Papers - SAKAI Akiko
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Xu, XD; Sakai, A
ENVIRONMENTAL AND SUSTAINABILITY INDICATORS 23 2024.9
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Nakamura Masahiro, Terada Chisato, Ito Kinya, Matsui Kazuaki, Niwa Shigeru, Ishihara Masae, Kenta T … Show more authors
Nakamura Masahiro, Terada Chisato, Ito Kinya, Matsui Kazuaki, Niwa Shigeru, Ishihara Masae, Kenta Tanaka, Yoshikawa Tetsuro, Kadoya Taku, Hiura Tsutom, Muraoka Hiroyuki, Ishida Ken, Agetsuma Naoki, Nakamura Ryosuke, Sakio Hitoshi, Takagi Masahiro, Mori Akira S., Kimura Megumi K., Kurokawa Hiroko, Enoki Tsutomu, Seino Tatsuyuki, Takashima Atsushi, Kobayashi Hajime, Matsumoto Kazuho, Takahashi Koichi, Tateno Ryunosuke, Yoshida Tomohiro, Nakaji Tatsur, Maki Masayuki, Kobayashi Kazutaka, Fukuzawa Karibu, Hoshizaki Kazuhiko, Ohta Kazuhide, Kobayashi Keito, Hasegawa Motohiro, Suzuki Satoshi N., Sakimoto Michinori, Kitagawa Yoichiro, Sakai Akiko, Kondo Hirofumi, Ichie Tomoaki, Kageyama Koji, Hieno Ayaka, Kato Shogo, Otani Tatsuya, Utsumi Yasuhiro, Kume Tomonori, Homma Kosuke, Kishimoto Koju, Masaka Kazuhiko, Watanabe Kenta, Toda Motomu, Nagamatsu Dai, Miyazaki Yuko, Yamashita Tamon, Tokuchi Naoko Hide authors
ECOLOGICAL RESEARCH 37 ( 3 ) 432 - 445 2022.2
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Kitagawa Ryo, Mimura Makiko, Mori Akira S., Sakai Akiko
ECOLOGICAL RESEARCH 35 ( 4 ) 613 - 624 2020.7
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Intra-population variation in floral traits of Adonis ramosa (Ranunculaceae)
Nanami KONDO, Hirofumi KONDO, and Akiko SAKAI
Nature of Tadami, Bulletin of the Tadami Beech Center 8 (in press) 2020 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
Variation in flower traits within a population and its factors were investigated using Adonis ramosa, focusing on (1) differences in the amount of resources possessed by individuals and (2) differences in flowering days. The survey was conducted in a population located in Tadami Town. Plant size, number of petals, number of stamens, number of ovules,three kinds of flower area size, male fitness (number of stamens x freqency of insect visit), and female fitness (number of mature seeds) were recorded for 84 flowers of 71 individuals. (1) The bigger individuals had larger flowers with more stamens and ovules. Of the flower area sizes, the display size was related to the male fitness and the size of petals overlap area was related to the male and female fitness. (2) As a result of comparison of individuals in which only one flower was produced in either the first or second half of the flowering period of the population, excluding the effect of individual size, the first flowering group had many stamens and ovules, but the number of insect visits and the fertility rate were higher in the late flowering group. Since A. ramosa has only a few flowers, the flower traits are adjusted at the individual flower level to increase fitness. In addition, the flowering day and the amount of resources that can be allocated to reproduction differ among individuals due to differences in the environment and other factors. These factors may contribute the intra-population variation in flower traits, which observed in the A. ramosa population.
