〔Major achievements〕The left–right-handedness of the cylindrical spathe correlates with the phyllotactic spiral direction in Arisaema (Araceae)
Tetsuya K. Matsumoto; Kodai N. Sato; Junichi Ohno; Tokiyoshi Hiramatsu; Jin Murata, Lead, Springer Science and Business Media LLC
The Science of Nature, 26 Feb. 2025, [Reviewed]

〔Major achievements〕When is lethal deceptive pollination maintained? A population dynamics approach
Takefumi Nakazawa; Tetsuya K. Matsumoto; Koki R. Katsuhara
Annals of Botany, Oct. 2024, [Reviewed]

Pollinators of Arisaema nambae (Araceae), endemic to Okayama and Hiroshima Prefectures, western Japan
Tetsuta Kubo; Tetsuya K. Matsumoto; Yuko Miyazaki; Okihito Yano
Journal of Asia-Pacific Biodiversity, Mar. 2024, [Reviewed]

〔Major achievements〕A malformation of sex-changing plant Arisaema serratum (Araceae) produces both male and female inflorescences
Tetsuya K. Matsumoto; Ryohei Fujisato; Munetaka Sugiyama; Yuko Miyazaki; Jin Murata, Lead, The genus Arisaema (Araceae) can change sex expression between male and female with increasing plant size (sequential hermaphrodism). As most Arisaema species have only one inflorescence on each individual, sex expression is seemingly determined at the individual level. However, malformations with male and female inflorescences have occasionally been observed. Unfortunately, their developmental origin is unclear because of a lack of detailed descriptions of the shoot structure. To estimate the unit of sex determination in Arisaema, we observed the morphology of an aberrant individual of Arisaema serratum (Thunberg) Schott with multiple inflorescences for three years. In the second year, the aberrant individual produced pure male and female inflorescences. Based on the phyllotactic pattern of this malformation, we estimated that the inflorescences were duplicated due to a broadening of the apical meristem via fasciation. Contrary to other Arisaema plants with multiple inflorescences reported previously, the corm of the aberrant individual did not subdivide nor branch spontaneously after the growing season for three years. Thus, duplicated inflorescences presumably shared the resource supply without physiological partitioning during sex determination. These results imply that sex expression is determined at the inflorescence level but not at the individual or floret levels in dioecious Arisaema., TAYLOR & FRANCIS LTD
Botany Letters, Feb. 2024, [Reviewed]

Two closely related species of the Arisaema ovale group (Araceae) selectively attract male fungus gnats of different Anatella species (Diptera: Mycetophilidae)
Tetsuya K. Matsumoto; Masahiro Sueyoshi; Shigetaka Sakata; Yuko Miyazaki; Muneto Hirobe, Lead
Plant Systematics and Evolution, Jan. 2023, [Reviewed]

Gall midge pollination and ant-mediated fruit dispersal of Pinellia tripartita (Araceae)
Tetsuya K. Matsumoto; Motoya Onoue; Takashi Miyake; Kentaro Ohnishi; Kiyoto Takazoe; Muneto Hirobe; Yuko Miyazaki, Lead, Springer Science and Business Media LLC
Plant Ecology, Jan. 2023, [Reviewed]

Distribution of Arisaema angustatum (Araceae) in the eastern Chugoku Mountains, Japan　　　　　　　　　　　　　　　
Tetsuya K. Matsumoto; Shigeo Takasugi, Lead
Journal of Japanese Botany, Oct. 2022, [Reviewed]

〔Major achievements〕Application of multivariate morphometrics to delimit three Japanese species of Arisaema sect. Pistillata (Araceae)　　　　　　　　　　　　　　　
Tetsuya K. Matsumoto, Lead
Nordic Journal of Botany, Oct. 2021, [Reviewed]

Pinellia pedatisecta (Araceae) for botanical research　　　　　　　　　　　　　　　
Jin Murata; Tetsuya K. Matsumoto
The Journal of Phytogeography and Taxonomy, May 2021, [Reviewed], [Invited]

Effects of large-scale forest fire followed by illegal logging on the regeneration of boreal forests in Mongolia
Keiji Sakamoto; Misaki Tomonari; Uyanga Ariya; Erika Nakagiri; Tetsuya K. Matsumoto; Yasuaki Akaji; Takashi Otoda; Muneto Hirobe; Baatarbileg Nachin, Springer Science and Business Media LLC
Landscape and Ecological Engineering, Apr. 2021, [Reviewed]

