TY - JOUR
T1 - Comparison of radiolarian vertical distributions in the Okhotsk Sea near the Kuril Islands and in the northwestern North Pacific off Hokkaido Island
AU - Okazaki, Yusuke
AU - Takahashi, Kozo
AU - Itaki, Takuya
AU - Kawasaki, Yasuhiro
N1 - Funding Information:
We thank the captain, crew, and scientists of the R/V Hokko-maru Cruise HK95-08, Hokkaido National Fisheries Research Institute for their assistance in plankton-net sampling. Special thanks are due to Mr. N. Fujitani of Hokkaido Tokai University who participated in the plankton tow sampling employed in this study. We are grateful to Prof. K.R. Bjørklund of Universitetet I Oslo and Dr. G. Cortese of AWI for their valuable comments, suggestions, and information to improve our manuscript. We appreciate Dr. E. Thomas of Wesleyan University for English editing of the manuscript. This study was funded by the following research programs of MEXT: Grants-in-Aid-for Scientific Research B2 Project No. 10480128, No. 15310001, B1 Project No. 13440152 and the GCMAPS program. YO received a partial fund from Prof. Tatsuro Matsumoto Scholarship Fund.
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2004/6
Y1 - 2004/6
N2 - The vertical distribution of radiolarians was investigated by using a closing-type net with 63 μm mesh in the Okhotsk Sea (Station NU'2, near Bussol' Strait) down to 1000 m depth and in the northwestern North Pacific (Oyashio region, Station X) down to 500 m depth. Both stations were sampled in September 1995. Radiolarian standing stocks were high between 50 and 200 m at both stations, and generally decreased with depth. The depth-integrated living total radiolarian standing stock from 0 to 500 m at Station NU'2 was more than three times higher than that at Station X. The maximum standing stocks of polycystine radiolarians occurred in the 50-100 m depth interval, but there were also significant abundance peaks of phaeodarian radiolarians in the 100-200 m interval at both stations. The radiolarian production is likely to be associated with not only phytoplankton production in upper waters, but also with microbial production in intermediate waters. A total of 79 taxa were encountered: 25 Spumellaria, 41 Nassellaria, and 13 Phaeodaria. Five radiolarian groups were obtained based on R-mode cluster analysis: Group A: lower intermediate water dwellers (300-1000 m), Group B: taxa with different distributions in the Okhotsk Sea (300-1000 m) and in the Oyashio region (0-100 m), Group C: upper intermediate water dwellers (200-500 m), Group D: surface-subsurface water dwellers (0-200 m), and Group E: taxa with pronounced 200 m.
AB - The vertical distribution of radiolarians was investigated by using a closing-type net with 63 μm mesh in the Okhotsk Sea (Station NU'2, near Bussol' Strait) down to 1000 m depth and in the northwestern North Pacific (Oyashio region, Station X) down to 500 m depth. Both stations were sampled in September 1995. Radiolarian standing stocks were high between 50 and 200 m at both stations, and generally decreased with depth. The depth-integrated living total radiolarian standing stock from 0 to 500 m at Station NU'2 was more than three times higher than that at Station X. The maximum standing stocks of polycystine radiolarians occurred in the 50-100 m depth interval, but there were also significant abundance peaks of phaeodarian radiolarians in the 100-200 m interval at both stations. The radiolarian production is likely to be associated with not only phytoplankton production in upper waters, but also with microbial production in intermediate waters. A total of 79 taxa were encountered: 25 Spumellaria, 41 Nassellaria, and 13 Phaeodaria. Five radiolarian groups were obtained based on R-mode cluster analysis: Group A: lower intermediate water dwellers (300-1000 m), Group B: taxa with different distributions in the Okhotsk Sea (300-1000 m) and in the Oyashio region (0-100 m), Group C: upper intermediate water dwellers (200-500 m), Group D: surface-subsurface water dwellers (0-200 m), and Group E: taxa with pronounced 200 m.
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U2 - 10.1016/j.marmicro.2004.01.003
DO - 10.1016/j.marmicro.2004.01.003
M3 - Article
AN - SCOPUS:2942566656
VL - 51
SP - 257
EP - 284
JO - Marine Micropaleontology
JF - Marine Micropaleontology
SN - 0377-8398
IS - 3-4
ER -