Nitrogenous nutrition of Alexandrium catenella (Dinophyceae) in cultures and in Thau lagoon, southern France

被引:96
作者
Collos, Y
Gagne, C
Laabir, M
Vaquer, A
Cecchi, P
Souchu, P
机构
[1] Univ Montpellier 2, CNRS, UMR 5119, F-34095 Montpellier 5, France
[2] IRD, FLAG UR098, F-34394 Montpellier 5, France
[3] IFREMER, Ecol Lab, F-34203 Sete, France
关键词
Alexandrium catenella; ammonium; carbon; DON; nitrate; nitrite; lag; unbalanced growth; uptake; urea;
D O I
10.1046/j.1529-8817.2004.03034.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Alexandrium catenella (Whedon et Kofoid) Balech was isolated from Thau lagoon (northern Mediterranean) and its growth and uptake characteristics measured for nitrate, ammonium, and urea. Although affinity constants did not indicate a preference for ammonium over nitrate, there was a strong inhibition of nitrate uptake by ammonium when both nitrogen (N) sources were present. Nitrogen budgets during growth in cultures revealed major imbalances between decreases in dissolved N and increases in particulate N, indicating excretion of dissolved organic N during the early part of the growth phase and uptake during the later part. A quasi-unialgal bloom in November 2001 (4x10(6) cells.L-1) allowed measurements of uptake of nitrate, nitrite, ammonium, and urea; net and gross growth rate of A. catenella; and grazing rates on this organism. The affinity constants indicate that it is not a strong competitor for the N nutrients tested when these are in low concentrations (<10 mugat N.L-1), compared with other members of the phytoplankton community. Indirect evidence from cultures indicate that dissolved organic N compounds could be important in triggering those blooms. Finally, the strongly unbalanced growth observed in the field indicates that A. catenella exhibits a storage rather than a growth response to a nutrient pulse and is adapted to low frequency events such as the passage of frontal disturbances. The disappearance of A. catenella was due to grazing that balanced growth at the peak of the bloom.
引用
收藏
页码:96 / 103
页数:8
相关论文
共 46 条
[1]   QUANTIFYING EXTERNAL AND INTERNAL NITROGEN AND PHOSPHORUS POOLS, AS WELL AS NITROGEN AND PHOSPHORUS SUPPLIED THROUGH REMINERALIZATION, IN COASTAL MARINE PLANKTON BY MEANS OF A DILUTION TECHNIQUE [J].
ANDERSEN, T ;
SCHARTAU, AKL ;
PAASCHE, E .
MARINE ECOLOGY PROGRESS SERIES, 1991, 69 (1-2) :67-80
[2]   Harmful algal blooms and eutrophication: Nutrient sources, composition, and consequences [J].
Anderson, DM ;
Glibert, PM ;
Burkholder, JM .
ESTUARIES, 2002, 25 (4B) :704-726
[3]  
[Anonymous], 1973, HDB PHYCOLOGICAL MET
[4]  
[Anonymous], 1999, AQUAT ECOL, DOI [10.1023/A:1009925515059, DOI 10.1023/A:1009925515059]
[5]  
BENDSCHNEIDER K, 1952, J MAR RES, V11, P87
[6]  
BLASCO D, 1996, J PLANKTON RES, V8, P1971
[7]  
Boynton W.R., 1982, ESTUARINE COMP, P69
[8]   Interactions between a marine dinoflagellate (Alexandrium catenella) and a bacterial community utilizing riverine humic substances [J].
Carlsson, P ;
Edling, H ;
Bechemin, C .
AQUATIC MICROBIAL ECOLOGY, 1998, 16 (01) :65-80
[9]   NITROGEN BUDGETS AND DISSOLVED ORGANIC-MATTER CYCLING [J].
COLLOS, Y .
MARINE ECOLOGY PROGRESS SERIES, 1992, 90 (02) :201-206
[10]   An optical method for the rapid measurement of micromolar concentrations of nitrate in marine phytoplankton cultures [J].
Collos, Y ;
Mornet, F ;
Sciandra, A ;
Waser, N ;
Larson, A ;
Harrison, PJ .
JOURNAL OF APPLIED PHYCOLOGY, 1999, 11 (02) :179-184