研究者詳細 - 梶村　恒

論文 - 梶村　恒

分割表示 108 件中 1 - 20 件目／全件表示 >>

Foraging strategy of wood mice for undamaged and moth-infested Castanea crenata nuts on forest floor 査読有り国際誌 Open Access

Kajita, R; Kajimura, H

SCIENTIFIC REPORTS 15 巻 ( 1 ) 頁： 43508 2025年12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）出版者・発行元：Scientific Reports

This study investigated the foraging strategy of wood mice for undamaged Castanea crenata nuts and those with exit holes from moth larvae (EH nuts) on the forest floor in 2022 and 2024. Mice were captured using live traps, and nut infestation status was assessed. A behavior experiment was also conducted to observe the mouse responses to nuts. In both years, Apodemus speciosus and A. argenteus were observed. Throughout the entire study period, EH nuts accounted for a large proportion of insect-damaged nuts. Most EH nuts (95/100) showed reduced contents (i.e., mostly cotyledons) (0–40%) and internal discoloration. Nonetheless, almost all nuts were removed overnight, with undamaged nuts removed earlier than EH nuts. Mice sniffed or clutched approximately 50% of the nuts before removal, suggesting olfactory-based evaluation. A higher proportion of undamaged nuts was removed after examination than without examination. These results revealed that although most EH nuts have low feeding value, they remain an important food resource. Mice use olfactory cues to avoid EH nuts and select undamaged nuts; however, the additional evaluation time may increase their risk from predators and competitors.

DOI： 10.1038/s41598-025-25025-0

山地源流域に生息するネバタゴガエルの水域環境利用様式の解明査読有り Open Access

澤入健太, 杉浦公亮, 大谷忠興, 梶村恒

中部森林研究 73 巻 ( 0 ) 頁： 57 - 62 2025年6月

担当区分：最終著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：中部森林学会

水辺林を利用する両生類は，水域と陸域の両方の自然環境を要求するため，生物多様性を考慮した水辺林管理の指標となる。山地源流域ではネバタゴガエルが特異的に繁殖しており，特に重要な指標種である。しかし，本種は分布が中部地方の一部に限られ，保全のために生態学的な知見が不可欠である。そこで著者らは，2023-2024年に愛知県内で成体の鳴き声モニタリング（3地域），幼体の目視センサスと環境調査（1地域）を行い，繁殖時期と繁殖場所の選好性を定量化した。その結果，本種は地下の産卵サイトが形成されやすく，水温が高い環境を選好していた。また，繁殖時期は地域間で大きく異なり，地域ごとの適切な保全の必要性が示唆された。

DOI： 10.60341/chufr.73.0_57

Open Access

CiNii Research

Growth Process and Mortality of Sasa borealis Seedlings over Six Years Following Mass Flowering and Factors Influencing Them 査読有り国際誌 Open Access

Suzuki, H; Kajimura, H

BIOLOGY-BASEL 14 巻 ( 5 ) 2025年5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）出版者・発行元：Biology

The sexual reproduction of Sasa borealis, a species of dwarf bamboo, occurred in central Japan from 2016 to 2017. S. borealis grows on the forest floor and serves as an important source of habitat and food for various animals. Sexual reproduction occurs in synchrony among individuals in a given area, leading to a decline in population and causing substantial disturbances to the forest ecosystem; however, the subsequent regeneration process remains unclear. In this study, we investigated S. borealis seedling regeneration over six years. Fixed plots were established in the forest in the year following the sexual reproductive event, and the growth of seedlings was monitored from seed emergence to seedling growth at the individual level. We considered biotic and abiotic factors to evaluate their influence on regeneration. We examined mammalian and arthropod foraging as biotic factors. Conversely, abiotic factors included temperature and humidity near the ground surface, solar radiation, soil conditions, and snow cover. Seedling growth was characterized by a slow rate and affected by morphological changes resulting from foraging and abiotic factors. The return of S. borealis to its presexual reproductive stage requires an extended duration. Our study provides precious information for future S. borealis conservation and management strategies.

DOI： 10.3390/biology14050516

Ecological traits of three species of Xiphydria woodwasps from Japan: Host tree species and eggs, symbiotic fungi, and mucus in their bodies 査読有り国際誌

Takagi, R; Kajimura, H

FORESTS 16 巻 ( 2 ) 2025年2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）出版者・発行元：MDPI

