論文 - 坂本 信介
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Optimization of inhaled anesthesia for Octodon degus using electroencephalography 査読あり
Ikai Y., Nagura-Kato G.A., Sakamoto S.H., Shinohara A., Koshimoto C.
Experimental Animals 74 ( 1 ) 93 - 103 2025年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Experimental Animals
Physiological responses to inhaled anesthetics vary among species. Therefore, a precise anesthetic technique is important for each individual species. In this study, we focused on the degu (Octodon degus), a small herbivorous rodent. Degus have recently begun to be used as laboratory models for brain research because of certain human-like characteristics, such as spontaneous development of Alzheimer’s disease. In this study, we evaluated appropriate induction and maintenance anesthesia conditions for isoflurane and sevoflurane in degus by a stimulation test, electroencephalography (EEG), minimum alveolar concentration (MAC), and vital signs. During induction, more rapid time to loss of the righting reflex and deeper anesthesia in degus were observed in isoflurane. The MAC value for degus were 1.75 ± 0.0% in isoflurane and 2.25 ± 0.27% in sevoflurane. Whereas some degus were awake during maintenance anesthesia using both anesthetics at concentrations of ≤2%, no rats were awake when using sevoflurane at a concentration of 2%. The duration of the total flat EEG, a measure of the depth of maintenance anesthesia, was longer for isoflurane than for sevoflurane. Furthermore, higher concentrations of both anesthetics suppressed the respiratory rate in degus. These new findings regarding inhalation anesthesia in degus will contribute to future developments in the fields of laboratory animals and veterinary medicine.
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Ishiniwa H., Okano T., Endoh D., Hirayama H., Yoshioka A., Yokohata Y., Shindo J., Koshimoto C., Shinohara A., Sakamoto S.H., Tamaoki M., Onuma M.
Scientific Reports 14 ( 1 ) 29706 2024年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Scientific Reports
The Fukushima Daiichi Nuclear Power Plant accident caused the release of large amounts of radioactive material into the environment. Radiation from radionuclides cause DNA lesions, mainly via oxidation, which adversely affect wild organisms by damaging their germ cells. Here, we investigated the effects of radiation on the reproductive organs of Japanese field mice (Apodemus speciosus) by estimating the dose rate of radiation exposure, the accumulation of DNA lesions, and the expression of DNA repair enzymes. In highly contaminated areas, mouse testes received a radiation dose rate > 0.1 mGy/d. According to the International Commission on Radiological Protection, there is a very low probability of effects in the reference rat species at this exposure level. The results of the current study do not definitively conclude that the expression of 8-oxoguanine DNA glycosylase 1 and superoxide dismutase in mouse testes increase with dose rate and lifetime dose. However, 8-hydroxy-2′-deoxyguanosine accumulation increases in a dose rate- and lifetime dose-dependent manner in mouse testes, but is not observed in the sperm of the cauda epididymis. These results suggest that, although DNA lesions occurred in male germ cells of Fukushima mice, most were successfully repaired by DNA repair enzymes at the observed gene expression level.
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Kodama T., Sakamoto S.H., Mori A.
Proceedings of the Royal Society B: Biological Sciences 291 ( 2027 ) 20240719 2024年7月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of the Royal Society B: Biological Sciences
Understanding how environmental factors affect the performance of predators can provide profound insights into predator-prey interactions from evolutionary and ecological perspectives and the global distributional patterns of each taxon. Almost all venomous predators are ectotherms, with muscle contraction properties depending on temperature. For predators having venom transportation systems driven by muscle contraction, temperature may have quite large effects on envenomation performance for prey subjugation. Here, we used videography and enzyme-linked immunosorbent assay to examine thermal effects on envenomation kinematics and venom expenditure in predatory strikes of a venomous snake, the Mamushi Gloydius blomhoffii, to its main rodent prey at various body temperatures under both field and laboratory experimental conditions. Unexpectedly, we found that the thermal effects on envenomation performance are limited over nearly the entire ecologically relevant range of temperature (from 13.2°C to 26.2°C). Although temperature statistically significantly affected the mass of venom injected under field conditions, temperature explained only a minor proportion of the variation in venom expenditure. These findings suggest that the Mamushi is able to maintain prey subjugation performance across a wide range of temperatures, which is highly advantageous for ectothermic predators. Further studies should examine the underlying mechanisms of the limited thermal effects and their ubiquity across venomous predators.
