Updated on 2025/09/30

写真a

 
FUJIOKA HARUNA
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Assistant Professor
Position
Assistant Professor
External link

Degree

  • Ph.D ( 2020.3   The University of Tokyo )

Research Interests

  • 動物行動学

  • 時間生物学

  • 社会性昆虫

  • アリ

  • 概日リズム

  • 日周リズム

  • 栄養交換

Research History

  • Okayama University   Graduate School of Environment, Life, Natural Science and Technology

    2024

      More details

  • Okayama University   The Graduate School of Environmental and Life Science   Assistant Professor

    2021.10

      More details

    Country:Japan

    researchmap

  • Osaka City University

    2020.10 - 2021.9

      More details

  • Osaka City University

    2020.3 - 2020.10

      More details

  • The University of Tokyo   Graduate School of Arts and Sciences

    2018.4 - 2020.3

      More details

 

Papers

  • Unravelling the dietary ecology and traditional entomophagy of Vespula shidai in central Japan: insights from DNA metabarcoding and local practices

    Tatsuya Saga, Haruna Fujioka

    Journal of Insects as Food and Feed   2025.5

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1163/23524588-bja10201

    researchmap

  • Effects of caffeine on the longevity and locomotion activity of the common green bottle fly, Lucilia sericata (Diptera: Calliphoridae) Reviewed

    Shine Shane Naing, Haruna Fujioka, Teruhisa Matsuura, Takahisa Miyatake

    Applied Entomology and Zoology   2025.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    The common green bottle fly, Lucilia sericata (Meigen) (Diptera: Calliphoridae), is a promising and useful managed pollinator for greenhouse agricultural crops. The fly can pollinate at lower and higher temperatures than European honeybee. However, management of the longevity of pollinators is important for growers using greenhouses. Previous studies using other insects showed that caffeine affects insect longevity and behaviors. For instance, European honeybee live longer and have increased memory after caffeine consumption. How caffeine affects the longevity and behavior of pollinators is worth investigating because it can affect pollinator’s behavior, extend longevity, or be an insecticide against pollinators. In the present study, therefore, the longevity and locomotion of L. sericata were investigated when they were given different caffeine concentrations. First, the longevity of L. sericata with five different caffeine concentrations was compared to the control. The results showed that higher concentrations of caffeine (2%, 1%, and 0.5%) significantly decreased the life span compared to lower concentrations (0.05% and 0.01%). Second, the locomotion activities of L. sericata were examined at those two caffeine concentrations with treated and control male and female flies utilizing a Drosophila Activity Monitor (DAM). Treatment with 0.05% caffeine dramatically reduced locomotion, but treatment of 0.01% caffeine did not. We also compared lipid concentrations of flies: flies treated with 0.05% caffeine had a lower lipid concentration compared to flies treated with 0% and 0.01% caffeine. These results indicate that caffeine had negative effects on the longevity and locomotion activities of the pollinator L. sericata in laboratory conditions.

    DOI: 10.1007/s13355-025-00893-0

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s13355-025-00893-0/fulltext.html

  • Mature larvae continue calling at night inVespa mandariniafrom laboratory observations

    Haruna Fujioka, Tatsuya Saga

    2024.9

  • Hereditary nature of death-feigning frequency in a parasitoid wasp Heterospilus prosopidis using sib analysis

    Haruna Fujioka, Takahisa Miyatake, Yusaku Ohkubo, Masakazu Shimada

    Journal of Evolutionary Biology   2024.8

     More details

    Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/jeb/voae079

    researchmap

  • No sign of reproductive cessation in the old workers of a queenless ponerine ant Reviewed

