Spatial distribution of the toxic dinoflagellate Alexandrium tamarense in summer in the Okhotsk Sea off Hokkaido, Japan

To investigate the mechanisms influencing the spatial distribution of the toxic dinoflagellate Alexandrium tamarense in the Okhotsk Sea off Hokkaido, Japan, intensive field surveys were conducted at 34 - 37 stations in late July every year from in 2002 - 2007. Alexandrium tamarense occurred every ye...

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Bibliographic Details
Published in:Plankton & benthos research 2010/02/25, Vol.5(1), pp.1-10
Main Authors: Shimada, H., Hokkaido. Central Fisheries Experiment Station, Yoichi (Japan), Sawada, M, Kuribayashi, T, Nakata, A, Miyazono, A, Asami, H
Format: Article
Language:English
Subjects:
Alexandrium tamarense
COQUILLAGES ET CRUSTACES
DENSIDAD DE LA POBLACION
DENSITE DE POPULATION
DINOPHYCEAE
DISTRIBUCION ESPACIAL
DISTRIBUTION SPATIALE
ETE
FOSFATOS (SALES)
Hokkaido
http://www.fao.org/aos/agrovoc#c_33692
http://www.fao.org/aos/agrovoc#c_36230
http://www.fao.org/aos/agrovoc#c_5801
http://www.fao.org/aos/agrovoc#c_6112
http://www.fao.org/aos/agrovoc#c_6898
http://www.fao.org/aos/agrovoc#c_7033
http://www.fao.org/aos/agrovoc#c_7519
MAR DE OKHOTSK
Marine
MARISCOS
MER D'OKHOTSK
Nutrients
Okhotsk Sea
PHOSPHATE (SEL)
PHOSPHATES (SALTS)
POPULATION DENSITY
SEA OF OKHOTSK
SHELLFISH
SPATIAL DISTRIBUTION
SUMMER
VERANO
Water mass
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Summary:To investigate the mechanisms influencing the spatial distribution of the toxic dinoflagellate Alexandrium tamarense in the Okhotsk Sea off Hokkaido, Japan, intensive field surveys were conducted at 34 - 37 stations in late July every year from in 2002 - 2007. Alexandrium tamarense occurred every year. However, the abundance of A. tamarense fluctuated year by year, with extremely low cell densities of A. tamarense in 2005. High abundances of A. tamarense were found frequently in the oceanic area of the surface low-salinity water (LSW, salinity = 32.5) and the mixed water (MW). Low abundances were found along the coastal area of the Soya Warm Current (SWC, salinity = 33.6) and in the dichothermal water (DTW, temperature = 2degC) in the layer of oceanic areas deeper than 30 m. The PO4-P concentration in each water mass was in the order DTW MW LSW SWC and the lowest PO4-P concentration that occurred in the SWC is considered to be a potential limiting factor for the growth of A. tamarense. The reason for the low A. tamarense abundance in the DTW is considered to be the low water temperature and low light intensity. It is concluded that the water mass of LSW has favorable conditions for the growth of A. tamarense. The relative frequency of each water mass fluctuated every year and the results suggest that the frequency of occurrence of the LSW and MW is one of the most significant factors controlling the abundance of A. tamarense in the area.
ISSN:1880-8247
1882-627X
DOI:10.3800/pbr.5.1