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  1. Article ; Online: Particle-attached Microbes in Eelgrass Vegetation Areas Differ in Community Structure Depending on the Distance from the Eelgrass Bed.

    Iqbal, Md Mehedi / Nishimura, Masahiko / Sano, Masayoshi / Yoshizawa, Susumu

    Microbes and environments

    2023  Volume 38, Issue 3

    Abstract: Zostera marina (eelgrass) is a submerged flowering plant often found in the coastal areas of Japan. Large amounts of suspended particles form in highly productive environments, such as eelgrass beds, and the behavior of these particles is expected to ... ...

    Abstract Zostera marina (eelgrass) is a submerged flowering plant often found in the coastal areas of Japan. Large amounts of suspended particles form in highly productive environments, such as eelgrass beds, and the behavior of these particles is expected to affect the surrounding microbial community. We investigated the microbial community structure of suspended particles in three eelgrass fields (Ikuno-Shima Is., Mutsu Bay, and Nanao Bay) and inferred the formation and dynamics of suspended particles from a microbial community structure ana-lysis. Seawater samples were collected directly above each eelgrass bed (eelgrass-covering) and from locations dozens of meters away from the eelgrass bed (bare-ground). In consideration of the two different lifestyles of marine microbes, microbial communities were obtained from particle-attached (PA) and free-living (FL) states. Differences in microbial diversity and community structures were observed between PA and FL in all eelgrass beds. The FL microbial community was similar between the two sampling points (eelgrass-covering and bare-ground), whereas a significant difference was noted in the microbial community structure of suspended particles between the two sampling points. This difference appeared to be due to the supply of organic matter from the eelgrass sea ground and leaf-attached detritus produced by microbial activity. In addition, the classes Flavobacteriia, Alphaproteobacteria, and Gammaproteobacteria were abundant in the PA and FL fractions. Furthermore, many sequences of the key groups (e.g., Planctomycetes and Verrucomicrobia) were exclusively detected in the PA fraction, in which they may circulate nutrients. The present results provide insights into the microbial communities of suspended particles and provide the first step towards understanding their biogeochemical impact on the eelgrass bed.
    MeSH term(s) Cell Death ; Gammaproteobacteria ; Japan ; Magnoliopsida ; Microbiota
    Language English
    Publishing date 2023-09-03
    Publishing country Japan
    Document type Journal Article
    ISSN 1347-4405
    ISSN (online) 1347-4405
    DOI 10.1264/jsme2.ME23013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Biogeochemical characteristics of brash sea ice and icebergs during summer and autumn in the Indian sector of the Southern Ocean

    Nomura, Daiki / Sahashi, Reishi / Takahashi, Keigo D. / Makabe, Ryosuke / Ito, Masato / Tozawa, Manami / Wongpan, Pat / Matsuda, Ryo / Sano, Masayoshi / Yamamoto-Kawai, Michiyo / Nojiro, Natsumi / Tachibana, Aiko / Kurosawa, Norio / Moteki, Masato / Tamura, Takeshi / Aoki, Shigeru / Murase, Hiroto

    Progress in Oceanography. 2023 Apr. 14, p.103023-

    2023  , Page(s) 103023–

    Abstract: We analyzed biogeochemical components of brash ice, originating from sea ice and icebergs, collected in the Indian sector of the Southern Ocean during the summer and autumn of 2018–2020. Ice samples, collected from seawater by net or cage methods, were ... ...

    Abstract We analyzed biogeochemical components of brash ice, originating from sea ice and icebergs, collected in the Indian sector of the Southern Ocean during the summer and autumn of 2018–2020. Ice samples, collected from seawater by net or cage methods, were melted in the dark under cool conditions to measure physical and biogeochemical components such as salinity, stable oxygen isotopes, nutrients, and chlorophyll-a. We compared brash ice parameters with those of seawater samples from the temperature minimum layer, corresponding to the water in which the sea ice originated, to examine the effects of processes such as brine drainage, snow-ice formation, and biological activities on the biogeochemical components in sea ice. Samples from icebergs (ice formed on land) had salinity of zero and low concentrations of all other components, suggesting that the atmospheric deposition of nutrients is minimal in this clean environment. However, sea ice samples had a wide range of values for each parameter. Our results show that meteoric water makes a smaller contribution to sea ice than it typically does to multi-year landfast ice, and there is no correlation between this meteoric water contribution and nutrient concentrations, which suggests that the contribution of snow-ice formation to nutrients within sea ice is subordinate to the role of biological processes. Nutrient and chlorophyll-a concentrations in our brash ice samples are of similar magnitude to those in sea ice samples collected in the same area by coring of thick pack ice. Our data represent end-member values that may be useful to estimate the respective contributions of snow, sea ice, and seawater to surface water samples.
    Keywords atmospheric deposition ; autumn ; cages ; chlorophyll ; drainage ; oceanography ; oxygen ; salinity ; sea ice ; seawater ; snow ; summer ; surface water ; temperature ; icebergs ; nutrients ; melting ; Southern Ocean
    Language English
    Dates of publication 2023-0414
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Pre-press version
    ISSN 0079-6611
    DOI 10.1016/j.pocean.2023.103023
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Diversity and Composition of Microbial Communities in an Eelgrass (Zostera marina) Bed in Tokyo Bay, Japan.