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Phylogenetic singnal in the topographic niche of trees: Current and historical significance of habitat structure on the species arrangement pattern within East Asian rugged forests
KITAGAWA Ryo, MIMURA Makiko, MORI Akira S., and SAKAI Akiko
Ecological Research (in press) 2020 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Topography often promotes habitat heterogeneity and is a major factor in fine-grained changes in vegetation. Especially in temperate mountainous regions of East Asia, the distribution of tree species is largely explained by topographic niche differentiation. Because species niche is at least partially a historical product through the evolution of functional traits, phylogenetic signals are expected in the topographic arrangement pattern of species, although this has not been fully investigated. Thus, we examined common temperate trees in a 306 ha watershed on Mt Tanzawa, central Japan. The topographic niche position of each species was explained with two principle component analysis (PCA) axes, which aligned with the topographic structure of the watershed. High scores on PC1 reflected lower elevations, steeper slopes, and nearby valleys. Higher scores on PC2 indicated thicker soil, more south-facing slopes, slighter slope inclinations, and nearby valleys. The former indicated the species were aligned on a habitat gradient of land-surface instability, for which the gradient is typical under the current geological conditions. The latter indicated that a niche axis for resource availability relating to water, nutrients, and light or heat existed. A phylogenetic signal, identified by Pagel’s λ and the Mantel test, was detected for PC2 scores. However, the species arrangement along PC1 was independent of phylogeny. Our results suggested that the topographic niche of tree species in this area is caused by both relatively recently derived traits regarding adaptation to unstable land surfaces and conservative traits derived through plant evolution.
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フクジュソウの花形質の集団内変異とその要因
酒井 暁子
只見の自然 只見町ブナセンター紀要 8 2 - 12 2020 [Reviewed]
Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Single Work
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Changing leaf traits with topographic position in Fagus crenate
Akihito GOTO, Hirofumi KONDO, Akiko SAKAI
Nature of Tadami; Bulletin of the Tadami Beech Center 7 2 - 9 2019.4 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Tadami Beech Center Joint Work
While leaf traits are known to adaptively differentiate depending on topographic position, such as ridge or valley, intraspecific patterns may be different from interspecific tendencies that have been well studied. In temperate snowy areas of Japan, Fagus crenata is dominant in a wide range of habitats ranging from ridges to valleys, and serves as a fitting material for examining topographical intraspecific leaf changes. We sampled six leaves from the lowest parts of tree crowns from 111 F. crenata of various sizes in Tadami town. Soil water content near stem bases and canopy openness at the leaf sampling points were measured as environmental indices. Topographical leaf changes of F. crenata were detected statistically, when a tree position on the ridge-valley gradient was evaluated by 30 m Laplacian. The results showed that the closer to the ridge, the smaller the leaf area and leaf dry weight, the higher the specific leaf area (SLA), and the smaller the SPAD value (an indicator of chlorophyll content based on area). There was a strong negative correlation between SLA and SPAD value. The detected trends in leaf sizes and SPAD value agreed with common tendencies known as interspecies pattern, but not for SLA tendency. Soil water content and light condition were independent from topographic position, and factors affecting topographic trends in the leaf traits were unclear.
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Shiho Nishizaka, Akiko Sakai
11th International Beech Symposium IUFRO, 18th – 21st September 2018, Viterbo, Italy 23 - 23 2018.9 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
The timing of spring leaf emergence is important for the tree carbon gaining strategy in temperate deciduous forests. Leaf phenology of co-occurring trees is known to vary even within a same species, including size-dependent changes (Augspurger & Bartlett, 2003). However, few studies mention variations within individual trees, although physiological and morphological adaptive changes of leaves in the crowns are noticed. In this study, we examined the spring leaf phenology of Fagus crenata, focusing on relative heights of shoots in individual crowns and relative tree heights in a forest.
Data was collected in Tadami Town of Fukushima, a typical snowy F. crenata forested area in northern Japan. Leaf flashing dates were detected in an old-growth beech forest (Site 1) and a secondary beech forest (Site 2) in 2017, for the upper and lower shoots of 154 trees of various heights. Forest structures and shoot light conditions were also evaluated.
In Site 1, flashing occurred later with increasing tree height, but independently of the relative heights in crowns. In Site 2, flashing occurred earlier on higher trees and on higher shoots in the crowns. This tree height effect in Site 2 was noticeable for trees < 5.5 m.
