Current survey on biological and nonbiological environment of coastal area in southern Iwate

Fiscal Year

2015

Title

Current survey on biological and nonbiological environment of coastal area in southern Iwate

Project and Theme

Project 1. Study on ecological succession of fisheries ground
Representative Organization: Tohoku University
Theme5. Studies on the coastal environment and marine resources in the southern part of Iwate Prefecture
Representative personRyusuke Kado
OrganizationKitasato University
DepartmentSchool of Marine Biosciences

Research Information

Period and Interval
2015/04/01 - 2016/03/31
Research Area
Okirai Bay, Ofunato Bay
Category
Field survey
Overview
We examined seasonal variations in water environment, and phyto- and zooplankton in Okirai Bay and Ofunato Bay to estimate the impact of the 2011 disaster and monitor its recovery process.

Overview of the Observation

Research Point Table
Polygon
NameOkirai Bay
Coordinates39.119858,141.812158/39.087621,141.806665/39.073496,141.821428/39.064167,141.877046/39.085223,141.880822/39.098812,141.873613/39.106006,141.857133
NameOfunato Bay
Coordinates39.073229,141.733833/39.0631,141.71495/39.025503,141.70465/39.008965,141.730561/39.02577,141.748414/39.034571,141.740861/39.059368,141.744294
Results and Future Plan
Water environment: After the 2011 disaster, the increase in bottom DO and the decrease in P/Si were observed in Ofunato Bay. In Okirai Bay, meanwhile, no large differences were found in pH, COD, DO, DO% saturation between the pre- and post-disaster periods, and no oil film was detected over the period of this study. Bottom sediments: In Okirai Bay, no differences were found in ignition loss, COD and total sulfide between the pre- and post-disaster periods. Zooplankton: During 2014-2015, the jellyfish Cladonema pacificum increased in Ofunato Bay, whereas the jellyfish Sarsia japonica was observed in Okirai Bay.

Investigation Item and Data Acquisition

Investigation ItemData Acquisition
Phyto- and zooplanktonPhyto- and zooplankton community composition
Water environmentWater temperature, salinity, DO, in vivo fluorescence of Chl-a, nutrients, pH, COD, DO, DO% saturation, oil film
Bottom sedimentsMud content, ignition loss, COD, total sulfide

Reference

Related Observation Plan
FY2015 Current survey on biological and nonbiological environment of coastal area in southern Iwate
Related Observation Data
CTD Okirai Bay 1504-1512

Person in charge of Investigation

Representative personRyusuke Kado
OrganizationKitasato University
DepartmentSchool of Marine Biosciences

Keywords

Fiscal Year2015
OrganizationKitasato University
CategoryField survey
Research AreaSouth Sanriku
DisciplineOcean physics -> Water temperature
Ocean physics -> Salinity
Ocean physics -> Transparency / Turbidity
Ocean chemistry -> Salinity
Ocean chemistry -> Dissolved oxygen
Ocean chemistry -> Nutrients
Ocean chemistry -> pH
Ocean environment -> pH
Ocean environment -> Chemical oxygen demand (COD)
Ocean environment -> Nutrients
Ocean environment -> Transparency
Ocean environment -> Seawater
Ocean biology / Ocean ecology -> Biological classification
Ocean biology / Ocean ecology -> Plankton
Topography / Geology / Geophysics -> Bottom sediment