Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica
The chemical composition, metabolism, and feeding ecology of the cydippid ctenophore Callianira antarctica (Chun 1897) were investigated during autumn and winter 2001 and 2002 in the vicinity of Marguerite Bay, an embayment on the western Antarctic Peninsula shelf. C. an tarctica had relatively high...
Published in: | Marine Ecology Progress Series |
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Digital Commons @ University of South Florida
2006
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/16 https://doi.org/10.3354/meps317111 |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-1015 2023-07-30T03:56:56+02:00 Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica Scolardi, Kerri M. Daly, Kendra L. Pakhomov, Evgeny A. Torres, Joseph J. 2006-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/16 https://doi.org/10.3354/meps317111 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/16 doi:10.3354/meps317111 https://doi.org/10.3354/meps317111 Marine Science Faculty Publications Antarctic zooplankton ctenophore krill copepod digestion time daily ration gut contents overwintering Life Sciences Marine Biology article 2006 ftusouthflorida https://doi.org/10.3354/meps317111 2023-07-13T20:21:41Z The chemical composition, metabolism, and feeding ecology of the cydippid ctenophore Callianira antarctica (Chun 1897) were investigated during autumn and winter 2001 and 2002 in the vicinity of Marguerite Bay, an embayment on the western Antarctic Peninsula shelf. C. an tarctica had relatively high carbon (C) and nitrogen (N) values (average: 8.4% C and 1.8% N [% dry weight, DW]), further suggesting that polar ctenophores are more C-rich than tropical species. Winter oxygen consumption and ammonium excretion rates ranged from 0.059 to 0.411 mu l O-2 mg(-1) DW h(-1) and 0.043 to 2.22 nmol N mg(-1) DW h(-1), respectively, at 0 degrees C. Calanoid copepods, larval and juvenile Antarctic krill Euphausia superba and a mixture of prey were offered to ctenophores during feeding incubations. Ingestion rates based on preliminary feeding experiments were linearly related to prey densities, with rates ranging from 9 to 39 prey ind.(-1) d(-1) and from 3.5 to 4.0 prey ind.(-1) d(-1) for 1 larger and I smaller C. antarctica, respectively. Daily rations varied between 22 and 136% of body C for the larger ctenophore and 6 to 22 % of body C for the smaller individual. Digestion time (median: 11.5 h) was dependent on prey elemental content and prey number, and was independent of ctenophore size. Gut content analyses indicated that C. antarctica preyed predominantly on larval euphausiids and copepods. Diver observations, net collections, and diet analyses suggest that this species is an opportunistic predator that feeds both during the day and night, and appears to be well adapted to the prey patchiness found in Antarctic waters. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Euphausia superba Copepods University of South Florida St. Petersburg: Digital USFSP Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) The Antarctic Marine Ecology Progress Series 317 111 126 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Antarctic zooplankton ctenophore krill copepod digestion time daily ration gut contents overwintering Life Sciences Marine Biology |
spellingShingle |
Antarctic zooplankton ctenophore krill copepod digestion time daily ration gut contents overwintering Life Sciences Marine Biology Scolardi, Kerri M. Daly, Kendra L. Pakhomov, Evgeny A. Torres, Joseph J. Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
topic_facet |
Antarctic zooplankton ctenophore krill copepod digestion time daily ration gut contents overwintering Life Sciences Marine Biology |
description |
The chemical composition, metabolism, and feeding ecology of the cydippid ctenophore Callianira antarctica (Chun 1897) were investigated during autumn and winter 2001 and 2002 in the vicinity of Marguerite Bay, an embayment on the western Antarctic Peninsula shelf. C. an tarctica had relatively high carbon (C) and nitrogen (N) values (average: 8.4% C and 1.8% N [% dry weight, DW]), further suggesting that polar ctenophores are more C-rich than tropical species. Winter oxygen consumption and ammonium excretion rates ranged from 0.059 to 0.411 mu l O-2 mg(-1) DW h(-1) and 0.043 to 2.22 nmol N mg(-1) DW h(-1), respectively, at 0 degrees C. Calanoid copepods, larval and juvenile Antarctic krill Euphausia superba and a mixture of prey were offered to ctenophores during feeding incubations. Ingestion rates based on preliminary feeding experiments were linearly related to prey densities, with rates ranging from 9 to 39 prey ind.(-1) d(-1) and from 3.5 to 4.0 prey ind.(-1) d(-1) for 1 larger and I smaller C. antarctica, respectively. Daily rations varied between 22 and 136% of body C for the larger ctenophore and 6 to 22 % of body C for the smaller individual. Digestion time (median: 11.5 h) was dependent on prey elemental content and prey number, and was independent of ctenophore size. Gut content analyses indicated that C. antarctica preyed predominantly on larval euphausiids and copepods. Diver observations, net collections, and diet analyses suggest that this species is an opportunistic predator that feeds both during the day and night, and appears to be well adapted to the prey patchiness found in Antarctic waters. |
format |
Article in Journal/Newspaper |
author |
Scolardi, Kerri M. Daly, Kendra L. Pakhomov, Evgeny A. Torres, Joseph J. |
author_facet |
Scolardi, Kerri M. Daly, Kendra L. Pakhomov, Evgeny A. Torres, Joseph J. |
author_sort |
Scolardi, Kerri M. |
title |
Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
title_short |
Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
title_full |
Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
title_fullStr |
Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
title_full_unstemmed |
Feeding Ecology and Metabolism of the Antarctic Cydippid Ctenophore Callianira Antarctica |
title_sort |
feeding ecology and metabolism of the antarctic cydippid ctenophore callianira antarctica |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2006 |
url |
https://digitalcommons.usf.edu/msc_facpub/16 https://doi.org/10.3354/meps317111 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Euphausia superba Copepods |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Antarctica Euphausia superba Copepods |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/16 doi:10.3354/meps317111 https://doi.org/10.3354/meps317111 |
op_doi |
https://doi.org/10.3354/meps317111 |
container_title |
Marine Ecology Progress Series |
container_volume |
317 |
container_start_page |
111 |
op_container_end_page |
126 |
_version_ |
1772815210868899840 |