A5002536029- Isotope Analysis in Ecology
- Wildlife Ecology and Conservation
- Marine animal studies overview
- Animal Ecology and Behavior Studies
- Geology and Paleoclimatology Research
- Meat and Animal Product Quality
- Pacific and Southeast Asian Studies
- Identification and Quantification in Food
- Fish Ecology and Management Studies
- Groundwater and Isotope Geochemistry
- Ecology and biodiversity studies
- Marine Bivalve and Aquaculture Studies
- Archaeology and ancient environmental studies
- Primate Behavior and Ecology
- Fermentation and Sensory Analysis
- Radioactive contamination and transfer
- Reproductive Physiology in Livestock
- Physiological and biochemical adaptations
- Reproductive System and Pregnancy
- Fungal Biology and Applications
- Environmental Toxicology and Ecotoxicology
- Hemispheric Asymmetry in Neuroscience
- Microplastics and Plastic Pollution
- Forensic Fingerprint Detection Methods
- Mercury impact and mitigation studies
Forestry and Forest Products Research Institute
2013-2024
Tokyo Metropolitan University
2008-2013
Tokyo University of Agriculture and Technology
2006
Oz virus (OZV) was isolated from an Amblyomma tick in Japan and shown to cause lethal viral myocarditis humans. However, the natural reservoirs distribution of OZV remain unknown. We describe epidemiologic studies conducted by using serum samples collected mammals throughout Japan. The results showed that 27.5% wild boars, 56.1% Sika deer, 19.6% Japanese macaques, 51.0% Asian black bears were positive for virus-neutralizing antibodies against OZV. Approximately 2.8% dogs 1.0% cats also...
Abstract It is important to unravel how invasive species impact native ecosystems in order control them effectively. The presence of abundant exotic prey promotes population growth predators, thereby enhancing the predation pressure on (hyper-predation). Not only but also feeding by humans likely cause “hyper-predation”. However, contribution artificial resources this was underestimated previous studies. Here, we combined fecal and stable isotope analyses reveal short- long-term food habits...
The purpose of this study was to ascertain whether or not Japanese black bears (Ursus thibetanus japonicus) are induced ovulators. progesterone levels female kept with a male and allowed mate (n=2) contact through bars but (n=6) during the mating season increased significantly in late October. Based on result, were considered have ovulated. Females isolated from males (n=3) ovarioectomized after season, no corpora lutea observed, indicating they had These findings suggest that may be...
Abstract We determined stable carbon isotopic compositions (δ13C) of plastics to discriminate between plant- and petroleum-derived plastics. The δ13C values derived from C4 plants are significantly higher than those These results suggest that the isotope analysis would be useful in discrimination plant-derived
We determined the differences in carbon, nitrogen and oxygen isotopic compositions (δ13C, δ15N, δ18O) between short grain rice samples from 9 locations (Hokkaido, Yamagata, Niigata, Nagano, Ibaraki, Tokyo, Mie, Hiroshima Okinawa) Japan to discriminate their geographical origin. Oxygen composition of brown is well correlation with that ambient water (R2 = 0.69). The δ18O values are correlated an increase latitude 0.82). δ13C upland higher than those paddy rice, depending on stress. These...
The diets of large, scarce mammals are difficult to study. We compared the food habits Asiatic black bears (Ursus thibetanus) in Tanzawa area, Japan, from before (1989–1993) and after (2001–2010) 2000 using both fecal contents carbon nitrogen stable isotope ratios bear hairs. Bears ate same foods 2000, but some categories differed their frequencies occurrence autumn. Fruits Prunus grayama, vine fruits, colonial insects, Sasa vegetation declined fruits Swida controversa sika deer (Cervus...
原木栽培及び菌床栽培の乾シイタケについて,炭素・窒素安定同位体比(δ13C,δ15N)を用いて,栽培方法及び産地判別の可能性を検証した.原木栽培乾シイタケは,国産は中国産よりもδ13Cは低く,δ15Nは高い傾向が得られ,韓国産は国産と中国産の中間的な値を示した.菌床栽培乾シイタケは,国産は中国産よりもδ13C,δ15Nが高い傾向を示した.ブラジル産については,原木栽培品・菌床栽培品ともにほかの地域よりもδ15Nが高い特徴が得られた.国産・中国産の乾シイタケについて,炭素・窒素安定同位体比分析を行い,産地判別の可能性を検証した結果,原木栽培の正答率は,国産87.4%,中国産87.9%,菌床栽培の判別率は,国産90.0%,中国産93.9% となった.以上より,原木栽培及び菌床栽培の乾シイタケのδ13C,δ15Nは,栽培方法及び産地によって特徴的な分布を示し,中国産と国産については産地判別の可能性が示唆された.
