AWATA Satoshi

写真a

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Title

Associate Professor

Laboratory location

Sugimoto Campus

Degree 【 display / non-display

  • Osaka City University -  Doctor (Science)

Research Areas 【 display / non-display

Ecology/Environment

Research Interests 【 display / non-display

Cichlids, Parasitism, Marine sculpins, Mutualism, Sperm competition, Sperm evolution, Reproductive strategy, Behavioral Ecology, Female control, Fishes

Committee Memberships 【 display / non-display

  • 2019.01
    -
    2019.09

    The Ichthyological Society of Japan  

  • 2010.04
    -
    Today

      Associate Editor

Current Career 【 display / non-display

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

Graduate School 【 display / non-display

  • 2000.04
    -
    2005.03

    Osaka City University  Graduate School, Division of Natural Science 

  • 1998.04
    -
    2000.03

    Osaka City University  Graduate School, Division of Natural Science 

Graduating School 【 display / non-display

  • 1994.04
    -
    1998.03

    Osaka University   Faculty of Science  

 

Published Papers 【 display / non-display

  • The first record of egg masses in tunicates deposited by the snubnose sculpin, Orthonopias triacis, from the Northeastern Pacific: evidence for convergent evolution of an unusual reproductive strategy.

    Awata S, Ito T, Crow KD, Koya Y, Munehara H

    Journal of fish biology  2021.10  [Refereed]

    DOI PubMed

  • Subordinate Fish Mediate Aggressiveness Using Recent Contest Information

    Hotta Takashi, Awata Satoshi, Jordan Lyndon A., Kohda Masanori

    FRONTIERS IN ECOLOGY AND EVOLUTION  9 2021.09  [Refereed]

    DOI

  • Prosocial and antisocial choices in a monogamous cichlid with biparental care.

    Satoh S, Bshary R, Shibasaki M, Inaba S, Sogawa S, Hotta T, Awata S, Kohda M

    Nature communications  12 ( 1 ) 1775 2021.03  [Refereed]

    DOI PubMed

  • The functional role of sibling aggression and "best of a bad job" strategies in cichlid juveniles

    Satoh Shun, Nishida Yuusuke, Saeki Taiga, Kawasaka Kento, Kohda Masanori, Awata Satoshi

    Behavioral Ecology  2021.03  [Refereed]

     View Summary

    Siblings often compete for limited resources, such as food provided by their parents. However, although several functions of nonlethal sib- ling (nonsiblicidal) aggression have been proposed, there is currently little empirical evidence for these, apart from food monopolization. Here, we investigated the functions of nonlethal sibling aggression in the biparental-caring territorial herbivorous cichlid Varibilichromis moorii. We found that the juveniles of this species are highly aggressive and that larger juveniles are more aggressive toward their smaller siblings. Larger juveniles feed on algae more frequently than smaller siblings, thereby indicating a dominance hierarchy. Sibling aggression decreased when algae in the nest was experimentally removed. Furthermore, the removal of smaller juveniles decreased sibling aggression among the remaining larger juveniles, whereas the removal of larger juveniles increased aggression among smaller juveniles. The algal feeding rate of juveniles only increased when larger individuals were removed from the nest. Moreover, larger juveniles attained higher growth rates and remained in natal nests longer than smaller individuals. Our results indicate that sibling aggression may facilitate the mo- nopolization of resources by larger juveniles and extend the parental care period. Interestingly, a small subset of juveniles was observed to migrate to other nests. These juveniles were larger than those of the host brood, and their growth rate increased within the new nests. We suggest that subordinate juveniles may disperse from natal nests and sneak into new nests to enhance their rank, which may represent a novel example of a “best of a bad job” strategy associated with sibling competition.

    DOI

  • Fertilization modes drive the evolution of sperm traits in Baikal sculpins

    Ito, T., Kinoshita, I., Tahara, D., Goto, A., Tojima, S., Sideleva, V. G., Kupchinsky, A. B., Awata, S.

    Journal of Zoology  2021.02  [Refereed]

     View Summary

    Baikal sculpins are a unique group of fishes, including both externally and internally fertilizing species. Sperm traits, such as morphology and motility, are predicted to undergo adaptive changes due to species fertilization modes. However, studies exploring such traits in Baikal sculpins are lacking. Here, we conducted a field study and investigated sperm traits of three sculpins with external fertilization (Cottocomephorus grewingkii, Leocottus kesslerii and Paracottus knerii) and one sculpin with internal fertilization (Comephorus dybowskii). Sperm head morphology was spherical in both types of fertilizing species; however, the head cross‐sectional area of the sperm of the internal fertilizer was smaller than that of external fertilizers. This result implies that sperm head morphology might be adapted to swim in a viscous ovarian fluid. The internal fertilizer, C. dybowskii, had longer and faster‐swimming sperms with longer motility duration than the external fertilizers, perhaps due to different sperm competition levels. Sperms of the internal fertilizer were only motile in isotonic solutions, whereas sperms of the external fertilizers were motile in lake waters, suggesting that sperm motilities are specialized according to their external/internal environments. To our knowledge, this is the first study to demonstrate sperm traits of Baikal sculpins, which may have evolved adaptively along with changing fertilization modes.