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Tone M., Ukyo R., Sakamoto S.H., Hemmi K., Kobayashi I., Tsuzuki Y.
Cryo-Letters 44 ( 5 ) 307 - 313 2023年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Cryo-Letters
BACKGROUND: Cryopreservation of porcine oocytes is difficult compared with other species and immature oocytes particularly so compared to the meiotic stage. OBJECTIVE: To evaluate the efficacy of a pretreatment with 1 μM paclitaxel (PTX, 30 min exposure) before vitrification to promote the maturation of porcine immature oocytes. MATERIALS AND METHODS: Cumulus cell-enclosed oocytes (COs) aspirated from porcine ovaries were divided into three groups: i) non-pretreated with PTX and non-vitrified group (control group); ii) pretreated with PTX and vitrified group (PTX-V group); and iii) non-pretreated with PTX and vitrified group (nPTX-V group). RESULTS: The nuclear maturation rate up to the preovulatory stage was significantly lower (P<0.05) in the nPTX-V group than in the control group, but was similar in the PTX-V and control groups. No significant differences were observed in viability assessed by a normal CO morphology and the embryonic development of oocytes activated by the parthenogenetic stimulation between the PTX-V and control groups, but not the non-PTX-V group. CONCLUSION: PTX may promote the maturation of vitrified porcine immature oocytes.
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Long-term behavioral effects of social separation during early life in a social mammal, Octodon degus. 査読あり
Ukyo R, Shinohara A, Koshimoto C, Nagura-Kato GA, Ieiri S, Tsuzuki Y, Sakamoto SH
Scientific reports 13 ( 1 ) 9518 2023年6月
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Identifying-and-counting based monitoring scheme for pigs by integrating BLE tags and WBLCX antennas 査読あり
Geunho Lee, Koki Ogata, Kikuhito Kawasue, Shinsuke Sakamoto, Seiji Ieiri
Computers and Electronics in Agriculture 198 2022年7月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Effects of aging and delivery order on the breeding capacity of F344/N rats. 査読あり
Sakamoto SH, Nishijima K, Ohno T, Tanaka S
The Journal of Veterinary Medical Science 84 ( 7 ) 960 - 963 2022年5月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
DOI： 10.1292/jvms.22-0111
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An attempt to clarify the causes of osteophagia among sika deer on Mageshima Island. 査読あり
Shichijo H, Tatsuzawa S, Sakamoto SH, Morita T
日本暖地畜産学会報 65 ( 2 ) 2022年3月
担当区分：責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Sakamoto SH, Miyamoto Y, Ukyo R, Ieiri S
The Journal of veterinary medical science 84 ( 5 ) 653 - 659 2022年3月
担当区分：筆頭著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Veterinary Medical Science
To strengthen farm biosecurity, wildlife behaviors around livestock environments require significant attention. Livestock feed is considered one of essential factors that attract wildlife to the livestock environment. We experimentally studied wildlife response to cattle, swine, and chicken concentrated feeds in the forests surrounding poultry farms. In 14 feeding sites, four feed conditions were established: without feed (control); cattle feed; chicken feed; and swine feed. Wildlife behaviors at each feed point were monitored using infrared cameras. In 3,175 videos, 10 mammals were photographed on 10 or more occasions. Wildlife more frequently appeared at the points with feed than without feed. In addition, the number of videos that captured foraging or interest behaviors was largest for swine feed, followed by chicken feed, then cattle feed. There was a large difference among wildlife in their response to livestock feeds, although each species did not have a strong preference for a specific feed. Livestock feeds invite frequent visits by high and moderate response groups, especially omnivores and carnivores with omnivorous tendencies. Therefore, to protect against such wildlife intrusion, leftover feed and feed storage must be properly managed. This study also suggests that livestock feeds may not cause intrusions by rare response group species; hence, if their intrusions occur, they may be due to factors other than livestock feed. The study situation can partly reflect actual feed-stealing situations. The results will contribute to consider the properly management to protect livestock environments from wildlife intrusions.
