Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae
International audience The high concentration of adult Antarctic krill Euphausia superba Dana around South Georgia, Antarctica, is a product of immigration and not local recruitment. We investigated whether reproduction and early larval development are the cause of local recruitment failure. It was...
Published in: | Marine Ecology Progress Series |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
|
Subjects: | |
Online Access: | https://hal.science/hal-03504963 https://hal.science/hal-03504963/document https://hal.science/hal-03504963/file/m331p161.pdf https://doi.org/10.3354/meps331161 |
id |
ftinsu:oai:HAL:hal-03504963v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-03504963v1 2024-02-11T09:57:10+01:00 Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae Tarling, G. A. Cuzin-Roudy, J. Thorpe, S. E. Shreeve, R. S. Ward, P. Murphy, E. J. British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2007 https://hal.science/hal-03504963 https://hal.science/hal-03504963/document https://hal.science/hal-03504963/file/m331p161.pdf https://doi.org/10.3354/meps331161 en eng HAL CCSD Inter Research info:eu-repo/semantics/altIdentifier/doi/10.3354/meps331161 hal-03504963 https://hal.science/hal-03504963 https://hal.science/hal-03504963/document https://hal.science/hal-03504963/file/m331p161.pdf doi:10.3354/meps331161 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-03504963 Marine Ecology Progress Series, 2007, 331, pp.161-179. ⟨10.3354/meps331161⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2007 ftinsu https://doi.org/10.3354/meps331161 2024-01-24T17:30:17Z International audience The high concentration of adult Antarctic krill Euphausia superba Dana around South Georgia, Antarctica, is a product of immigration and not local recruitment. We investigated whether reproduction and early larval development are the cause of local recruitment failure. It was found that the majority of adult females were reproductively active in summer and that there was a comparatively high investment in the ovary, reaching up to 46% of the total wet weight of the krill. The corresponding egg batches were amongst the largest ever reported for E. superba. A semi-empirical model predicted that 11% of females completed just 1 spawning episode per year, 60% completed 2, and 29% completed 3 or more. On average, a South Georgian krill released 12 343 eggs yr(-1). The eggs were unable to complete the descent-ascent developmental cycle on-shelf because the bathymetry was too shallow but, off-shelf, they were predicted to sink to between 490 and 520 m and return to the surface either as a metanauplius or 1st calyptopis stage with plenty of energy reserves remaining. Feeding conditions were adequate for the development of later larval stages once these reserves were exhausted. Although net surveys found calyptopis and early stage furcilia in the vicinity of South Georgia, numbers were mostly lower than predicted. Overall, reproduction or early stage development are successful in this region, leaving predation on larvae and advective export during winter as the main potential causes of local recruitment failure. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba Institut national des sciences de l'Univers: HAL-INSU Antarctic Marine Ecology Progress Series 331 161 179 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Tarling, G. A. Cuzin-Roudy, J. Thorpe, S. E. Shreeve, R. S. Ward, P. Murphy, E. J. Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The high concentration of adult Antarctic krill Euphausia superba Dana around South Georgia, Antarctica, is a product of immigration and not local recruitment. We investigated whether reproduction and early larval development are the cause of local recruitment failure. It was found that the majority of adult females were reproductively active in summer and that there was a comparatively high investment in the ovary, reaching up to 46% of the total wet weight of the krill. The corresponding egg batches were amongst the largest ever reported for E. superba. A semi-empirical model predicted that 11% of females completed just 1 spawning episode per year, 60% completed 2, and 29% completed 3 or more. On average, a South Georgian krill released 12 343 eggs yr(-1). The eggs were unable to complete the descent-ascent developmental cycle on-shelf because the bathymetry was too shallow but, off-shelf, they were predicted to sink to between 490 and 520 m and return to the surface either as a metanauplius or 1st calyptopis stage with plenty of energy reserves remaining. Feeding conditions were adequate for the development of later larval stages once these reserves were exhausted. Although net surveys found calyptopis and early stage furcilia in the vicinity of South Georgia, numbers were mostly lower than predicted. Overall, reproduction or early stage development are successful in this region, leaving predation on larvae and advective export during winter as the main potential causes of local recruitment failure. |
author2 |
British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Tarling, G. A. Cuzin-Roudy, J. Thorpe, S. E. Shreeve, R. S. Ward, P. Murphy, E. J. |
author_facet |
Tarling, G. A. Cuzin-Roudy, J. Thorpe, S. E. Shreeve, R. S. Ward, P. Murphy, E. J. |
author_sort |
Tarling, G. A. |
title |
Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
title_short |
Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
title_full |
Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
title_fullStr |
Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
title_full_unstemmed |
Recruitment of Antarctic krill Euphausia superba in the South Georgia region: adult fecundity and the fate of larvae |
title_sort |
recruitment of antarctic krill euphausia superba in the south georgia region: adult fecundity and the fate of larvae |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-03504963 https://hal.science/hal-03504963/document https://hal.science/hal-03504963/file/m331p161.pdf https://doi.org/10.3354/meps331161 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica Euphausia superba |
op_source |
ISSN: 0171-8630 EISSN: 1616-1599 Marine Ecology Progress Series https://hal.science/hal-03504963 Marine Ecology Progress Series, 2007, 331, pp.161-179. ⟨10.3354/meps331161⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps331161 hal-03504963 https://hal.science/hal-03504963 https://hal.science/hal-03504963/document https://hal.science/hal-03504963/file/m331p161.pdf doi:10.3354/meps331161 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3354/meps331161 |
container_title |
Marine Ecology Progress Series |
container_volume |
331 |
container_start_page |
161 |
op_container_end_page |
179 |
_version_ |
1790609240102010880 |