研究者詳細 - 酒井　暁子

同一集団内における花の形質の多様性とその要因について、フクジュソウを材料に、①個体の持つ資源量の違い、②開花日の違いに着目して調べた。調査は福島県只見町黒谷川沿いの集団で行い、71個体84花を対象に、個体サイズ、花弁数、雄蕊数、胚珠数、３種類の花面積、雄適応度（雄しべ数×被訪花数）、雌適応度（成熟種子数）等を記録した。その結果、大きな個体ほど多くの雄蕊と胚珠を持つ大きな花を付けていた。花面積のうち、ディスプレイサイズは雄適応度を高める効果があり、花弁の重なりの面積は雌適応度と雄適応度の両方と相関が認められた。また、前期と後期のいずれかに１花のみを開花させた個体を対象に、個体サイズの影響を除いて比較した結果、前期開花群は雄蕊と胚珠を多く付けるが、被訪花数と稔実率は後期開花群で高かった。フクジュソウはごく少数の花を付けることから、適応度を上げるための形質の調節が個花レベルで行われることと、繁殖に投入し得る資源量や開花時期が、環境の違い等によって個体間で異なることが、花の形質の集団内多様性を引き起こしていると推察された。

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年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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.

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年 [査読有り]

CiNii Research

記述言語：その他外国語掲載種別：研究論文（学術雑誌）単著

ブナの葉形質に及ぼす地形の効果

後藤亮仁・近藤博史・酒井暁子

只見の自然只見町ブナセンター紀要 7 2 - 9 2019年4月 [査読有り]

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：只見町ブナセンター共著

環境への適応として、尾根と谷では葉の形質が異なること、また種間と種内では環境への応答性が必ずしも一致しないことが知られている。そこで本研究では、単一樹種内では地形上の位置によって葉の形質がどのように変化するかに着目し、尾根から谷に連続的に分布している只見地域のブナを材料として調査・解析を行なった。樹冠下層のブナ個葉の形質について、叶津、下福井、白沢(いずれも只見町)で様々なサイズの計 111 個体から各 6 枚の葉を採取して計測を行い、直径 30m から 1,010m まで評価範囲を順次変えたラプラシアンによる尾根-谷傾度上の位置との関係を一般化線形混合モデルで分析した。その結果、葉形質への影響は 30m ラプラシアンで最も顕著で、より尾根的な地点ほど、葉の面積・重量は小さく、薄く(SLA: Specific Leaf Area が大きい)、葉緑素濃度は小さい(SPAD 値が低い)ことが明らかとなった。葉サイズと SPAD 値の傾向は種間を対象とした先行研究と整合しているが SLA の傾向は一致しない。全体として SLA と SPAD 値は強い負の相関を示した。地際での土壌含水率および葉の採取位置での開空度によって評価した水・光環境は、葉形質とは無関係で地形とも対応しておらず、葉形質の地形傾度を生じる要因については不明である。

Spring leaf phenology of Fagus crenata in snowy region - differences relating to relative height of foliage between and within individuals

Shiho Nishizaka, Akiko Sakai

11th International Beech Symposium IUFRO, 18th – 21st September 2018, Viterbo, Italy 23 - 23 2018年9月 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

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.

その他リンク： https://exceptionaltrees.files.wordpress.com/2019/03/iufrobeech2018_proof.pdf

只見ユネスコエコパークが目指すもの―過疎・高齢化に直面する山間地域における自然環境と資源を活用した地域振興―

鈴木和次郎, 中野陽介, 酒井暁子

日本生態学会誌 66 ( 1 ) 135 - 146 2016年6月 [査読有り] [招待有り]

DOI

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：日本生態学会共著

只見生物圏保存地域での事例を分析し、ユネスコMAB計画の理念が地域に受入れられ本制度を地域振興に活用するに至った背景、プロセス、課題について具体的に示した。

その他リンク： https://www.jstage.jst.go.jp/article/seitai/66/1/66_135/_article/-char/ja/

ユネスコエコパークの評価と今後の運用に向けての提言―インターネット検索ヒット数を用いた制度間の比較分析から

酒井暁子

日本生態学会誌 66 ( 1 ) 165 - 172 2016年6月 [査読有り] [招待有り]

DOI

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：日本生態学会単著

数値データを用いた統計解析によって国内で運用されている他の関連制度との比較を行い、今後の制度運用について提言を行った。

その他リンク： https://www.jstage.jst.go.jp/article/seitai/66/1/66_165/_article/-char/ja/

Topographical patterns in the phylogenetic structure of temperate forests on steep mountainous terrain

Ryo Kitagawa, Makiko Mimura, Akira S. Mori, Akiko Sakai

AoB PLANTS 7 2015年11月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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.