DOI： 10.1292/jvms.21-0627
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Body temperature measurement reveals the reproductive profile of female Apodemus speciosus under laboratory and field conditions. 査読あり
Kuroyanagi A, Ukyo R, Kodama Y, Eto T, Okubo Y, Kobayashi I, Ieiri S, Morita T, Sakamoto SH
Mammal study 47 ( 3 ) 2022年3月
担当区分：最終著者, 責任著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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Antibiotic-resistant Escherichia coli isolated from dairy cows and their surrounding environment on a livestock farm practicing prudent antimicrobial use. 査読あり
Suzuki Y, Hiroki H, Xie H, Nishiyama M, Sakamoto SH, Uemura R, Nukazawa K, Ogura Y, Watanabe T, Kobayashi I
International journal of hygiene and environmental health 240 113930 2022年3月
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トクノシマトゲネズミ（<i>Tokudaia tokunoshimensis</i>）の生息記録と2005年～2016年の分布
城ヶ原 貴通, 中家 雅隆, 池村 茂, 越本 知大, 坂本 信介, 橋本 琢磨, 三谷 匡, 黒岩 麻里, 山田 文雄
哺乳類科学 60 ( 1 ) 105 - 116 2020年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本哺乳類学会
トゲネズミ属（<i>Tokudaia</i>）は琉球列島にのみ分布する固有属であり，トクノシマトゲネズミ（<i>Tokudaia tokunoshimensis</i>）は徳之島にのみ分布する固有種で，絶滅が危惧されている．本種の分布・生息状況についてはまとまった記録が蓄積されておらず，保全策を検討する上で分布・生息状況を明らかにする必要がある．本研究ではトクノシマトゲネズミの保全に向けた第一段階として本種の分布状況を明らかにするため，2011年から2015年の捕獲調査，自動撮影カメラによる調査に加え，2005年から2016年の目撃記録・直接観察の情報の整理ならびにその他の分布情報を精査した．その結果，トクノシマトゲネズミの分布は島北部の天城岳ならびに島中東部に位置する井之川岳周辺を分布の中心地域とし，南部の犬田布岳周辺にわずかに生息していることが明らかとなった．また，比較的良好な森林があるにも関わらず生息が確認できない地域が存在することが明らかとなった．本調査結果は，絶滅のおそれのあるトクノシマトゲネズミの保全地域の設定およびイエネコ（<i>Felis catus</i>）による捕食対策など生息地保全を含むさまざまな保全策の策定に基礎情報を提供するものである．
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ヨーロッパモリネズミにおける尿を用いたストレスホルモンの測定 査読あり
前山健太、篠原明男、仮屋博敬、川辺敏晃、城ヶ原貴通、名倉悟郎、坂本信介、越本知大
九州実験動物雑誌 35 29 - 38 2019年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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牧場施設内外および季節間での野生哺乳類の出現頻度の差異 査読あり
坂本 信介，畔柳 聴，右京 里那，小林 郁雄，家入 誠二
日本暖地畜産学会報 62 ( 2 ) 99 - 105 2019年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本暖地畜産学会
牧場への野生動物の侵入をカメラトラップ法で調べる際に，カメラの設置位置や設置時期によって結果が大きく変わるかを調べるため，同一牧場内の様々な施設の内外に 1 年にわたり自動撮影カメラを 9 台設置し，飼養形態や利用方式が異なる施設ごとにまた季節ごとに野生哺乳類の出現状況を比較した．哺乳類の撮影頻度は施設間で大きく異なっており，相対的に乳牛舎内，肥育牛舎外，繁殖牛舎外では，食肉類の撮影頻度が高い傾向にあった．また，肥育牛舎，繁殖牛舎，倉庫では，動物の撮影頻度のうちわけが施設の内外で大きく異なっていた．イエネズミとノネズミのどちらもが施設外で撮影されたため，イエネズミの施設内外の移動と施設外での両者の直接的・間接的接触が懸念された．また各動物の出現頻度には季節性が見られた．以上の結果から，牧場内でカメラトラップ法を用いる際には，撮影地点や設置時期の選定が調査結果に影響を及ぼすと考えられる．
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Wireless IC tag based monitoring system for individual pigs in pig farm 査読あり
Geunho Lee, Myungsik Kim, Kazuki Koroki, Atsushi Ishimoto, Shinsuke H. Sakamoto, and Seiji Ieiri
