Settling fluxes of suspended particulate matter estimated from sediment trap catches in Hiroshima Bay.

SEIKI, Thoru; Date, Etsuji; Izawa, Hirofumi

doi:10.2965/jswe1978.8.304

Cited by 9 publications

(3 citation statements)

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“…area of the Seto Inland Sea are similar to values in the Chukchi and northern Bering Seas (Seiki et al 1985). In addition, macrobenthic biomass is only 56 g wet weight m Ϫ2 in the Seto Inland Sea (Hashimoto et al 1997), in contrast to levels of 118-2,377 g wet weight m Ϫ2 in the benthos of the Bering Shelf-Anadyr Water (Grebmeier et al 1988).…”

Section: Acknowledgmentsmentioning

confidence: 71%

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses

Takai

Mishima

Yorozu

et al. 2002

Limnology & Oceanography

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The relative importance of benthic and pelagic primary production for demersal fish and some invertebrates in the western Seto Inland Sea of Japan was examined using carbon and nitrogen stable isotope analyses. A few fishes, such as juvenile black rockfish Sebastes inermis and large Japanese anchovies Engraulis japonicus, had isotopic carbon signatures similar to pelagic particulate organic matter (Ϫ20.1 Ϯ 1.7‰), which indicates that their food was derived from production in the water column. However, 92% of the 401 demersal fish that were analyzed had ␦ 13 C signatures (Ϫ17.0 to Ϫ13.0‰) similar to those of benthic crustaceans, epilithic microphytobenthos, and macroalgae and unlike the signature of pelagic particulate organic matter or zooplankton. These results suggest that in the Seto Inland Sea there is not a tight coupling between pelagic primary production and the food web of demersal fishes, but rather that these fishes are dependent on carbon from benthic primary production.

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Section: Acknowledgmentsmentioning

confidence: 71%

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses

Takai

Mishima

Yorozu

et al. 2002

Limnology & Oceanography

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“…As a consequence of that freshwater input, heterogeneities occur within the bay: (i) concentrations of particulate organic carbon in the surface layer are higher near the coast than towards the outer bay; (ii) concentrations of bacterioplankton in surface layers are higher near the coast (O.D., unpubl. data); and (iii) settling fluxes are governed by vertical circulation of water rather than gravity, and are therefore higher towards the outer bay than near the coast [26]. Bacterioplankton abundance was typical of eutrophic waters and within the range previously reported in Hiroshima Bay [9].…”

Section: Discussionmentioning

confidence: 74%

Abundance of Naked Amoebae in Sediments of Hiroshima Bay, Seto Inland Sea of Japan

Decamp

Tsujino

Kamiyama

1999

J Eukaryotic Microbiology

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The present paper provides the first data on naked amoebae from sediments of Hiroshima Bay. Three stations in the inner part of the bay were sampled over a three‐month period. Abundance of naked amoebae ranged from 1,019 to 45,561 cells/g dry sediment. Results indicate: (i) surface sediment populations in most cases were higher than subsurface populations; (ii) there was some evidence of temporal variation with counts generally increasing from March to May: and (iii) the site located near Hiroshima City had fewer amoebae on several occasions than the other two sites. There was a negative exponential relationship between acid‐volatile sulfide concentration and abundance of amoebae. Most amoebae were small with the average size ranging from 6.6–14 μm. Morphotype 1, amoebae that extend lobose pseudopodia or subpseudopodia during normal locomotion, were dominant (40–100% of enumerated amoebae). Morphotypes 2 and 3 (limax amoebae) were found in lower numbers than the other two morphotypes. The proportion of amoebae occupied by Morphotype 4 (fan‐shaped or discoidal‐flattened amoebae) was higher at a lower total abundance.

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“…The COD of sediments which is electron donners of the sulfate reducing ranged 42 to 57 mg g -1 and was higher than that of other stations (Table 2). In Hiroshima Bay, the apparent setting velocities of particulate matter that mainly originated from primary production become highest in October in correspondence with the beginning of vertical mixing (Seiki et al, 1985). The weight ratio of TOC to total organic nitrogen (C/Norg.…”

Section: Discussionmentioning

confidence: 99%

Spatial distribution of hydrogen sulfide and sulfur species in coastal marine sediments Hiroshima Bay, Japan

Asaoka

Umehara

Otani

et al. 2018

Marine Pollution Bulletin

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This study aims to reveal spatial distribution of hydrogen sulfide and sulfur species in marine sediments in Hiroshima Bay, Japan, by direct analyses using a combination of detection tubes and X-ray absorption fine structure spectroscopy. In summer and autumn, the hydrogen sulfide concentration ranged from <0.1 to 4 mg-S L. In this study, only hydrogen sulfide was observed in autumn and at two stations in summer. In contrast, some earlier studies reported in all seasons in Hiroshima Bay the presence of acid volatile sulfide, which is used as a proxy of sulfide content. The sulfur species in sediments were mainly identified as sulfate, thiosulfate, elemental sulfur, and pyrite. Thiosulfate was a minor component compared to the other sulfur species. The formation of pyrite and sulfur derived from hydrogen sulfide oxidation played an important role in the scavenging of hydrogen sulfide.

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Settling fluxes of suspended particulate matter estimated from sediment trap catches in Hiroshima Bay.

Cited by 9 publications

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Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses

Abundance of Naked Amoebae in Sediments of Hiroshima Bay, Seto Inland Sea of Japan

Spatial distribution of hydrogen sulfide and sulfur species in coastal marine sediments Hiroshima Bay, Japan

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Settling fluxes of suspended particulate matter estimated from sediment trap catches in Hiroshima Bay.

Cited by 9 publications

References 0 publications

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ13C and δ15N analyses

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ13C and δ15N analyses

Abundance of Naked Amoebae in Sediments of Hiroshima Bay, Seto Inland Sea of Japan

Spatial distribution of hydrogen sulfide and sulfur species in coastal marine sediments Hiroshima Bay, Japan

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Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses

Carbon sources for demersal fish in the western Seto Inland Sea, Japan, examined by δ¹³C and δ¹⁵N analyses