ITOH Akira

写真a

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Title

Professor

Laboratory location

Sugimoto Campus

Degree 【 display / non-display

  • Kyoto University -  Doctor of Agriculture

Research Areas 【 display / non-display

Plant Ecology, Tropical Ecology, plant invasion, tropical forest

Research Career 【 display / non-display

  • Hybridization between Japanese and Europian dandelions

    (Collaboration in Japan)

    Keyword in research subject:  dandelion, hybrid, ploidy

  • Study on rehabilitation of tropical rain forests

    (International Collaboration)

    Keyword in research subject:  tropical rain forest, rehabilitation

  • Study on regeneration of tropical rain forest tree species

    (International Collaboration)

    Keyword in research subject:  tropical rainforest, regeneration

  • Study on mechanisms of maintenance of tree species diversity in tropical rain forests

    (International Collaboration)

    Keyword in research subject:  tropical rain forest, species diversity

Association Memberships 【 display / non-display

  • Japanese Society of Ecology

  • The Japan Society of Tropical Ecology

  • Association for Tropical Biology and Conservation

Committee Memberships 【 display / non-display

  • 2017.10
    -
    Today

    Science Council of Japan   Member

  • 2017.03
    -
    2018.03

    Ecological Society of Japan   Japanese Journal of Ecology Editor in Chief

  • 2017.01
    -
    Today

    Ecological Society of Japan   Japanese Journal of Ecology Editor in Chief

  • 2010.04
    -
    2014.03

    The Japan Society of Tropical Ecology  

  • 2005.04
    -
    Today

    The Japan Society of Tropical Ecology  

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Current Career 【 display / non-display

  • Osaka City University   Graduate School of Science   Biology and Geosciences Course   Professor  

Graduate School 【 display / non-display

  •  
    -
    1995

    Kyoto University  Graduate School, Division of Agriculture 

Graduating School 【 display / non-display

  •  
    -
    1988

    Kyoto University   Faculty of Agriculture  

 

Published Papers 【 display / non-display

  • Global importance of large-diameter trees

    Lutz James A., Itoh Akira, et al. (97名中46番目)

    GLOBAL ECOLOGY AND BIOGEOGRAPHY  27 ( 7 ) 849 - 864 2018.07  [Refereed]

    DOI

  • Are patterns of fine-scale spatial genetic structure consistent between sites within tropical tree species?

    Smith James R., Ghazoul Jaboury, Burslem David F. R. P., Itoh Akira, Khoo Eyen, Lee Soon Leong, Maycock Colin R., Nanami Satoshi, Ng Kevin Kit Siong, Kettle Chris J.

    PLOS ONE  13 ( 3 )  2018.03  [Refereed]

    DOI

  • Hybridization rate and genotypic diversity of apomictic hybrids between native (Taraxacum japonicum) and introduced (T. officinale) dandelions in western Japan

    Matsuyama Shuhei, Morimoto Miki, Harata Tsuyoshi, Nanami Satoshi, Itoh Akira

    CONSERVATION GENETICS  19 ( 1 ) 181 - 191 2018.02  [Refereed]

    DOI

  • Plant invasion: Another threat to the Sao Paulo Marsh Antwren (Formicivora paludicola), a species on the verge of extinction

    Del-Rio Glaucia, Rego Marco Antonio, Silveira Luis Fabio, Itoh Akira

    PLOS ONE  12 ( 12 )  2017.12  [Refereed]

    DOI

  • Dioecious plants are more precocious than cosexual plants: A comparative study of relative sizes at the onset of sexual reproduction in woody species

    Ohya Itsuki, Nanami Satoshi, Itoh Akira

    ECOLOGY AND EVOLUTION  7 ( 15 ) 5660 - 5668 2017.08  [Refereed]

    DOI

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Books etc 【 display / non-display

  • Floristics and Vegetation of the Forest Dynamics Plots

    Ashton PS and CTFS Working Group (Part: Contributor )

    Tropical Forest Diversity and Dynamism: Findings from a Large-Scale Network Forest Dynamics Plots. The University of Chicago Press  2004

  • An approach for assessing species-specific density-dependence and habitat effects on recruitment of a tropical rain forest tree

