(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005
The South Georgia region supports a large biomass of krill that is subject to high interannual variability. The apparent lack of a locally self-maintaining krill population at South Georgia means that understanding the mechanism underlying these observed population characteristics is essential to su...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.819015 2024-09-15T18:05:12+00:00 (Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 Reid, Keith Watkins, Jon L Murphy, Eugene J Trathan, Phil N Fielding, Sophie Enderlein, Peter LATITUDE: -53.840000 * LONGITUDE: -38.460000 * DATE/TIME START: 2000-10-29T00:00:00 * DATE/TIME END: 2005-03-31T00:00:00 2010 text/tab-separated-values, 48 data points https://doi.pangaea.de/10.1594/PANGAEA.819015 https://doi.org/10.1594/PANGAEA.819015 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.819015 https://doi.org/10.1594/PANGAEA.819015 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Reid, Keith; Watkins, Jon L; Murphy, Eugene J; Trathan, Phil N; Fielding, Sophie; Enderlein, Peter (2010): Krill population dynamics at South Georgia: implications for ecosystem-based fisheries management. Marine Ecology Progress Series, 399, 243-252, https://doi.org/10.3354/meps08356 Coefficient DATE/TIME ECHO Echosounder Euphausia superba biomass International Polar Year (2007-2008) IPY South_Georgia_NW South Georgia Island Time coverage dataset 2010 ftpangaea https://doi.org/10.1594/PANGAEA.81901510.3354/meps08356 2024-07-24T02:31:32Z The South Georgia region supports a large biomass of krill that is subject to high interannual variability. The apparent lack of a locally self-maintaining krill population at South Georgia means that understanding the mechanism underlying these observed population characteristics is essential to successful ecosystem-based management of krill fishery in the region. Krill acoustic-density data from surveys conducted in the early, middle and late period of the summers of 2001 to 2005, together with krill population size structure over the same period from predator diet data, were used with a krill population dynamics model to evaluate potential mechanisms behind the observed changes in krill biomass. Krill abundance was highest during the middle of the summer in 3 years and in the late period in 2 years; in the latter there was evidence that krill recruitment was delayed by several months. A model scenario that included empirically derived estimates of both the magnitude and timing of recruitment in each year showed the greatest correlation with the acoustic series. The results are consistent with a krill population with allochthonous recruitment entering a retained adult population; i.e. oceanic transport of adult krill does not appear to be the major factor determining the dynamics of the adult population. The results highlight the importance of the timing of recruitment, especially where this could introduce a mismatch between the peak of krill abundance and the peak demand from predators, which may exacerbate the effects of changes in krill populations arising from commercial harvesting and/or climate change. Dataset Euphausia superba International Polar Year IPY South Georgia Island PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-38.460000,-38.460000,-53.840000,-53.840000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Coefficient DATE/TIME ECHO Echosounder Euphausia superba biomass International Polar Year (2007-2008) IPY South_Georgia_NW South Georgia Island Time coverage |
spellingShingle |
Coefficient DATE/TIME ECHO Echosounder Euphausia superba biomass International Polar Year (2007-2008) IPY South_Georgia_NW South Georgia Island Time coverage Reid, Keith Watkins, Jon L Murphy, Eugene J Trathan, Phil N Fielding, Sophie Enderlein, Peter (Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
topic_facet |
Coefficient DATE/TIME ECHO Echosounder Euphausia superba biomass International Polar Year (2007-2008) IPY South_Georgia_NW South Georgia Island Time coverage |
description |
The South Georgia region supports a large biomass of krill that is subject to high interannual variability. The apparent lack of a locally self-maintaining krill population at South Georgia means that understanding the mechanism underlying these observed population characteristics is essential to successful ecosystem-based management of krill fishery in the region. Krill acoustic-density data from surveys conducted in the early, middle and late period of the summers of 2001 to 2005, together with krill population size structure over the same period from predator diet data, were used with a krill population dynamics model to evaluate potential mechanisms behind the observed changes in krill biomass. Krill abundance was highest during the middle of the summer in 3 years and in the late period in 2 years; in the latter there was evidence that krill recruitment was delayed by several months. A model scenario that included empirically derived estimates of both the magnitude and timing of recruitment in each year showed the greatest correlation with the acoustic series. The results are consistent with a krill population with allochthonous recruitment entering a retained adult population; i.e. oceanic transport of adult krill does not appear to be the major factor determining the dynamics of the adult population. The results highlight the importance of the timing of recruitment, especially where this could introduce a mismatch between the peak of krill abundance and the peak demand from predators, which may exacerbate the effects of changes in krill populations arising from commercial harvesting and/or climate change. |
format |
Dataset |
author |
Reid, Keith Watkins, Jon L Murphy, Eugene J Trathan, Phil N Fielding, Sophie Enderlein, Peter |
author_facet |
Reid, Keith Watkins, Jon L Murphy, Eugene J Trathan, Phil N Fielding, Sophie Enderlein, Peter |
author_sort |
Reid, Keith |
title |
(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
title_short |
(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
title_full |
(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
title_fullStr |
(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
title_full_unstemmed |
(Table 1) Krill (Euphausia superba) biomass estimates at South Georgia Island from 2001-2005 |
title_sort |
(table 1) krill (euphausia superba) biomass estimates at south georgia island from 2001-2005 |
publisher |
PANGAEA |
publishDate |
2010 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.819015 https://doi.org/10.1594/PANGAEA.819015 |
op_coverage |
LATITUDE: -53.840000 * LONGITUDE: -38.460000 * DATE/TIME START: 2000-10-29T00:00:00 * DATE/TIME END: 2005-03-31T00:00:00 |
long_lat |
ENVELOPE(-38.460000,-38.460000,-53.840000,-53.840000) |
genre |
Euphausia superba International Polar Year IPY South Georgia Island |
genre_facet |
Euphausia superba International Polar Year IPY South Georgia Island |
op_source |
Supplement to: Reid, Keith; Watkins, Jon L; Murphy, Eugene J; Trathan, Phil N; Fielding, Sophie; Enderlein, Peter (2010): Krill population dynamics at South Georgia: implications for ecosystem-based fisheries management. Marine Ecology Progress Series, 399, 243-252, https://doi.org/10.3354/meps08356 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.819015 https://doi.org/10.1594/PANGAEA.819015 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81901510.3354/meps08356 |
_version_ |
1810442788631740416 |