Physiology, growth, and development of larval krill Euphausia superba in autumn and
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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ftciteseerx:oai:CiteSeerX.psu:10.1.1.554.4826 2023-05-15T13:45:41+02:00 Physiology, growth, and development of larval krill Euphausia superba in autumn and The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.4826 http://www.aslo.org/lo/toc/vol_54/issue_5/1595.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.4826 http://www.aslo.org/lo/toc/vol_54/issue_5/1595.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_54/issue_5/1595.pdf text ftciteseerx 2016-01-08T11:42:50Z 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 under-ice 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. Text Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Sea ice Copepods Unknown 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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ftciteseerx |
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English |
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 under-ice 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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
spellingShingle |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
title_short |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
title_full |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
title_fullStr |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
title_full_unstemmed |
Physiology, growth, and development of larval krill Euphausia superba in autumn and |
title_sort |
physiology, growth, and development of larval krill euphausia superba in autumn and |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.4826 http://www.aslo.org/lo/toc/vol_54/issue_5/1595.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 Euphausia superba Lazarev Sea Sea ice Copepods |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Sea ice Copepods |
op_source |
http://www.aslo.org/lo/toc/vol_54/issue_5/1595.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.4826 http://www.aslo.org/lo/toc/vol_54/issue_5/1595.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766229781195522048 |