    Itoh A, Rokujo N, Kanzaki M, Yamakura T, LaFrankie JV, Ashton PS and Lee HS (Part: Contributor )

    Tropical Forest Diversity and Dynamism: Findings from a Large-Scale Network Forest Dynamics Plots. The University of Chicago Press  2004

  • Lambir Hills Forest Dynamic Plot

    Lee HS, Tan S, Davies S, LaFrankie JV, Ashton PS, Yamakura T, Itoh A, Ohkubo T and Harrison R (Part: Contributor )

    Tropical Forest Diversity and Dynamism: Findings from a Large-Scale Network Forest Dynamics Plots. The University of Chicago Press  2004

  • Species-Area Relationships and Diversity Measures in the Forest Dynamics Plots

    Condit R, Leigh EGJr, Loo de Lao S and CTFS Working Group (Part: Contributor )

    Tropical Forest Diversity and Dynamism: Findings from a Large-Scale Network Forest Dynamics Plots. The University of Chicago Press  2004

  • The 52-hectare forest research plot at Lambir Hills, Sarawak, Malaysia: tree distribution maps, diameter tables and species documentation.

    (Part: Joint Editor )

    Lee Miing Press, Malaysia  2002

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Review Papers (Misc) 【 display / non-display

  • Canopy dominance of Dryobalanops and diversity of tropical rain forest

      146 - 161 2000

Conference Activities & Talks 【 display / non-display

  • Community phylogeny and niche divergence of a tropical rain forest in Borneo

    Okuno S, Yin TT, Itoh A, Nanami S, Matsuyama S, Tan S, Mohamad M  [Invited]

    The 55th Annual Meeting of Association of Tropical Biology and Conservation (ATBC)  2018.07 

  • Global patterns in the slow-fast continuum of tropical tree demography: the roles of tolerance and responsiveness

    Russo SE, McMahon SM, Detto M, Wright SJ, Condit RS, Davies SJ, Itoh A, et al.  [Invited]

    The 55th Annual Meeting of Association of Tropical Biology and Conservation (ATBC)  2018.07 

  • Effects of forest fragmentation on gene flow in two dipterocarp tree species in tropical rain forests in Sarawak, Malaysia

    Nanami S, Ozaki T, Yamakura T, Itoh A, Tan S, Diway B, Chong L

    The 55th Annual Meeting of Association of Tropical Ecology and Conservation (ATBC)  2018.07 

  • Phylogeny and ecological traits of dioecious trees in a tropical rain forest in Borneo

    Ohya I, Itoh A, Nanami S, Tan S, Mohamad MB

    The 55th Annual Meeting of Association of Tropical Biology and Conservation (ATBC)  2018.07 

  • Dioecious plants compensate for reproductive disadvantages by precocious flowering

    Ohya I, Nanami S, Itoh A

    The 8th East Asian Federation of Ecological Societies International Congress  2018.04 

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Other Research Activities (Works) 【 display / non-display

  • Field expriment on phenology of Dry Dipterocarp Forests

    Fieldwork 

    2000
     
     
  • Restoratim ecology of tropical rain forests in Southeast Asia

    1995
     
     
  • A Study on Forest Maintenance by Production of Non-wood Product in Thailand

    1990
     
     
  • Ecological Study on a Mixed Dipterocarp Forest in Sarawak

    1990
     
     
  • Survey on Forest Utilization in South China

    1989
     
     

Grant-in-Aid for Scientific Research 【 display / non-display

  • Invasion process of apomictic plants: a case study of hybrid dandelions in Japan

    Project/Area Number : 18H02224  Grant-in-Aid for Scientific Research(B) Representative

    Project Year :

    2018.04
    -
    2022.03
     

  • Niche conservatism in a tree community of a Bornean rain forest: is phylogenetic diversity a significant index for biodiversity conservation of tropical rain forest?

