Ida Takashi
| Faculty Division of Natural Sciences Research Group of Biological Sciences | Associate Professor |
Last Updated :2025/06/13
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Name (Japanese)
IdaName (Kana)
Takashi Y
Professional Memberships
■Ⅱ．研究活動実績
Published Papers
- PLOS ONE, Public Library of Science (PLoS), Impacts of the novel coronavirus SARS-CoV-2 on wildlife behaviour via human activities, Haruka Uehara; Wakana Nishiyama; Shirow Tatsuzawa; Keiji Wada; Takashi Y. Ida; Yoichi Yusa, Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused the pandemic of the coronavirus disease 2019 (COVID-19), resulting in a global lockdown in 2020. This stagnation in human activities (‘anthropause’) has been reported to affect the behaviour of wildlife in various ways. The sika deer Cervus nippon in Nara Park, central Japan, has had a unique relationship with humans, especially tourists, in which the deer bow to receive food and sometimes attack if they do not receive it. We investigated how a decrease and subsequent increase in the number of tourists visiting Nara Park affects the number of deer observed in the park and their behaviour (bows and attacks against humans). Compared with the pre-pandemic years, the number of deer in the study site decreased from an average of 167 deer in 2019 to 65 (39%) in 2020 during the pandemic period. Likewise, the number of deer bows decreased from 10.2 per deer in 2016–2017 to 6.4 (62%) in 2020–2021, whereas the proportion of deer showing aggressive behaviour did not change significantly. Moreover, the monthly numbers of deer and their bows both corresponded with the fluctuation in the number of tourists during the pandemic period of 2020 and 2021, whereas the number of attacks did not. Thus, the anthropause caused by the coronavirus altered the habitat use and behaviour of deer that have continuous interactions with humans., 16 May 2023, 18, 5, e0285893, e0285893, Scientific journal, 10.1371/journal.pone.0285893
- Refereed, Botany, Canadian Science Publishing, Seasonal variation in air temperature drives reproductive phenology of entomophilous plants in a cool-temperate mire community, Takashi Y. Ida; Gaku Kudo, Phenological responses of plants to temperature dynamics are receiving attention due to the ongoing challenge with climate change. Most previous phenological studies have focused on flowering phenology rather than fruiting phenology. However, at mid-latitudes, the air temperature periodically changes during the growing period of plants. Hence, cool temperatures early and late in the growing period may affect reproductive success through pollination and fruit-development processes. To evaluate the linkages between reproductive phenology and success, we compared the phenologies, photosynthetic capacities, and fruit-set rates among 25 species within a cool-temperate community in northern Japan. The ambient temperature during the flowering periods of individual species increased with delays in flowering-onset time, whereas the ambient temperature during fruit-development periods was highest for species which bloomed in July. Fruit-set success among species was positively correlated with the ambient temperatures during the reproductive periods and with the photosynthetic capacity. Fruit production of early blooming species was limited by cool temperatures during the flowering period, presumably because of low pollinator activity, whereas that of late-blooming species was limited by cool temperatures during the fruit-development period because of slow fruit-development (i.e., sink limitation). Thus, limiting factors of fruit production varied depending on the flowering phenology of individual species within a community., Jul. 2021, 99, 7, 433, 447, Scientific journal, 10.1139/cjb-2021-0021
