A5014460951- Marine Toxins and Detection Methods
- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Environmental DNA in Biodiversity Studies
- Genomics and Phylogenetic Studies
- Protist diversity and phylogeny
- Marine Invertebrate Physiology and Ecology
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Geology and Paleoclimatology Research
- Marine and Coastal Ecosystems
- Oceanographic and Atmospheric Processes
- Earthquake and Disaster Impact Studies
- Marine and coastal plant biology
- Hemoglobin structure and function
- Agricultural Systems and Practices
- Earthquake and Tsunami Effects
- Arctic and Antarctic ice dynamics
- Cassava research and cyanide
- Radioactive contamination and transfer
- Neurotransmitter Receptor Influence on Behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Animal Ecology and Behavior Studies
Iwate Prefectural Kamaishi Hospital
2007-2022
Iwate Prefectural University
2016
Kitasato University
1970
This is the first report to explore fine‐scale diversity, population genetic structure, and biogeography of a typical planktonic microbe in Japanese Korean coastal waters also try detect impact natural human‐assisted dispersals on structure gene flow toxic dinoflagellate species. Here we present analysis Alexandrium tamarense (Lebour) Balech populations from 10 sites along coasts. We used nine microsatellite loci, which varied widely number alleles diversity across populations. The revealed...
The dinoflagellate Dinophysis spp. is responsible for diarrhetic shellfish poisoning (DSP). In the bivalves exposed to toxic bloom of dinoflagellate, dinophysistoxin 3 (DTX3), 7-OH acylated form either okadaic acid (OA) or DTX1, produced. We demonstrated in vitro acylation OA with palmitoyl CoA presence protein extract from digestive gland, but not other tissues bivalve Mizuhopecten yessoensis. yield 7-O-palmitoyl reached its maximum within 2 h, was highest at 37 °C followed by 28 °C, 16 and...
The identification and quantification of okadaic acid (OA)/dinophysistoxin (DTX) analogues pectenotoxins (PTXs) in Dinophysis samples collected from coastal locations around Japan were evaluated by liquid chromatography mass spectrometry. species identified analyzed included fortii, D. acuminata, mitra (Phalacroma mitra), norvegica, infundibulus, tripos, caudata, rotundata rotundatum), rudgei. dominant toxin found acuminata was PTX2 although some contained DTX1 as a minor toxin. specimens...
In 2003, an occurrence of the yessotoxin (YTX)-producing dinoflagellate, Protoceratium reticulatum, and resultant toxin concentration in scallops was monitored Okkirai Bay, northern Japan. The peaked after 1 July reached a maximum density (400 cells L−1) on 16 July. It occurred over wide range water temperature inorganic nutrient concentrations tolerant broad environmental conditions. Hydrological parameters were monitored, it obvious that P. reticulatum flourished under low salinity...
Abstract Oyster and scallop aquaculture has flourished in Ofunato Bay, on the Sanriku Coast of Japan. Between 1967 2011, this bay was a highly enclosed area by bay‐mouth breakwater, while breakwater provided calm conditions suitable for aquaculture, there concern about water quality deterioration. The Tohoku Earthquake off Pacific coast subsequent major tsunami 11 March 2011 caused extensive damage to Coast, resulting collapse Bay. We analyzed monthly hydrographic observational data that...
Abstract We assessed the feasibility of retrospectively reconstructing phytoplankton assemblages using next‐generation sequencing Psb A gene from cryopreserved DNA sampled Ofunato and Yamada bays during bloom season before (May–August 2010) after (June–July 2011) tsunami. The total number species detected was >280 when operational taxonomic unit ( OTU ) similarity threshold set at 0.95. During investigation, sequences Bacillariophyta, which are considered a suitable food for oysters,...
In this paper, we present a decay equation for paralytic shellfish poisoning (PSP) toxins using long-term field data spanning more than 10 years in order to predict the detoxification period scallop Patinopecten yessoensis Ofunato Bay, Japan. From data, obtained date of maximum toxicity digestive gland (DG) and then detoxification. Next, performed linear regression analysis between loge-toxicities days after level each study year. Toxicity declined at rate 1.5 %/day, 3–9 months was required...
Abstract Five years of datasets from 2015 to 2019 whole genome shotgun sequencing for cells trapped on 0.2-µm filters seawater collected monthly Ofunato Bay, an enclosed bay in Japan, were analysed, which included the data that we had reported previously. Nucleotide sequences determined extracted DNA three locations both upper (1 m) and deeper (8 or 10 depths. The biotic communities analysed at domain level comprised bacteria, eukaryotes, archaea viruses. relative abundance bacteria was over...
Growth response of five clonal cultures Alexandrium obtained from tropical and temperate waters were examined. Experiments carried out in eighteen variable temperature-salinity conditions (temperatures 15 °C, 20°C, 25°C; salinities between 5 to 30 psu) under constant illumination 150 ± 10.0 Amol m-2 s-' at 15:9 light:dark photo-cycle. Our results showed optimum growth all species 20 - 25°C. The salinity range for however varied among the species. rates A. eine, insuetum, fraterculus (0.28 —...