FN Archimer Export Format
PT J
TI Phytoplankton assemblages and characterization of a Dinophysis acuminata population during an upwelling-downwelling cycle
BT 
AF GONZALEZ-GIL, Sonsoles
   VELO-SUAREZ, Lourdes
   GENTIEN, Patrick
   RAMILO, Isabel
   REGUERA, Beatriz
AS 1:1;2:1;3:2;4:1;5:1;
FF 1:;2:;3:PDG-DPCP;4:;5:;
C1 Inst Espanol Oceanog, Ctr Oceanog Vigo, Vigo 36200, Spain.
   IFREMER, Ctr Brest, DYNECO, F-29280 Plouzane, France.
C2 IEO, SPAIN
   IFREMER, FRANCE
SI BREST
SE PDG-DPCP
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 2.089
TC 21
UR https://archimer.ifremer.fr/doc/00002/11296/7822.pdf
LA English
DT Article
DE ;Harmful algal blooms;Plankton communities;Dinophysis acuminata;Myrionecta rubra;Predator-prey interactions
AB The distributions of Dinophysis acuminata, its potential prey Myrionecta rubra, and the microplankton populations associated with them, were studied in Ria de Pontevedra (NW Spain) during a 2 wk cruise that covered an upwelling-downwelling cycle, and during intensive sampling over 21 h at the end of the cruise. Special attention was focused on the characterization and physiological condition of D. acuminata. There was vertical segregation between a phytoplankton assemblage that was dominated by upwelling-promoted diatoms and another assemblage that was dominated by small dinoflagellates, located in the warmer surface layer (0 to 5 m) where D. acuminata was observed. High spatio-temporal variability was observed in the frequency of cells containing starch granules (indicating photosynthetic activity) and digestive vacuoles (indicating heterotrophic feeding); this pattern corresponded with the apparent availability of M rubra cells. Populations of D. acuminata and M rubra have their own niches and distinct responses to physical forcing, but both are located in common water masses and occasionally meet. Changes in vacuolation of D. acuminata were followed by a substantial increase (similar to 35 %) in cellular volume. D. acuminata did not exhibit daily migratory behaviour, and expressed a high division rate (0.51 d(-1)) under downwelling conditions. This work sheds new light on the relation between D. acuminata populations and its potential prey, and on its ecophysiology; it also questions previous assumptions about the environment that is suitable for its development.
PY 2010
SO Aquatic Microbial Ecology
SN 0948-3055
PU Inter-research
VL 58
IS 3
UT 000275496100006
BP 273
EP 286
DI 10.3354/ame01372
ID 11296
ER

EF