FN Archimer Export Format
PT J
TI Motility and autotoxicity in Karenia mikimotoi (Dinophyceae)
BT 
AF GENTIEN, Patrick
   LUNVEN, Michel
   LAZURE, Pascal
   YOUENOU, Agnes
   CRASSOUS, Marie-Pierre
AS 1:1;2:1;3:1;4:1;5:1;
FF 1:PDG-DOP-DCB-DYNECO-PELAGOS;2:PDG-DOP-DCB-DYNECO-PELAGOS;3:PDG-DOP-DCB-DYNECO-PHYSED;4:PDG-DOP-DCB-DYNECO-PELAGOS;5:PDG-DOP-DCB-ERT-IC;
C1 IFREMER, DYNECO, Ctr Brest, F-29280 Plouzane, France.
C2 IFREMER, FRANCE
SI BREST
SE PDG-DOP-DCB-DYNECO-PELAGOS
   PDG-DOP-DCB-DYNECO-PHYSED
   PDG-DOP-DCB-ERT-IC
IN WOS Ifremer jusqu'en 2018
IF 5.529
TC 74
UR https://archimer.ifremer.fr/doc/2007/publication-2436.pdf
LA English
DT Article
AB 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).
PY 2007
PD NOV
SO Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
SN 0962-8436
PU The Royal Society
VL 362
IS 1487
UT 000250224500002
BP 1937
EP 1946
DI 10.1098/rstb.2007.2079
ID 2436
ER

EF