    DOI

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Review Papers (Misc) 【 display / non-display

Conference Activities & Talks 【 display / non-display

  • 中村陽一, 安房田智司, 成松庸二, 宗原弘幸

    2020.10 

  • 魚類の交尾に伴う精子の進化:近縁種間比較研究から見えてきたこと

    安房田智司, 伊藤岳  [Invited]

    2019.09 

  • A novel aspect of goby-shrimp mutualism: Shrimp excavate sand sediments and provide food to the goby.

    Awata S, Yamanouchi H, Saeki T, Satoh S, Sogawa S, Kohda M

    Behaviour 2019  2019.07 

  • Supplementary mark-test for mirror self-recognition of the cleaner wrasse.

    Kohda M, Awata S, Kubo N, Fujita A, Jordan A

    Behaviour 2019  2019.07 

  • タンガニイカ湖産カワスズメ科魚類における協同繁殖

    佐伯泰河, 佐藤駿, 安房田智司, 幸田正典

    日本生態学会大会講演要旨(Web)  2019.02 

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

  • Studies on the evolution of mating systems and parental care patterns of the cichlid fishes in the ancient African lake: ecological, cognitive and neurophysiological approaches.

    Project/Area Number : 20KK0168  Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)) Representative

    Project Year :

    2020.10
    -
    2025.03
     

  • Exploring genomic signatures of Ryukyu-ayu to inform the survival of an endangered fish species

    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) Partaker / Other

    Project Year :

    2020.04
    -
    2023.03
     

  • Evolution of social structure and mating systems in a tribe Lamprologini cichlids: A model system of social evolution in vertebrate

    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Partaker / Other

    Project Year :

    2019.04
    -
    2022.03
     

  • Molecular mechanisms of sperm evolution associated with changes of fertilization modes in fish

    Project/Area Number : 17K19518  Grant-in-Aid for Challenging Research (Exploratory) Representative

    Project Year :

    2017.06
    -
    2020.03
     

     View Summary

    We investigated sperm morphology and motility of 10 marine fishes including fish groups that comprise both non-copulatoryand copulatory species within closely related species. Sperm heads of copulatory species were significantly longer and slender than those of non-copulatory species. Sperms of the copulatory species were motile only in the isotonic solution, whereas sperms of the non-copulatory species were motile in seawater. This result demonstrates for the first time that sperm head morphology and motility may have evolved adaptively along with changing of the fertilization modes. To clarify the mechanisms of sperm evolution associated with changes of the fertilization modes, proteome analysis was performed using spermatozoa and seminal plasma of copulatory and non-copulatory sculpin species. The seminal plasma proteins differed greatly between copulatory and non-copulatory species, and these proteins were identified to play a role in immunity and protection against metal ions.

  • Evolutionary and ecological studies on sperm and reproductive modes in marine sculpins

    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B) Representative

    Project Year :

    2016.04
    -
    2019.03
     

    Partaker : Awata Satoshi

     View Summary

    Marine sculpins (Cottidae) exhibit diverse reproductive modes and parental behaviors within a family: non-copulatory- and copulatory species with male care, copulatory species with female care and copulatory species with ostracophils. Here, the effects of reproductive modes and the mode of parental care on the evolution of sperm traits (sperm morphology and motility), male genitalia and ovipositor were investigated in 37 sculpin species. (1) We show that sperm traits and male genitalia may have evolved driven by environmental factors independent of the phylogeny in this group. This may be the first report showing the evolution of sperm depending on the copulatory behavior and sperm competition among animals. (2) We also show that ovipositor length and morphology in ostracophilous sculpins could change owing to the host species used (tunicates or sponges) and their size, even among conspecific populations of marine fish with presumably low dispersal ability.

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

  • Contribution to internationalization

    (2020)

  • Improvement of educational methods

    (2020)

  • Contribution to internationalization

    (2019)

  • Improvement of educational methods

    (2019)

  • Contribution to internationalization

    (2018)

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Foreigner acceptance 【 display / non-display

  • Academic year : 2020

     View Details

    Number of foreigners accepted
    1
    Number of International Students
    1

    Australia

  • Academic year : 2019

     View Details

    Number of foreigners accepted
    1
    Number of International Students
    1

    Australia

  • Academic year : 2018

     View Details

    Number of foreigners accepted
    1
    Number of International Students
    1

    Democratic Republic of the Congo

  • Academic year : 2017

     View Details

    Number of foreigners accepted
    1
    Number of International Students
    1

    United States of America, Democratic Republic of the Congo