タイトル |
-
en
Latitudinal Differences in the Planktonic Biomass and Community Structure Down to the Greater Depths in the Western North Pacific
|
作成者 |
-
-
-
-
-
-
-
-
-
-
en
Mac Takahashi, Masayuki
|
アクセス権 |
open access |
権利情報 |
-
en
The final publication is available at Springer via http://dx.doi.org/10.1007/s10872-004-5770-1.
|
主題 |
-
Other
en
Plankton
-
Other
en
community structure
-
Other
en
vertical distribution
-
Other
en
mesopelagic
-
Other
en
bethypelagic
-
Other
en
abyssopelagic
-
Other
en
biological pump
-
Other
ja
biogeochemical cycle
-
NDC
660
|
内容注記 |
-
Abstract
en
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.
|
出版者 |
en
Oceanographic Society of Japan
|
日付 |
|
言語 |
|
資源タイプ |
journal article |
出版タイプ |
AM |
資源識別子 |
HDL
http://hdl.handle.net/2115/60645
|
関連 |
-
isVersionOf
DOI
https://doi.org/10.1007/s10872-004-5770-1
|
収録誌情報 |
-
-
PISSN
0916-8370
-
EISSN
1573-868X
-
NCID
AA10833529
-
en
Journal of Oceanography
-
巻60
号4
開始ページ773
終了ページ787
|
ファイル |
|
コンテンツ更新日時 |
2023-07-26 |