Egg-release behaviour in Antarctic krill
The process of egg release is a complex and crucial step in the life cycle of euphausiids, especially with regards mortality and recruitment success. We examined this process in Antarctic krill (Euphausia superba) in terms of the functioning of the female genital apparatus and associated swimming be...
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ftinsu:oai:HAL:hal-03505015v1 2024-02-11T09:57:59+01:00 Egg-release behaviour in Antarctic krill Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. 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) 2009 https://hal.science/hal-03505015 https://doi.org/10.1007/s00300-009-0617-2 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-009-0617-2 hal-03505015 https://hal.science/hal-03505015 doi:10.1007/s00300-009-0617-2 Polar Biology https://hal.science/hal-03505015 Polar Biology, 2009, 32 (8), pp.1187-1194. ⟨10.1007/s00300-009-0617-2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2009 ftinsu https://doi.org/10.1007/s00300-009-0617-2 2024-01-24T17:30:19Z The process of egg release is a complex and crucial step in the life cycle of euphausiids, especially with regards mortality and recruitment success. We examined this process in Antarctic krill (Euphausia superba) in terms of the functioning of the female genital apparatus and associated swimming behaviour. A tethering technique combined with video analysis was used to make observations of three females during the release process. We found eggs were steadily extruded over a period of up to 10 h, during which time the krill released between 1,600 and 4,000 eggs and the ovary reduced by a half in length and a third in height. Eggs were mainly released individually or, less commonly, in batches of between 2 and 4 eggs. Release rates were between 5 and 30 eggs min(-1). The steady release of eggs fits well with histological evidence that mature oocytes must pass individually through tight genital ducts with narrow apertures, before coming in to close contact with the sperm plug for fertilisation, and then expulsion from the thelycum as fertilised eggs. During spawning, the female alternated between slow and rapid rates of pleopod beating with egg release occurring at the moment of beat acceleration. At the point of release, the descent of the egg was accelerated through downward beats of the 7th thoracic leg. The cyclic pattern in pleopod beat-rate during spawning may alter swimming performance and contribute to the widely reported sex- and maturity-based biases within krill swarms. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology Institut national des sciences de l'Univers: HAL-INSU Antarctic Polar Biology 32 8 1187 1194 |
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, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. Egg-release behaviour in Antarctic krill |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
The process of egg release is a complex and crucial step in the life cycle of euphausiids, especially with regards mortality and recruitment success. We examined this process in Antarctic krill (Euphausia superba) in terms of the functioning of the female genital apparatus and associated swimming behaviour. A tethering technique combined with video analysis was used to make observations of three females during the release process. We found eggs were steadily extruded over a period of up to 10 h, during which time the krill released between 1,600 and 4,000 eggs and the ovary reduced by a half in length and a third in height. Eggs were mainly released individually or, less commonly, in batches of between 2 and 4 eggs. Release rates were between 5 and 30 eggs min(-1). The steady release of eggs fits well with histological evidence that mature oocytes must pass individually through tight genital ducts with narrow apertures, before coming in to close contact with the sperm plug for fertilisation, and then expulsion from the thelycum as fertilised eggs. During spawning, the female alternated between slow and rapid rates of pleopod beating with egg release occurring at the moment of beat acceleration. At the point of release, the descent of the egg was accelerated through downward beats of the 7th thoracic leg. The cyclic pattern in pleopod beat-rate during spawning may alter swimming performance and contribute to the widely reported sex- and maturity-based biases within krill swarms. |
author2 |
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, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. |
author_facet |
Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. |
author_sort |
Tarling, Geraint Andrew |
title |
Egg-release behaviour in Antarctic krill |
title_short |
Egg-release behaviour in Antarctic krill |
title_full |
Egg-release behaviour in Antarctic krill |
title_fullStr |
Egg-release behaviour in Antarctic krill |
title_full_unstemmed |
Egg-release behaviour in Antarctic krill |
title_sort |
egg-release behaviour in antarctic krill |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-03505015 https://doi.org/10.1007/s00300-009-0617-2 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology |
op_source |
Polar Biology https://hal.science/hal-03505015 Polar Biology, 2009, 32 (8), pp.1187-1194. ⟨10.1007/s00300-009-0617-2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-009-0617-2 hal-03505015 https://hal.science/hal-03505015 doi:10.1007/s00300-009-0617-2 |
op_doi |
https://doi.org/10.1007/s00300-009-0617-2 |
container_title |
Polar Biology |
container_volume |
32 |
container_issue |
8 |
container_start_page |
1187 |
op_container_end_page |
1194 |
_version_ |
1790593520550019072 |