Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba
Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , , , |
Format: | Text |
Language: | English |
Published: |
Public Library of Science
2017
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5321404/ http://www.ncbi.nlm.nih.gov/pubmed/28225825 https://doi.org/10.1371/journal.pone.0171773 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:5321404 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:5321404 2023-05-15T13:52:44+02:00 Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba Kilada, Raouf Reiss, Christian S. Kawaguchi, So King, Robert A. Matsuda, Tsuyoshi Ichii, Taro 2017-02-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5321404/ http://www.ncbi.nlm.nih.gov/pubmed/28225825 https://doi.org/10.1371/journal.pone.0171773 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5321404/ http://www.ncbi.nlm.nih.gov/pubmed/28225825 http://dx.doi.org/10.1371/journal.pone.0171773 https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. CC0 PDM Research Article Text 2017 ftpubmed https://doi.org/10.1371/journal.pone.0171773 2017-03-12T01:05:09Z Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged from 37.1 to 62.6 mm in total length. The band counts in these individuals were either identical to their absolute ages, or only failed to agree by a few months, which demonstrates the accuracy of this method. Precision and bias were estimated graphically using Chang’s index (Coefficient of Variation = 5.03%). High accuracy and precision between readers and low ageing bias indicate that longitudinal sections of eyestalks can be used to age krill in wild samples and to develop age-based stock assessment models for krill. Archival samples preserved in formalin (5%) and stored in ambient conditions were also readable. Ageing preserved krill will provide the opportunity to examine changes in growth among krill populations within the Southern Ocean and to retrospectively examine changes in krill production over the last century to better understand the historical and future impacts of climate change on this critical Southern Ocean species. Text Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean PubMed Central (PMC) Antarctic Southern Ocean PLOS ONE 12 2 e0171773 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Research Article |
spellingShingle |
Research Article Kilada, Raouf Reiss, Christian S. Kawaguchi, So King, Robert A. Matsuda, Tsuyoshi Ichii, Taro Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
topic_facet |
Research Article |
description |
Using known-age Antarctic krill (Euphausia superba) grown from eggs hatched at two different laboratories, we validate the annual pattern of bands deposited in the eyestalks of krill and determine the absolute age of these animals. Ages two through five years were validated, and these animals ranged from 37.1 to 62.6 mm in total length. The band counts in these individuals were either identical to their absolute ages, or only failed to agree by a few months, which demonstrates the accuracy of this method. Precision and bias were estimated graphically using Chang’s index (Coefficient of Variation = 5.03%). High accuracy and precision between readers and low ageing bias indicate that longitudinal sections of eyestalks can be used to age krill in wild samples and to develop age-based stock assessment models for krill. Archival samples preserved in formalin (5%) and stored in ambient conditions were also readable. Ageing preserved krill will provide the opportunity to examine changes in growth among krill populations within the Southern Ocean and to retrospectively examine changes in krill production over the last century to better understand the historical and future impacts of climate change on this critical Southern Ocean species. |
format |
Text |
author |
Kilada, Raouf Reiss, Christian S. Kawaguchi, So King, Robert A. Matsuda, Tsuyoshi Ichii, Taro |
author_facet |
Kilada, Raouf Reiss, Christian S. Kawaguchi, So King, Robert A. Matsuda, Tsuyoshi Ichii, Taro |
author_sort |
Kilada, Raouf |
title |
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
title_short |
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
title_full |
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
title_fullStr |
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
title_full_unstemmed |
Validation of band counts in eyestalks for the determination of age of Antarctic krill, Euphausia superba |
title_sort |
validation of band counts in eyestalks for the determination of age of antarctic krill, euphausia superba |
publisher |
Public Library of Science |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5321404/ http://www.ncbi.nlm.nih.gov/pubmed/28225825 https://doi.org/10.1371/journal.pone.0171773 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5321404/ http://www.ncbi.nlm.nih.gov/pubmed/28225825 http://dx.doi.org/10.1371/journal.pone.0171773 |
op_rights |
https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication. |
op_rightsnorm |
CC0 PDM |
op_doi |
https://doi.org/10.1371/journal.pone.0171773 |
container_title |
PLOS ONE |
container_volume |
12 |
container_issue |
2 |
container_start_page |
e0171773 |
_version_ |
1766257206087385088 |