A5037135291- Identification and Quantification in Food
- Genetic diversity and population structure
- Marine and fisheries research
- Ichthyology and Marine Biology
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Aquatic Invertebrate Ecology and Behavior
- Aquaculture Nutrition and Growth
- Crustacean biology and ecology
- Genomics and Phylogenetic Studies
- Fish Ecology and Management Studies
- Fish Biology and Ecology Studies
- Water Quality Monitoring and Analysis
- Fish biology, ecology, and behavior
- Food Industry and Aquatic Biology
- Coastal wetland ecosystem dynamics
- Medicinal Plants and Neuroprotection
- Coral and Marine Ecosystems Studies
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Marine and coastal plant biology
Japan Fisheries Research and Education Agency
2014-2025
Shimizu (Japan)
2014
The University of Tokyo
2014
Abstract The differing contributions of phytoplankton groups to biological pump have been insufficiently explored. We evaluated the sinking in mesopelagic layer using 16S rRNA gene amplicon sequencing. Sinking particles were collected from June August 2022 Sea Japan sediment traps moored at depths 387 and 890 m. Morphologically categorized fecal pellets—ellipsoidal, cylindrical, spherical, tabular types—were analyzed for their carbon content assemblages as well bulk non‐fecal particles....
Recent studies have revealed the impact of drastic climate change during last glacial period on coastal marine and anadromous species in marginal seas northwestern Pacific Ocean; however, its influence deep-sea remains poorly understood. To compare effects populations from Sea Japan Okhotsk, we examined mitochondrial control region cytochrome b gene sequences Lycodes matsubarai, a deepsea demersal fish that inhabits these two seas. Our results showed clear genetic differentiation between The...
In the Sea of Japan, field studies have found snow crab and red larvae occur between surface depths up to 550 m 1100 m, respectively. this region, hatch at 240–260 1000–1500 m. To understand their vertical distribution during larval period, we investigated upward swimming speed newly hatched (first-stage zoea) behaviour all stages (first second zoeal megalopal stages) in a temperature gradient under laboratory conditions. Our results showed that potential reach within few days hatching. As...
A total of 113 and 73 individuals the North Pacific lightfish Maurolicus japonicus were collected from Japan Sea Ocean off Japanese Islands, respectively. Based on nucleotide sequences mitochondrial genes for cytochrome oxidase c subunit I (COI) 16S ribosomal RNA, they classified into ‘Southern’ clade by Rees et al. (2017). Taken together, previous results our present findings suggest that examined should be treated as a single species, australis, this species exhibits highest genetic...
Genetic deviation between two deep-sea snailfishes, Careproctus pellucidus from the Pacific Ocean and rastrinus Okhotsk Sea, of species complex was analyzed, based on nucleotide sequences mitochondrial cytochrome b (Cytb) gene. Our sampling revealed occurrence individuals with C. rastrinus-type Cytb genes off northeastern Japan, in northwestern Pacific. Most these were collected an area Miyagi Prefecture, while few areas to its north (off Iwate Prefecture) south Fukushima Ibaraki...
Abstract To explore relationships between spatial distributions of northern shrimp Pandalus eous and environmental factors along the coastline Honshu Island in Sea Japan, we built delta-type two-step generalized additive models (delta-GAM) based on bottom trawl surveys conducted 2013–2022. The provide first quantitative analysis species’ habitat, showing that its distribution is associated with sediment type, depth, slope topographic position index (TPI) alongside effects year region. From...
Ricuzenius toyamensis Matsubara and Iwai, 1951 was originally described on the basis of eight specimens collected from Toyama Bay, Sea Japan coast central Honshu Island, Japan. The species has subsequently been considered as a valid genus Icelus Krøyer, 1845, diagnosed by following characters: supraocular parietal spines absent; nuchal spine blunt indistinct, covered with skin; uppermost preopercular unbranched; mid-sized scales scattered (not in rows) above below lateral line; belly naked;...
近海かつお一本釣りにより九州周辺で漁獲されるカツオの体長，肥満度および遺伝的特性を比較した。九州西方漁場では尾叉長50-60 cm FL付近主体で肥満度の高い群が大半を占め，40-70 FLの複数の体長群が出現するトカラ列島漁場とは異なった。mtDNA分析では異なる集団と判断されなかった。海洋条件も考慮すると，トカラ列島周辺に分布する魚群のうち，約50-60 FLで肥満度が高い個体のみが黒潮流路付近の水温フロントを超えて九州西方海域に北上する，サイズスクリーニング現象が起こっていると推察された。
Distinguishing between Beryx splendens and mollis (Actinopterygii: Beryciformes) on the basis of external morphology is difficult, a reliable method differentiation must be established. In this study, we developed multiplex polymerase chain reaction (PCR) with species-specific primers for distinguishing B. from mollis. total, 146 specimens were collected in North Pacific Ocean, East China Sea, Southwest Indian Ocean. Provisionally, 115 identified number pyloric caeca. Phylogenetic analysis...
A new species of the sand-burrowing dogielinotid amphipod genus Haustorioides Oldevig, 1958, furotai Ogawa, sp. nov., is described from Banzu tidal flat, east coast Tokyo Bay, Japan. The mainly characterized by a slender and triangular outer plate maxilliped, poorly setose antennae pereopods, straightly acute posterodistal corner epimeral plates 2 3, an uncleft ridged telson. Analyses mitochondrial cytochrome c oxidase subunit I sequences verified that H. belongs to monophyletic clade...
Many coastal barnacles are introduced to non-native regions. However, data lacking on cryptic invasion, which is defined as an invasion that remains unrecognised because the invader mistaken for a native or previously species clade. In this work, invasions of intertidal barnacle, Semibalanus cariosus, between Japan and north-eastern Pacific were evaluated based population genetic analyses. A significant differentiation was found Japanese populations, suggesting limited introduction genotypes...