Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)

Antarctickrill, Euphausiasuperba, isakeystonespeciesintheSouthernOcean.However,informationongrowth,dietandconditionduringwinterandearlyspringislimited,hamperingourunderstandingofthese fundamentalbiologicalparametersatthisimportantperiodintheirlifecycle.Ourstudyassesseddiet andconditionoflarvalandpos...

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Published in:Deep Sea Research Part II: Topical Studies in Oceanography
Main Authors: O'Brien, CJ, Virtue, P, Kawaguchi, S, Nichols, PD
Format: Article in Journal/Newspaper
Language:English
Published: Pergamon-Elsevier Science Ltd 2011
Subjects:
Biological Sciences
Ecology
Marine and Estuarine Ecology (incl. Marine Ichthyology)
East Antarctica
Antarc*
Antarctica
Online Access:https://doi.org/10.1016/j.dsr2.2010.11.001
http://ecite.utas.edu.au/76369
id ftunivtasecite:oai:ecite.utas.edu.au:76369
record_format openpolar
spelling ftunivtasecite:oai:ecite.utas.edu.au:76369 2023-05-15T14:02:30+02:00 Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E) O'Brien, CJ Virtue, P Kawaguchi, S Nichols, PD 2011 application/pdf https://doi.org/10.1016/j.dsr2.2010.11.001 http://ecite.utas.edu.au/76369 en eng Pergamon-Elsevier Science Ltd http://ecite.utas.edu.au/76369/2/2011 DSR Krill Winter Growth (Colleen).pdf http://dx.doi.org/10.1016/j.dsr2.2010.11.001 O'Brien, CJ and Virtue, P and Kawaguchi, S and Nichols, PD, Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E), Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (9-10) pp. 1211-1221. ISSN 0967-0645 (2011) [Refereed Article] http://ecite.utas.edu.au/76369 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.1016/j.dsr2.2010.11.001 2019-12-13T21:42:45Z Antarctickrill, Euphausiasuperba, isakeystonespeciesintheSouthernOcean.However,informationongrowth,dietandconditionduringwinterandearlyspringislimited,hamperingourunderstandingofthese fundamentalbiologicalparametersatthisimportantperiodintheirlifecycle.Ourstudyassesseddiet andconditionoflarvalandpostlarvalkrillcollectedfromopenwaterandbelowtheiceoffEastAntarctica(110130% oE) inSeptember/October2007.Conditionwasassessedusinglipidcontent,growthratesanddigestiveglandsize;feedinghistorywasassessedusingfattyacidprofilesandstomachcontentanalysis;anda207-daystarvationstudyinvestigatedtheresponseofkrilltolong-termfooddeprivation.Potentialfooditems(Calanuspropinquus and sea-icebiota)wereanalysedforlipidandfattyacidcompositiontocomparewithkrillsamples.Krillwerefoundtobeingoodcondition,withmeangrowthrate of0.95%permoultforpostlarvaeand14.79%forlarvae,andmeanlipidcontentof24.1%forpostlarvaeand 6.6%forlarvae.Fattyacidprofilesandstomachcontentanalysisrevealedtwomainfeedingstrategies- krillbelowtheicewerefeedingmostlyonsea-icediatoms,whilethoseinopenwaterwereingestingcopepodsanddetritus.Krillbelowtheicehadlargerdigestiveglandsthanthoseinopenwater.Furciliaefatty acidprofilesindicatedadietofheterotrophicflagellatesand/ordetritus.Postlarvalkrillsurvived207days offooddeprivationbyusingbodyproteinandlipidreservesforenergy.Incontrast,krillfurciliaewere severelydepletedafterjust5daysoffooddeprivation,indicatingthattheymustfeedcontinuallyatthis timeofyear.Krill,copepodsandsea-icebiotawerealllowinpolyunsaturatedfattyacids,indicatingthat krillmustrelyonlaterspringphytoplanktonbloomstoobtaintheseessentialnutrientsrequiredforreproduction. Article in Journal/Newspaper Antarc* Antarctica East Antarctica eCite UTAS (University of Tasmania) East Antarctica Deep Sea Research Part II: Topical Studies in Oceanography 58 9-10 1211 1221
institution Open Polar
collection eCite UTAS (University of Tasmania)
