研究者詳細 - 兵藤　不二夫

論文 - 兵藤　不二夫

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Arbuscular Mycorrhizal Community in Roots and Nitrogen Uptake Patterns of Understory Trees Beneath Ectomycorrhizal and Non-ectomycorrhizal Overstory Trees 国際誌

Chikae Tatsumi, Fujio Hyodo, Takeshi Taniguchi, Weiyu Shi, Keisuke Koba, Keitaro Fukushima, Sheng Du, Norikazu Yamanaka, Pamela Templer, Ryunosuke Tateno

Frontiers in Plant Science 11 583585 - 583585 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Nitrogen (N) is an essential plant nutrient, and plants can take up N from several sources, including via mycorrhizal fungal associations. The N uptake patterns of understory plants may vary beneath different types of overstory trees, especially through the difference in their type of mycorrhizal association (arbuscular mycorrhizal, AM; or ectomycorrhizal, ECM), because soil mycorrhizal community and N availability differ beneath AM (non-ECM) and ECM overstory trees (e.g., relatively low nitrate content beneath ECM overstory trees). To test this hypothesis, we examined six co-existing AM-symbiotic understory tree species common beneath both AM-symbiotic black locust (non-ECM) and ECM-symbiotic oak trees of dryland forests in China. We measured AM fungal community composition of roots and natural abundance stable isotopic composition of N (δ N) in plant leaves, roots, and soils. The root mycorrhizal community composition of understory trees did not significantly differ between beneath non-ECM and ECM overstory trees, although some OTUs more frequently appeared beneath non-ECM trees. Understory trees beneath non-ECM overstory trees had similar δ N values in leaves and soil nitrate, suggesting that they took up most of their nitrogen as nitrate. Beneath ECM overstory trees, understory trees had consistently lower leaf than root δ N, suggesting they depended on mycorrhizal fungi for N acquisition since mycorrhizal fungi transfer isotopically light N to host plants. Additionally, leaf N concentrations in the understory trees were lower beneath ECM than the non-ECM overstory trees. Our results show that, without large differences in root mycorrhizal community, the N uptake patterns of understory trees vary between beneath different overstory trees. 15 15 15

DOI： 10.3389/fpls.2020.583585

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Diet niche segregation of co-occurring larval stages of mesopelagic and commercially important fishes in the Osumi Strait assessed through morphological, DNA metabarcoding, and stable isotope analyses

Gen Kume, Toru Kobari, Junya Hirai, Hiroumi Kuroda, Tsutomu Takeda, Mutsuo Ichinomiya, Tomohiro Komorita, Maki Aita-Noguchi, Fujio Hyodo

Marine Biology 168 ( 1 ) 2021年1月

掲載種別：研究論文（学術雑誌）

The Osumi Strait and its neighboring waters are major spawning grounds for commercially important small pelagic and coastal fish in the Pacific coastal area of Japan. Mesopelagic fish larvae are also abundant here, co-occurring with the larvae of commercial species. However, it is unknown whether these fish groups compete for prey. We examined the diet of four commercial fish groups (Engraulis japonicus, Trachurus japonicus, Triglidae spp., and Sebastiscus spp.) and two mesopelagic species (Sigmops gracilis, Myctophum asperum) during their larval stages to determine whether they had the same prey source. Morphological analysis and DNA metabarcoding of gut contents showed that the main prey species of all six fish groups were calanoid copepods. However, results from metabarcoding differed greatly from morphological analysis, showing that appendicularians were abundant in the guts of S. gracilis, M. asperum, and Sebastiscus spp. This may be because the methods differ in how they determine prey composition, with morphological analysis relying on counts of identifiable prey parts and metabarcoding being only a semi-quantitative method. In addition, appendicularians might be underestimated by metabarcoding analysis due to variation in genome size, copy number of target genes, and primer mismatches. Stable isotope analysis supported the importance of appendicularians as prey for S. gracilis, M. asperum, and Sebastiscus spp. Our results indicate that the two mesopelagic species and Sebastiscus spp. may compete for prey, but E. japonicus, T. japonicus, and Triglidae spp. occupy niches different from those of the two mesopelagic species. Our results imply that the trophic pathway via appendicularians may support the feeding of dominant mesopelagic species and enable coexistence with commercial species in the study area.