- Refereed, Oecologia, Adaptive significance of light and food for a kleptoplastic sea slug: implications for photosynthesis., Hiromi Shiroyama; Sayaka Mitoh; Takashi Y Ida; Yoichi Yusa, Sacoglossan sea slugs can 'steal' chloroplasts from their algal food and use them for photosynthesis (kleptoplasty). Although it has been shown that light has positive effects on survival and body size retention of some sacoglossans likely through photosynthesis, it is unknown whether light affects their fitness components such as number of offspring or offspring size. Moreover, whether the effects of light extend over the sacoglossans' lifetime has been unexplored. To assess such long-term effects of light intensity and food availability on fitness components, we conducted a 15.9-week laboratory experiment using Elysia atroviridis under a combination of two light intensities (low or high) and two food conditions (with or without food). The total number of eggs laid was greater in the presence of both strong light and food than in other conditions, suggesting positive effects of both light intensity and food availability. The shell height at hatch was also largest in the presence of strong light and food. Larval rearing experiments showed that the size difference at hatch between conditions corresponded to a 1.19-1.93 days growth and 7.9-18.1% survival increase. Thus, positive effects of light and food on the fitness components extend over the lifetime of E. atroviridis., 16 Oct. 2020, Scientific journal, True, 10.1007/s00442-020-04779-6
- Refereed, PLANT ECOLOGY, Multi-cycle synchronous protandry in raceme-like inflorescences of a bumblebee-pollinated herbAconitum grossedentatum, Takashi Y. Ida; Erina Minato, Oct. 2020, 221, 10, 965, 978, Scientific journal, 10.1007/s11258-020-01054-9
- Refereed, FUNCTIONAL ECOLOGY, Intraspecific neighbourhood effect: Population-level consequence of aggregation of highly defended plants, Momoka Tamura; Takayuki Ohgushi; Takashi Y. Ida, Mar. 2020, 34, 3, 597, 605, Scientific journal, 10.1111/1365-2435.13515
- Refereed, ECOLOGY AND EVOLUTION, Defensive chemicals of neighboring plants limit visits of herbivorous insects: Associational resistance within a plant population, Takashi Y. Ida; Kojiro Takanashi; Momoka Tamura; Rika Ozawa; Yoshitaka Nakashima; Takayuki Ohgushi, Dec. 2018, 8, 24, 12981, 12990, Scientific journal, 10.1002/ece3.4750
- Refereed, ECOLOGICAL ENTOMOLOGY, Community-wide impacts of early season herbivory on flower visitors on tall goldenrod, Mito Ikemoto; Takashi Y. Ida; Shunsuke Utsumi; Takayuki Ohgushi, Apr. 2017, 42, 2, 164, 172, Scientific journal, 10.1111/een.12372
- Refereed, ECOLOGY, Roles of the seasonal dynamics of ecosystem components in fluctuating indirect interactions on a rocky shore, Yoko Wada; Keiji Iwasaki; Takashi Y. Ida; Yoichi Yusa, Apr. 2017, 98, 4, 1093, 1103, Scientific journal, 10.1002/ecy.1743
- Refereed, BIOCONTROL, Field evaluation of synthetic aphid sex pheromone in enhancing suppression of aphid abundance by their natural enemies, Yoshitaka Nakashima; Takashi Y. Ida; Wilf Powell; John A. Pickett; Michael A. Birkett; Hisatomo Taki; Junji Takabayashi, Oct. 2016, 61, 5, 485, 496, Scientific journal, 10.1007/s10526-016-9734-3