〔Major achievements〕Selective pollination by fungus gnats potentially functions as an alternative reproductive isolation among five Arisaema species
Tetsuya K Matsumoto; Muneto Hirobe; Masahiro Sueyoshi; Yuko Miyazaki, Lead, BACKGROUND AND AIMS: Interspecific difference in pollinators (pollinator isolation) is important for reproductive isolation in flowering plants. Species-specific pollination by fungus gnats has been discovered in several plant taxa, suggesting that they can contribute to reproductive isolation. Nevertheless, their contribution has not been studied in detail, partly because they are too small for field observations during flower visitation. To quantify their flower visitation, we used the genus Arisaema (Araceae) because the pitcher-like spathe of Arisaema can trap all floral visitors. METHODS: We evaluated floral visitor assemblage in an altitudinal gradient including five Arisaema species. We also examined interspecific differences in altitudinal distribution (geographic isolation) and flowering phenology (phenological isolation). To exclude the effect of interspecific differences in altitudinal distribution on floral visitor assemblage, we established 10 experimental plots including the five Arisaema species on high- and low-altitude areas and collected floral visitors. We also collected floral visitors in three additional sites. Finally, we estimated the strength and contribution of these three reproductive barriers using the unified formula for reproductive isolation. KEY RESULTS: Each Arisaema species selectively attracted different fungus gnats in the altitudinal gradient, experimental plots, and additional sites. Altitudinal distribution and flowering phenology differed among the five Arisaema species, whereas the strength of geographic and phenological isolations were distinctly weaker than those in pollinator isolation. Nevertheless, the absolute contribution of pollinator isolation to total reproductive isolation was weaker than geographic and phenological isolations, because pollinator isolation functions after the two early-acting barriers in plant life history. CONCLUSIONS: Our results suggest that selective pollination by fungus gnats potentially contributes to reproductive isolation. Since geographic and phenological isolations can be disrupted by habitat disturbance and interannual climate change, the strong and stable pollinator isolation might compensate for the weakened early-acting barriers as an alternative reproductive isolation among the five Arisaema species.
Annals of Botany, Apr. 2021, [Reviewed]

Assemblage of beetles visiting inflorescences of two Arisaema species (Araceae)　　　　　　　　　　　　　　　
Tetsuya K. Matsumoto; Yoshihiro Senda, Lead
Sayabane, New Series, Jun. 2020, [Reviewed], [Invited]

A New Record for Arisaema heterophyllum (Araceae) from Eastern Tottori Prefecture, Japan
Tetsuya K. Matsumoto; Shigetaka Sakata, Lead, ツムラ
Journal of Japanese Botany, Feb. 2020, [Reviewed]

Population structures and spatial patterns of two unpalatable Arisaema species (Araceae) with and without clonal reproduction in a riparian forest intensively grazed by Sika deer
Tetsuya K. Matsumoto; Muneto Hirobe; Yasuaki Akaji; Yuko Miyazaki, Lead, General decline of understory cover can result from increased abundance of and foraging pressure by deer. But population size and degree of aggregation can increase for unpalatable understory plants that escape foraging pressure. Clonal reproduction can enable unpalatable plant species to increase their population sizes while trending toward spatially aggregated distributions. However, the details of the relationship between clonal reproduction in unpalatable plants and their dynamics under intensive deer herbivory are not clear. We compared the population structures and spatial patterns of two coexisting unpalatable plant species, Arisaema ovale (with clonal reproduction) and A. peninsulae (without clonal reproduction) in a riparian forest intensively grazed by Sika deer, and examined the null hypothesis that the extent of spatial aggregation and local population size would not differ between the clonal and non-clonal Arisaema species. In a 0.36-ha plot, A. ovale had a larger population size (1087 individuals) with a higher abundance ratio of small plants (p < 0.01) than A. peninsulae (84 individuals). Analyses of spatial point processes showed that both populations were spatially aggregated (p < 0.05). The spatial aggregation of A. peninsulae, however, became weaker than that of A. ovale, when we excluded one dense patch originating from irregular seed dispersion. These results, excluding the aggregated distribution observed in A. peninsulae, suggested a substantial contribution of clonal reproduction to the expansion of the local A. ovale population following intensive grazing by Sika deer., NORTHEAST FORESTRY UNIV
Journal of Forestry Research, Feb. 2020, [Reviewed]