DOI： 10.1007/s00227-020-03810-x

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Potential sources of ammonium-nitrogen in the coastal groundwater determined from a combined analysis of nitrogen isotope, biological and geological parameters, and land use

Anna Fadliah Rusydi, Shin Ichi Onodera, Mitsuyo Saito, Fujio Hyodo, Morihiro Maeda, Khori Sugianti, Sunarya Wibawa

Water (Switzerland) 13 ( 1 ) 2021年1月

掲載種別：研究論文（学術雑誌）

The origin of ammonium-nitrogen in Indonesian coastal groundwater has not been intensively examined, meanwhile the elevated concentration remains a concern. This research aims at tracing the potential sources of ammonium-nitrogen in the groundwater of Indramayu, Indonesia where groundwater is vital for livelihood. From results, a combined examination of nitrogen isotope, coliform bacteria, land-use, and geology confirmed the natural and anthropogenic origins of ammonium-nitrogen in the groundwater. In the brackish-water aquaculture region, groundwater has δ N values from +1.8 to +4.8‰ signifying that ammonium-nitrogen is derived from mineralization of organic nitrogen to ammonium. Furthermore, ammonium has a significantly positive relationship with sodium indicating the exchangeable ammonium is mobilized to groundwater via cation exchange. Meanwhile ammonium-nitrogen from anthropogenic waste was detected in agricultural and residential region. The groundwater has more varied δ N values, from −2.9 to +16.1‰, which implies attenuation of ammonium-nitrogen from several sources namely manure, mineral fertilizer, sewage, and pit latrines. Also, the presence of E. coli confirms the indication of human and animal waste contamination. However, since ammonium has no relationship with sodium, cation exchange is not feasible and ammonium-nitrogen flows into the groundwater from anthropogenic sources along with liquid wastes. 15 15 NH4 NH4

DOI： 10.3390/w13010025

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Changes in stable nitrogen isotopes of plants, bulk soil and soil dissolved N during ecosystem retrogression in boreal forest

Fujio Hyodo, Yu Takebayashi, Akiko Makabe, David A. Wardle, Keisuke Koba

Ecological Research 36 ( 3 ) 420 - 429 2021年

掲載種別：研究論文（学術雑誌）

Stable nitrogen isotope ratios (δ N) of plants and soil have been used to study changes in the N cycle during ecosystem succession and retrogression. However, little is known about how δ N of soil mineral N and dissolved organic N (DON) change during retrogression, despite their potential to inform on processes contributing to N loss. Here, we examined the δ N of NH and DON together with δ N of the dominant plant species and bulk soil across a 5,000-year-old retrogressive chronosequence of forested islands in northern Sweden. The δ N of bulk soil N, NH and DON did not change greatly during retrogression, suggesting that there are no major losses of N from the system. The δ N of NH and DON was significantly correlated with that of bulk soil N across islands, indicating that bulk soil N is an important determinant of the δ N of dissolved soil N. The δ N of DON was significantly higher than those of NH and bulk soil N, probably because of the inclusion of microbial N to the DON fraction. Despite the lack of changes in δ N of soil N as retrogression proceeded, the δ N of most plant species increased. These results suggest that despite the relative importance of the three underlying mechanisms involved is unclear, the N resources of plants change in response to retrogression: they have an increasing reliance on DON, a decreasing dependence on N transferred from the mycorrhizal fungi and reduced reliance on N from surface soil layers as retrogression proceeds. 15 15 15 + 15 15 + 15 + 15 15 + 15 15 4 4 4 4

DOI： 10.1111/1440-1703.12208

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元素分析計連結型安定同位体比質量分析計の簡易改造による微量試料炭素窒素安定同位体比測定