- Refereed, JOURNAL OF ECOLOGY, The consequences of demand-driven seed provisioning for sexual differences in reproductive investment in Thalictrum occidentale (Ranunculaceae), Takashi Y. Ida; Lawrence D. Harder; Gaku Kudo, Jan. 2015, 103, 1, 269, 280, Scientific journal, 10.1111/1365-2745.12330
- Refereed, ALPINE BOTANY, Heating effect by perianth retention on developing achenes and implications for seed production in the alpine herb Ranunculus glacialis, Takashi Y. Ida; Orjan Totland, Apr. 2014, 124, 1, 37, 47, Scientific journal, 10.1007/s00035-014-0129-8
- Refereed, ECOLOGY, Early onset of spring increases the phenological mismatch between plants and pollinators, Gaku Kudo; Takashi Y. Ida, Oct. 2013, 94, 10, 2311, 2320, Scientific journal, 10.1890/12-2003.1
- Refereed, PLANT ECOLOGY, Photosynthetic compensation by the reproductive structures in the spring ephemeral Gagea lutea, Ninuola Sunmonu; Takashi Y. Ida; Gaku Kudo, Feb. 2013, 214, 2, 175, 188, Scientific journal, 10.1007/s11258-012-0157-7
- Refereed, ECOLOGY, Demand-driven resource investment in annual seed production by a perennial angiosperm precludes resource limitation, Takashi Y. Ida; Lawrence D. Harder; Gaku Kudo, Jan. 2013, 94, 1, 51, 61, Scientific journal, 10.1890/12-0619.1
- Refereed, ANNALS OF BOTANY, Effects of defoliation and shading on the physiological cost of reproduction in silky locoweed Oxytropis sericea, Takashi Y. Ida; Lawrence D. Harder; Gaku Kudo, Jan. 2012, 109, 1, 237, 246, Scientific journal, 10.1093/aob/mcr273
- Refereed, PLANT ECOLOGY, Seasonal patterns of carbon assimilation and allocation of a summer-green forest herb, Parasenecio auriculata (Senecioneae; Asteraceae), Takashi Y. Ida; Gaku Kudo, Sep. 2010, 210, 1, 181, 193, Scientific journal, 10.1007/s11258-010-9748-3
- Refereed, EVOLUTIONARY ECOLOGY, Modification of bumblebee behavior by floral color change and implications for pollen transfer in Weigela middendorffiana, Takashi Y. Ida; Gaku Kudo, Jul. 2010, 24, 4, 671, 684, Scientific journal, 10.1007/s10682-009-9324-2
- Refereed, FUNCTIONAL ECOLOGY, Carbon source for reproduction in a spring ephemeral herb, Corydalis ambigua (Papaveraceae), Gaku Kudo; Takashi Y. Ida, Feb. 2010, 24, 1, 62, 69, Scientific journal, 10.1111/j.1365-2435.2009.01601.x
- Refereed, JOURNAL OF PLANT RESEARCH, Comparison of light harvesting and resource allocation strategies between two rhizomatous herbaceous species inhabiting deciduous forests, Takashi Y. Ida; Gaku Kudo, Mar. 2009, 122, 2, 171, 181, Scientific journal, 10.1007/s10265-008-0212-6
- Refereed, ANNALS OF BOTANY, Timing of canopy closure influences carbon translocation and seed production of an understorey herb, Trillium apetalon (Trilliaceae), Takashi Y. Ida; Gaku Kudo, Feb. 2008, 101, 3, 435, 446, Scientific journal, 10.1093/aob/mcm296
- Refereed, ECOLOGY, Linkages between phenology, pollination, photosynthesis, and reproduction in deciduous forest understory plants, Gaku Kudo; Takashi Y. Ida; Tomokazu Tani, Feb. 2008, 89, 2, 321, 331, Scientific journal, 10.1890/06-2131.1
- Refereed, PLANT SPECIES BIOLOGY, Floral sex allocation in a hermaphrodite herb with 1-day flowers, Hosta rectifolia (Liliaceae), Guo-Xing Cao; Gaku Kudo; Takashi Y. Ida, Dec. 2007, 22, 3, 191, 196, Scientific journal, 10.1111/j.1442-1984.2007.00191.x
- Refereed, OECOLOGIA, A test of the effect of floral color change on pollination effectiveness using artificial inflorescences visited by bumblebees, Gaku Kudo; Hiroshi S. Ishii; Yuimi Hirabayashi; Takashi Y. Ida, Nov. 2007, 154, 1, 119, 128, Scientific journal, 10.1007/s00442-007-0820-1
