Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae
Physiological condition and feeding behavior of furcilia larvae were investigated in autumn (April 1999) in the southwestern Lazarev Sea prior to the critical overwintering period. Furcilia stage III (FIII) larvae were most abundant, so only these were used for all analyses (dry mass [DM], elemental...
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AMER SOC LIMNOLOGY OCEANOGRAPHY
2002
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ftnerc:oai:nora.nerc.ac.uk:10203 2023-05-15T13:45:10+02:00 Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae Meyer, B. Atkinson, A. Stubing, D. Oettl, B. Hagen, W. Bathmann, U.V. 2002 http://nora.nerc.ac.uk/id/eprint/10203/ unknown AMER SOC LIMNOLOGY OCEANOGRAPHY Meyer, B.; Atkinson, A.; Stubing, D.; Oettl, B.; Hagen, W.; Bathmann, U.V. 2002 Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae. Limnology and Oceanography, 47 (4). 943-952. Marine Sciences Biology and Microbiology Ecology and Environment Publication - Article PeerReviewed 2002 ftnerc 2023-02-04T19:26:36Z Physiological condition and feeding behavior of furcilia larvae were investigated in autumn (April 1999) in the southwestern Lazarev Sea prior to the critical overwintering period. Furcilia stage III (FIII) larvae were most abundant, so only these were used for all analyses (dry mass [DM], elemental and biochemical composition, gut content) and experiments (metabolic and ingestion rates, selective feeding behavior). Chlorophyll a (Ch1 a) concentrations in the mixed layer were <0.1 mug L-1. Respiration rates of freshly caught FIII larvae were between 0.4 and 1.2 mul O-2 mg(-1) DM h(-1), similar to larvae fed for 7 d on high food concentrations (4 mug Ch1 a L-1). Excretion rates ranged between 0.01 and 0.02 mug NH4 mg(-1) DM h(-1). Their atomic O:N ratio of 72 indicated that lipids were the main metabolic substrate of FIII larvae in the field. The daily C ration ranged from 0.4% at the lowest food concentration of 3 mug C L-1 to 28% at the highest enriched food concentration of 216 mug C L-1, whereas clearance rates decreased with increasing food concentrations. In natural seawater, 115 ml mg(-1) C h(-1), and in natural seawater enriched with ice biota, 24 ml mg(-1) C h(-1), the clearance rates on specific phytoplankton taxa revealed no significant difference across a food size range of 12-220 mum. The study suggests that during periods of low food supply in the water column, larvae have to exploit ice biota to cover their metabolic demands. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Lazarev ENVELOPE(12.917,12.917,-69.967,-69.967) Lazarev Sea ENVELOPE(7.000,7.000,-68.000,-68.000) |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Biology and Microbiology Ecology and Environment |
spellingShingle |
Marine Sciences Biology and Microbiology Ecology and Environment Meyer, B. Atkinson, A. Stubing, D. Oettl, B. Hagen, W. Bathmann, U.V. Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
topic_facet |
Marine Sciences Biology and Microbiology Ecology and Environment |
description |
Physiological condition and feeding behavior of furcilia larvae were investigated in autumn (April 1999) in the southwestern Lazarev Sea prior to the critical overwintering period. Furcilia stage III (FIII) larvae were most abundant, so only these were used for all analyses (dry mass [DM], elemental and biochemical composition, gut content) and experiments (metabolic and ingestion rates, selective feeding behavior). Chlorophyll a (Ch1 a) concentrations in the mixed layer were <0.1 mug L-1. Respiration rates of freshly caught FIII larvae were between 0.4 and 1.2 mul O-2 mg(-1) DM h(-1), similar to larvae fed for 7 d on high food concentrations (4 mug Ch1 a L-1). Excretion rates ranged between 0.01 and 0.02 mug NH4 mg(-1) DM h(-1). Their atomic O:N ratio of 72 indicated that lipids were the main metabolic substrate of FIII larvae in the field. The daily C ration ranged from 0.4% at the lowest food concentration of 3 mug C L-1 to 28% at the highest enriched food concentration of 216 mug C L-1, whereas clearance rates decreased with increasing food concentrations. In natural seawater, 115 ml mg(-1) C h(-1), and in natural seawater enriched with ice biota, 24 ml mg(-1) C h(-1), the clearance rates on specific phytoplankton taxa revealed no significant difference across a food size range of 12-220 mum. The study suggests that during periods of low food supply in the water column, larvae have to exploit ice biota to cover their metabolic demands. |
format |
Article in Journal/Newspaper |
author |
Meyer, B. Atkinson, A. Stubing, D. Oettl, B. Hagen, W. Bathmann, U.V. |
author_facet |
Meyer, B. Atkinson, A. Stubing, D. Oettl, B. Hagen, W. Bathmann, U.V. |
author_sort |
Meyer, B. |
title |
Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
title_short |
Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
title_full |
Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
title_fullStr |
Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
title_full_unstemmed |
Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae |
title_sort |
feeding and energy budgets of antarctic krill euphausia superba at the onset of winter. i. furcilia iii larvae |
publisher |
AMER SOC LIMNOLOGY OCEANOGRAPHY |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/10203/ |
long_lat |
ENVELOPE(12.917,12.917,-69.967,-69.967) ENVELOPE(7.000,7.000,-68.000,-68.000) |
geographic |
Antarctic Lazarev Lazarev Sea |
geographic_facet |
Antarctic Lazarev Lazarev Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Lazarev Sea |
op_relation |
Meyer, B.; Atkinson, A.; Stubing, D.; Oettl, B.; Hagen, W.; Bathmann, U.V. 2002 Feeding and energy budgets of Antarctic krill Euphausia superba at the onset of winter. I. Furcilia III larvae. Limnology and Oceanography, 47 (4). 943-952. |
_version_ |
1766214052303863808 |