    Kodai Kishino, Keiko Sakiyama, Haruna Fujioka, Yasukazu Okada

    Behavioral Ecology and Sociobiology   78 ( 3 )   2024.2

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    In many social hymenopterans, workers of different ages engage in different tasks; younger workers remain inside the nest as intranidal workers, while older workers go outside the nest as extranidal workers (i.e., age polyethism). Previous studies have shown that ovarian activity is diminished in old, extranidal workers, but it remains unclear whether workers’ reproductive ability persists for life or whether they exhibit post-reproductive lifespans. In this study, we investigated the age-dependence of worker reproductive ability in a monomorphic ponerine ant Diacamma cf. indicum. In Diacamma ants, all females in a colony have reproductive ability, but effective reproduction is limited to one or a few dominant females, and the remaining females act as sterile helpers. Using long-term laboratory rearing, we investigated whether worker reproductive ability lasts throughout a worker’s lifetime. The ages of workers were accurately tracked, and the reproductive ability of young and old workers was examined by creating several gamergate-less sub-colonies. Results showed that at least one individual in each sub-colony developed ovaries, even in the sub-colonies that solely consisted of very old workers (> 252 days old). Interestingly, in the presence of younger workers, old workers rarely showed ovarian development. Besides age, we found a positive correlation between the amount of fat (i.e., nutritional condition) and ovarian development in old workers. Our data suggest that reproductive activity of old workers is low but maintained throughout their life in Diacamma.

    Significance statement

    Females of social animals, such as cetaceans, are known to stop reproducing before the end of their lifespan. It is suggested that the reproductive ability of ant queens does not decline and is maintained throughout their lives; however, it is unclear whether this is also true in ant workers. We maintained ant colonies for more than 500 days and then tested whether the reproductive ability of ant workers is maintained throughout their lifespan. Even in small groups composed of only very old workers (> 252 days old), at least one individual in each group always reproduced actively. Interestingly, the presence of young workers seemed to suppress the reproduction of old workers. In addition, fat content was positively associated with the individual’s reproductive potential.

    DOI: 10.1007/s00265-024-03445-8

    researchmap

    Other Link: https://link.springer.com/article/10.1007/s00265-024-03445-8/fulltext.html

  • Diacamma ants adjust liquid foraging strategies in response to biophysical constraints Reviewed

    Haruna Fujioka, Manon Marchand, Adria C. LeBoeuf

    Proceedings of the Royal Society B: Biological Sciences   290 ( 2000 )   2023.6

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:The Royal Society  

    Ant foragers provide food to the rest of the colony, often requiring transport over long distances. Foraging for liquid is challenging because it is difficult to transport and share. Many social insects store liquids inside the crop to transport them to the nest, and then regurgitate to distribute to nest-mates through a behaviour called trophallaxis. Some ants instead transport fluids with a riskier behaviour called pseudotrophallaxis—holding a drop of liquid between the mandibles through surface tension. Ants share this droplet with nest-mates without ingestion or regurgitation. We hypothesised that ants optimize their liquid-collection approach depending on viscosity. Using an ant that employs both trophallaxis and pseudotrophallaxis, we investigated the conditions where each liquid-collection behaviour is favoured by measuring biophysical properties, collection time and reaction to food quality for typical and viscosity-altered sucrose solutions. We found that ants collected more liquid per unit time by mandibular grabbing than by drinking. At high viscosities ants switched liquid collection method to mandibular grabbing in response to viscosity and not to sweetness. Our results demonstrate that ants change transport and sharing methods according to viscosity–a natural proxy for sugar concentration–thus increasing the mass of sugar returned to the nest per trip.

    DOI: 10.1098/rspb.2023.0549

    researchmap

    Other Link: https://royalsocietypublishing.org/doi/full-xml/10.1098/rspb.2023.0549

  • Socially transferred materials: why and how to study them Reviewed

    Sanja Maria Hakala, Haruna Fujioka, Katharina Gapp, Ornela De Gasperin, Eléonore Genzoni, Rebecca M. Kilner, Joris M. Koene, Barbara König, Timothy A. Linksvayer, Marie-Pierre Meurville, Matteo A. Negroni, Hugo Palejowski, Stuart Wigby, Adria C. LeBoeuf

    Trends in Ecology & Evolution   2022.12

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.tree.2022.11.010

    researchmap

  • Individual Ants Do Not Show Activity-Rest Rhythms in Nest Conditions Reviewed

    Haruna Fujioka, Masato S. Abe, Yasukazu Okada

    Journal of Biological Rhythms   36 ( 3 )   297 - 310   2021.6

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:SAGE Publications  

    DOI: 10.1177/07487304211002934

    Scopus

    researchmap

    Other Link: http://journals.sagepub.com/doi/full-xml/10.1177/07487304211002934

  • Bipartite network analysis of ant-task associations reveals task groups and absence of colonial daily activity Reviewed

