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Midori Tuda Last modified date:2018.03.17

Associate Professor / Agricultural Bioresource Sciences
Department of Bioresource Sciences
Faculty of Agriculture

Graduate School
Other Organization

Research themes, collaboration, and publications .
Academic Degree
Field of Specialization
Population ecology, Evolutionary ecology
Outline Activities
Prey-predator or host-parasitoid population dynamics, evolutionary ecology and speciation, using both laboratory experimental systems and agricultural/forest ecosystems. Effect of global environmental changes such as global warming and atmospheric CO2 rise on predation/parasitization systems. Spatial population dynamics. Chaotic population dynamics. Preadaptation towards pests. Host-plant shift as a possible cause of speciation in herbivores. Anthropogenic, host-plant use, or geographic effects on genetic population structure of pests. Effect of herbivorous insects on seed germination in Fabaceae. Population structure, Wolbachia infection, and evolutionary dynamics of the alfalfa weevil, an invasive pest of leguminous plants.
Research Interests
  • Ecological factors and gene expression of host-shifting insects
    keyword : host plant, herbivorous insect, phytophagous insect, host jump
  • Evolutionary mechanism of intrapopulation polymorphism
    keyword : antenna, sexual conflict
  • Effect of genetic diversity on the persistence of plant-herbivore-parasitoid systems
    keyword : genetic diversity, species diversity
    1995.04Effect of genetic diversity on persistence of host-parasitoid systems.
  • Effect of global warming and CO2 increase on host-parasitoid systems
    keyword : temperature, plant reproductive dynamics, host-parasitoid, predator-prey
    1991.04Effect of global warming on plant-host-parasitoid and plant-predator-prey systems.
  • Factors determining the diversity of bean-bean beetles-parasitoid systems
    keyword : number of species, evolution, plant-herbivore, host-parasitoid
    1995.01Factors determining species diversity of legume-bruchid-parasitoid systems.
  • Effect of genetic diversity and host plants on pests and their natural enemy populations
    keyword : geographic population, molecular marker, human-aided dispersal
    1995.04Genetic diversity and ecological property (host plants, habitat) in pest and natural enemy populations.
  • Detection of nonlinear mechanism from population dynamics data
    keyword : chaos, transient, density dependence, statistical method
    1995.01Detection of nonlinear mechanisms from population dynamics data.
Current and Past Project
  • See Activity
Academic Activities
1. Saeki Y, Tani S, Fukuda K, Iwase S, Sugawara Y, Tuda M, Takagi M, Costs and benefits of larval jumping behaviour of Bathyplectes anurus., The Science of Nature, 10.1007/s00114-015-1324-1, 103, 1, 2016.02.
2. Iwase S, Tani S, Saeki Y, Tuda M, Haran J, Skuhrovec J, Takagi M, Dynamics of infection with Wolbachia in Hypera postica (Coleoptera: Curculionidae) during invasion and establishment., Biological Invasions, 17, 12, 3639-3648, 2015.12.
3. Downey MH, Searle R, Bellur S, Geiger A, Maitner BS, Ohm JR, Tuda M, Miller TEX, A comparative approach to testing hypotheses for the evolution of sex-biased dispersal in bean beetles, Ecology and Evolution, 5, 21, 4819-4828, 2015.11.
4. Arnqvist G, Sayadi A, Immonen E, Hotzy C, Rankin D, Tuda M, Hjelmen CE, Johnston JS, Genome size correlates with reproductive fitness in seed beetles., Proceedings of the Royal Society B, 282 (1815), 20151421, 2015.09.
5. Kergoat GJ, Le Ru BP, Sadeghi SE, Tuda M, Reid CAM, György Z, Genson G, Ribeiro-Costa CS, Delobel A, Evolution of Spermophagus seed beetles (Coleoptera, Bruchinae, Amblycerini) indicates both synchronous and delayed colonizations of host plants., Molecular Phylogenetics and Evolution, 89, 91-103, 2015.08.
6. Iwase S, Nakahira K, Tuda M, Kagoshima K, Takagi M, Host-plant dependent population genetics of the invading weevil Hypera postica, Bulletin of Entomological Research, 2015.02.