Pre-pollination barriers between two sympatric Arisaema species in northern Shikoku Island, Japan
Tetsuya K. Matsumoto; Yuko Miyazaki; Masahiro Sueyoshi; Yoshihiro Senda; Kazuhiro Yamada; Muneto Hirobe, Lead, Premise The genus Arisaema (Araceae) has rapidly diversified in Japan, and multiple species often coexist in the field. Although Japanese Arisaema species hybridize from artificial crossing, hybrid individuals are rare in mixed populations; suggesting the presence of effective pre-pollination barriers. We examined the following reproductive barriers between A. sikokianum and A. tosaense: habitat, phenology, and pollinator isolations. Methods Habitat isolation was examined by interspecific comparisons of microhabitat conditions at a mixed site and of altitude at the sampling site of herbarium specimens. Phenological isolation was evaluated by comparing seasonal transition in apparent spathe condition and frequency of insect visitation. Pollinator isolation was examined by comparing floral visitor assemblages between the two Arisaema species. To avoid overestimation of pollinator isolation due to seasonal changes in insect assemblages, we also compared visitor assemblages between natural and late-flowering A. sikokianum, where the latter was experimentally introduced and blooming with a natural A. tosaense population. Results Microhabitat conditions and sampling elevations of herbarium specimens overlapped between the two Arisaema species. At the population level, A. sikokianum and A. tosaense flowered for 39 and 52 days, respectively, with 13 days overlap. Insect visitation in A. sikokianum decreased before the seasonal overlap. Floral visitor assemblages differed between the two Arisaema species, while the difference between natural and late-flowering A. sikokianum was less distinct. Conclusions Phenological and pollinator isolation contribute to reproductive isolation between the two Arisaema species and should enable the two species to coexist in this area., WILEY
American Journal of Botany, Nov. 2019, [Reviewed]

Stump sprout dynamics of Quercus serrata Thunb. and Q. acutissima Carruth. four years after cutting in an abandoned coppice forest in western Japan
Tai Tien Dinh; Chihiro Kajikawa; Yasuaki Akaji; Kazuhiro Yamada; Tetsuya K. Matsumoto; Takushi Makimoto; Naoko H. Miki; Muneto Hirobe; Keiji Sakamoto, The concern regarding the re-establishment of coppice forests has increased with respect to biodiversity conservation, bioenergy, and ecological services. To successfully restore the oak dominated coppices, understanding the factors affecting sprout regeneration is necessary because stump sprouts are the essential source of natural oak regeneration. In the present study, therefore, we sought to determine the stump sprout dynamics of the two widely distributed oaks in Japan, Quercus serrata and Q. acutissima, in relation to stump size, sprout characteristics, topographic factors, and canopy closure over a 4-year period following cutting in abandoned coppices. The study plot (40 x 90 m) was established in a coppice forest abandoned since the 1960s in western Japan. In winter 2013, canopy trees within and outside the plot were cut, then we collected the data of sprout origin position, sprout survival, sprout diameter, and length from 2014 to 2017. Four years after cutting, the proportion of surviving stumps decreased to 37% (n = 98) and 56% (n = 61) in Q. serrata and Q. acutissima, respectively. In both species, the Bayesian logistic mixed model showed that stump survival was not significantly affected by stump size and the examined environmental factors. The number of living sprouts per stump differed between Q. serrates (8.7 +/- 6.7) and Q. acutissima (5.1 +/- 4.6) after four years (P = 0.01). The number of sprouts per stump in both species tended to increase with stump diameter and was greater in convex area, but only significant for Q. acutissima. Dominant sprouts of Q. acutissima exhibited greater diameter and length than those of Q. saran, and the relative growth rate of sprouts in both species decreased with time after cutting. Dominant sprouts originating from a higher position on the stump grew better than those closer to the ground level. Sprout growth was negatively affected by sprout number per clump and positively affected by dead sprout number per stump, but only significant for Q. serrata. Light availability positively, although modestly, influenced sprout growth. Our data suggest that relying only on stump sprouts to restore the abandoned coppice stands dominated by the two species is insufficient because their stump survival rate was relatively low. Within the observed range of stump diameter, it may not be a factor responsible for the regeneration failure in the two species. Artificial thinning of small and suppressed sprouts may promote the growth of the remaining dominant sprouts., ELSEVIER SCIENCE BV
Forest Ecology and Management, Mar. 2019, [Reviewed]

New record of Scaphisoma taiwanum Löbl (Coleoptera, Staphylinidae, Scaphidiinae) from Shikoku, Japan.　　　　　　　　　　　　　　　
Yoshihiro Senda; Tetsuya K. Matsumoto
Elytra, New Series, Dec. 2018, [Reviewed]