Woodwasps (Siricidae and Xiphydriidae) inhabit living, weakened, or freshly dead trees and their larvae feed on sapwood. Siricidae have been intensively researched for pest management. In contrast, the ecology of Xiphydriidae remains largely unknown. In the present study, we collected xiphydriid woodwasp adults and dissected female adults to elucidate the cornerstone ecology of this family and compared these findings with those of siricid woodwasps. The findings provide new host records for these species and indicate that their host ranges span multiple families. Notably, all Xiphydria species had female-biased sex ratios. All adult females had gourd-shaped eggs, similar to those found in gall wasps (Cynipidae), which contrast with the oval-shaped eggs of Siricidae. Slit-like mycangia were located at the base of the ovipositor, with pairs of fungal masses composed of hyphal fragments or spores directly positioned below the seventh sternum, differing structurally from the pouch-like mycangia in Siricidae. Mucus reservoirs and secretory glands were found in the terminal abdominal segments, similar to Siricidae. Mucus in X. annulitibia and X. ogasawarai was colorless and transparent, as reported in Siricidae, whereas X. eborata exhibited deep wine-red mucus, which is the world’s first discovery in all dissected species of Siricidae and Xiphydriidae.

DOI： 10.3390/f16020264

Web of Science

Scopus

その他リンク： https://www.mdpi.com/1999-4907/16/2/264

Wood mice utilize understory vegetation of leafless dead dwarf bamboo culms as a habitat and foraging site 査読有り国際誌

Kajita, R and Kajimura, H

DIVERSITY 16 巻 ( 8 ) 2024年8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）出版者・発行元：MDPI

In this study, we conducted a field survey in Aichi Prefecture, central Japan, to clarify whether rodent activity is affected by the presence or absence of dead culms of the dwarf bamboo Sasa borealis, a species characterized by a 120-year cycle of large-scale flowering, seeding, and dying. We found that a relatively larger number of wood mice, Apodemus speciosus and Apodemus argenteus, were caught using Sherman live traps in areas with dead S. borealis culms than in areas lacking the culms, thereby indicating that S. borealis culms, even if dead and leafless, can function as shelters in which the mice can evade predation. However, in the years when A. speciosus was abundant, A. argenteus avoided areas inhabited by A. speciosus and was restricted to areas lacking dead culms, which were devoid of shelter. A feeding experiment using Castanea crenata acorns clearly revealed that a larger number of acorns were foraged by mice in areas containing dead culms. Moreover, in the area with dead culms, the mice preferentially removed sound acorns prior to taking acorns that had been vacated by infesting moth larvae. These findings indicate that the shelter function of dead culms enables mice to carefully select sound acorns, which are nutritionally more beneficial than those that have been infested by moth larvae.

DOI： 10.3390/d16080458

Web of Science

Scopus

その他リンク： https://www.mdpi.com/1424-2818/16/8/458

Arboreal or terrestrial: Oviposition site of Zhangixalus frogs affects the thermal function of foam nests 査読有り国際誌

Ichioka, Y; Kajimura, H

ECOLOGY AND EVOLUTION 14 巻 ( 3 ) 頁： e10926 2024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）出版者・発行元：WILEY

Temperature is essential for the survival and development of eggs. Some anurans have evolved and developed foam nesting traits, with thermal insulation considered to be among their functions. Foam-nesting frogs tend to exhibit reproductive plasticity. For example, they oviposit on both trees and the ground. How such plasticity affects foam nest function is of major relevance and is likely related to the adaptation of foam nesting frogs. However, this has not been well studied. In this study, we examined the interaction between foam nest site, foam nest function, and egg fate using the Japanese green tree frog, Zhangixalus arboreus, and analysed how nest site differences (arboreal or terrestrial) affect the thermal function of foam nests. We compared the thermal functions of foam nests between arboreal and terrestrial oviposition sites of Z. arboreus. We artificially replaced half of the arboreal nests with terrestrial environments and recorded temperature in and outside of the experimental terrestrial nest and original arboreal nests. We also examined egg survival and hatching rates for all the nests. The results indicated superior heat insulation in terrestrial nests, with warmer temperatures inside than outside the nests, especially at night, which led to a high egg survival rate. Therefore, terrestrial ovipositing should be valid under cold weather conditions. This may be related to the evolutionary history of oviposition site plasticity of this genus, which originally had an arboreal oviposition trait but evolved into terrestrial site use owing to global cooling. Our novel insights into the evolution and adaptivity of foam nesting and oviposition site use in Z. arboreus make an important contribution to animal ecology.

