Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure
Inter-oceanic differences in macrozooplankton(euphausiids, amphipods, cnidarians and chaetognaths) biomass and community structure were studied in four regions(northern Japan Sea, southern Okhotsk Sea, Donan and Doto areas of North Pacific) around Hokkaido Island. Whole zooplankton biomass ranged be...
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北海道大学大学院水産科学研究院
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Online Access: | http://hdl.handle.net/2115/67026 https://doi.org/10.14943/bull.fish.67.2.25 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/67026 2023-05-15T17:52:34+02:00 Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure Tomiyama, Kosuke Matsuno, Kohei Abe, Yoshiyuki Shimada, Hiroshi Yamaguchi, Atsushi http://hdl.handle.net/2115/67026 https://doi.org/10.14943/bull.fish.67.2.25 eng eng 北海道大学大学院水産科学研究院 http://hdl.handle.net/2115/67026 doi:10.14943/bull.fish.67.2.25 北海道大学水産科学研究彙報, 67(2): 25-34 Amphipod Euphausiid Chaetognath Cnidarian Top-down Bottom-up 660 bulletin (article) fthokunivhus https://doi.org/10.14943/bull.fish.67.2.25 2022-11-18T01:04:25Z Inter-oceanic differences in macrozooplankton(euphausiids, amphipods, cnidarians and chaetognaths) biomass and community structure were studied in four regions(northern Japan Sea, southern Okhotsk Sea, Donan and Doto areas of North Pacific) around Hokkaido Island. Whole zooplankton biomass ranged between 25 and 315 g WM m-2 and was significantly higher in the southern Okhotsk Sea. Macrozooplankton composed 5-15% of the whole zooplankton biomass. Across all macrozooplankton taxa, the number of species varied with region : the fewest species(2-4 species) were in the southern Okhotsk Sea, followed by the northern Japan Sea(3-5 species), and the most species(4-9 species) were in the Donan and Doto areas of the North Pacific. Depth topography and thermal conditions are considered possible causes of the differences in species richness across regions. Through inter-oceanic comparison, marine ecosystem characteristics of each region were evaluated. The zooplankton community in the northern Japan Sea was characterized by a predominance of carnivorous macrozooplankton taxa(amphipods, cnidarians and chaetognaths) and fewer herbivorous taxa(euphausiids and mesozooplankton), and it was determined to be as a top-down controlled ecosystem. In contrast, in the southern Okhotsk Sea, the zooplankton community was predominated by herbivorous mesozooplankton and euphausiids, and the marine ecosystem was determined to be a bottom-up control region. In the North Pacific, zooplankton community in the Doto area was predominated by chaetognaths. The zooplankton community in the Donan area showed mixed characteristics of the Doto area and the northern Japan Sea because of the seasonal water mass exchange from these two regions. Article in Journal/Newspaper okhotsk sea Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Okhotsk Pacific |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Amphipod Euphausiid Chaetognath Cnidarian Top-down Bottom-up 660 |
spellingShingle |
Amphipod Euphausiid Chaetognath Cnidarian Top-down Bottom-up 660 Tomiyama, Kosuke Matsuno, Kohei Abe, Yoshiyuki Shimada, Hiroshi Yamaguchi, Atsushi Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
topic_facet |
Amphipod Euphausiid Chaetognath Cnidarian Top-down Bottom-up 660 |
description |
Inter-oceanic differences in macrozooplankton(euphausiids, amphipods, cnidarians and chaetognaths) biomass and community structure were studied in four regions(northern Japan Sea, southern Okhotsk Sea, Donan and Doto areas of North Pacific) around Hokkaido Island. Whole zooplankton biomass ranged between 25 and 315 g WM m-2 and was significantly higher in the southern Okhotsk Sea. Macrozooplankton composed 5-15% of the whole zooplankton biomass. Across all macrozooplankton taxa, the number of species varied with region : the fewest species(2-4 species) were in the southern Okhotsk Sea, followed by the northern Japan Sea(3-5 species), and the most species(4-9 species) were in the Donan and Doto areas of the North Pacific. Depth topography and thermal conditions are considered possible causes of the differences in species richness across regions. Through inter-oceanic comparison, marine ecosystem characteristics of each region were evaluated. The zooplankton community in the northern Japan Sea was characterized by a predominance of carnivorous macrozooplankton taxa(amphipods, cnidarians and chaetognaths) and fewer herbivorous taxa(euphausiids and mesozooplankton), and it was determined to be as a top-down controlled ecosystem. In contrast, in the southern Okhotsk Sea, the zooplankton community was predominated by herbivorous mesozooplankton and euphausiids, and the marine ecosystem was determined to be a bottom-up control region. In the North Pacific, zooplankton community in the Doto area was predominated by chaetognaths. The zooplankton community in the Donan area showed mixed characteristics of the Doto area and the northern Japan Sea because of the seasonal water mass exchange from these two regions. |
format |
Article in Journal/Newspaper |
author |
Tomiyama, Kosuke Matsuno, Kohei Abe, Yoshiyuki Shimada, Hiroshi Yamaguchi, Atsushi |
author_facet |
Tomiyama, Kosuke Matsuno, Kohei Abe, Yoshiyuki Shimada, Hiroshi Yamaguchi, Atsushi |
author_sort |
Tomiyama, Kosuke |
title |
Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
title_short |
Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
title_full |
Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
title_fullStr |
Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
title_full_unstemmed |
Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure |
title_sort |
inter-oceanic differences in macrozooplankton biomas and community structure in four regions around hokkaido island, japan : consequences for marine ecosystem structure |
publisher |
北海道大学大学院水産科学研究院 |
url |
http://hdl.handle.net/2115/67026 https://doi.org/10.14943/bull.fish.67.2.25 |
geographic |
Okhotsk Pacific |
geographic_facet |
Okhotsk Pacific |
genre |
okhotsk sea |
genre_facet |
okhotsk sea |
op_relation |
http://hdl.handle.net/2115/67026 doi:10.14943/bull.fish.67.2.25 北海道大学水産科学研究彙報, 67(2): 25-34 |
op_doi |
https://doi.org/10.14943/bull.fish.67.2.25 |
_version_ |
1766160124015017984 |