論文 - 坂本 信介
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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）