DOI： 10.1002/ece3.10926

Web of Science

Scopus

PubMed

その他リンク： https://onlinelibrary.wiley.com/doi/10.1002/ece3.10926

Fusarium kuroshium is the primary fungal symbiont of an ambrosia beetle, Euwallacea fornicatus, and can kill mango tree in Japan 査読有り国際共著国際誌 Open Access

Jiang, ZR; Tanoue, M; Masuya, H; Smith, SM; Cognato, AI; Kameyama, N; Kuroda, K; Kajimura, H

SCIENTIFIC REPORTS 13 巻 ( 1 ) 頁： 21634 2023年12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）

This study identifies fungi associated with Euwallacea fornicatus and determines whether these fungal species play the role of primary symbiont. E. fornicatus adults that emerged from the branches of infested trees in Okinawa main island, Japan, were collected and used to isolate fungi. Fusarium kuroshium and Penicillium citrinum were the most dominant fungal associates of females and males, respectively. F. kuroshium was much more frequently isolated from the head, including mycangia (fungus-carrying organs), of females than any other body parts. We inoculated healthy mango saplings with F. kuroshium or F. decemcellulare, both of which were symbionts of E. fornicatus females infesting mango trees. F. kuroshium decreased leaf stomatal conductance and rate of xylem sap-conduction area and increased length and area of xylem discoloration of the saplings, thereby weakening and killing some. These results suggest that F. kuroshium, a mycangial fungus of E. fornicatus, inhibits water flow in mango trees. This study is the first to report that F. kuroshium causes wilt disease in mango trees and that it is a primary fungal symbiont of E. fornicatus.

DOI： 10.1038/s41598-023-48809-8

How much do field mice prefer dwarf bamboo seeds? Two-choice experiments between seeds of Sasa borealis and several tree species on the forest floor 査読有り国際誌 Open Access

Suzuki, H; Kajimura, H

ECOLOGY AND EVOLUTION 13 巻 ( 10 ) 頁： e10636 2023年10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）出版者・発行元：Ecology and Evolution

Bambusoideae is a taxon of mass-flowering monocarpic perennials with a long life cycle. Forest ecosystems are affected by Bambusoideae seeding and death events in various ways, including an increased abundance of Apodemus spp. The utilization and preference of dwarf bamboo seeds over tree seeds by field mice remain elusive. Therefore, we aimed to determine whether field mice prefer dwarf bamboo to tree seeds. We examined one dwarf bamboo species (Sasa borealis) against four tree species with varying acorn/fruit traits (Castanea crenata, Quercus crispula, Fagus crenata, and Lindera triloba). The seeds were placed in a container in a forest among dead S. borealis culms, with an automatic camera monitoring the setup. The examined seeds were mainly foraged by two field mouse species, Apodemus speciosus and Apodemus argenteus, with preference in the following order: C. crenata, L. triloba, S. borealis, F. crenata, and Q. crispula. Our findings indicated that during S. borealis mast seeding years, predation pressure on F. crenata and Q. crispula seeds could be considerably reduced. This suggests that mast seeding might disrupt the normal pattern of survival, and seed dispersal patterns, potentially altering the forest vegetation composition.

DOI： 10.1002/ece3.10636

Utilization of Sasa borealis seeds by Japanese field mouse: discovery of small-seed caching 査読有り国際誌 Open Access

Suzuki, H; Kajimura, H

FRONTIERS IN ECOLOGY AND EVOLUTION 11 巻 2023年8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）出版者・発行元：Frontiers in Ecology and Evolution

Bambusoideae are well-known for their large-scale flowering, seeding, and death events that occur after a vegetative phase that can often last for decades. These events are a valuable resource for many animals. Their mast seeding, in particular, affects rodent populations although the causal relationship between them is speculative. Moreover, the species of animals that utilize this resource also remains unclear. Therefore, this study aimed to examine the interaction between mast seeding plants and animals by conducting a feeding test using the seeds of a dwarf bamboo species (Sasa borealis) at different seasons and in different forest types. The results revealed that two mouse species, Apodemus speciosus and A. argenteus, utilized the seeds. They both predated as well as removed and sometimes buried the seeds, exhibiting small-seed caching behavior. Furthermore, A. speciosus was found to exhibit higher seed predation at covered sites and switching to removal behavior at the more exposed, open sites, while A. argenteus showed no distinguishable trends. Additionally, A. speciosus utilized the seeds less frequently in fall than in summer, suggesting a shift in diet towards acorns when available. Collectively, the results of this study provide novel insights into the interaction between mast seeding plants and the animals that utilize them.

DOI： 10.3389/fevo.2023.1124393

Open Access

Web of Science

Scopus

The worldwide invasion history of a pest ambrosia beetle inferred using population genomics 査読有り国際共著国際誌 Open Access

Urvois, T; Perrier, C; Roques, A; Sauné, L; Courtin, C; Kajimura, H; Hulcr, J; Cognato, AI; Auger-Rozenberg, MA; Kerdelhué, C

MOLECULAR ECOLOGY 32 巻 ( 15 ) 頁： 4381 - 4400 2023年8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：Molecular Ecology