IEEE 1st Global Conference on Life Sciences and Technologies 168 - 170 2019年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Monitoring system based on active RFID tags for acquiring ecological data of individual pigs 査読あり
Geunho Lee, Kazuki Koroki, Takashi Yoshiura, Atsushi Ishimoto, Shinsuke Sakamoto, and Seiji Ieiri
Proc. 24th International Symposium on Artificial Life and Robotics 901 - 904 2019年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Behavioural interference among eusocial naked mole rats during work 査読あり
Kutsukake N., Inada M., Sakamoto S., Okanoya K.
Journal of Ethology 37 ( 1 ) 101 - 109 2019年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Ethology
It has been reported that individuals of cooperative breeding species occasionally interfere with the work of other group members. However, the occurrence and function of this behaviour are controversial. In the naked mole rat (Heterocephalus glaber), a eusocial mammal, individuals frequently perform ‘tail-tugging’ behaviour, in which an actor holds the tail of another individual with the mouth and pulls that individual to a different place. In this study, we investigated the possible function of this behaviour in the experimental setting of soil excavation. Behavioural observations on three colonies showed that this behaviour was performed and received by individuals of all individual categories (i.e. queen, reproductive males, and workers), although a queen in one colony performed 72.5% of the observed behaviour. Our data support the hypothesis that this behaviour is used to monopolise work in a specific space because (1) tail-tugging was more likely to occur when the actor and recipient were working than when they were not, and (2) the actor performed tail-tugging in a cell in which that individual worked frequently. This study provides a rare example of behavioural interference in a cooperative society and suggests that there is disagreement and conflict regards the opportunity to work among colony members in this eusocial mammal.
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牧場における畜産動物と畜舎周辺に生息する野生小動物の薬剤耐性大腸菌の実態調査 査読あり
廣木颯, 畔柳聴, 坂本信介, 小林郁雄, 上村涼子, 糠澤桂, 鈴木祥広
土木学会論文集G（環境） 74 ( 7 ) III_231 - III_238 2018年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：公益社団法人 土木学会
畜産動物は抗菌薬を投与される場合があり，薬剤耐性菌の発生源となり得る．また，ネズミなどの小動物が，畜産動物の残餌やふんなどを摂餌する様子も観察されている．したがって，畜産動物から小動物へと薬剤耐性菌が伝播され，自然環境へ拡散する可能性は否定できない．本研究では，住吉牧場で飼育される肉用牛と畜舎周辺の野生ネズミを対象に，11種類の抗菌薬に対する薬剤感受性試験を実施した．ウシとネズミで，1剤以上に耐性を示した大腸菌が検出された個体の割合は，それぞれ50.0%と41.2％であった．また，両方のふん便からアンピシリンとテトラサイクリンに耐性を示した大腸菌が検出された．薬剤耐性を保有する畜舎内のウシと畜舎周辺におけるネズミの分布状況から，ネズミが薬剤耐性大腸菌を媒介し，環境に拡散している可能性が示唆された．
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Takeshi Eto, Shinsuke H. Sakamoto, Yoshinobu Okubo, Yasuhiro Tsuzuki, Chihiro Koshimoto, and Tetsuo Morita.
Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology 188 ( 6 ) 1005 - 1014 2018年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
© 2018, Springer-Verlag GmbH Germany, part of Springer Nature. Daily torpor is a strategy used by some overwintering small endotherms to aid in energy conservation. However, the pattern of torpor varies among individuals within species and populations, even under the same environmental conditions, with significant implications for survival rate and reproductive success. Body mass is one factor that may influence this variation, especially in some small mammals that accumulate fat stores prior to overwintering. However, to our knowledge there has been no previous study examining the detailed relationships between torpor expression and body mass change in small mammals that hoard food as an energy resource during winter. The large Japanese field mouse, Apodemus speciosus, whose winter survival strategy depends on food caches instead of fat stores, displays daily torpor under artificial winter conditions (short-day photoperiod and cold). The present study clarifies the characteristics and patterns of daily torpor and body mass change in this species in the laboratory. Although expression of daily torpor was facilitated progressively as in other species, the observed patterns of torpor expression and body mass change showed considerable individual variation. Moreover, there was no obvious correlation between body mass and daily torpor expression. Therefore, it is suggested that in A. speciosus body mass may not contribute to individual variation of daily torpor during winter. Daily torpor during winter may be adjusted by not only mechanisms common to other small mammals, but also species-specific factors relating to the external or internal reserves of energy in small mammals.
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Individual differences in torpor expression in adult mice are related to relative birth mass 査読あり
Goro A. Kato, Shinsuke H. Sakamoto, Takeshi Eto, Yoshinobu Okubo, Akio Shinohara, Tetsuo Morita, and Chihiro Koshimoto
Journal of Experimental Biology 221 ( 12 ) jeb171983 2018年7月
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カンショ由来生焼酎粕給与が肥育豚の飼養成績と肉質に及ぼす影響 査読あり
勝俣 沙智, 鎌倉 美彩子, 磯島 聖良, 高橋 俊浩, 小林 郁雄, 河原 聡, 坂本 信介, 新美 光弘, 川島 知之
日本畜産学会報 89 ( 2 ) 199 - 206 2018年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Kawagoshi, T., Shiomi, N., Takahashi, H., Watanabe, Y., Fuma, S., Doi, K., Kawaguchi, I., Aoki, M., Kubota, M., Furuhata, Y., Shigemura, Y., Mizoguchi, M., Yamada, F., Tomozawa, M., Sakamoto, S.H., Yoshida, S., Kubota, Y.
Environmental Science and Technology 51 ( 8 ) 4632 - 4641 2017年4月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Environmental Science and Technology
Since the Fukushima Dai-ichi Nuclear Power Plant accident, radiation effects on nonhuman biota in the contaminated areas have been a major concern. Here, we analyzed the frequencies of chromosomal aberrations (translocations and dicentrics) in the splenic lymphocytes of large Japanese field mice (Apodemus speciosus) inhabiting Fukushima Prefecture. A. speciosus chromosomes 1, 2, and 5 were flow-sorted in order to develop A. speciosus chromosome-specific painting probes, and FISH (fluorescence in situ hybridization) was performed using these painting probes to detect the translocations and dicentrics. The average frequency of the translocations and dicentrics per cell in the heavily contaminated area was significantly higher than the frequencies in the case of the noncontaminated control area and the slightly and moderately contaminated areas, and this aberration frequency in individual mice tended to roughly increase with the estimated dose rates and accumulated doses. In all four sampling areas, the proportion of aberrations occurring in chromosome 2 was approximately > 3 times higher than that in chromosomes 1 and 5, which suggests that A. speciosus chromosome 2 harbors a fragile site that is highly sensitive to chromosome breaks induced by cellular stress such as DNA replication. The elevated frequency of chromosomal aberrations in A. speciosus potentially resulting from the presence of a fragile site in chromosome 2 might make it challenging to observe the mild effect of chronic low-dose-rate irradiation on the induction of chromosomal aberrations in A. speciosus inhabiting the contaminated areas of Fukushima.