    Haruna Fujioka, Yasukazu Okada, Masato S. Abe

    Royal Society Open Science   8 ( 1 )   201637 - 201637   2021.1

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:The Royal Society  

    DOI: 10.1098/rsos.201637

    Scopus

    researchmap

    Other Link: https://royalsocietypublishing.org/doi/full-xml/10.1098/rsos.201637

  • A specific type of insulin-like peptide regulates the conditional growth of a beetle weapon Reviewed

    Yasukazu Okada, Masako Katsuki, Naoki Okamoto, Haruna Fujioka, Kensuke Okada

    PLOS Biology   17 ( 11 )   e3000541 - e3000541   2019.11

     More details

    Publishing type:Research paper (scientific journal)   Publisher:Public Library of Science (PLoS)  

    DOI: 10.1371/journal.pbio.3000541

    Scopus

    PubMed

    researchmap

  • Liquid exchange via stomodeal trophallaxis in the ponerine ant Diacamma sp. from Japan Reviewed

    Haruna Fujioka, Yasukazu Okada

    Journal of Ethology   37 ( 3 )   371 - 375   2019.9

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s10164-019-00602-9

    Scopus

    researchmap

    Other Link: http://link.springer.com/article/10.1007/s10164-019-00602-9/fulltext.html

  • Observation of plugging behaviour reveals entrance‐guarding schedule of morphologically specialized caste in Colobopsis nipponicus Reviewed

    Haruna Fujioka, Masato S. Abe, Yasukazu Okada

    Ethology   125 ( 8 )   526 - 534   2019.8

     More details

    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/eth.12877

    Scopus

    researchmap

    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/eth.12877

  • Ant activity-rest rhythms vary with age and interaction frequencies of workers Reviewed

    Haruna Fujioka, Masato S. Abe, Yasukazu Okada

    Behavioral Ecology and Sociobiology   73 ( 3 )   2019.3

     More details

    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s00265-019-2641-8

    Scopus

    researchmap

    Other Link: http://link.springer.com/article/10.1007/s00265-019-2641-8/fulltext.html

  • Ant circadian activity associated with brood care type Reviewed

    Haruna Fujioka, Masato S. Abe, Taro Fuchikawa, Kazuki Tsuji, Masakazu Shimada, Yasukazu Okada

    Biology Letters   13 ( 2 )   20160743 - 20160743   2017.2

     More details

    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:The Royal Society  

    DOI: 10.1098/rsbl.2016.0743

    Scopus

    PubMed

    researchmap

    Other Link: https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2016.0743

  • Quantification and Analysis on Animal Social Behavior Reviewed

    Masato S. Abe, Haruna Fujioka

    Journal of Robotics Society of Japan   36 ( 6 )   22 - 28   2017

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.7210/jrsj.35.455

    researchmap

▼display all

Research Projects

  • Brood-care strategies during claustral colony foundation by queen ants

    Grant number:23K05937  2023.04 - 2027.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    宮崎 智史, 藤岡 春菜, 林 良信

      More details

    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

    トビイロケアリの蟄居型創設女王は6週間に及ぶコロニー創設の過程で、少なくとも3-6週目に、胸嚢に黄色の液体を貯蔵していることを明らかにした。そのコロニー創設の過程で創設女王の胸嚢から貯蔵液体を実験的に除去したところ、子供の数が減少した。この結果は胸嚢に貯蔵された液体の除去が育児に負の影響を及ぼすことを意味しており、胸嚢貯蔵物が幼虫の餌として利用されるとする仮説を支持するものであった。この研究成果は日本昆虫学会第84回大会・ 第68回日本応用動物昆虫学会 合同大会にて報告された。また、除去した胸嚢貯蔵物の成分分析の準備を進めている。
    蟄居型創設過程を通したトランスクリプトームデータを取得することができ、それらのデータ解析も進めている。
    蟄居型創設種の比較対象となる非蟄居型創設種の中から、モデル種の一つとしてヒメアギトアリを選定した。その繁殖様式を調べたところ、少なくとも飼育条件下では新女王が未受精のままメスを生産することが確かめられた。これはアリ科 (Foricidae) の雌性単為生殖としては20例目の報告例であり、ハリアリ亜科 (Ponerinae) としては2例目、ハリアリ亜科の95%の種を擁する主要なグループであるPonerini族としては初めての報告であった。この研究成果をまとめた論文はAsian Myrmecology誌に掲載された。またこの研究成果は、ヒメアギトアリは新女王を未受精のまま隔離することで非蟄居型創設を誘導できる可能性を示している。ほとんどのアリ種において人工条件下での交配が容易ではないことを考慮すると、この方法は本研究課題を推進する上で非常に有効であると考えられる。