Xylosandrus crassiusculus, a fungus-farming wood borer native to Southeastern Asia, is the most rapidly spreading invasive ambrosia species worldwide. Previous studies focusing on its genetic structure suggested the existence of cryptic genetic variation in this species. Yet, these studies used different genetic markers, focused on different geographical areas and did not include Europe. Our first goal was to determine the worldwide genetic structure of this species based on both mitochondrial and genomic markers. Our second goal was to study X. crassiusculus' invasion history on a global level and identify the origins of the invasion in Europe. We used a COI and RAD sequencing design to characterize 188 and 206 specimens worldwide, building the most comprehensive genetic data set for any ambrosia beetle to date. The results were largely consistent between markers. Two differentiated genetic clusters were invasive, albeit in different regions of the world. The markers were inconsistent only for a few specimens found exclusively in Japan. Mainland USA could have acted as a source for further expansion to Canada and Argentina through stepping stone expansion and bridgehead events. We showed that Europe was only colonized by Cluster II through a complex invasion history including several arrivals from multiple origins in the native area, and possibly including bridgehead from the United States. Our results also suggested that Spain was colonized directly from Italy through intracontinental dispersion. It is unclear whether the mutually exclusive allopatric distribution of the two clusters is due to neutral effects or due to different ecological requirements.

DOI： 10.1111/mec.16993

Web of Science

Scopus

PubMed

キツツキ類の採餌木と営巣木の特徴を探る－枯死木を保残する森林管理指針の検討－査読有り Open Access

田畑望実, 梶村恒

中部森林研究 71 巻頁： 73 - 76 2023年6月

菌栽培をめぐる樹木穿孔性昆虫の駆け引き：養菌窃盗性キクイムシの生態．招待有り

梶村恒

細胞 55 巻頁： 50 - 51 2023年5月

Bursaphelenchus hibisci n. sp. (Nematoda: Aphelenchoididae) isolated from Ernoporus corpulentus (Scolytinae) emerged from dead Hibiscus tiliaceus (Malvaceae) twigs from Okinawa, Japan 査読有り国際誌

Kanzaki Natsumi, Tsujimoto Satoshi, Kajimura Hisashi

NEMATOLOGY 24 巻 ( 1 ) 頁： 21 - 36 2022年12月

The role of mycangial fungi associated with ambrosia beetles (Euwallacea interjectus) in fig wilt disease: dual inoculation of Fusarium kuroshium and Ceratocystis ficicola can bring fig saplings to early symptom development 査読有り国際誌 Open Access

Jiang, Z.-R., Morita, T., Jikumaru, S., Kuroda, K., Masuya, H. and Kajimura, H.

Microorganisms 10 巻 2022年9月

Fungal Flora in Adult Females of the Rearing Population of Ambrosia Beetle Euwallacea interjectus (Blandford) (Coleoptera: Curculionidae: Scolytinae): Does It Differ from the Wild Population? 査読有り国際誌 Open Access

Jiang Zi-Ru, Masuya Hayato, Kajimura Hisashi

DIVERSITY 14 巻 ( 7 ) 2022年7月

How does the 120-year cycle mast seeding of dwarf bamboo affect the rodent population? 査読有り国際誌 Open Access

Suzuki Hanami, Kashiwagi Haruka, Kajimura Hisashi

ECOLOGICAL PROCESSES 11 巻 ( 1 ) 2022年6月

Two new insect-associated tylenchids, Sychnotylenchus hibisci n. sp. and Neoditylenchus xiphydriae n. sp. (Tylenchomorpha: Anguinidae), from Japan 査読有り国際誌

Kanzaki Natsumi, Kajimura Hisashi, Masuya Hayato, Akiba Mitsuteru, Ekino Taisuke, Tsujimoto Satoshi, Kosaka Hajime

Nematology 24 巻 ( 3 ) 頁： 257 - 282 2022年2月

Longer mtDNA Fragments Provide a Better Insight into the Genetic Diversity of the Sycamore Lace Bug, Corythucha ciliata (Say, 1832) (Tingidae, Hemiptera), Both in Its Native and Invaded Areas 査読有り国際共著国際誌 Open Access

Lakatos Ferenc, Tuba Katalin, Bender Boglarka, Kajimura Hisashi, Toth Viktoria

INSECTS 13 巻 ( 2 ) 2022年2月

Novel symbiotic association between Euwallacea ambrosia beetle and Fusarium fungus on fig trees in Japan 査読有り Open Access

Zi-Ru Jiang, Hayato Masuya and Hisashi Kajimura

Frontiers in Microbiology 12 巻 2021年9月

Description of Bursaphelenchus microcarpae n. sp. isolated from Cryphalus abbreviatus emerged from Ficus microcarpa, with a report of B. carpini re-isolation 査読有り

Kanzaki, N., Ekino T., Kajimura, H. and Degawa, Y.

Nematology 23 巻 ( 7 ) 頁： 743 - 759 2021年7月

　前のページ - 次のページ　

<梶村 恒>

論文 - 梶村 恒

<梶村　恒>

論文 - 梶村　恒