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Eto T., Ozaki R., Kato G., Sakamoto S., Koshimoto C., Morita T.
Mammal Study 41 ( 2 ) 71 - 76 2016年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Mammal Study
© The Mammal Society of Japan. In some small mammals, digestive tract morphology is known to vary between and within individuals over time. Although changes in organs such as the stomach, small intestine, cecum, and large intestine vary among species, there is a trend toward increasing length and mass in individuals faced with increasing energy demands due to cold exposure or to reduced food quality. These morphological changes can also be induced by short day photoperiod, and could therefore serve as a winter adaptation. However, the extent to which these morphological responses to environmental cues are shared among mammals is not known. We examined the influence of cold temperature and short day photoperiod on the digestive tract morphology of Apodemus speciosus. The length and dry mass of all organs increased in response to cold temperature, and the dry mass of the small intestine was also increased by short day photoperiod. The small intestine is the principal site of nutrient absorption, and changes in its morphology may be an important aspect of winter adaptation. These results suggest that digestive tract morphology may alter flexibly as a means of coping with energy challenges.
DOI： 10.3106/041.041.0204
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The effect of food shortage, daylength and low temperature on thermoregulation in two gerbil species 査読あり
Daisuke Watanabe, Mihoko Hatase, Shinsuke H. Sakamoto, Chihiro Koshimoto, Akio Shinohara, Tetsuo Morita
Japanese Journal of Environmental Entomology and Zoology 27 ( 1 ) 9 - 16 2016年5月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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ミゾゴイGorsachius goisagi (Temminck, 1835)飼育個体における血液生化学性状の季節変化 査読あり
渡部大介，古根村幸恵，増田洋志，越野慶太，髙橋健太，竹田正人，出口智久，坂本信介，森田哲夫
環動昆 26 ( 4 ) 143 - 150 2016年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Shinohara A., Uchida E., Shichijo H., Sakamoto S., Morita T., Koshimoto C.
Mammalian Biology 81 ( 1 ) 46 - 52 2016年1月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Mammalian Biology
© 2014. The mammalian gastrointestinal tract has evolved to facilitate food utilisation. Hamsters within the subfamily Cricetinae (Rodentia, Cricetidae) have a compartmentalised stomach consisting of a forestomach and a glandular stomach. The role of the forestomach in hamsters has long been discussed. In this study, we evaluated the microflora and volatile fatty acid contents of the large forestomach and caecum of a greater long-tailed hamster (Tscherskia triton). The estimated bacterial biodiversity in the forestomach based on 16S rRNA library sequencing analyses was low (sequence n=226, Shannon index H'=2.12) compared to that in the rumen of ruminants. In contrast, the bacterial diversity in the caecum was very high (n=259, H'=4.45), and comparable to that of other hindgut fermenters. The forestomach bacterial flora was dominated by Lactobacillus spp. (179/226 clones), and high concentrations of lactic acid were observed in the forestomach. These results indicate that the forestomach does not function like the rumen of ruminants, but that lactic acid fermentation does take place in this compartment. The caecum is thought to play a more important role in food digestion via fermentation by symbiotic microbes than the forestomach. When all cloned 16S rRNA gene sequences n(=485) were grouped into operational taxonomic units (OTUs) with 97% similarity, the majority of clones isolated from the forestomach contents were also present in the caecum (85.4%), although fewer clones isolated from the caecum contents shared OTUs with clones from the forestomach (19.3%). Based on these results, we hypothesise that bacteria were transferred from the caecum to the forestomach by coprophagy.
