哺乳动物研究是日本哺乳动物学会的官方期刊。它发表关于哺乳动物学各个方面的原创文章、简短的交流和评论，以英文撰写。

Mammal Study is the official journal of the Mammalogical Society of Japan, focusing on various aspects of mammalogy. The journal publishes original research articles, short communications, and reviews, all written in English.

《Mammal Study》是日本哺乳动物学会的官方期刊，专注于哺乳动物学的各个领域。期刊发表原创研究文章、简短交流和评论，所有内容均以英文撰写。

Mammal Study

We investigated semen quality and seasonal changes in serum testosterone (T) concentrations in a male false killer whale, Pseudorca crassidens, under managed care. Semen was collected 107 times in 27 sessions for 22 months between June 2018 and April 2020 and analyzed for semen volume, sperm concentration, total motility, progressive motility, viability, and kinetic rating. Serum T concentrations in blood samples were measured by fluorescence immunoassay 1–4 times a month for routine health assessments from April 2016 to May 2022. The fourth and fifth ejaculates of each session were typically lower in volume but had higher values for all other tested parameters. The monthly mean serum T concentration showed a seasonal change; it began to increase in September, peaked between November and January (i.e., fall to spring), and declined until August (i.e., in late summer). This is the first report on semen quality in false killer whales, where we observed seasonal changes in T concentrations and established that the fourth and fifth ejaculates of a session yielded good-quality semen. Received 4 February 2022. Accepted 28 May 2024.

Suguru Higa

Mariko Omata

Misato Nakamura

Nozomi Kobayashi

Keiichi Ueda

Isao Kawazu

Long-Term Monitoring of Semen Quality and Serum Testosterone Concentration in a Male False Killer Whale in Managed Care

长期监测圈养雄性伪虎鲸精液质量和血清睾酮浓度

Rodents are the most abundant mammals on Earth, prevalent on all continents except Antarctica, and they fulfill important ecological roles in various ecosystems. Recent progress in high-throughput DNA-sequencing technology has enabled identification of diet components in various environmental samples, such as feces or stomach contents, through DNA metabarcoding. Studies using this method have begun to clarify the diets of small, nocturnal, and elusive rodents. This review summarizes previous studies that used DNA metabarcoding to clarify the diets of native or exotic species in Rodentia to understand progress and unresolved problems in such analyses. Furthermore, the methodology of dietary DNA metabarcoding in rodents is discussed, together with issues that should be taken into consideration. Finally, future perspectives and directions to be considered in the use of DNA metabarcoding in dietary studies of rodents are discussed. Received 30 March 2024. Accepted 22 August 2024

Jun J. Sato

Diets of Rodents Revealed through DNA Metabarcoding

通过DNA代谢条形码揭示啮齿动物的饮食

José Juan Flores-Martínez

Luz E. Correa

Daniel Pichardo

Víctor Sánchez-Cordero

Lázaro Guevara

An Insight into the Habitat and Population Fluctuation of Two Species of Shrews (Eulipotyphla, Soricidae) in a Forest-Agricultural Ecotone of the Trans-Mexican Volcanic Belt

墨西哥中部火山带森林-农业生态交错带两种鼩鼱（食虫目，鼩鼱科）的栖息地与种群波动研究

The pollination modes of plants vary among regions owing to faunal variations; however, knowledge of pollinators in tropical montane Asia is insufficient. Here, we elucidate the pollination system of Mucuna thailandica (Fabaceae), a plant endemic to the montane forest of Thailand. The genus Mucuna exhibits a distinctive pollination mechanism called "explosive opening″. The stamens and pistils of Mucuna flowers are covered by a pair of keel petals, and pollination is only possible when a flower is opened by a pollinator, which exposes stamens and pistil. In bagging experiments, unopened M. thailandica flowers did not bear fruit, indicating that an explosive opening was necessary for successful pollination. Automatic camera surveys showed that squirrels (Callosciurus finlaysonii/erythraeus complex and Dremomys rufigenis), masked palm civets (Paguma larvata), and northern treeshrews (Tupaia belangeri) opened the flowers explosively. Among them, the C. finlaysonii/erythraeus squirrels opened flowers most frequently, and three flowers bore fruits. Thus, C. finlaysonii/erythraeus squirrels may be effective pollinators of M. thailandica. Opening the flowers grants pollinators access to a large volume of nectar with a high sugar concentration as a reward. Our findings suggest that the role of nonflying mammals as pollinators in tropical Asian montane forests may be greater than previously thought.

