A5072133661- Marine and fisheries research
- Fish Ecology and Management Studies
- Animal Behavior and Reproduction
- Plant and animal studies
- Insect and Arachnid Ecology and Behavior
- Isotope Analysis in Ecology
- Marine animal studies overview
- Animal and Plant Science Education
- Fish Biology and Ecology Studies
- Wildlife Ecology and Conservation
- Amphibian and Reptile Biology
- Marine Bivalve and Aquaculture Studies
- Cultural Differences and Values
- Food Industry and Aquatic Biology
- Botulinum Toxin and Related Neurological Disorders
- Forest Insect Ecology and Management
- Identification and Quantification in Food
- Animal Vocal Communication and Behavior
- Belt Conveyor Systems Engineering
- Neurobiology and Insect Physiology Research
- Plasma Diagnostics and Applications
- Species Distribution and Climate Change
- Marine and coastal ecosystems
- Environmental DNA in Biodiversity Studies
- Geology and Paleoclimatology Research
Japan Fisheries Research and Education Agency
2010-2024
Kyoto University
2013-2024
Tokyo University of Agriculture and Technology
2023-2024
University of California, Davis
2022-2023
Shimizu (Japan)
2015
General Department of Preventive Medicine
1963
Abstract There is considerable international concern and scientific debate about the current state future of tuna stocks worldwide capacity Regional Fisheries Management Organisations to manage associated fisheries effectively. In some cases, this has extended predictions imminent collapse with minimal chances recovery, even under a commercial catch moratorium. As viable alternative full fishery closure, Commission for Conservation Southern Bluefin Tuna ( CCSBT ) adopted scientifically...
Two stocks of bluefin tuna (Thunnus thynnus) inhabit the north Atlantic; western and eastern spawn in Gulf Mexico Mediterranean Sea respectively. Trans-Atlantic movements occur outside spawning time whereas natal homing maintains stock structure. Commercial fisheries may exploit a mixed assemblage both stocks. The incorporation mixing rates into assessment is precluded by uncertainties surrounding discrimination. Otolith shape descriptors were used to characterise Atlantic present study...
Abstract The developmental perspectives of animal personality enhance our understanding how structure changes in relation to life stage. Clonal animals are ideal models for studies because differences can be solely attributed environmental factors. Here, I investigated the presence within a species clonal gecko, Lepidodactylus lugubris , at different stages. For juveniles and adult geckos, measured exploration (reaction novel situation) boldness (risk-prone tendency) evaluated repeatability...
Abstract Trace elements and stable isotope ratios in otoliths have been used as proxies for the migration history of teleosts; however, their application oceanic fishes remains limited. This study reports first use radiocarbons to evaluate horizontal histories an fish species, walleye pollock Gadus chalcogrammus . We conducted radiocarbon analyses three stocks sourced from Hokkaido, Japan. The concentrations outermost portion Japanese Pacific, Northern Japan Sea (JS), Southern Okhotsk (OS)...
Abstract Recruitment of age‐0 Pacific bluefin tuna ( Thunnus orientalis ) from 1952 to 2014 was examined by a sequential regime shift detection method. The shifts in recruitment were detected 1957, 1972, 1980, 1994 and 2009. durations ranged 8–15 years averaged 13.0 years. In both the total (1952–2014) data rich (1980–2014) periods, negative relationships found between Decadal Oscillation autumn, positive sea surface temperature (SST) anomalies northern part East China Sea, southwestern Sea...
Lepidodactylus lugubris is one of the most widespread geckos distributed throughout tropical Asia and Pacific, some populations have been introduced to seasonal subtropical areas. On islands, L. reproduces year, it considered potentially be a continuous breeder. Generally reproduction in lizards greatly affected by climate, seasonality brings cyclic reproductive pattern. Therefore, invasive area likely climate there. In this paper, I report change size distribution northern Okinawajima...
Abstract The arrival of the warm tropical Leeuwin Current (LC) into southern Western Australia (SWA) may influence movement timing and foraging habitat juvenile bluefin tuna (SBT). Seasonal interannual changes in strength LC lead to thermal differences potential food availability between temperate waters SWA. This phenomenon could utilization SBT these summer grounds. Movement characteristics determined from tagged with acoustic transmitters ( N = 244) using cross‐shelf lines automated...
The inner ear of fish contains calcium carbonate (CaCO3)-based crystals called otoliths, which play an essential role in hearing and balance. During otolith formation, new is deposited layers on the surface existing part no longer affected by metabolism. This feature means that each layer retains trace element ratios isotope it had at time formation. By analysing this preserved information, possible to make estimates about environment habitat time. stepwise acid dissolution method has been...
Many species of organisms are known to have expanded their distributional ranges and established highly dense populations in nonnative areas due human activities. Several gecko been introduced from tropics seasonal subtropics with the aid artificial transportations. However, it has not yet well-documented as whether invasive tropical geckos flourish extra-tropical cooler outside native range. Here, I report demographic information mourning gecko, Lepidodactylus lugubris , its northernmost...
Plasma Sources Science and Technologyis pleased to announce a special issue focusing on the interaction of electromagnetic waves with low-temperature plasmas, be published in summer 2014.
1. Otoliths have been widely studied as natural recorders of the entire life cycle aquatic teleosts. Trace elements and stable isotope rations in otoliths are well understood used proxies migration histories, however few shown potential to reconstruct history oceanodromous fish. 2. This study reports first use radiocarbon otolith horizontal We analyzed three different stocks walleye pollock Gadus chalcogrammus around Hokkaido, Japan. 3. Radiocarbon concentration from outermost edge showed a...
口腔内常在性細菌であるFusobacteriumの親血性を中心にその生態学的な研究を行ない次のような結果を得た。1) 潜血反応試薬phenolphalinを使用して口腔内の微量の出血に起因する血液量の定量的測定法を考案した。2) 口腔内のFusobacterium菌数と口腔内の血液量との間には密接な関係が存在し, Fusobacteriumが親血層の細菌であることを確認した。3) Fusobacteriumの発育を促進する血液構成成分中の因子としてprotohemeを見出した。4) 高野の分類による各口腔別Fusobacteriumの分類の結果, 各口腔にその保有菌型に特徴が見出され, 特徴となる菌型の占める割合はかなり高率であつた。5) Penicillin耐性のFusobacteriumを人の口腔に接種, この菌の定住性を観察した結果, 血液濃度の高い口腔ならびに接種菌の型が口腔の保有菌型別特徴と一致した口腔により定住した。
The article Comparison of personality between juveniles and adults in clonal gecko species, written by Osamu Sakai was originally published electronically .