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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第67巻 第2号 >

Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/bull.fish.67.2.25

Title: Inter-oceanic differences in macrozooplankton biomas and community structure in four regions around Hokkaido Island, Japan : consequences for marine ecosystem structure
Authors: Tomiyama, Kosuke Browse this author
Matsuno, Kohei Browse this author →KAKEN DB
Abe, Yoshiyuki Browse this author
Shimada, Hiroshi Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Keywords: Amphipod
Euphausiid
Chaetognath
Cnidarian
Top-down
Bottom-up
Issue Date: 10-Aug-2017
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 67
Issue: 2
Start Page: 25
End Page: 34
Abstract: 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.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/67026
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第67巻 第2号

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