Motility and autotoxicity in Karenia mikimotoi (Dinophyceae)
Karenia mikimotoi is one of the most common red-tide dinoflagellates proliferating in the eastern North Atlantic and around Japan. Kills of marine fauna are associated with its blooms. In mixed water columns it migrates vertically, while in stratified water columns, the population remains confined w...
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Online Access: | https://archimer.ifremer.fr/doc/2007/publication-2436.pdf https://doi.org/10.1098/rstb.2007.2079 https://archimer.ifremer.fr/doc/00000/2436/ |
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ftarchimer:oai:archimer.ifremer.fr:2436 2023-05-15T17:33:33+02:00 Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) Gentien, Patrick Lunven, Michel Lazure, Pascal Youenou, Agnes Crassous, Marie-pierre 2007-11 application/pdf https://archimer.ifremer.fr/doc/2007/publication-2436.pdf https://doi.org/10.1098/rstb.2007.2079 https://archimer.ifremer.fr/doc/00000/2436/ eng eng The Royal Society https://archimer.ifremer.fr/doc/2007/publication-2436.pdf doi:10.1098/rstb.2007.2079 https://archimer.ifremer.fr/doc/00000/2436/ 2007 Royal Society info:eu-repo/semantics/openAccess restricted use Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences (0962-8436) (The Royal Society), 2007-11 , Vol. 362 , N. 1487 , P. 1937-1946 text Publication info:eu-repo/semantics/article 2007 ftarchimer https://doi.org/10.1098/rstb.2007.2079 2021-09-23T20:14:45Z Karenia mikimotoi is one of the most common red-tide dinoflagellates proliferating in the eastern North Atlantic and around Japan. Kills of marine fauna are associated with its blooms. In mixed water columns it migrates vertically, while in stratified water columns, the population remains confined within pycnocline layers. Wind events, increasing mixing and agitation initiate declines in its populations. This paper is focused on the formulation of mortality rate relative to shear rate. Autotoxicity is demonstrated by the use of a synthetic toxin. Bioconvection observed in cultures allows the establishment of a trade-off between phototropism, which leads to the local accumulation of cells, and their autotoxicity, which would prevent cell concentration. The combination of these processes allows diffusion of the toxin into the underlying water, where it subsequently degrades. Confinement of the population in the pycnocline layer results also from another trade-off between growth conditions and shear-rate-modulated mortality. A simplified encounter kernel was introduced into the population dynamics equation to account for a mortality factor. Under realistic forcing conditions with a small number of parameters, this model reproduced the confinement of the population in the pycnocline layer, the proper timing and the duration of the recurrent K. mikimotoi bloom on the Ushant front (France). Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Philosophical Transactions of the Royal Society B: Biological Sciences 362 1487 1937 1946 |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
Karenia mikimotoi is one of the most common red-tide dinoflagellates proliferating in the eastern North Atlantic and around Japan. Kills of marine fauna are associated with its blooms. In mixed water columns it migrates vertically, while in stratified water columns, the population remains confined within pycnocline layers. Wind events, increasing mixing and agitation initiate declines in its populations. This paper is focused on the formulation of mortality rate relative to shear rate. Autotoxicity is demonstrated by the use of a synthetic toxin. Bioconvection observed in cultures allows the establishment of a trade-off between phototropism, which leads to the local accumulation of cells, and their autotoxicity, which would prevent cell concentration. The combination of these processes allows diffusion of the toxin into the underlying water, where it subsequently degrades. Confinement of the population in the pycnocline layer results also from another trade-off between growth conditions and shear-rate-modulated mortality. A simplified encounter kernel was introduced into the population dynamics equation to account for a mortality factor. Under realistic forcing conditions with a small number of parameters, this model reproduced the confinement of the population in the pycnocline layer, the proper timing and the duration of the recurrent K. mikimotoi bloom on the Ushant front (France). |
format |
Article in Journal/Newspaper |
author |
Gentien, Patrick Lunven, Michel Lazure, Pascal Youenou, Agnes Crassous, Marie-pierre |
spellingShingle |
Gentien, Patrick Lunven, Michel Lazure, Pascal Youenou, Agnes Crassous, Marie-pierre Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
author_facet |
Gentien, Patrick Lunven, Michel Lazure, Pascal Youenou, Agnes Crassous, Marie-pierre |
author_sort |
Gentien, Patrick |
title |
Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
title_short |
Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
title_full |
Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
title_fullStr |
Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
title_full_unstemmed |
Motility and autotoxicity in Karenia mikimotoi (Dinophyceae) |
title_sort |
motility and autotoxicity in karenia mikimotoi (dinophyceae) |
publisher |
The Royal Society |
publishDate |
2007 |
url |
https://archimer.ifremer.fr/doc/2007/publication-2436.pdf https://doi.org/10.1098/rstb.2007.2079 https://archimer.ifremer.fr/doc/00000/2436/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences (0962-8436) (The Royal Society), 2007-11 , Vol. 362 , N. 1487 , P. 1937-1946 |
op_relation |
https://archimer.ifremer.fr/doc/2007/publication-2436.pdf doi:10.1098/rstb.2007.2079 https://archimer.ifremer.fr/doc/00000/2436/ |
op_rights |
2007 Royal Society info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1098/rstb.2007.2079 |
container_title |
Philosophical Transactions of the Royal Society B: Biological Sciences |
container_volume |
362 |
container_issue |
1487 |
container_start_page |
1937 |
op_container_end_page |
1946 |
_version_ |
1766132105024110592 |