Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific
As part of the research program WEST-COSMIC Phase I (1997–2001), vertical profiles down to the greater depths (0–2000 m or 5800 m) of the plankton community structure composed of heterotrophic bacteria, phytoplankton, protozooplankton and metazooplankton were studied at one station in each subarctic...
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Oceanographic Society of Japan
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/60645 2023-05-15T18:28:06+02:00 Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific Yamaguchi, Atsushi Watanabe, Yuji Ishida, Hiroshi Harimoto, Takashi Furusawa, Kazushi Suzuki, Shinya Ishizaka, Joji Ikeda, Tsutomu Mac Takahashi, Masayuki http://hdl.handle.net/2115/60645 https://doi.org/10.1007/s10872-004-5770-1 eng eng Oceanographic Society of Japan http://hdl.handle.net/2115/60645 Journal of Oceanography, 60(4): 773-787 http://dx.doi.org/10.1007/s10872-004-5770-1 The final publication is available at Springer via http://dx.doi.org/10.1007/s10872-004-5770-1. Plankton community structure vertical distribution mesopelagic bethypelagic abyssopelagic biological pump biogeochemical cycle 660 article (author version) fthokunivhus https://doi.org/10.1007/s10872-004-5770-1 2022-11-18T01:03:41Z As part of the research program WEST-COSMIC Phase I (1997–2001), vertical profiles down to the greater depths (0–2000 m or 5800 m) of the plankton community structure composed of heterotrophic bacteria, phytoplankton, protozooplankton and metazooplankton were studied at one station in each subarctic (44°N) and in transitional region (39°N), and two stations in subtropical region (30°N and 25°N); all in 137–155°E in the western North Pacific Ocean. The biomass of all four taxonomic groups decreased rapidly with increasing depths at all stations, although the magnitude of depth-related decrease differed among the groups. As plankton community structure, metazooplankton biomass and bacterial biomass occupied >50% of the total in 0–2000 and 2000–4000 or 5000 m strata, respectively, at subarctic and transitional stations, while bacterial biomass contributed to >50% of the total consistently from 0 through 4800 or 5800 m at subtropical stations. Metazooplankton biomass integrated over the greater depths exhibited a clear latitudinal pattern (high north and low south), but this was not the case for those of the other taxonomic groups. As a component of metazooplankton, an appreciable contribution of diapausing copepods to the metazooplankton was noted at subarctic and transitional stations, but they were few or nil at subtropical stations. As protozooplankton assemblages, heterotrophic microflagellates (HMF) and dinoflagellates were two major components at subarctic and transitional stations, but were only HMF predominated at subtropical stations. From biomass ratios between heterotrophic bacteria, HMF and dinoflagellates, “sinking POC-DOC-heterotrophic bacteria-HMF-heterotrophic dinoflagellates” link was proposed as a microbial food chain operative in the deep layer of the western North Pacific. All results are discussed in the light of latitudinal differences in the structure and functioning of plankton community contributing to the ‘biological pump’ in the western North Pacific Ocean. Article in Journal/Newspaper Subarctic Copepods Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Pacific Journal of Oceanography 60 4 773 787 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Plankton community structure vertical distribution mesopelagic bethypelagic abyssopelagic biological pump biogeochemical cycle 660 |
spellingShingle |
Plankton community structure vertical distribution mesopelagic bethypelagic abyssopelagic biological pump biogeochemical cycle 660 Yamaguchi, Atsushi Watanabe, Yuji Ishida, Hiroshi Harimoto, Takashi Furusawa, Kazushi Suzuki, Shinya Ishizaka, Joji Ikeda, Tsutomu Mac Takahashi, Masayuki Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
topic_facet |
Plankton community structure vertical distribution mesopelagic bethypelagic abyssopelagic biological pump biogeochemical cycle 660 |
description |
As part of the research program WEST-COSMIC Phase I (1997–2001), vertical profiles down to the greater depths (0–2000 m or 5800 m) of the plankton community structure composed of heterotrophic bacteria, phytoplankton, protozooplankton and metazooplankton were studied at one station in each subarctic (44°N) and in transitional region (39°N), and two stations in subtropical region (30°N and 25°N); all in 137–155°E in the western North Pacific Ocean. The biomass of all four taxonomic groups decreased rapidly with increasing depths at all stations, although the magnitude of depth-related decrease differed among the groups. As plankton community structure, metazooplankton biomass and bacterial biomass occupied >50% of the total in 0–2000 and 2000–4000 or 5000 m strata, respectively, at subarctic and transitional stations, while bacterial biomass contributed to >50% of the total consistently from 0 through 4800 or 5800 m at subtropical stations. Metazooplankton biomass integrated over the greater depths exhibited a clear latitudinal pattern (high north and low south), but this was not the case for those of the other taxonomic groups. As a component of metazooplankton, an appreciable contribution of diapausing copepods to the metazooplankton was noted at subarctic and transitional stations, but they were few or nil at subtropical stations. As protozooplankton assemblages, heterotrophic microflagellates (HMF) and dinoflagellates were two major components at subarctic and transitional stations, but were only HMF predominated at subtropical stations. From biomass ratios between heterotrophic bacteria, HMF and dinoflagellates, “sinking POC-DOC-heterotrophic bacteria-HMF-heterotrophic dinoflagellates” link was proposed as a microbial food chain operative in the deep layer of the western North Pacific. All results are discussed in the light of latitudinal differences in the structure and functioning of plankton community contributing to the ‘biological pump’ in the western North Pacific Ocean. |
format |
Article in Journal/Newspaper |
author |
Yamaguchi, Atsushi Watanabe, Yuji Ishida, Hiroshi Harimoto, Takashi Furusawa, Kazushi Suzuki, Shinya Ishizaka, Joji Ikeda, Tsutomu Mac Takahashi, Masayuki |
author_facet |
Yamaguchi, Atsushi Watanabe, Yuji Ishida, Hiroshi Harimoto, Takashi Furusawa, Kazushi Suzuki, Shinya Ishizaka, Joji Ikeda, Tsutomu Mac Takahashi, Masayuki |
author_sort |
Yamaguchi, Atsushi |
title |
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
title_short |
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
title_full |
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
title_fullStr |
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
title_full_unstemmed |
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific |
title_sort |
latitudinal differences in the planktonic biomass and community structure down to the greater depths in the western north pacific |
publisher |
Oceanographic Society of Japan |
url |
http://hdl.handle.net/2115/60645 https://doi.org/10.1007/s10872-004-5770-1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic Copepods |
genre_facet |
Subarctic Copepods |
op_relation |
http://hdl.handle.net/2115/60645 Journal of Oceanography, 60(4): 773-787 http://dx.doi.org/10.1007/s10872-004-5770-1 |
op_rights |
The final publication is available at Springer via http://dx.doi.org/10.1007/s10872-004-5770-1. |
op_doi |
https://doi.org/10.1007/s10872-004-5770-1 |
container_title |
Journal of Oceanography |
container_volume |
60 |
container_issue |
4 |
container_start_page |
773 |
op_container_end_page |
787 |
_version_ |
1766210454643802112 |