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Okumura Y, Furutono T, Ito K, Hara M. Influence of submarine topography and sediment environment on microbial assemblages in a coastal lagoon in northeastern Japan. MARINE POLLUTION BULLETIN 2023; 194:115404. [PMID: 37591020 DOI: 10.1016/j.marpolbul.2023.115404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 07/10/2023] [Accepted: 08/06/2023] [Indexed: 08/19/2023]
Abstract
The relationships among eutrophication, anoxia, and microbial distribution were investigated for Nagatsura-Ura Lagoon on the northeastern Pacific coast of Japan. In September 2017, the bottom environment in a small area of the inner part of the lagoon (which has a basin-shaped bottom topology) was eutrophic and anoxic, with high carbon, nitrogen, phosphate, acid-volatile sulfide, and low dissolved oxygen and oxidation-reduction potential. Dissolved oxygen levels improved during the winter. Bacillariophyta (diatoms) were the main organic component according to pigment analysis and next-generation sequencing of nucleic acids in seawater samples. Phylum Proteobacteria was dominant among the bacterial flora in the sediment but the proportions of Class Epsilon-proteobacteria and Chlorobium (a green sulfur-utilizing bacterium) were high in the inner part of the lagoon compared to other stations, and these groups were also present in winter. Apparently groups able to thrive in both anoxic and aerobic conditions were predominant in the inner part of the lagoon.
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Affiliation(s)
- Yutaka Okumura
- Fisheries Resources Institute, National Research and Development Agency, Japan Fisheries Research and Education Agency, 3-27-5 Shinhama, Shiogama, Miyagi 985-0001, Japan.
| | - Tarou Furutono
- IDEA Consultants Inc., 1-1-11, Nishikimachi, Aoba, Sendai, Miyagi 980-0012, Japan
| | - Kinuko Ito
- Graduate School of Agricultural Science, Tohoku University, 468-1, Aramaki, Aoba, Aoba, Sendai, Miyagi 980-0845 Japan
| | - Motoyuki Hara
- Graduate School of Agricultural Science, Tohoku University, 468-1, Aramaki, Aoba, Aoba, Sendai, Miyagi 980-0845 Japan
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Miyamoto H, Kawachi N, Kurotani A, Moriya S, Suda W, Suzuki K, Matsuura M, Tsuji N, Nakaguma T, Ishii C, Tsuboi A, Shindo C, Kato T, Udagawa M, Satoh T, Wada S, Masuya H, Miyamoto H, Ohno H, Kikuchi J. Computational estimation of sediment symbiotic bacterial structures of seagrasses overgrowing downstream of onshore aquaculture. ENVIRONMENTAL RESEARCH 2023; 219:115130. [PMID: 36563976 DOI: 10.1016/j.envres.2022.115130] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 12/14/2022] [Accepted: 12/18/2022] [Indexed: 05/02/2023]
Abstract
Coastal seagrass meadows are essential in blue carbon and aquatic ecosystem services. However, this ecosystem has suffered severe eutrophication and destruction due to the expansion of aquaculture. Therefore, methods for the flourishing of seagrass are still being explored. Here, data from 49 public coastal surveys on the distribution of seagrass and seaweed around the onshore aquaculture facilities are revalidated, and an exceptional area where the seagrass Zostera marina thrives was found near the shore downstream of the onshore aquaculture facility. To evaluate the characteristics of the sediment for growing seagrass, physicochemical properties and bacterial ecological evaluations of the sediment were conducted. Evaluation of chemical properties in seagrass sediments confirmed a significant increase in total carbon and a decrease in zinc content. Association analysis and linear discriminant analysis refined bacterial candidates specified in seagrass overgrown- and nonovergrown-sediment. Energy landscape analysis indicated that the symbiotic bacterial groups of seagrass sediment were strongly affected by the distance close to the seagrass-growing aquaculture facility despite their bacterial population appearing to fluctuate seasonally. The bacterial population there showed an apparent decrease in the pathogen candidates belonging to the order Flavobacteriales. Moreover, structure equation modeling and a linear non-Gaussian acyclic model based on the machine learning data estimated an optimal sediment symbiotic bacterial group candidate for seagrass growth as follows: the Lachnospiraceae and Ruminococcaceae families as gut-inhabitant bacteria, Rhodobacteraceae as photosynthetic bacteria, and Desulfobulbaceae as cable bacteria modulating oxygen or nitrate reduction and oxidation of sulfide. These observations confer a novel perspective on the sediment symbiotic bacterial structures critical for blue carbon and low-pathogenic marine ecosystems in aquaculture.