7. Ikegawa Y, Ezoe H, Namba T, Tuda M, Effects of nonspecific adaptive defense by pests on efficiency of biological control by multiple natural enemies., Journal of the Faculty of Agriculture, Kyushu University, 59, 2, 305-311, 2014.09.
8. Tuda M, Kagoshima K, Toquenaga Y, Arnqvist G, Global genetic differentiation in a cosmopolitan pest of stored beans: effects of geography, host-plant usage and anthropogenic factors., PLoS ONE, 10.1371/journal.pone.0106268, 9, 9, e106268, 2014.09.
9. Saeki Y, Tuda M, Crowley PH, Allocation trade-offs and life histories: a conceptual and graphical framework., Oikos, 0.1111/oik.00956, 123, 7, 786-793, 2014.07.
10. Tuda M, Li-Hsin Wu, Yamada N, Wang C-P, Wu W-J, Buranapanichpan S, Kagoshima K, Chen ZQ, Teramoto KK, Kumashiro BR, Heu R, Host shift capability of a specialist seed predator of an invasive plant: roles of competition, population genetics and plant chemistry., Biological Invasions, 16, 2, 303-313, 2014.02.
11. T Yahara, F Javadi, Y Onoda, LP de Queiroz, DP Faith, DE Prado, M Akasaka, T Kadoya, F Ishihama, S Davies, JWF Slik, T Yi, K Ma, C Bin, D Darnaedi, RT Pennington, M Tuda, et al., Global legume diversity assessment: concepts, key indicators, and strategies., TAXON, 62, 2, 249-266, 2013.04.
12. Tuda, M., Evolutionary diversification of bruchine beetles: climate-dependent traits and development associated with pest status. , Bulletin of Entomological Research, 101(4), 415-422., 2011.07.
13. Vamosi SM, den Hollander MD, Tuda M, Egg dispersion is more important than competition type for herbivores attacked by a parasitoid., Population Ecology, 53(2): 319–326, 2011.04.
14. Arnqvist, G., Dowling, D.K., Eady, P., Gay, L., Tregenza, T., Tuda, M. and Hosken, D.J., The genetic architecture of metabolic rate: environment specific epistasis between mitochondrial and nuclear genes in an insect., Evolution, 64, 3354-3363, 2010.12, 近年、ミトコンドリア(mt)DNAが、エネルギー生産する酵素複合体を一緒に作る核遺伝子と共進化することが解明されている。これはmt遺伝子と核遺伝子の間のゲノム間エピスタシスが生物個体全体の代謝表現型に影響することを示唆する。そこでヨツモンマメゾウムシの複数のmt系統と核系統間で組み合わせ交配し、代謝率を2つの異なる温度下で測定した。代謝率はmtと核の系統間交互作用と温度に影響された。塩基配列データは、mtの遺伝的変異がこの交互作用の結果を決めることを示唆した。この実験は、2つのゲノムの遺伝的相互作用と遺伝子型x遺伝子型x環境間交互作用を明らかにした。これらの結果は1. 生活史進化一般、特に温度適応の複雑性に洞察を与え、2. 非中立的なmtDNA多型の維持機構を示唆する。
The extent to which mitochondrial DNA (mtDNA) variation is involved in adaptive evolutionary change is currently being reevaluated. In particular, emerging evidence suggests that mtDNA genes coevolve with the nuclear genes with which they interact to form the energy producing enzyme complexes in the mitochondria. This suggests that intergenomic epistasis between mitochondrial and nuclear genes may affect whole-organism metabolic phenotypes. Here, we use crossed combinations of mitochondrial and nuclear lineages of the seed beetle Callosobruchus maculatus and assay metabolic rate under two different temperature regimes. Metabolic rate was affected by an interaction between the mitochondrial and nuclear lineages and the temperature regime. Sequence data suggests that mitochondrial genetic variation has a role in determining the outcome of this interaction. Our genetic dissection of metabolic rate reveals a high level of complexity, encompassing genetic interactions over two genomes, and genotype x genotype x environment interactions. The evolutionary implications of these results are twofold. First, because metabolic rate is at the root of life histories, our results provide insights into the complexity of life-history evolution in general, and thermal adaptation in particular. Second, our results suggest a mechanism that could contribute to the maintenance of nonneutral mtDNA polymorphism..