The two patterns were related to local light conditions, resulting from the community structure and snowmelt timing. In Site 1, phenology is accelerated in short trees for effective light acquisition under canopy although it did not explain the lack of the pattern in crowns. While, strong vertical gradient of irradiance in Site 2 may cause short trees and lower shoots to have more shade-leaves and to avoid direct light. Delayed snowmelt also contributes to the late flashing of the lower foliage in Site 2. We suggest that both strategic and passive modifications promote the complex pattern of phenology in F. crenata.Other Link： https://exceptionaltrees.files.wordpress.com/2019/03/iufrobeech2018_proof.pdf
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Wajiro Suzuki, Yosuke Nakano, Akiko Sakai
Japanese Journal of Ecology 66 ( 1 ) 135 - 146 2016.6 [Reviewed] [Invited]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Ecological Society of Japan Joint Work
We analyzed cases in the Tadami Biosphere Reserve, and specifically explained the background, process, and issues that led to the regional acceptance of the principles of the UNESCO MAB program and the use of this system for regional development.
Other Link： https://www.jstage.jst.go.jp/article/seitai/66/1/66_135/_article/-char/ja/
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SAKAI Akiko
Japanese Journal of Ecology 66 ( 1 ) 165 - 172 2016.6 [Reviewed] [Invited]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Ecological Society of Japan Single Work
I made comparisons with other related systems operating in Japan by statistical analysis using numerical data, and made recommendations for future system management.
Other Link： https://www.jstage.jst.go.jp/article/seitai/66/1/66_165/_article/-char/ja/
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Ryo Kitagawa, Makiko Mimura, Akira S. Mori, Akiko Sakai
AoB PLANTS 7 2015.11 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
In rugged terrain subject to active geomorphological processes, the species composition of forest communities changes along topographic gradients over short distances. However, the phylogenetic structure of forests on rugged terrain has rarely been examined. Understanding such structures provides insight into community assembly rules dependent on local environmental conditions. To this end, we tested the topographic trends of measurements of phylogenetic community structure [net relatedness index (NRI) and nearest taxon index] in a catchment covered by temperate forests with complex relief in Japan. We found that phylogenetic structure changed from over-dispersion to clustering with increasing slope inclination, change of slope aspect from south to north and decreasing soil depth. This result suggested that environmental filtering tended to restrict community composition at relatively stressful sites, whereas species interaction functioned more strongly at relatively stress-free sites. Relatively stressful sites were characterized by early-successional species that tended to assemble in certain phylogenetic clades, whereas highly competitive late-successional species associated with lower NRI at relatively stress-free sites. However, despite this significant topographic tendency, phylogenetic community structures were not statistically different from random assumptions in most plots. This obscuration of the phylogenetic structures at the plot level could be interpreted as species adapting to disturbances because they were abundant in this catchment. Accordingly, we suggest that a stochastic process was also important for this community at the plot level, although biotic and abiotic environmental filtering controlled the vegetation structure in the catchment, where disturbances occur frequently because of geomorphological mountain denudation processes owing to active crustal movements and abundant rainfall.
Other Link： https://academic.oup.com/aobpla/article/doi/10.1093/aobpla/plv134/1807856
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KONDO Hirofumi, SAKAI Akiko
Geographical review of Japan series B 88 ( 1 ) 23 - 37 2015.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：日本地理学会 Joint Work
have been focused on in many regions; however, subalpine riparian forests have hardly been examined in Japan. We investigated the micro-landform structure and spatial pattern of tree distributions in a V-shaped valley at 2,000–2,200 m a.s.l. in the Minami Alps, central Japan, using a 0.42 ha core-plot and 16 belt-transects set in a headwater area of Norogawa River. As riparian topographical components, channel, floodplain, scarp of terrace and terrace were detected, which were arranged roughly from lower to higher elevations from streams, as well as mountain slope as a micro-landform unit outside the riparian area. Single-layered floodplain, conspicuous terrace segments and the probable lack of a lower sideslope were identified as features that differ from those found in previous studies on other climatic/large-scale geomorphological conditions. The distribution of deciduous species was biased to lower elevations, with the representatives Salix cardiophylla var. urbaniana on floodplains and Alnus matsumurae on scarps of terraces. These micro-landform units were recognized as a riparian zone in terms of vegetation. Meanwhile, climatic climax evergreen conifers, mainly Abies veitchii, Tsuga diversifolia and A. mariesii, dominated not only mountain slopes but also terraces, indicating that terraces are upland areas in terms of their vegetation. A much smaller area, low species diversity and an assumed direct succession from pioneer to climax phase, because of poor long-lived riparian species capable of forming a mid- or late successional phase, were properties differing from those found in previous studies on other climatic/geomorphological conditions.