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Affiliation(s)
- Hirokuni Miyamoto
- Graduate School of Horticulture, Chiba University: Matsudo, Chiba, 271-8501, Japan; RIKEN Center for Integrated Medical Science, Yokohama, Kanagawa, 230-0045, Japan; Japan Eco-science (Nikkan Kagaku) Co. Ltd.: Chiba, Chiba, 263-8522, Japan; Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan.
| | | | - Atsushi Kurotani
- Research Center for Agricultural Information Technology, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, 305-0856, Japan
| | - Shigeharu Moriya
- RIKEN, Center for Advanced Photonics, Wako, Saitama, 351-0198, Japan
| | - Wataru Suda
- RIKEN Center for Integrated Medical Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Kenta Suzuki
- RIKEN, BioResource Research Center, Tsukuba, Ibaraki, 305-0074, Japan
| | - Makiko Matsuura
- Graduate School of Horticulture, Chiba University: Matsudo, Chiba, 271-8501, Japan; Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan
| | - Naoko Tsuji
- Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan
| | - Teruno Nakaguma
- Graduate School of Horticulture, Chiba University: Matsudo, Chiba, 271-8501, Japan; Japan Eco-science (Nikkan Kagaku) Co. Ltd.: Chiba, Chiba, 263-8522, Japan; Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan
| | - Chitose Ishii
- RIKEN Center for Integrated Medical Science, Yokohama, Kanagawa, 230-0045, Japan; Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan
| | - Arisa Tsuboi
- Japan Eco-science (Nikkan Kagaku) Co. Ltd.: Chiba, Chiba, 263-8522, Japan
| | - Chie Shindo
- Research Center for Agricultural Information Technology, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, 305-0856, Japan
| | - Tamotsu Kato
- RIKEN Center for Integrated Medical Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Motoaki Udagawa
- Keiyo Gas Energy Solution Co. Ltd.: Ichikawa, Chiba, 272-0033, Japan
| | - Takashi Satoh
- Division of Hematology, Kitasato University School of Allied Health Sciences, Sagamihara, Kanagawa, 252-0329, Japan
| | - Satoshi Wada
- RIKEN, Center for Advanced Photonics, Wako, Saitama, 351-0198, Japan
| | - Hiroshi Masuya
- RIKEN, BioResource Research Center, Tsukuba, Ibaraki, 305-0074, Japan
| | - Hisashi Miyamoto
- Sermas Co., Ltd.: Ichikawa, Chiba, 272-0033, Japan; Miroku Co.Ltd.: Kitsuki, Oita, 873-0021, Japan
| | - Hiroshi Ohno
- RIKEN Center for Integrated Medical Science, Yokohama, Kanagawa, 230-0045, Japan
| | - Jun Kikuchi
- RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, 230-0045, Japan.
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Murata H, Fujii T, Yonezawa C. Evaluating the effect of the incidence angle of ALOS-2 PALSAR-2 on detecting aquaculture facilities for sustainable use of coastal space and resources. PeerJ 2023; 11:e14649. [PMID: 36632139 PMCID: PMC9828279 DOI: 10.7717/peerj.14649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 12/06/2022] [Indexed: 01/09/2023] Open
Abstract
Background Driven by the growing world population, aquaculture plays a key role in meeting the increasing demand for food. However, aquaculture facilities in Japan are widely installed in coastal waters where natural disasters, such as typhoons and tsunamis, might wash these facilities away, thereby interfering with maritime navigation safety. Therefore, it is imperative to efficiently monitor the state of aquaculture facilities daily, particularly after a disaster in real time. To this end, several new space-borne L-band synthetic aperture radars (SARs) continue to be launched now and in the future, whose utilizations are expected to increase nationally and internationally. An example is the Japan Aerospace Exploration Agency, currently operating a SAR that can be operated day and night, and even under cloudy conditions, called ALOS-2 PALSAR-2. Methods Based on the above facts, this study evaluated the effect of the incidence angle of ALOS-2 PALSAR-2 HH single-polarization data, using 3 m spatial resolution, on aquaculture raft detection. As the study site, we selected Ago Bay, located on the Pacific coast of Mie Prefecture in central Japan since the Nankai Trough Megathrust Earthquake and tsunamis have been predicted to occur in the future around this area. Then, we analyzed the sigma zero (backscattering coefficient) of aquaculture rafts and their surrounding sea surfaces, including the relationships between satellite orbits and aquaculture raft directions. Results Investigations revealed that the optimum incidence angle for detecting aquaculture rafts in this study was 33.8°-45.1°. Differences in the sigma zero values existed between the ascending and descending orbits. However, the incidence angles differed on the orbits. Then, differences in the median sigma zero values across a range of incidence angles were evaluated under the descending orbit. In addition, when the directions of the aquaculture rafts were closely perpendicular to the satellite orbit, aquaculture rafts tended to show the highest values of sigma zero due to Bragg resonance scattering. Hence, this knowledge may allow for the rapid detection of aquaculture rafts during an emergency without going on-site.
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Affiliation(s)
- Hiroki Murata
- Research Center for Advanced Science and Technology, The University of Tokyo, Tokyo, Japan,Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Toyonobu Fujii
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
| | - Chinatsu Yonezawa
- Graduate School of Agricultural Science, Tohoku University, Sendai, Japan
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