Abstract Anthropogenic foods such as agricultural crops have potential to give large impacts on wildlife populations. However, few studies addressed the impact of anthropogenic food consumption individual performance and then population long‐lived mammals herbivores. In this study, we investigated effect crop physical characteristics reproductive performances sika deer ( Cervus nippon ) in central Japan. To investigate relative dietary contribution for each individual, performed nitrogen...
コメの産地偽装問題が起きており，コメの産地を科学的根拠に基づいて判別する技術が必要とされている．本研究は，日本産，豪州産，米国産コシヒカリを用いて，炭素・窒素・酸素安定同位体比解析を行い，安定同位体比解析によるコメの産地判別の可能性を検証した．解析の結果，日本産のコメの安定同位体比は，平均値で，炭素では米国産よりも0.7‰，窒素では豪州産よりも3.8‰低く，酸素では豪州産と米国産よりもそれぞれ12.6‰，3.5‰低い値を示した．安定同位体比から，日本産のコメは，他国産のコメと識別できることが明らかになった．安定同位体比解析は，DNA判別や微量無機元素測定などの他の技術と相補的に利用すれば，強力な産地判別技術になる可能性がある．
Abstract We investigated maize ( Zea mays ) consumption by brown bears Ursus arctos in a subpopulation of eastern Hokkaido, Japan, using carbon stable isotope analysis hair samples to better understand the pattern and scale movement bears’ crop‐foraging behavior. identified total 30 individuals (19 males 11 females) DNA samples. Stable suggested that female were more likely consume lived closer agricultural crop fields. Our statistical model also estimated relative decreased rapidly as...
In the context of reducing human–bear conflict, understanding potential foraging variation within a bear population yields insights into differences in strategy according to an individual's sex and age. Stable isotope analyses reveal information regarding assimilated dietary components. To confirm Asian black bears assess its underlying factors, we conducted stable analysis hair samples. We constructed linear mixed-effect models examine effects sex, age, hard mast abundance on diet....
Abstract We determined stable carbon, nitrogen, and oxygen isotopic compositions (δ13C, δ15N, δ18O) of fibers to discriminate between plant, animal, synthetic fibers. The δ13C δ15N values are significantly lower than animal Cashmere alpaca have relatively δ18O other Moreover, there significant differences acrylic cashmere (e.g., in values). These results suggest that the isotope analysis would be useful discrimination natural
Carbon and oxygen stable isotope ratios of plants reflect their growing environment. In this study, we examined the carbon apple juice from Japan, China, Australia, South Africa, in order to confirm them as a potential index for verifying geographical origin juice. Apple Japan is characterized by lower {δ13C : −26.7 ± 1.0‰ (mean sd), δ18O 20.3 1.1‰} than those other countries. Especially, China has higher δ13C value (−24.6 0.5‰), Australia Africa have values (27.8 1.6‰ 29.4 2.3‰,...
本研究では,炭素・酸素安定同位体比分析を用いて,青森県産および中国産リンゴの産地判別の可能性を検討した.青森県産リンゴの炭素・酸素同位体比は,-26.9±1.2‰(平均値±標準偏差),19.2‰±1.4‰であるのに対し,中国産リンゴの炭素・酸素同位体比は,-25.2±1.3‰,25.4‰±2.1‰となり,炭素・酸素同位体比ともに青森県産が有意に低い値を示した(p<0.001).青森県産リンゴについて,酸素同位体比を比較すると,青森県内の地域間で有意差が見られた(p<0.001).とくに,青森市(21.5‰±0.7‰)は,酸素同位体比が高く,平賀町(17.8‰±0.6‰),西目屋村(17.7‰±0.4‰),大鰐町(17.6‰±0.4‰)では酸素同位体比が低い傾向が得られた.また,青森県産リンゴの炭素同位体比については,西目屋村は他の地域よりも有意に低い傾向が見られた.各地の降水量や水の酸素同位体比といった複数の生育環境が影響して,各国また各地域による特徴に傾向が得られたと考えられる.以上より,炭素・酸素安定同位体比分析によるリンゴの産地判別の可能性が示された.