Shun Kobayashi

Somsak Panha

Nattawadee Nantarat

Kriangkrai Chaiphichet

Penpitcha Choosa-nga

Teppei Higashi

Tetsuo Denda

Masako Izawa

Pollination System of Mucuna thailandica (Fabaceae), a Species Endemic to Thailand

泰国特有物种毛果豆（豆科）的传粉系统

To investigate diets of two sympatric carnivoran species, a leopard cat (Prionailurus bengalensis) and a yellow-throated marten (Martes flavigula), in Mt. Jeombongsan, Korea, we elucidated their diet compositions using fecal DNA. Their feces were collected from October 2015 to October 2018. After extracting DNA from fecal samples, the mitochondrial 12S rRNA gene of vertebrates and the rbcL regions from plants were amplified. Prey DNA was detected by cloning-based sequencing using blocking primers. A variety of rodents such as Muridae and Cricetidae and birds such as Passeriformes and Galliformes were frequently detected in feces of leopard cats and yellow-throated martens, suggesting that these taxa were important prey of the two carnivoran species. Regarding plant food sources, genus Prunus was frequently detected in feces of the leopard cat and genus Actinidia in feces of the yellow-throated marten, indicating that these two Carnivora species were not exclusively carnivorous. The maximum numbers of vertebrate prey taxa were estimated using rarefaction curves. Our results suggest that both species have roles as top predators in Mt. Jeombongsan, demonstrating significant differences in the diets of the two sympatric Carnivora species.

Jihee Kim

Sangkyu Park

Molecular Dietary Analysis of Two Sympatric Carnivoran Species, the Leopard Cat (Prionailurus bengalensis) and the Yellow-Throated Marten (Martes flavigula), in Mt. Jeombongsan, Korea

韩国济望山两种共域食肉目物种，豹猫（Prionailurus bengalensis）和黄喉貂（Martes flavigula）的分子饮食分析

Abbreviation	Mammal Study
Journal Impact	0.86
Quartiles(Global)	ZOOLOGY(Q3)

ISSN	1343-4152, 1348-6160
h-index	22

Publication Information	Publisher: Mammalogical Society of Japan，Publishing cycle: Semiannual，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 2008，Proportion of original research papers: 100.00%，Self Citation Rate:25.00%， Gold OA Rate: 0.00%
Average review cycle	网友分享经验：>12周，或约稿
Average recruitment ratio	网友分享经验：容易

Mammal Study

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Long-Term Monitoring of Semen Quality and Serum Testosterone Concentration in a Male False Killer Whale in Managed Care

Diets of Rodents Revealed through DNA Metabarcoding

An Insight into the Habitat and Population Fluctuation of Two Species of Shrews (Eulipotyphla, Soricidae) in a Forest-Agricultural Ecotone of the Trans-Mexican Volcanic Belt

Pollination System of Mucuna thailandica (Fabaceae), a Species Endemic to Thailand

Molecular Dietary Analysis of Two Sympatric Carnivoran Species, the Leopard Cat (Prionailurus bengalensis) and the Yellow-Throated Marten (Martes flavigula), in Mt. Jeombongsan, Korea

Long-Term Monitoring of Semen Quality and Serum Testosterone Concentration in a Male False Killer Whale in Managed Care

Diets of Rodents Revealed through DNA Metabarcoding

An Insight into the Habitat and Population Fluctuation of Two Species of Shrews (Eulipotyphla, Soricidae) in a Forest-Agricultural Ecotone of the Trans-Mexican Volcanic Belt

Pollination System of Mucuna thailandica (Fabaceae), a Species Endemic to Thailand

Molecular Dietary Analysis of Two Sympatric Carnivoran Species, the Leopard Cat (Prionailurus bengalensis) and the Yellow-Throated Marten (Martes flavigula), in Mt. Jeombongsan, Korea