Other Link： https://www.jstage.jst.go.jp/article/geogrevjapanb/88/1/88_880101/_article
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只見町の５流域における植生分布に地形と積雪深が及ぼす影響
斉藤真人・酒井暁子
只見町ブナセンター紀要 2014 [Reviewed]
Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Joint Work
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Spatial pattern of forest structure mediated by topography in a steep mountain basin in west Tanzawa, Japan
Kitagawa, R.,Kondo, H. and Sakai, A
Journal of Forest Research 19 205 - 214 2014 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Ecological traits of mountain forest trees: adaptive tree architecture on steep slopes
Sadahira, M., Kitagawa, R. and Sakai, A.
2012
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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Change of phylogenetic community structure along topographical gradients in a warm temperate forest in steep mountanious region
Kitagawa, R., Mimura, M., Mori, A and Sakai, A.
97th Annual Meeting of Ecological Society of America 2012
Language：English Publishing type：Research paper (other science council materials etc.) Single Work
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Estimation of forest structure in steep mountainous terrain using LIDER
Kitagawa, R., Kato, A., Mori, A. and Sakai, A.
2012
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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Distribution of tree species in relation to micro topography in a sub-alpine riparian area, central Japan
Kondo, H. and Sakai, A.
54th Symposium of the International Association of Vegetation Science, Lyon 20 - 24 2011.6
Language：English Publishing type：Research paper (research society, symposium materials, etc.) Joint Work
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How to reconcile conservation with sustainable use? an idea from UNESCO's Man and the Biosphere program.
Matsuda, H. and Sakai, A.
Ogasawara Research 37 65 - 77 2011 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Forest structure in a mountain catchment with steep terrain
Kitagawa, R. and Sakai, A.
95th Annual Meeting of Ecological Society of America,Pennsylvania 2010.8
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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Ecological risks in anthropogenic disturbance of nitrogen cycles in natural terrestrial ecosystems
Fujimaki, R., Sakai, A. and Kaneko, N.
Ecological Research 24 955 - 964 2009 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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木曽川干潮域における絶滅危惧植物タコノアシの分布特性と生育適地
比嘉基紀・師井茂倫・酒井暁子・大野啓一
保全生態学研究 13 207 - 217 2008
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Effects of nitrogen excess through rainfalls on growth and competition status of woody seedlings in Mt Tanzawa, near Tokyo, and mitigation of the effects using wood-chips
Sakai, A., Fujimaki, R. and Kaneko, N.
ESA/SER Joint Meeting (Annual Meeting of Ecological Society of America and Society for Ecological Restoration International), San Jose, California 2007.8
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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Seed production in Cardiocrium cordatum: effects of nitrogen and dry mass availability of a plant
Canadian Journal of Botany 84 805 - 812 2006 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Do sexual dimorphisms in reproductive allocation and new shoot biomass increase with an increase of altitude? A case of the shrub willow Salix reinii (Salicaceae)
American Journal of Botany 93 988 - 992 2006 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Resource dynamics for shoot recovery during the growing season in temperate tree seedlings
Sakai, A.
The joint meeting of 90th Annual meeting of the Ecological Society of America and IX International Congress of Ecology, Montreal 2005.8
Language：English Publishing type：Research paper (other science council materials etc.) Single Work
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Nature of size-number trade-off: test of the terminal-stream-limitation model for seed production of Cardiocrium Cordatum
Oikos 108 105 - 114 2005 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Changes in Tree Growth Rate during Past 100 Years in Sub-Alpine Areas, Northeast Japan
Sakai, A., Fukuda, T. and Sakai, S.
