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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Springer Verlag
2009
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Online Access: | https://hull-repository.worktribe.com/output/396229 https://doi.org/10.1007/s00300-009-0617-2 |
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ftunivhullir:oai:hull-repository.worktribe.com:396229 2024-05-19T07:31:01+00:00 Egg-release behaviour in Antarctic krill Johnson, Magnus Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. 2009-04-02 https://hull-repository.worktribe.com/output/396229 https://doi.org/10.1007/s00300-009-0617-2 unknown Springer Verlag https://hull-repository.worktribe.com/output/396229 POLAR BIOLOGY Volume 32 Issue 8 Pagination 1187-1194 doi:https://doi.org/10.1007/s00300-009-0617-2 0722-4060 doi:10.1007/s00300-009-0617-2 General Agricultural and Biological Sciences Specialist Research - Other Energy Environment and Sustainability Journal Article 2009 ftunivhullir https://doi.org/10.1007/s00300-009-0617-2 2024-04-19T00:02:30Z 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 University of Hull: Repository@Hull Polar Biology 32 8 1187 1194 |
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Open Polar |
collection |
University of Hull: Repository@Hull |
op_collection_id |
ftunivhullir |
language |
unknown |
topic |
General Agricultural and Biological Sciences Specialist Research - Other Energy Environment and Sustainability |
spellingShingle |
General Agricultural and Biological Sciences Specialist Research - Other Energy Environment and Sustainability Johnson, Magnus Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. Egg-release behaviour in Antarctic krill |
topic_facet |
General Agricultural and Biological Sciences Specialist Research - Other Energy Environment and Sustainability |
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. |
format |
Article in Journal/Newspaper |
author |
Johnson, Magnus Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. |
author_facet |
Johnson, Magnus Tarling, Geraint Andrew Cuzin-Roudy, J. Wootton, K. Johnson, M. L. |
author_sort |
Johnson, Magnus |
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 |
Springer Verlag |
publishDate |
2009 |
url |
https://hull-repository.worktribe.com/output/396229 https://doi.org/10.1007/s00300-009-0617-2 |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Polar Biology |
op_relation |
https://hull-repository.worktribe.com/output/396229 POLAR BIOLOGY Volume 32 Issue 8 Pagination 1187-1194 doi:https://doi.org/10.1007/s00300-009-0617-2 0722-4060 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 |
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1799468850777948160 |