op_collection_id ftunivtasecite
language English
topic Biological Sciences
Ecology
Marine and Estuarine Ecology (incl. Marine Ichthyology)
spellingShingle Biological Sciences
Ecology
Marine and Estuarine Ecology (incl. Marine Ichthyology)
O'Brien, CJ
Virtue, P
Kawaguchi, S
Nichols, PD
Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
topic_facet Biological Sciences
Ecology
Marine and Estuarine Ecology (incl. Marine Ichthyology)
description Antarctickrill, Euphausiasuperba, isakeystonespeciesintheSouthernOcean.However,informationongrowth,dietandconditionduringwinterandearlyspringislimited,hamperingourunderstandingofthese fundamentalbiologicalparametersatthisimportantperiodintheirlifecycle.Ourstudyassesseddiet andconditionoflarvalandpostlarvalkrillcollectedfromopenwaterandbelowtheiceoffEastAntarctica(110130% oE) inSeptember/October2007.Conditionwasassessedusinglipidcontent,growthratesanddigestiveglandsize;feedinghistorywasassessedusingfattyacidprofilesandstomachcontentanalysis;anda207-daystarvationstudyinvestigatedtheresponseofkrilltolong-termfooddeprivation.Potentialfooditems(Calanuspropinquus and sea-icebiota)wereanalysedforlipidandfattyacidcompositiontocomparewithkrillsamples.Krillwerefoundtobeingoodcondition,withmeangrowthrate of0.95%permoultforpostlarvaeand14.79%forlarvae,andmeanlipidcontentof24.1%forpostlarvaeand 6.6%forlarvae.Fattyacidprofilesandstomachcontentanalysisrevealedtwomainfeedingstrategies- krillbelowtheicewerefeedingmostlyonsea-icediatoms,whilethoseinopenwaterwereingestingcopepodsanddetritus.Krillbelowtheicehadlargerdigestiveglandsthanthoseinopenwater.Furciliaefatty acidprofilesindicatedadietofheterotrophicflagellatesand/ordetritus.Postlarvalkrillsurvived207days offooddeprivationbyusingbodyproteinandlipidreservesforenergy.Incontrast,krillfurciliaewere severelydepletedafterjust5daysoffooddeprivation,indicatingthattheymustfeedcontinuallyatthis timeofyear.Krill,copepodsandsea-icebiotawerealllowinpolyunsaturatedfattyacids,indicatingthat krillmustrelyonlaterspringphytoplanktonbloomstoobtaintheseessentialnutrientsrequiredforreproduction.
format Article in Journal/Newspaper
author O'Brien, CJ
Virtue, P
Kawaguchi, S
Nichols, PD
author_facet O'Brien, CJ
Virtue, P
Kawaguchi, S
Nichols, PD
author_sort O'Brien, CJ
title Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
title_short Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
title_full Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
title_fullStr Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
title_full_unstemmed Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
title_sort aspects of krill growth and condition during late winter-early spring off east antarctica (110-130°e)
publisher Pergamon-Elsevier Science Ltd
publishDate 2011
url https://doi.org/10.1016/j.dsr2.2010.11.001
http://ecite.utas.edu.au/76369
geographic East Antarctica
geographic_facet East Antarctica
genre Antarc*
Antarctica
East Antarctica
genre_facet Antarc*
Antarctica
East Antarctica
op_relation http://ecite.utas.edu.au/76369/2/2011 DSR Krill Winter Growth (Colleen).pdf
http://dx.doi.org/10.1016/j.dsr2.2010.11.001
O'Brien, CJ and Virtue, P and Kawaguchi, S and Nichols, PD, Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E), Deep-Sea Research. Part 2: Topical Studies in Oceanography, 58, (9-10) pp. 1211-1221. ISSN 0967-0645 (2011) [Refereed Article]
http://ecite.utas.edu.au/76369
op_doi https://doi.org/10.1016/j.dsr2.2010.11.001
container_title Deep Sea Research Part II: Topical Studies in Oceanography
container_volume 58
container_issue 9-10
container_start_page 1211
op_container_end_page 1221
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