Fiscal Year
2017
Title
Dynamics of macrobenthic community in Onagawa Bay and adjacent water areas
Project and Theme
Project 1. Study on ecological succession of fisheries ground
Representative Organization: Tohoku University
Theme1. Environmental monitoring and development of a marine habitat map for the coastal ecosystem of Onagawa Bay| Representative person | Kenji Kaneko |
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| Organization | Tohoku University |
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| Department | Graduate School of Agricultural Science |
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Theme1. Environmental monitoring and development of a marine habitat map for the coastal ecosystem of Onagawa Bay| Representative person | Akihiro Kijima |
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| Organization | Tohoku University |
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| Department | Graduate School of Agricultural Science |
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Research InformationPeriod and Interval2017/04/01 - 2018/03/31
Every month
Research Area
Onagawa Bay and Gamo Lagoon
CategoryField survey
OverviewTo understand long-term changes in macrobenthic community after the 2011 tsunami disturbance, we will conduct the survey of macrobenthos in Onagawa Bay and Gamo Lagoon. In addition, continuous observation of water temperature, salinity, dissolved oxygen and water depth will be conduct using logger set at inner part of Gamo Lagoon.
Overview of the Observation
Research Point Table
| Point | | Name | Stn 1 |
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| Coordinates | 38.436855,141.461297 |
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| Remarks | Onagawa Bay |
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| Name | Stn A |
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| Coordinates | 38.255,141.013333 |
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| Remarks | Gamo Lagoon |
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| Name | Stn C |
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| Coordinates | 38.258056,141.014722 |
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| Remarks | Gamo Lagoon |
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| Name | Stn D |
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| Coordinates | 38.259167,141.015556 |
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| Remarks | Gamo Lagoon |
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| Name | Stn E |
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| Coordinates | 38.253611,141.009167 |
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| Remarks | Gamo Lagoon |
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Results and Future PlanIn 2017, polychaetes were dominant in macrobenthic community at Onagawa Bay. Although the polychaete community seemed to return to the pre-tsunami community at the family level, it was different at the species level. Hypoxia was observed in summer season and the density of the macrobenthos had dropped and continued being in low level. In November 2016, earthquake and tsunami occurred at Fukushima offshore and macrobenthos in Gamo Lagoon suffered tsunami-related damage again. As the macrobenthic communities in both Onagawa Bay and Gamo Lagoon are still in the process of succession, monitoring should be continued.
Investigation Item and Data Acquisition
| Investigation Item | Data Acquisition |
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| Macrobenthic community in Onagawa Bay and Gamo Lagoon | Density of each taxonomic group |
Reference
Person in charge of Investigation
| Representative person | Waka Sato-Okoshi |
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| Organization | Tohoku University |
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| Department | Graduate School of Agricultural Science |
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| Fiscal Year | 2017 |
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| Organization | Tohoku University |
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| Category | Field survey |
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| Research Area | South Sanriku
Ishinomaki Bay
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| Discipline | Ocean physics -> Water temperature
Ocean physics -> Salinity
Ocean chemistry -> Salinity
Ocean chemistry -> Dissolved oxygen
Ocean environment -> Plant pigments
Ocean environment -> Seawater
Ocean environment -> Sediment
Ocean biology / Ocean ecology -> Biological classification
Ocean biology / Ocean ecology -> Biomass
Ocean biology / Ocean ecology -> Ecology
Ocean biology / Ocean ecology -> Arthropods
Ocean biology / Ocean ecology -> Mollusks
Ocean biology / Ocean ecology -> Others
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