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Molecular phylogenetic relationships and intra-species diversities of three Euroscaptor spp. (Talpidae: Lipotyphla: Mammalia) from Vietnam. 査読あり
Shinohara A, Kawada S, Nguyen Truong Son · Dang Ngoc Can, Sakamoto SH, Koshimoto C
The Raffles Bulletin of Zoology 63 366 - 375 2015年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Chromosomal aberrations in wild mice captured in areas differentially contaminated by the Fukushima dai-Ichi nuclear power plant accident 査読あり
Kubota Y, …, Sakamoto SH, and Yoshida S
Environmental science & technology 49 ( 16 ) 10074 - 10083 2015年8月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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The effects of maternal presence on natal dispersal are seasonally flexible in an asocial rodent 査読あり
Sakamoto SH, Eto T, Okubo Y, Shinohara A, Morita T, Koshimoto C.
Behavioral Ecology and Sociobiology 69 ( 7 ) 1075 - 1084 2015年7月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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防風林の下層植生管理が森林棲小型哺乳類の農地利用に与える影響 査読あり
坂本信介
日本暖地畜産学会報 58 ( 1 ) 37 - 43 2015年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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採餌効率の制御と防風林の枝打ちが鳥類の農作物残渣利用に与える影響 査読あり
坂本信介
日本暖地畜産学会報 58 ( 1 ) 87 - 94 2015年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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滑空性リス類の繊維質消化：ムササビとニホンモモンガの比較 査読あり
大久保慶信, 七條宏樹, 渡部大介, 甲斐のぞみ, 出口智久, 坂本信介, 森田哲夫
日本環境動物昆虫学会誌 26 29 - 35 2015年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Trap distance affects the efficiency and robustness in monitoring the abundance and composition of forest-floor rodents 査読あり
Sakamoto SH, Suzuki SN, Koshimoto C, Okubo Y, Eto T & Suzuki RO
Journal of Forest Research 20 ( 2 ) 151 - 159 2015年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Magnitude of food overabundance affects expression of daily torpor 査読あり
Etoh T, Hayashi R, Okubo Y, Kashimura A, Koshimoto C, Sakamoto SH, Morita T
Physiology & Behavior 139 519 - 523 2015年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Wakizoe E, Ashizawa K, Sakamoto SH, Henmi K, Kobayashi I, Tsuzuki Y
Zygote 23 ( 6 ) 885 - 892 2014年12月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Huddling facilitates expression of daily torpor in the large Japanese field mouse Apodemus speciosus. 査読あり
Eto T**, Sakamoto SH**, Oka A, Hayashi R, Kashimura A, Okubo Y, Koshimoto C, Morita T
Physiology & Behavior 133 22 - 29 2014年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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チベット高原三江源地域高山放牧地におけるクチグロナキウサギ（Ochotona curzoniae）の生息密度と植生との関係 査読あり
楊家華, 井戸田幸子, 李国梅, 宋仁徳, 郭志宏, 李暁琴, 李海珠, 飛佐学, 多炭雅博, 福田明, 西脇亜也, 樫村敦, 坂本信介, 森田哲夫, 長谷川信美
日本暖地畜産学会報 57 ( 1 ) 37 - 47 2014年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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環境温度と日長がニホンモモンガの体温、体重および採食量に及ぼす影響 査読あり