15. Arnqvist, G., Tuda, M., Sexual conflict and the gender load: correlated evolution between population fitness and sexual dimorphism in seed beetles., Proceedings of the Royal Society B, 277, 1345-1352, 2010.04, 雌雄はゲノムの大半を共有しながらも選択は異なる。性的対立する遺伝子座は理論上、集団内の性的負荷を引き起こす。しかし、遺伝子座内性的対立(ISC)が移行的な進化的状態(性的二型(SD)の進化により対立は急速に解消)なのか、慢性的な適応障害なのか、は現在明らかでない。同じ条件下では、ISCは雌雄において表現される形質の集団適応度とSDの相関進化として現れるはずだ。そこで同じ飼育環境に適応したマメゾウムシの異なる実験室集団間で適応度とSDを比較しISCの効果を試験した。重要な生活史形質である幼生発育期間のSDは適応度と正の関係があり、これは集団適応度と発育期間の相関進化(雌で正、雄で負)によった。雌雄間の遺伝的結合を緩めることで雌雄がそれぞれの異なる適応度ピークへと近づいたと言える。
Although males and females share much of the same genome, selection is often distinct in the two sexes. Sexually antagonistic loci will in theory cause a gender load in populations, because sex-specific selection on a given trait in one sex will compromise the adaptive evolution of the same trait in the other sex. However, it is currently not clear whether such intralocus sexual conflict (ISC) represents a transient evolutionary state, where conflict is rapidly resolved by the evolution of sexual dimorphism (SD), or whether it is a more chronic impediment to adaptation. All else being equal, ISC should manifest itself as correlated evolution between population fitness and SD in traits expressed in both sexes. However, comparative tests of this prediction are problematic and have been unfeasible. Here, we assess the effects of ISC by comparing fitness and SD across distinct laboratory populations of seed beetles that should be well adapted to a shared environment. We show that SD in juvenile development time, a key life-history trait with a history of sexually antagonistic selection in this model system, is positively related to fitness. This effect is due to a correlated evolution between population fitness and development time that is positive in females but negative in males. Loosening the genetic bind between the sexes has evidently allowed the sexes to approach their distinct adaptive peaks..
16. Yanagi S, Tuda M, Interaction effect among maternal environment, maternal investment and progeny genotype on life history traits in Callosobruchus chinensis., Functional Ecology, 24, 2, 383-391, 2010.04, 母親の環境条件(前世代の環境preE)に依存して、母親から子への投資量(環境E)が変化するとき、適応度を上げるために子の遺伝子(G)の発現も変化すると予測される。アズキゾウムシにおいて、EとGの遺伝相関の影響を取り除くために近交系の雌を用いて、preEとEに対するGの反応を調べた。高密度(preE)飼育した母親との交配では低密度適応した野外系統の父親の子(G)が、低密度(preE)飼育した母親とでは高密度適応した室内系統の父親の子(G)が、卵サイズ(E)の増大とともに発育期間が急激に短くなり(適応度が上がり)予測を支持した。このような密度依存的な母性効果(preE×E×G交互作用)は、新しい環境における急速な適応進化を可能にする。
1. Transgenerational effects, genetic or non-genetic, affect population dynamics and the evolution of life-history traits. Besides genetic components, the size of gametes (eggs and seeds), simultaneously a parental and progeny character, can mediate environmental condition experienced by a parent. In both animals and arthropods, mothers are known to reduce their egg mass depending on their malcondition.
2. Progeny may also modify their life history traits to increase their own fitness when constrained by maternal investment, which may eventually nullify transgenerational effects on population dynamics and evolution. Such fitness modification by the progeny under new environmental conditions requires phenotypic plasticity interacting with egg mass. We hypothesize that different selective environments should produce inter-population genetic diversification of the response to maternal investment on each egg, which would be detected as a paternal genotype x environment x previous (i.e. maternal) environment (G x E x preE) interaction in progeny fitness.
3. To evaluate the contribution of maternal non-genetic resource and the genetic component separately, we used an inbred-isofemale-line approach to eliminate the influence of the genetic correlation between egg mass and other life history traits, in the adzuki bean beetle, Callosobruchus chinensis. The females were reared at either high or low densities to generate variability in egg resources. To test the additive or interactive effect of genotype, non-genetic egg resources, and maternal environment on the life history traits of the progeny, they were crossed with males from laboratory and wild strains that had been subjected to different levels of population density.