その他リンク： https://academic.oup.com/aobpla/article/doi/10.1093/aobpla/plv134/1807856

Micro-landform structure and tree distribution in subalpine area of V-shaped valley, Minami-Alps, central Japan

KONDO Hirofumi, SAKAI Akiko

Geographical review of Japan series B 88 ( 1 ) 23 - 37 2015年8月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：日本地理学会共著

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.

その他リンク： https://www.jstage.jst.go.jp/article/geogrevjapanb/88/1/88_880101/_article

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年 [査読有り]

記述言語：日本語掲載種別：研究論文（大学，研究機関紀要）共著

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年 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ecological traits of mountain forest trees: adaptive tree architecture on steep slopes

Sadahira, M., Kitagawa, R. and Sakai, A.

EAFES（東アジア生態学連合）/ESJ Joint Meeting, Shiga 2012年

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

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年

記述言語：英語掲載種別：研究論文（その他学術会議資料等）単著

Estimation of forest structure in steep mountainous terrain using LIDER

Kitagawa, R., Kato, A., Mori, A. and Sakai, A.

EAFES（東アジア生態学連合）/ESJ Joint Meeting, Shiga 2012年

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

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年6月

記述言語：英語掲載種別：研究論文（研究会，シンポジウム資料等）共著

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年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Forest structure in a mountain catchment with steep terrain

Kitagawa, R. and Sakai, A.

95th Annual Meeting of Ecological Society of America,Pennsylvania 2010年8月

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

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年 [査読有り]

Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）単著

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年

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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年8月

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

Seed production in Cardiocrium cordatum: effects of nitrogen and dry mass availability of a plant

SAKAI, Satoki, FUJIOKA, Kohta

Canadian Journal of Botany 84 805 - 812 2006年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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)

SASA, Ayako and SAKAI, Satoki

American Journal of Botany 93 988 - 992 2006年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年8月

記述言語：英語掲載種別：研究論文（その他学術会議資料等）単著

Nature of size-number trade-off: test of the terminal-stream-limitation model for seed production of Cardiocrium Cordatum

SAKAI, Satoki

Oikos 108 105 - 114 2005年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年10月

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

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年7月

記述言語：英語掲載種別：研究論文（その他学術会議資料等）共著

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年 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Altitudinal variation in lifetime growth trajectory and reproductive schedule of a subalpine conifer Abies mariesii

MATSUI, Kiyoshi, KABEYA, Daisuke and SAKAI, Satoki

Evolutionary Ecology Research 5 671 - 689 2003年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Size-dependent ESS sex allocation in wind-pollinated cosexual plants: fecundity vs. stature effects

SAKAI, Satoki

Journal of Theoretical Biology 222 283 - 295 2003年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Resprouting ability of Quercus crispula seedlings depends on the vegetation cover of their microhabitats

KABEYA, Daisuke, MATSUI, Kiyoshi and SAKAI, Satoki

Journal of Plant Research 116 207 - 216 2003年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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年 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

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 … 全著者表示

東北森林科学会誌 8 67 - 74 2003年 [査読有り]

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Seedling establishment of deciduous trees in various topographic positions

NAGAMATSU, Dai, SEIWA, Kenji

Journal of Vegetation Science 13 35 - 44 2002年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

オオシラビソの繁殖戦略:標高による性投資比の違い

第４６回日本生態学会(大会講演要旨集) 201 1999年

記述言語：日本語掲載種別：研究論文（その他学術会議資料等）共著

コナラ稚樹の季節依存的シュート再生

第１１０回日本林学会(大会学術講演集) 855 1999年

記述言語：日本語掲載種別：研究論文（その他学術会議資料等）単著

Do sprouting tree species on erosion-prone sites carry large reserves of resources?

Sakai, S

VII International Congress of Ecology 367 1998年 [査読有り]

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）共著

A test the resource remobilization hypothesis : tree sprouting using carbohydrates from above-ground parts.

SAKAI, Satoki

Annals of Botany 82 213 - 216 1998年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Do sprouting tree species on erosion-prone sites carry large reserves of resources?

SAKAI, Satoki and AKIYAMA, Fumiaki

Annals of Botany 79 625 - 630 1997年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Why is there variation in mean seed size among plants within single populations? : Test of the fertilization efficiency hypothesis.

SAKAI, Satoki

American Journal of Botany 83 1454 - 1457 1996年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Flower size-dependent variation in seed size : Theory and a test.

SAKAI, Satoki

The American Naturalist 145 918 - 934 1995年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Adaptive significance of sprouting of Euptelea polyandra, a deciduous tree growing on steep slopes with shallow soil.

OHSAWA, Takeshi and OHSAWA, Masahiko

Journal of Plant Research 108 377 - 386 1995年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Topographical pattern of the forest vegetation on a river basin in a warm-temperate hilly region, central Japan.

OHSAWA, Masahiko

Ecological Research 9 269 - 280 1994年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Vegetation pattern and microtopography on a landslide scar of Mt Kiyosumi, central Japan.

OHSAWA, Masahiko

Ecological Research 8 47 - 56 1993年 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

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