    Iqbal, Md Mehedi / Nishimura, Masahiko / Haider, Md Nurul / Sano, Masayoshi / Ijichi, Minoru / Kogure, Kazuhiro / Yoshizawa, Susumu

    Microbes and environments

    2021  Volume 36, Issue 4

    Abstract: Zostera marina (eelgrass) is a widespread seagrass species that forms diverse and productive habitats along coast lines throughout much of the northern hemisphere. The present study investigated the microbial consortia of Z. marina growing at Futtsu clam- ...

    Abstract Zostera marina (eelgrass) is a widespread seagrass species that forms diverse and productive habitats along coast lines throughout much of the northern hemisphere. The present study investigated the microbial consortia of Z. marina growing at Futtsu clam-digging beach, Chiba prefecture, Japan. The following environmental samples were collected: sediment, seawater, plant leaves, and the root-rhizome. Sediment and seawater samples were obtained from three sampling points: inside, outside, and at the marginal point of the eelgrass bed. The microbial composition of each sample was analyzed using 16S ribosomal gene amplicon sequencing. Microbial communities on the dead (withered) leaf surface markedly differed from those in sediment, but were similar to those in seawater. Eelgrass leaves and surrounding seawater were dominated by the bacterial taxa Rhodobacterales (Alphaproteobacteria), whereas Rhodobacterales were a minor group in eelgrass sediment. Additionally, we speculated that the order Sphingomonadales (Alphaproteobacteria) acts as a major degrader during the decomposition process and constantly degrades eelgrass leaves, which then spread into the surrounding seawater. Withered eelgrass leaves did not accumulate on the surface sediment because they were transported out of the eelgrass bed by wind and residual currents unique to the central part of Tokyo Bay.
    MeSH term(s) Bays/microbiology ; Japan ; Microbiota ; Tokyo ; Water Microbiology ; Zosteraceae/microbiology
    Language English
    Publishing date 2021-10-13
    Publishing country Japan
    Document type Journal Article
    ISSN 1347-4405
    ISSN (online) 1347-4405
    DOI 10.1264/jsme2.ME21037
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Biogeochemical characteristics of brash sea ice and icebergs during summer and autumn in the Indian sector of the Southern Ocean

    Nomura, Daiki / Sahashi, Reishi / Takahashi, Keigo D. / Makabe, Ryosuke / Ito, Masato / Tozawa, Manami / Wongpan, Pat / Matsuda, Ryo / Sano, Masayoshi / Yamamoto-Kawai, Michiyo / Nojiro, Natsumi / Tachibana, Aiko / Kurosawa, Norio / Moteki, Masato / Tamura, Takeshi / Aoki, Shigeru / Murase, Hiroto

    2023  

    Abstract: We analyzed biogeochemical components of brash ice, originating from sea ice and icebergs, collected in the Indian sector of the Southern Ocean during the summer and autumn of 2018–2020. Ice samples, collected from seawater by net or cage methods, were ... ...

    Abstract We analyzed biogeochemical components of brash ice, originating from sea ice and icebergs, collected in the Indian sector of the Southern Ocean during the summer and autumn of 2018–2020. Ice samples, collected from seawater by net or cage methods, were melted in the dark under cool conditions to measure physical and biogeochemical components such as salinity, stable oxygen isotopes, nutrients, and chlorophyll-a. We compared brash ice parameters with those of seawater samples from the temperature minimum layer, corresponding to the water in which the sea ice originated, to examine the effects of processes such as brine drainage, snow-ice formation, and biological activities on the biogeochemical components in sea ice. Samples from icebergs (ice formed on land) had salinity of zero and low concentrations of all other components, suggesting that the atmospheric deposition of nutrients is minimal in this clean environment. However, sea ice samples had a wide range of values for each parameter. Our results show that meteoric water makes a smaller contribution to sea ice than it typically does to multi-year landfast ice, and there is no correlation between this meteoric water contribution and nutrient concentrations, which suggests that the contribution of snow-ice formation to nutrients within sea ice is subordinate to the role of biological processes. Nutrient and chlorophyll-a concentrations in our brash ice samples are of similar magnitude to those in sea ice samples collected in the same area by coring of thick pack ice. Our data represent end-member values that may be useful to estimate the respective contributions of snow, sea ice, and seawater to surface water samples.
    Subject code 290 ; 551
    Language English
    Publisher Elsevier
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Feeding habits of mesopelagic copepods in Sagami Bay: Insights from integrative analysis