4. The G x E x preE interaction effect was detected on the correlation structure between egg mass and development time: In the offspring of mothers reared at low density, the negative correlation between egg mass and development time was higher with lab strain fathers, whereas in the offspring of mothers reared at high density, the negative correlation was higher with the wild strain fathers.
5. Our results indicate a genetic difference in the response of development time but not of adult mass to environmental variation in egg mass. Such density-dependent enhancement of maternal effects may destabilize population dynamics and accelerate evolution..
17. Ayabe, Y., Tuda, M., Mochizuki, A. , Benefits of repeated mine trackings by a parasitoid when the host leafminer has a tortuous feeding pattern., Animal Behaviour, 76 (6), 1795-1803, 2008.12.
18. Kergoat, G.J., Silvain, J.-F., Delobel, A., Tuda, M., Anton, K.-W., Defining the limits of taxonomic conservatism in host-plant use for phytophagous insects: Molecular systematics and evolution of host-plant associations in the seed-beetle genus Bruchus Linnaeus (Coleoptera: Chrysomelidae: Bruchinae)., Molecular Phylogenetics and Evolution, 43(1), 251-269, 2007.04.
19. Kergoat, G.J., Silvain, J.-F., Buranapanichpan S., Tuda, M., When insects help to resolve plant phylogeny: Evidence for a paraphyletic genus Acacia from the systematics and host-plant range of their seed-predators., Zoologica Scripta, 36 (2), 143-152, 2007.01.
20. Tuda, M., Ronn, J., Buranapanichpan, S., Wasano, N., Arnqvist, G., Evolutionary diversification of the bean beetle genus Callosobruchus (Coleoptera: Bruchidae): traits associated with stored-product pest status., Molecular Ecology, 15(12): 3541-3551, 2006.10.
21. Tuda, M., Matsumoto, T., Itioka, T., Ishida, N., Takanashi, M., Ashihara, W., Kohyama, M. and Takagi, M., Climatic and inter-trophic effects detected in 10-year population dynamics of biological control of the arrowhead scale by two parasitoids in southwestern Japan., Population Ecology, 48(1), 59-70, 2006.01.
22. M. Tuda, M. Shimada, Complexity, evolution and persistence in host-parasitoid experimental systems, with Callosobruchus beetles as the host., Advances in Ecological Research, 10.1016/S0065-2504(04)37002-9, 37, 37-75, 37, 37-75, 2005.01.
23. Tuda, M., Wasano, N., Kondo, N., Horng, S.-B., Chou, L.-Y. and Tateishi, Y., Habitat-related mtDNA polymorphism in a stored-bean pest Callosobruchus chinensis (Coleoptera: Bruchidae)., Bulletin of Entomological Research, 10.1079/BER2003277, 94, 1, 75-80, 94(1), 75-80, 2004.01.
24. Tuda, M., Shima, K., Johnson, C. D. and Morimoto, K., Establishment of Acanthoscelides pallidipennis (Coleoptera: Bruchidae) feeding in seeds of the introduced legume Amorpha fruticosa, with a new record of its Eupelmus parasitoid in Japan., Applied Entomology and Zoology, 36, 3, 269-276, 36 (3), 269-276, 2001.01.
25. Tuda, M., Chou, L.-Y., Niyomdham, C., Buranapanichpan, S. and Tateishi, Y., Ecological factors associated with pest status in Callosobruchus (Coleoptera: Bruchidae): high host specificity of non-pests to Cajaninae (Fabaceae)., Journal of Stored Products Research, 10.1016/j.jspr.2004.09.003, 41, 1, 31-45, 41(1), 31-45, 2005.01.
26. M. Tuda, M.B. Bonsall, Evolutionary and population dynamics of host-parasitoid interactions., Researches on Population Ecology, 10.1007/PL00011985, 41, 1, 81-91, 41(1),81-91, 1999.01.
27. M. Tuda, M. Shimada, Developmental schedules and persistence of experimental host-parasitoid systems at two different temperatures, Oecologia, 103(3),283-291, 1995.01.