    researchmap

  • アリの常時活動性を生み出す分子基盤の解明

    Grant number:23K14228  2023.04 - 2026.03

    日本学術振興会  科学研究費助成事業  若手研究

    藤岡 春菜

      More details

    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    ほとんどの生物は、24 時間周期で繰り返される昼夜サイクルに適応した、概日リズムを備えている。この概日リズムに影響を与えるのは、光や温度などの非生物的な環境要因だけでなく、個体間の相互作用など生物的要因も含まれる。しかし、この生物的要因がどのように個体の概日リズムに影響を与えるかは未解明な点が多い。近年、アリやミツバチなどの社会性昆虫において、概日リズムと社会的環境が強く関連する個体間の同調現象に加え、繁殖や育児さらに成虫間相互作用に関連して起こる概日リズムの消失が報告されている。
    <BR>
    本研究課題では、概日活動リズムの表現型が既知のトゲオオハリアリを材料に、常時活動性が概日時計が止まることで引き起こされるのか、概日時計の下流にある系が変化することで引き起こされるのかを明らかにすることを目的とする。トゲオオハリアリでは、未成熟個体との相互作用によって、常時活動性へと行動が変化する。この常時活動時に概日時計が動いているのかを明らかにするため、概日リズムを生み出す中核となる時計遺伝子と時計タンパク質の日周的発現振動を解析する。さらに、概日時計が動いているにもかかわらず、常時活動性が起こる場合を考慮し、概日時計の下流で働く2つの神経伝達物質の局在と日周的発現振動も調べることで、概日時計と被駆動系の双方から、常時活動性を生み出す分子機構の解明を目指す。

    researchmap

  • スズメバチにおける栄養交換の機能解析

    2022

    八雲財団 

      More details

    Authorship:Principal investigator 

    researchmap

  • 時空間からみた社会性昆虫の分業メカニズム:全個体トラッキングによるアリの行動解析

    Grant number:18J13369  2018.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows  Grant-in-Aid for JSPS Fellows

    藤岡 春菜

      More details

    Grant amount:\1700000 ( Direct expense: \1700000 )

    社会性昆虫では、ワーカー(働きアリ)が巣内の育児や掃除、防御、採餌などさまざま仕事について、分業が行われている。どの個体がどの仕事を行うかという担当は、日齢によっておおまかに決まるが、コロニー(巣)内の状況により、仕事量は変動する。その変動に柔軟に対応するため、個体間相互作用による仕事の割り当てや働く時間の調整がなされていると考えられる。しかし、技術的な問題から、社会性昆虫の集団レベルでの定量的な行動観察はほとんど行われていなかった。本研究は、コロニーレベルでトゲオオハリアリ(Diacamma sp. from Okinawa)の行動を定量的に測定し、各個体の仕事内容がどのように決まるのかという、分業メカニズムの解明をめざした。
    本年度は、継時的な飼育により各個体の日齢を把握している、計11コロニーを観察し、どの個体が、いつ何をしているのかを解析した。位置情報から自動的に巣内と巣外の滞在時間を個体ごとに計算し、外勤活動率を調べた。従来の報告通り、老齢の個体が外勤活動を盛んに行なっていたものの、同じ齢でも個体差が大きいことを発見した。このことから、採餌個体は、日齢だけではなく、生理状態や経験など、複数の要因によって、影響を受けることが示唆された。さらに、1日の中で、採餌など外勤活動や育児活動には、変動がなく、昼夜問わず仕事をしていることがわかった。この成果について、論文化に向け準備中である。

    researchmap

 

Media Coverage

  • トゲオオハリアリ 餌「飲む」「つかむ」粘度で使い分け Newspaper, magazine

    山陽新聞  2023.8.3

     More details

    Author:Other 

    researchmap

  • 粘度 アリなら「つかんで」運ぶ

    朝日新聞(岡山)  2023.6.17

     More details

    Author:Other 

    researchmap