    Project/Area Number : 26304027  Grant-in-Aid for Scientific Research(B) Representative

    Project Year :

    2014.04
    -
    2017.03
     

    Partaker : MATSUYAMA SHUHEI, MOHAMAD MOHIZAH, STUART DAVIES, SYLVESTER TAN, YIN TINGTING, OKUNO SEIYA, NTKATANI TAKAHITO

     View Summary

    We discussed the significance of "phylogenetic diversity (diversity of evolutionary history)" as an index for biodiversity conservation of tropical rain forest. Using a detailed molecular phylogeny estimated for 699 tree species in a Bornean rain forest, we found that maximum size and demographic traits, such as mortality and growth rates, were more similar among phylogenetically more closely related species, while habitat niche was various even among them. This suggests that niche habitat is an evolutionary labile trait and that divergence in habitat niche may enhance coexistence of closely related species, which have similar adult size and demographic traits. We also found that the relationship between species and phylogenetic diversity was not straightforward but rather complicated, which suggested that we need to consider both species and phylogenetic diversity simultaneously in biodiversity conservation of tropical rain forest.

  • Development and application of sex-linked DNA markers in a natural population of a dioecious tree

    Project/Area Number : 25660125  Grant-in-Aid for challenging Exploratory Research Partaker / Other

    Project Year :

    2013.04
    -
    2017.03
     

     View Summary

    Five sex-linked DNA markers were developed in Nageia nagi (Podocarpaceae), a dioecious tree, using genome-wide RAD sequence data. We got 250,000 DNA sequence leads (100 bp) per individual in average. Although no female-specific sequences were found from these leads, 5 male-specific sequences were obtained. For the 5 sequences, PCR primer pairs were designed to identify sex of non-reproductive individuals.
    For the assessment of sex ratio of non-reproductive seedlings, 148 seedlings from 4 sites in a natural population were analyzed on Mt. Mikasa, Nara Prefecture, Japan. The number of analyzed seedlings in a site raged from 32 to 45, and the proportion of males in a site varied from 0.465 to 0.600. No significant deviations of sex ratio from 1:1 were detected in any sites, and sex ratios were not significantly different among 4 sites. In the natural population of N. nagi, expected sex ratio at seedling stage was considered as 1:1 in any sites.

  • Estimating origin and expansion process of hybrid dandelions in Japan with genetic and ecological analysis

    Project/Area Number : 24510330  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2012.04
    -
    2015.03
     

    Partaker : HIRAYAMA Daisuke, MATSUYAMA Shuhei, NANAMI Satoshi, TONAKA Misato, TENUEN, MIYOSHI Kohei, SUGAI Shota, YOKOYAMA Ryosuke

     View Summary

    We studied origin and expansion process of hybrid dandelions in Japan with genetic analysis and cultivation experiment. We found unique cpDNA types to Taraxacum japonicum or other diploid native dandelions, indicating a possibility to use cpDNA for estimating origin of hybrids. We found only few hybrids that had unique cpDNA to T. japnicum. Proportion of hybrids in apparent exotic dandelions were higher in eastern than western Japan. The cultivation experiment showed that hybrids growing in different vegetation differed in cpDNA and growth features. These results suggest that difference in native dandelions that produced hybrids may influence the frequency, establishment and expansion of hybrid dandelions in Japan.

  • Study of distribution and dynamics of hybrid dandelions in Western Japan based on a research by collaboration with citizens

    Project/Area Number : 21510243  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2009
    -
    2011
     

    Partaker : NANAMI Satoshi

     View Summary

    Based on a study by collaboration with citizens, 61% of apparent Taraxacum officinale(an extotic dandelion) and 31% of apparent T. laevigatum in Western Japan were hybrids with Japanese dandelions. There were areas with high hybrid ratios even in the regions where very few native dandelions were distributed. Molecular genetic analysis showed high genetic diversity in hybrid populations, which suggested frequent hybridization. On the other hand, there were little evidence of hybridization within mixed populations of native and exotic species. The results suggested that hybridization within populations and/or local areas were less frequent than immigration of hybrids from other populations or areas.

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Other educational activity and Special note 【 display / non-display

  • Improvement of educational methods

    (2018)

  • Class teacher

    (2018)

  • Improvement of educational methods

    (2017)

  • Improvement of educational methods

    (2017)

  • Contribution to internationalization

    (2017)

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Foreigner acceptance 【 display / non-display

  • Academic year : 2018

     View Details

    Number of foreigners accepted
    0
    Number of International Students
    0
  • Academic year : 2017

     View Details

    Number of foreigners accepted
    1
    Number of International Students
    1

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