    Sano, Masayoshi / Koh Maki / Shuhei Nishida / Toshi Nagata / Yuichiro Nishibe

    Progress in oceanography. 2013 Mar., v. 110

    2013  

    Abstract: We investigated the feeding habits of mesopelagic copepods in Sagami Bay during a spring bloom, focusing on omnivorous copepods of the families Aetideidae, Metridinidae, Scolecitrichidae, and Spinocalanidae by integrative application of stable-isotope ( ... ...

    Abstract We investigated the feeding habits of mesopelagic copepods in Sagami Bay during a spring bloom, focusing on omnivorous copepods of the families Aetideidae, Metridinidae, Scolecitrichidae, and Spinocalanidae by integrative application of stable-isotope (SI) analysis, microscopic observation of gut contents, elemental analysis of gut contents and sinking particles with an electron probe micro analyzer (EPMA), and morphological analysis of mouthparts. The SI ratios (δ13C and δ15N) of most mesopelagic species that initially were assumed to feed mainly on marine snow (sinking particles) were allocated within the SI plots that were assumed for the consumers of particulate organic matter from the epipelagic zone. Microscopy showed different compositions of gut contents among the copepods, most of which ingested marine snow containing incompletely degraded phytoplankton and cyanobacteria. According to the EPMA analysis, percentages of terrigenous mineral particles in marine snow were significantly higher than those in most of the copepod guts, suggesting selective ingestion of sinking particles by these copepods. Morphological analysis showed that mouthparts of most of the copepods were not suitable for fine-particle feeding. These mesopelagic copepods were distributed mostly below 50m, where Chl-a was essentially depleted. These observations suggest feeding specialization among mesopelagic omnivorous copepods, as well as their selective ingestion of fresher particles and/or parts among diverse fractions of marine snow.
    Keywords digestive system ; ingestion ; marine sediments ; Metridinidae ; microscopy ; mouthparts ; organic matter ; phytoplankton ; spring ; stable isotopes
    Language English
    Dates of publication 2013-03
    Size p. 11-26.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0079-6611
    DOI 10.1016/j.pocean.2013.01.004
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Feeding habits of mesopelagic copepods in Sagami Bay: Insights from integrative analysis

    Sano, Masayoshi / Maki, Koh / Nishibe, Yuichiro / Nagata, Toshi / Nishida, Shuhei

    Progress in oceanography

    Volume v. 110

    Abstract: We investigated the feeding habits of mesopelagic copepods in Sagami Bay during a spring bloom, focusing on omnivorous copepods of the families Aetideidae, Metridinidae, Scolecitrichidae, and Spinocalanidae by integrative application of stable-isotope ( ... ...

    Abstract We investigated the feeding habits of mesopelagic copepods in Sagami Bay during a spring bloom, focusing on omnivorous copepods of the families Aetideidae, Metridinidae, Scolecitrichidae, and Spinocalanidae by integrative application of stable-isotope (SI) analysis, microscopic observation of gut contents, elemental analysis of gut contents and sinking particles with an electron probe micro analyzer (EPMA), and morphological analysis of mouthparts. The SI ratios (δ¹³C and δ¹⁵N) of most mesopelagic species that initially were assumed to feed mainly on marine snow (sinking particles) were allocated within the SI plots that were assumed for the consumers of particulate organic matter from the epipelagic zone. Microscopy showed different compositions of gut contents among the copepods, most of which ingested marine snow containing incompletely degraded phytoplankton and cyanobacteria. According to the EPMA analysis, percentages of terrigenous mineral particles in marine snow were significantly higher than those in most of the copepod guts, suggesting selective ingestion of sinking particles by these copepods. Morphological analysis showed that mouthparts of most of the copepods were not suitable for fine-particle feeding. These mesopelagic copepods were distributed mostly below 50m, where Chl-a was essentially depleted. These observations suggest feeding specialization among mesopelagic omnivorous copepods, as well as their selective ingestion of fresher particles and/or parts among diverse fractions of marine snow.
    Keywords marine sediments ; ingestion ; Metridinidae ; phytoplankton ; mouthparts ; digestive system ; microscopy ; organic matter ; spring ; stable isotopes
    Language English
    Document type Article
    ISSN 0079-6611
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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