大久保慶信, 坂本信介, 樫村敦, 森田哲夫
日本環境動物昆虫学会誌 25 ( 1 ) 1 - 9 2014年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高コレステロール血症を自然発症するヨーロッパモリネズミに対するプラバスタチンの影響 査読あり
名倉彩香, 篠原明男, 坂本信介, 越本知大
九州実験動物雑誌 29 23 - 28 2013年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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盲腸切除がトリトンハムスターの食糞行動に及ぼす影響 査読あり
七條宏樹, 近藤祐志, 坂本信介, 樫村敦, 高橋俊浩, 森田哲夫
日本環境動物昆虫学会誌 24 ( 2 ) 51 - 57 2013年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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絶滅危惧種アマミトゲネズミTokudaia osimensisの実験室環境における長期飼育 査読あり
篠原明男, 山田文雄, 樫村敦, 阿部槇太郎, 坂本信介, 森田哲夫, 越本知大
哺乳類科学 53 ( 2 ) 335 - 344 2013年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Populations of follicles in F344/N rats during aging 査読あり
Nishijima K, Kuwahara S, Ohno T, Tanaka S, Sakamoto SH, Kitajima, S
Reproductive Biology 13 ( 2 ) 145 - 149 2013年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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アカネズミ（Apodemus speciosus）の自然交配による繁殖を誘導できる飼育交配手法 査読あり
酒井悠輔, 坂本信介, 岩元直治郎, 尾崎良介, 江藤毅, 篠原明男, 森田哲夫, 越本知大
哺乳類科学 53 ( 1 ) 57 - 65 2013年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Nutritional significance of coprophagy in the rat-like hamster Tscherskia triton 査読あり
Shichijo H, Takahashi T, Kondo Y, Sakamoto SH & Morita T
Mammalia 77 ( 3 ) 329 - 333 2013年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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微生物叢の 16S rRNA遺伝子からトリトンハムスターの大きな前胃の役割を推測する
篠原 明男, 内田 栄太, 井上 比加里, 七條 宏樹, 坂本 信介, 森田 哲夫, 越本 知大
霊長類研究 Supplement 29 ( 0 ) 2013年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本霊長類学会
哺乳類はセルロースなどの繊維質を加水分解する消化酵素を産生できず，それらを栄養源として利用する草食性哺乳類は，繊維質分解に寄与する微生物を消化管内に共生させている．ウシなどの前胃発酵動物は主に前胃に，ウマ・ウサギなどの後腸発酵動物は主に盲腸に微生物を共生させ，それぞれの消化管を大型化し発達させた．一方で小型齧歯類にも草食傾向の強い種が存在する．その中には前胃と盲腸の両方を発達させ，形態学的には前胃発酵動物と後腸発酵動物の両方の特徴をあわせ持つものもいる．これらの消化管のうち，盲腸は繊維質分解に寄与しているのではないかという報告が散見されるものの，前胃の役割は殆ど明らかになっていない．そこで本研究では，大きな前胃と発達した盲腸をもつトリトンハムスター（ Tscherskia triton）の前胃と盲腸内の微生物叢を 16S rRNA遺伝子配列を用いて同定することで，前胃と盲腸の栄養学的な意義を検討した．<br> 前胃および盲腸内容物から抽出した DNAから，16S rRNA遺伝子（約1400bp）を PCR法によって網羅的に増幅し，サブクローニングを経て塩基配列を決定した．前胃から 234クローン，盲腸から268クローンの配列を解析したところ，前胃では Lactobacillus属（乳酸菌）が優占的に検出され，その多様性は大型反芻獣の前胃内微生物叢と比較して極めて低かったのに対して，盲腸内からは多様な微生物種が検出され，草食性の後腸発酵動物であるウサギの盲腸内微生物叢に匹敵する高い多様性が検出された．これらの結果から，トリトンハムスターの盲腸は繊維質分解に寄与していると考えられたが，前胃は大型の前胃発酵動物とは異なる役割を担っていると推測された．同定された微生物叢から推測する限り，前胃内では乳酸発酵が行われており，前胃は盲腸の補助的な発酵槽として機能している可能性も考えられた．
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Sakamoto Shinsuke H., Suzuki Satoshi N., Degawa Yousuke, KOSHIMOTO Chihiro, SUZUKI Ryo O.
Mammal study 37 ( 4 ) 261 - 272 2012年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Mammal Society of Japan
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Kutsukake N, Inada M, Sakamoto SH, Okanoya K
PLoS One 7 ( 9 ) e44584 2012年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）