Works, Software and Database
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1. Fukuda K, Tuda M, Mechanism of stable polymorphism of antennal segments number: Trade-off between pre- and post-copulatory fitness in a seed beetle species, XXV International Congress of Entomology, 2016.09.
2. Tuda M, Aung TL, Lwin TH, Kagoshima K, Mori K, Tashiro K, Effect of atmospheric CO2 rise on population size, development and gene expression is different between populations of a seed beetle, XXV International Congress of Entomology, 2016.09.
3. Takagi M, Nakahira K, Tuda M, Biological control of alfalfa weevil under unstable paddy field environment in Japan, XXV International Congress of Entomology, 2016.09.
4. Tuda M, Tani S, Iwase S, Saeki Y, Mori K, Tashiro K, Host-plant and genetic effects on herbivore's fitness and gene expression, The 31st Annual Meeting of the Society of Population Ecology, 2015.10.
5. Saeki Y, Sugawara Y, Tuda M, Switzer PV, Effect of foraging behavior on correlates of dispersal ability in male and female Japanese beetles, 52nd Annual Conference of the Animal Behavior Society, 2015.06.
6. Tuda M, Host-plant change and its mechanism in invasive pest beetles., Symposium on invasive insects: current trends and future directions in research, 2015.02.
7. Midori Tuda, Than Lin Aung, Kumiko Kagoshima, Yasufumi Nakamichi, Eric Wajnberg, Host-parasitoid population dynamics and individual behavior under environmental CO2 rise or species invasion., Netherlands-Japan Seminar on Parasitoid Biology, 2014.08.
8. Than Lin Aung, 津田 みどり, Effect of environmental CO2 concentration on host and parasitoid population dynamics: Is it predictable based on intraspecific competition type?, Annual Meeting of the Society of the Population Ecology, 2013.10.
9. Saeki Y, Tuda M, Crowley P, The size-number trade-off in clonal broods of a parasitic wasp: Responses to the amount and timing of resource availability., Annual Meeting of Society of Population Ecology, 2012.10.
10. Tuda M, Nakamichi Y, Linking community dynamics to population and individual behavior., Second Entomophagous Insects Conference, 2011.06, Three-species systems allow an understanding of irregular, complex population dynamics of multiple species assemblages, with emerging effects of indirect interactions. We focused on a laboratory system consisting of a bruchine species Callosobruchus chinensis as a host and two parasitoids, a chalcid Anisopteromalus calandrae and a braconid Heterospilus prosopidis, with each species introduced sequentially.
With a parameterized semi-mechanistic model, we found the introduction of a second parasitoid (H. prosopidis) destabilized the dynamics of host-parasitoid (A. calandrae) interaction towards chaos. Comparison of parameters before and after the introduction indicated that the parameter that was altered by the introduction was solely the mutual interference in A. calandrae. Finally, to confirm the parameter change detected at the population level, we show our behavioral observation through CCD video camera of the interference between A. calandrae females with a H. prosopidis female when parasitizing their common host..
Membership in Academic Society
  • The Molecular Biology Society of Japan
  • Entomological Society of America
  • International Organisation for Biological Control
  • Japan ICIPE Association
  • Entomological Society of Japan
  • Society for the Study of Evolution
  • Society of Evolutionary Studies, Japan
  • Society of Population Ecology
  • Ecological Society of Japan
  • Japanese Society of Applied Entomology and Zoology
  • Japanese Society for Mathematical Biology
Educational Activities
Graduate courses and laboratory courses for insect natural enemies and biological control

"Dictionary for Ecology", "Introduction to Ecology"
Other Educational Activities
  • 2006.01.
  • 2004.01.
Professional and Outreach Activities
JICA training course for 'Basic Molecular Biology' (lecture and excercises), 2017.9.12-15.、

Invited lectures:

Multiple-species chaos: time-series analysis on 1 host-2 parasitoid laboratory systems by mechanistic nonlinear model. 2002.10.23. IV Hakata International Symposium on Chaos and Nonlinear Time-series

Relation between population and evolutionary dynamics of host-parasitoid system. Joint Research Project for Regional Ecosystems "Interspecific interactions and space"

Effect of winter temperature on biological control system: case study on 2 introduced parasitoids for control of citrus pest, the arrowhead scale, Unaspis yanonensis. 1999.11.27.,IGBP/GAIM meeting.