External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba)
Levels of infestation by the suctorian Ephelota sp. were determined in Antarctic krill taken in the north-eastern region of the Scotia sea, close to the island of South Georgia. Individuals caught in summer between 2002 and 2004 were measured for body length, eye diameter, moult stage, sex, sexual m...
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ftinsu:oai:HAL:hal-03494367v1 2024-02-11T09:56:25+01:00 External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) Tarling, G. A. Cuzin-Roudy, 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) 2008 https://hal.science/hal-03494367 https://doi.org/10.1007/s00300-007-0339-2 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-007-0339-2 hal-03494367 https://hal.science/hal-03494367 doi:10.1007/s00300-007-0339-2 Polar Biology https://hal.science/hal-03494367 Polar Biology, 2008, 31 (2), pp.121-130. ⟨10.1007/s00300-007-0339-2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2008 ftinsu https://doi.org/10.1007/s00300-007-0339-2 2024-01-24T17:30:30Z Levels of infestation by the suctorian Ephelota sp. were determined in Antarctic krill taken in the north-eastern region of the Scotia sea, close to the island of South Georgia. Individuals caught in summer between 2002 and 2004 were measured for body length, eye diameter, moult stage, sex, sexual maturity and number of suctorian parasites. All krill samples were found to contain at least two modal size-classes and the complete range of maturity- and moult stages. Sample analysis for the different characters identified moult stage as an important determinant of infestation by Ephelota sp., with 66% of those about to moult (pre-moult individuals) being infested compared with 0% of post-moult individuals. Multiple Correspondence Analysis also identified a strong link between age and degree of suctorian infestation with large-eyed (and hence old) males having very high numbers of suctorian bodies. Moulting is costly in terms of energy and vulnerability, but it is believed that krill moult at relatively high rates throughout their life to facilitate growth and ``shrinkage''. Here, we demonstrate that the control of external parasitism is also a major advantage of moulting at high frequency. The capacity of krill to maintain a high moult rate decreases with age, leading to older krill enduring higher parasitic loads. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology Scotia Sea Institut national des sciences de l'Univers: HAL-INSU Antarctic Scotia Sea Polar Biology 31 2 121 130 |
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. External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
Levels of infestation by the suctorian Ephelota sp. were determined in Antarctic krill taken in the north-eastern region of the Scotia sea, close to the island of South Georgia. Individuals caught in summer between 2002 and 2004 were measured for body length, eye diameter, moult stage, sex, sexual maturity and number of suctorian parasites. All krill samples were found to contain at least two modal size-classes and the complete range of maturity- and moult stages. Sample analysis for the different characters identified moult stage as an important determinant of infestation by Ephelota sp., with 66% of those about to moult (pre-moult individuals) being infested compared with 0% of post-moult individuals. Multiple Correspondence Analysis also identified a strong link between age and degree of suctorian infestation with large-eyed (and hence old) males having very high numbers of suctorian bodies. Moulting is costly in terms of energy and vulnerability, but it is believed that krill moult at relatively high rates throughout their life to facilitate growth and ``shrinkage''. Here, we demonstrate that the control of external parasitism is also a major advantage of moulting at high frequency. The capacity of krill to maintain a high moult rate decreases with age, leading to older krill enduring higher parasitic loads. |
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. |
author_facet |
Tarling, G. A. Cuzin-Roudy, J. |
author_sort |
Tarling, G. A. |
title |
External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
title_short |
External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
title_full |
External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
title_fullStr |
External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
title_full_unstemmed |
External parasite infestation depends on moult-frequency and age in Antarctic krill (Euphausia superba) |
title_sort |
external parasite infestation depends on moult-frequency and age in antarctic krill (euphausia superba) |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-03494367 https://doi.org/10.1007/s00300-007-0339-2 |
geographic |
Antarctic Scotia Sea |
geographic_facet |
Antarctic Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology Scotia Sea |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology Scotia Sea |
op_source |
Polar Biology https://hal.science/hal-03494367 Polar Biology, 2008, 31 (2), pp.121-130. ⟨10.1007/s00300-007-0339-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-007-0339-2 hal-03494367 https://hal.science/hal-03494367 doi:10.1007/s00300-007-0339-2 |
op_doi |
https://doi.org/10.1007/s00300-007-0339-2 |
container_title |
Polar Biology |
container_volume |
31 |
container_issue |
2 |
container_start_page |
121 |
op_container_end_page |
130 |
_version_ |
1790602953367748608 |