木庭啓介, 木下桂, 大西雄二, 福島慶太郎, 尾坂兼一, 松尾奈緒子, 舟川一穂, 瀬古祐吾, 目戸綾乃, 平澤理世, 小川奈々子, 兵藤不二夫, 由水千景

RADIOISOTOPES (Web) 70 ( 4 ) 2021年

Constraints on the jumping and prey-capture abilities of ant-mimicking spiders (Salticidae, Salticinae, Myrmarachne) 査読

Yoshiaki Hashimoto, Tomoji Endo, Takeshi Yamasaki, Fujio Hyodo, Takao Itioka

Scientific Reports 10 ( 1 ) 2020年12月

掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

<title>Abstract</title>
Accurate morphological ant mimicry by <italic>Myrmarachne</italic> jumping spiders confers strong protective benefits against predators. However, it has been hypothesized that the slender and constricted ant-like appearance imposes costs on the hunting ability because their jumping power to capture prey is obtained from hydraulic pressure in their bodies. This hypothesis remains to be sufficiently investigated. We compared the jumping and prey-capture abilities of seven <italic>Myrmarachne</italic> species and non-myrmecomorphic salticids collected from tropical forests in Malaysian Borneo and northeastern Thailand. We found that the mimics had significantly reduced abilities compared with the non-mimics. The analysis using geometric morphometric techniques revealed that the reduced abilities were strongly associated with the morphological traits for ant mimicry and relatively lower abilities were found in <italic>Myrmarachne</italic> species with a more narrowed form. These results support the hypothesis that the jumping ability to capture prey is constrained by the morphological mimicry and provide a new insight into understanding the evolutionary costs of accurate mimicry.

DOI： 10.1038/s41598-020-75010-y

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その他リンク： http://www.nature.com/articles/s41598-020-75010-y

Volcanic deposits affect soil nitrogen dynamics and fungal-bacterial dominance in temperate forests 査読

Tomohiro Yokobe, Fujio Hyodo, Naoko Tokuchi

SOIL BIOLOGY & BIOCHEMISTRY 150 108011 - 108011 2020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：PERGAMON-ELSEVIER SCIENCE LTD

Volcanic deposits increase soil organic carbon storage. However, little is known about the effect of volcanic deposits on forest soil nitrogen (N) dynamics and microbial communities. We explored gross and net N transformation rates and microbial community structure using a phospholipid fatty acid (PLFA) method across eight forests with soils derived from different parent material in Japan. Volcanic mineral soils had approximately three-fold greater total N and inorganic N contents and gross nitrification, ammonium immobilization, and nitrate immobilization rates that were one order of magnitude higher than in non-volcanic soils. Moreover, volcanic mineral soils had a 1.7-fold lower N turnover rate, which was estimated as net N mineralization rate per soil N. This was likely caused by a higher gross N immobilization rate, potentially due to the mineral traits of volcanic soils. Volcanic mineral soils had approximately four- and three-fold greater microbial biomass-N and bacterial PLFA contents, respectively, and the fungal:bacterial PLFA ratio was lower in volcanic mineral soils than in non-volcanic soils. Microbial community structure, analyzed using non-metric multidimensional scaling, was distinct between volcanic and non-volcanic soils, and was significantly affected by soil characteristics. This study demonstrates that aside from soil carbon storage, volcanic deposits are related to increases in soil N immobilization, N content, bacterial biomass, and N transformation rates in forest ecosystems.

DOI： 10.1016/j.soilbio.2020.108011

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A new species of the genus Agorius (Araneae: Salticidae) from Sarawak, Borneo 査読

Takeshi Yamasaki, Yoshiaki Hashimoto, Tomoji Endo, Fujio Hyodo, Itioka Takao, Paulus Meleng

Acta Arachnologica 69 ( 1 ) 37 - 41 2020年6月

A new corinnid species of the genus aetius Pickard-Cambridge (Araneae: Corinnidae) from Sarawak, Borneo

Takeshi Yamasaki, Fujio Hyodo, Takao Itioka, Yoshiaki Hashimoto, Tomoji Endo, Paulus Meleng

Acta Arachnologica 69 ( 2 ) 105 - 108 2020年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Arachnological Society of Japan

Aetius bicuspidatus sp. nov. (Araneae: Corinnidae) is described here on the basis of male and female specimens collected from the Lambir Hills National Park, Sarawak, Borneo. The posterior carapace is elongated with bicuspid edge in both male and female. This character condition is very unique among Aetius species.