The 6th International Symposium on Plant Responses to Air Pollution and Global Changes from Molecular Biology to Plant Production and Ecosystems, Tsukuba 269 2004.10
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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Role of birds in nutrient cycles in suburban landscape, Japan
Fujita, M., Koike, F. and Sakai, A.
89th Annual Meeting of the Ecological Society of America, Oregon 2004.7
Language：English Publishing type：Research paper (other science council materials etc.) Joint Work
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都市域孤立林における偏向遷移
戸島久和（学内）・小池文人（学内）・藤原一繪（学内）
日本生態学会誌 54 133 - 141 2004 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Altitudinal variation in lifetime growth trajectory and reproductive schedule of a subalpine conifer Abies mariesii
Evolutionary Ecology Research 5 671 - 689 2003 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Size-dependent ESS sex allocation in wind-pollinated cosexual plants: fecundity vs. stature effects
Journal of Theoretical Biology 222 283 - 295 2003 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Resprouting ability of Quercus crispula seedlings depends on the vegetation cover of their microhabitats
Journal of Plant Research 116 207 - 216 2003 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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東北地方のブナ天然更新施業地の現状と展望―二つの事例と生態プロセス―特集：天然林施業に貢献する生態学-
正木隆・杉田久志・金指達郎・長池卓男・太田敬之・櫃間岳・新井伸昌・市栄智明・上迫正人・神林友広・畑田彩・松井淳・中静透
日本林学会誌 85 259 - 264 2003 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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白神山地における異なった構造をもつブナ林の動態モニタリング
中静 透・斉藤宗勝・松井 淳・蒔田明史・神林友広・正木 隆・長池卓男・杉田久志・金指達郎・関剛・太田敬之・櫃間 岳・八木貴信・橋本 徹・壁谷大介・高田克彦・星崎和彦・丑丸敦史・阿部みどり・大場信太郎 … Show more authors
中静 透・斉藤宗勝・松井 淳・蒔田明史・神林友広・正木 隆・長池卓男・杉田久志・金指達郎・関剛・太田敬之・櫃間 岳・八木貴信・橋本 徹・壁谷大介・高田克彦・星崎和彦・丑丸敦史・阿部みどり・大場信太郎・福田貴文・新井伸昌・上迫正人・田中健太・市栄智明・鈴木まほろ・乾 陽子・中川弥智子・黒川紘子・藤森直美・鮫島弘光・畑田 彩・堀 真人・沢田信一 Hide authors
東北森林科学会誌 8 67 - 74 2003 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Seedling establishment of deciduous trees in various topographic positions
Journal of Vegetation Science 13 35 - 44 2002 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Reproductive strategy of Abies mariesii : altitudinal trends in resource allocation to female cones and male flowers.
201 1999
Language：Japanese Publishing type：Research paper (other science council materials etc.) Joint Work
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Shoot recovering strategy in Quercus serrata seedlings.
855 1999
Language：Japanese Publishing type：Research paper (other science council materials etc.) Single Work
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Do sprouting tree species on erosion-prone sites carry large reserves of resources?
VII International Congress of Ecology 367 1998 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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A test the resource remobilization hypothesis : tree sprouting using carbohydrates from above-ground parts.
Annals of Botany 82 213 - 216 1998 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Do sprouting tree species on erosion-prone sites carry large reserves of resources?
Annals of Botany 79 625 - 630 1997 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Why is there variation in mean seed size among plants within single populations? : Test of the fertilization efficiency hypothesis.
American Journal of Botany 83 1454 - 1457 1996 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Flower size-dependent variation in seed size : Theory and a test.
The American Naturalist 145 918 - 934 1995 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Adaptive significance of sprouting of Euptelea polyandra, a deciduous tree growing on steep slopes with shallow soil.
Journal of Plant Research 108 377 - 386 1995 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Topographical pattern of the forest vegetation on a river basin in a warm-temperate hilly region, central Japan.
Ecological Research 9 269 - 280 1994 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Vegetation pattern and microtopography on a landslide scar of Mt Kiyosumi, central Japan.
Ecological Research 8 47 - 56 1993 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work