- Refereed, AMERICAN JOURNAL OF BOTANY, Floral color change in Weigela middendorffiana (Caprifoliaceae): reduction of geitonogamous pollination by bumble bees, TY Ida; G Kudo, Dec. 2003, 90, 12, 1751, 1757, Scientific journal, 10.3732/ajb.90.12.1751
- Refereed, 16 May 2023, 18, e0285893, https://doi.org/10.1371/journal.pone.0285893
- Refereed, 02 July, 99, 7, 433, 447, 10.1139/cjb-2021-0021
MISC
Presentations
Awards
Research Projects
- 基盤研究(C), 01 Apr. 2019 - 31 Mar. 2022, 19K06854, 送粉共生系における毒性花蜜の進化生態学的意義を探る, 井田 崇; 高梨 功次郎, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 4420000, 3400000, 1020000, 本研究は送粉共生系における有毒花粉や有毒花蜜の重要性と，それが植物の繁殖成功にフィードバック効果の解明を目的とした．トリカブトはシカも忌避するほどアルカロイド（毒）をもつ植物である．この植物や送粉者に含まれる毒の定量とともに，植物形質に対する送粉者行動の応答，繁殖成功を綿密に調査した．また植物の空間分布を記録し，MIG-seq法により植物個体の遺伝構造を明らかにし関連性を解析した．
毒の分布について：個体内分布は一様でなく花蜜には毒が含まれず，花粉には葉と同等の毒が含まれていた．個体間分布に強い正の空間相関がみられた一方で，ジェノタイプ間の違いはなかった．送粉生態系において毒性花粉が作用している可能性や局所的な資源環境が毒量や成長量を制限していることが示唆される．
送粉者への直接的・間接的な効果について：送粉者マルハナバチの訪花行動の観察により，葉や花粉の毒量は，花序への訪問頻度にも，花序内やパッチ内の行動に影響しなかった．ハチが持つ花粉団子を定量するとトリカブトの毒が含まれており，確実に花粉を利用していた．花蜜に毒が含まれないことから，直接的に採餌するハチに影響しないことは予想されたが，同時に花粉も利用していた．毒性花粉による長期的なハチへの影響を評価するため，経時的にハチのサンプリングを実施した．植物の繁殖形質と毒量に連関がみられなかったため，毒生産による間接的に影響する可能性も否定された．また，空間的に毒量が多いパッチでは花粉食昆虫が少なかったため，毒性花粉は正当でない訪花者の忌避に寄与しているかもしれない．
以上より，一旦高くなった毒レベルは大型動物への防御適応であり，無毒な花蜜を作ることで，毒による瞬時の送粉生態系に与える効果は限定的である．現時点では，毒による正当でない訪花者を排除する機能の重要性が示唆されるが，送粉者が毒性花粉を利用するなど明らかでない部分もある．, kaken - Grant-in-Aid for Scientific Research (C), 01 Apr. 2017 - 31 Mar. 2020, 17K08182, Development of forecasting models and risk mapping methods for insect pest management, Nakashima Yoshitaka, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Kyoto University, 4810000, 3700000, 1110000, Development of forecasting models for insect pest management is an important part of integrated pest management systems. We developed the models and risk mapping methods for insect pest management of paddy fields, using Geographic Information System and statistical modeling., kaken
- Jul. 2013 - Feb. 2014, Principal investigator, 植物の繁殖成功における花粉制限と資源制限の再評価, 日本学術振興会 国際交流事業 二国間交流事業, 研究者交流（特定国派遣研究者）
- Jul. 2011 - Jun. 2013, Principal investigator, 虫媒花植物の花粉制限と資源利用戦略の季節変動と群集間比較, 日本学術振興会 人材育成事業, 海外特別研究員, カルガリー大学, rm:awards
- Jul. 2010 - Jun. 2011, Principal investigator, No specific name, Government of Canada, Canadian Post-Doctoral Research Fellowship, University of Calgary
- 特別研究員奨励費, 2006 - 2007, 06J04379, 虫媒花植物における花粉の輸送様式の多様性と交配様式の関係について, 井田 崇, 日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 北海道大学, 1900000, 1900000, 本研究は,陸域生態系において多様な進化を遂げている維管束植物の繁殖システムと送粉共生系に着目し,花粉媒介昆虫の行動に関連した植物の繁殖戦略形成プロセスの解明と送粉共生系の環境変動に対する感受性について,植物と花粉媒介昆虫の相互作用の観点から明らかすることを目的とした.北海道の落葉広葉樹林下に生育する林床植物を対象とし,開花フェノロジー,訪問する昆虫種や訪問頻度,種子生産について林床植物群集全体レベルで調査を行った.林床植物の繁殖特性・光合成特性には,季節ごとに3つのタイプがみられた.1「春植物」は,林冠閉鎖までの短期間で生産と繁殖を終える.2「初夏咲き植物」は,光が減衰する初夏に開花し,暗い環境で果実生産を行う.3「夏咲き植物」は,開花と果実生産の両方を林冠閉鎖後の暗い環境で行う.繁殖成功(果実数/花数)は,春植物と夏咲き植物で高く,初夏咲き植物で低い.このように,光環境や同化産物の季節変化は植物の繁殖成功を決定づける.落葉広葉樹林下では,林冠木の展葉により光環境が劇的に減少する.春植物は春先の明るい期間のみを,夏咲き植物は夏の暗い期間を使うことにより,安定した光資源環境において生育する.一方,初夏咲き植物では生育期間中に光が減少する.資源環境の変動は植物に対して強い選択庄となる.初夏咲き植物では資源不足が繁殖成功を制限している.絶対的な光資源量は違うが,春植物と夏咲き植物では,潜在的な繁殖能力が高い.これらの安定した資源環境に生育する植物の繁殖成功を規定するのは,資源制限ではなく,花粉制限であった.繁殖システムと送粉共生系との関係は資源環境が安定した時期には特に重要な役割を果たしている.植物の繁殖成功を評価するにあたっては,花粉制限を引き起こす植物と花粉媒介昆虫の相互作用に加え,光合成活性や獲得資源の分配様式を統合的な理解をしていく必要があると考えられる., kaken
- 基盤研究(C)（一般）, 2025 - 2029, 2 4 K 0 9 6 1 8, Principal investigator, 気候変動による温暖化や熱波が送粉生態系に与える影響の評価
■Ⅲ．社会連携活動実績
