalent larval stages in winter had up to 30% shorter BL and 70% lower DW than in autumn. Mean respiration rates of winter larvae were 43% lower than of autumn larvae. However, their ammonium excretion rates doubled in winter from 0.03 to 0.06 mg NH4 DW21 h21, resulting in mean O:N ratios of 46 in autumn and 15 in winter. Thus, differing metabolic substrates were used between autumn and winter, which supports a degree of flexibility for overwintering of larval krill. The larvae were eating small copepods (Oithona spp.) and protozoans, as well as autotrophic food under the ice. The interplay between under-ice topography, apparent current speed under sea ice, and the swimming ability of larval krill is probably critical to whether larval krill can maintain position and exploit suitable feeding areas under the ice. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Lazarev Sea Sea ice Copepods OpenAgrar (OA) Antarctic Austral Lazarev ENVELOPE(12.917,12.917,-69.967,-69.967) Lazarev Sea ENVELOPE(7.000,7.000,-68.000,-68.000) |
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OpenAgrar (OA) |
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English |
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Text Meyer, Bettina Fuentes, Veronica Guerra, Citlali Schmidt, Katrin Atkinson, Angus Spahic, Susanne Cisewski, Boris Freier, Ulrich Olariaga, Alejandro Bathmann, Ulrich Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
topic_facet |
Text |
description |
The physiological condition of larval Antarctic krill was investigated during austral autumn 2004 and winter 2006 in the Lazarev Sea. The condition of larvae was quantified in both seasons by determining their body length (BL), dry weight (DW), elemental and biochemical composition, 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, condition decreased 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 d21), whereas autumn underice values were higher (0.015 mm d21). Equivalent larval stages in winter had up to 30% shorter BL and 70% lower DW than in autumn. Mean respiration rates of winter larvae were 43% lower than of autumn larvae. However, their ammonium excretion rates doubled in winter from 0.03 to 0.06 mg NH4 DW21 h21, resulting in mean O:N ratios of 46 in autumn and 15 in winter. Thus, differing metabolic substrates were used between autumn and winter, which supports a degree of flexibility for overwintering of larval krill. The larvae were eating small copepods (Oithona spp.) and protozoans, as well as autotrophic food under the ice. The interplay between under-ice topography, apparent current speed under sea ice, and the swimming ability of larval krill is probably critical to whether larval krill can maintain position and exploit suitable feeding areas under the ice. |
format |
Article in Journal/Newspaper |
author |
Meyer, Bettina Fuentes, Veronica Guerra, Citlali Schmidt, Katrin Atkinson, Angus Spahic, Susanne Cisewski, Boris Freier, Ulrich Olariaga, Alejandro Bathmann, Ulrich |
author_facet |
Meyer, Bettina Fuentes, Veronica Guerra, Citlali Schmidt, Katrin Atkinson, Angus Spahic, Susanne Cisewski, Boris Freier, Ulrich Olariaga, Alejandro Bathmann, Ulrich |
author_sort |
Meyer, Bettina |
title |
Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
title_short |
Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
title_full |
Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
title_fullStr |
Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
title_full_unstemmed |
Physiology, growth, and development of larval krillEuphausia superbain autumn and winter in the Lazarev Sea, Antarctica |
title_sort |
physiology, growth, and development of larval krilleuphausia superbain autumn and winter in the lazarev sea, antarctica |
publishDate |
2009 |
url |
https://www.openagrar.de/receive/timport_mods_00036875 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00036875/dn049442.pdf |
long_lat |
ENVELOPE(12.917,12.917,-69.967,-69.967) ENVELOPE(7.000,7.000,-68.000,-68.000) |
geographic |
Antarctic Austral Lazarev Lazarev Sea |
geographic_facet |
Antarctic Austral Lazarev Lazarev Sea |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Lazarev Sea Sea ice Copepods |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Lazarev Sea Sea ice Copepods |
op_relation |
Limnology and oceanography -- Limnol. Oceanogr. -- 0024-3590 -- 1939-5590 -- 412737-7 -- 2033191-5 https://www.openagrar.de/receive/timport_mods_00036875 https://www.openagrar.de/servlets/MCRFileNodeServlet/timport_derivate_00036875/dn049442.pdf |
op_rights |
only signed in user info:eu-repo/semantics/openAccess |
_version_ |
1766269650252857344 |