〔Major achievements〕A Taxonomic Study of the Arisaema serratum Group (Araceae) in Northern Okayama Prefecture, Western Japan
Tetsuya K. Matsumoto; Shinya Sakuwa; Jin Murata, Lead, ツムラ
Journal of Japanese Botany, Aug. 2018, [Reviewed]

New Records of Arisaema angustatum and A. pseudoangustatum var. pseudoangustatum (Araceae) from Okayama Prefecture, Western Japan
Tetsuya K. Matsumoto; Shinya Sakuwa; Jin Murata, Lead, ツムラ
Journal of Japanese Botany, Apr. 2018, [Reviewed]

Sprouting capacity of Quercus serrata Thunb. and Quercus acutissima Carruth. after cutting canopy trees in an abandoned coppice forest
Tai Tien Dinh; Yasuaki Akaji; Tetsuya Matsumoto; Takumi Toribuchi; Takushi Makimoto; Muneto Hirobe; Keiji Sakamoto, Rejuvenation by sprouting is a possible solution to prevent abandoned coppice forests in Japan from outbreaks of oak wilt disease. Applying this approach requires examining the sprouting capacity of large-sized oak trees. Therefore, the present study investigated the effects of stump size, sprout characteristics (emerging time and origin position), and environmental factors (slope, convexity, soil moisture, soil net nitrogen mineralization rate (Net-NMR) and canopy closure) on sprout regeneration of the two widely distributed oaks in Japan, Quercus serrata and Quercus acutissima, in the first growing season after cutting. In November 2013, a study plot (40x90m) was set, and canopy trees within the plot and edge areas were cut. We recorded sprout emergence, sprout origin position, sprout survival, and length from May to October 2014. Our data indicated that both species (ca. 60years old) have not yet lost their ability of sprouting. In Q. acutissima, the sprouting probability increased with light availability and was higher in concave area, and its number of living sprouts was positively related to stump diameter. In Q. serrata, the number of living sprouts increased with light availability. Sprouts emerged earlier and/or originated from the lower part of stump exhibited a higher survival probability. Emerging time substantially influenced sprout growth pattern and its effect followed a similar tendency in both species. Our results evidence that the ability of sprouting and the number of living sprouts might not be reduced in large-sized trees, and the increasing of light availability could promote sprout regeneration., TAYLOR & FRANCIS LTD
Journal of Forest Research, 2018, [Reviewed]

Effects of Juniperus sabina L. and soil surface environmental conditions on stand structure of Artemisia ordosica Krasch. on fixed sand dune in semiarid area, China
MATSUMOTO Tetsuya; MIKI H. Naoko; HIROBE Muneto; ZHANG GuoSheng; WANG LinHe; YOSHIKAWA Ken, Lead, We investigated the effect of soil surface environmental conditions on the stand structure of Artemisia ordosica Krasch., which is a deciduous semi shrub and one of the revegetation plant in semiarid area, China. The effect of Juniperus sabina L., which has prostrate life-form and often distributed with A. ordosica was also considered. Individual density, position, size, existence of fruits, and soil surface conditions were measured. The results suggested that both species exclude with each other and the A. ordosica community on the fixed sand dune was influenced by the competition to get the resources with J. sabina rather than the nutrient conditions of soil surface., JAPANESE SOCIETY OF REVEGETATION TECHNOLOGY
Journal of the Japanese Society of Revegetation Technology, 2015, [Reviewed]

Reproductive system of Pinellia tripartita (Araceae)
尾上元哉; 松本哲也; 廣部宗; 宮崎祐子
日本生態学会大会講演要旨(Web), 2021

岡山県北部に分布する広義マムシグサを対象とした隠蔽種の探索
平松勅悦; 松本哲也; 柿嶋聡; 宮崎祐子; 末吉昌宏; 廣部宗
日本植物分類学会大会研究発表要旨集, 2021

Pre-pollination isolating barriers between two sympatric species, Arisaema minus and A. yamatense
松本哲也; 小林禧樹; 末吉昌宏; 宮崎祐子; 廣部宗
日本生態学会大会講演要旨(Web), 2020

テンナンショウ属5種の共存に対するキノコバエ類の種特異的訪花の寄与
松本哲也; 廣部宗; 末吉昌宏; 宮崎祐子
日本植物分類学会大会研究発表要旨集, 2020

岡山県版レッドデータブック2020　　　　　　　　　　　　　　　
岡山県野生動植物調査検討会, Contributor
岡山県環境文化部自然環境課, Mar. 2020

岡山県野生生物目録2019　　　　　　　　　　　　　　　
岡山県野生動植物調査検討会, Contributor
岡山県環境文化部自然環境課, Mar. 2019