DOI： 10.2476/asjaa.69.105

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Stable and radio-isotopic signatures reveal how the feeding habits of ants respond to natural secondary succession in a cool-temperate forest

H. O. Tanaka, T. F. Haraguchi, I. Tayasu, F. Hyodo

Insectes Sociaux 66 37 - 46 2019年2月

How can we quantitatively study insects whose larvae live beneath the forest floor? A case study at an experimental long-term log-removal site in Japan

Tomonori Tsunoda, Fujio Hyodo, Daisuke Sugiura, Nobuhiro Kaneko, Satoshi N. Suzuki

Entomological Science 22 ( 3 ) 275 - 282 2019年1月

Stable isotope analysis reveals the importance of plant-based diets for tropical ant-mimicking spiders

Fujio Hyodo, Takeshi Yamasaki, Takuya Iwasa, Takao Itioka, Tomoji Endo, Yoshiaki Hashimoto

Entomological Science 21 461 - 468 2018年12月

New species of the ant-mimicking genus Myrmarachne MacLeay, 1839 (Araneae: Salticidae) from Sarawak, Borneo

Takeshi Yamasaki, Yoshiaki Hashimoto, Tomoji Endo, Fujio Hyodo, Takao Itioka, Paulus Meleng

Zootaxa 4521 ( 3 ) 335 - 356 2018年11月

Foraging association between myxomycetes and fungal communities on coarse woody debris

Yu Fukasawa, Yu Fukasawa, Fujio Hyodo, Shin ichi Kawakami

Soil Biology and Biochemistry 121 95 - 102 2018年6月

Seasonal effects on microbial community structure and nitrogen dynamics in temperate forest soil

Tomohiro Yokobe, Fujio Hyodo, Naoko Tokuchi

Forests 9 ( 3 ) 2018年3月

野外操作実験で解き明かす「樹上性」の適応的意義~木登りカタツムリサッポロマイマイを例として

佐伯いく代, 丹羽慈, 長田典之, 兵藤不二夫, 太田民久, 大石善隆, 日浦勉

Venus 75 ( 1/4 ) A.21‐A.22 2017年11月

Radiocarbon analysis reveals expanded diet breadth associates with the invasion of a predatory ant

Wataru Suehiro, Fujio Hyodo, Hiroshi O. Tanaka, Chihiro Himuro, Tomoyuki Yokoi, Shigeto Dobata, Benoit Guenard, Robert R. Dunn, Edward L. Vargo, Kazuki Tsuji, Kenji Matsuura

SCIENTIFIC REPORTS 7 2017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：NATURE PUBLISHING GROUP

Invasions are ecologically destructive and can threaten biodiversity. Trophic flexibility has been proposed as a mechanism facilitating invasion, with more flexible species better able to invade. The termite hunting needle ant Brachyponera chinensis was introduced from East Asia to the United States where it disrupts native ecosystems. We show that B. chinensis has expanded dietary breadth without shifting trophic position in its introduced range. Transect sampling of ants and termites revealed a negative correlation between the abundance of B. chinensis and the abundance of other ants in introduced populations, but this pattern was not as strong in the native range. Both termite and B. chinensis abundance were higher in the introduced range than in native range. Radiocarbon (C-14) analysis revealed that B. chinensis has significantly younger 'diet age', the time lag between carbon fixation by photosynthesis and its use by the consumer, in the introduced range than in the native range, while stable isotope analyses showed no change. These results suggest that in the introduced range B. chinensis remains a termite predator but also feeds on other consumer invertebrates with younger diet ages such as herbivorous insects. Radiocarbon analysis allowed us to elucidate cryptic dietary change associated with invasion success.

DOI： 10.1038/s41598-017-15105-1

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Adaptive significance of arboreality: field evidence from a tree-climbing land snail

Ikuyo Saeki, Shigeru Niwa, Noriyuki Osada, Fujio Hyodo, Tamihisa Ohta, Yoshitaka Oishi, Tsutom Hiura

ANIMAL BEHAVIOUR 127 53 - 66 2017年5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：ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

Arboreality has evolved in a wide range of taxa, but its adaptive significance has rarely been examined in natural ecosystems. Euhadra brandtii sapporo is an arboreal land snail distributed in a restricted area of Hokkaido, Japan. We hypothesized that arboreality provides the species with significant survival advantages, which we tested via field observations and experiments. A monitoring census showed that E. b. sapporo hibernates in winter in the ground litter, climbs into the canopy in early spring and returns to the ground in late autumn. This seasonal movement appears to be effective for escaping from predation by ground-dwelling carabine beetles, whose activity was high during the summer based on a pitfall-trap census. Manipulative field experiments were conducted to compare survival rates in arboreal and ground-dwelling environments. We collected 120 E. b. sapporo individuals in summer and tethered 40 in tree canopies and 80 on the ground; half those on the ground were covered by baskets to prevent predation by large animals. The survival rate after 11 days was highest in the canopy, followed by that on the ground with a basket and was lowest on the ground without a basket. Predation was the main cause of death, but some died from other causes. Similar results were obtained in autumn, except for higher survival rates of the ground treatments. Analyses of carbon and nitrogen isotope ratios suggest that the land snail uses epiphytic lichens and mosses as food resources. In conclusion, arboreality has a marked advantage in reducing mortality in E. b. sapporo and is probably supported by food availability as well. (C) 2017 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.anbehav.2017.02.022

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Recent progress in ecological studies of soil fauna

Motohiro Hasegawa, Saori Fujii, Satoshi Kaneda, Hiroshi Ikeda, Takuo Hishi, Fujio Hyodo, Makoto Kobayashi

Japanese Journal of Ecology 67 ( 2 ) 95 - 118 2017年1月

Variations in lignin-derived phenols in sediments of Japanese lakes over the last century and their relation to watershed vegetation

Fujio Hyodo, Michinobu Kuwae, Naoko Sasaki, Ryoma Hayashi, Wataru Makino, Soichiro Kusaka, Narumi K. Tsugeki, Seiji Ishida, Hajime Ohtsuki, Kohei Omoto, Jotaro Urabe

ORGANIC GEOCHEMISTRY 103 125 - 135 2017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：PERGAMON-ELSEVIER SCIENCE LTD

Lignins have been used as a biomarker to explore changes in terrestrial organic matter input into lakes and to investigate past watershed vegetation. Burial of organic carbon (OC) in lake sediments, an important component of the global C cycle, is likely associated with the terrestrial OC input. However, few studies have explored changes in terrestrial C input into lakes in the last century. Furthermore, the relationship between lignin phenol compositions and watershed vegetation remains poorly examined. In this study, we examined changes in OC concentrations, OC mass accumulation rates (MAR), and lignin phenol compositions over the last century in sediments from six lakes in Japan that differ in watershed land-use and vegetation. The sediments were dated using Pb-210 and Cs-137, and showed increased OC concentrations and MARs in three lowland lakes over the last century. This pattern was not found in three mountain lakes. In one of the lowland lakes, lignin phenol concentrations normalized to OC did not change during the periods with high OC concentrations and MARs. This indicates that not only eutrophication but also enhanced terrestrial OC input could lead to greater burial of OC. The lignin phenol compositions did not show clear trends over the last century in most of the lakes examined. The ratios of syringyl to vanillyl phenols and the lignin phenol vegetation index had significant relationships with proportions of angiosperms in watershed vegetation. These results demonstrate that lignin phenols are useful in inferring recent as well as past changes in lake watershed environments. (c) 2016 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.orggeochem.2016.11.001

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論文 - 兵藤 不二夫

<兵藤　不二夫>

論文 - 兵藤　不二夫