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(Faculty Division of Natural Sciences Research Group of Biological Sciences)｜Researchers' Profile Teacher performance management system

YUSA Yoichi

Faculty Division of Natural Sciences Research Group of Biological SciencesProfessor
Graduate School of Humanities and SciencesDean, Graduate School of Humanities and Sciences
Last Updated :2025/06/13

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Profile Information

  • Name (Japanese)

    Yusa

  • Name (Kana)

    Yoichi

Degree

  • Science, Kyoto University

Research Areas

  • Environmental science/Agricultural science, Conservation science (plants)
  • Life sciences, Evolutionary biology
  • Life sciences, Ecology and environmental science

Research History

  • 2011 - Present, Nara Women's University, Professor
  • 2007 - 2011, Nara Women's University, 准教授
  • 2003 - 2007, Nara Women's University, Associate Professor
  • 2001 - 2003, National Agricultural Research Center for Kyushu Okinawa Region, Senior Researcher
  • 1996 - 2001, Kyushu National Agricultural Experiment Station, Researcher

Education

  • 1995, Kyoto University, 理学研究科, 動物学専攻, Japan

Media Coverage

  • 《こぼれ話63》スクミリンゴガイの被害軽減へ捕獲器と誘引剤を開発, 生物系特定産業技術研究支援センター, 25 Mar. 2025, Internet, 49456494, url
    対象リソースIRI
  • スクミリンゴガイの防除とイネの被害回避 生態に基づく対策が有効, Myself, 農業共済新聞, 05 Mar. 2025, Paper, 49456494, rm:research_project_id
    対象リソースIRI
  • ジャンボタニシ捕獲器開発 佐賀・みやき町のプラスチック製造「大栄工業」が奈良女子大学と共同で, 佐賀新聞, Jul. 2022, Paper, 12113340, rm:research_project_id
    対象リソースIRI

■Ⅱ．研究活動実績

Published Papers

  • Refereed, Journal of Evolutionary Biology, Oxford University Press (OUP), The effects of parasitism on sex allocation of a hermaphroditic acorn barnacle, Masami M Tamechika; Hiroyuki Yamada; Shigeho Ijiri; Yoichi Yusa, Abstract

    Sex allocation theory predicts the adaptive allocation of resources to male versus female reproduction in simultaneous hermaphrodites in response to individual characteristics or environmental factors. Because parasites uptake resources from their hosts, their presence could affect the sex allocation of the hosts. We investigated the effects of infestation status and infestation intensity by the rhizocephalan barnacle Boschmaella japonica on reproduction, including sex allocation, of the host intertidal barnacle Chthamalus challengeri. Feeding activity was also examined as a factor related to resource intake. Both male and female reproductive investment decreased with increasing parasite infestation, and the sex allocation of large-infested hosts was more male-biased than that of large uninfested hosts. Moreover, in contrast to the model prediction that male investment does not change under resource limitation, male investment decreased in infested hosts whose resources were taken by parasites. This reduction in male investment could be explained by changes in mating group size, since infested hosts have shorter penises and consequently are able to access fewer mating partners., 28 Jan. 2025, Scientific journal, 10.1093/jeb/voaf007
    URLDOI URL
  • Refereed, Comparative Biochemistry and Physiology Part D: Genomics and Proteomics, Elsevier BV, Transcriptomic analysis of sexually dimorphic cypris larvae of the rhizocephalan barnacle Peltogasterella gracilis, Asami Kajimoto; Kenji Toyota; Tsuyoshi Ohira; Yoichi Yusa, Dec. 2024, 52, 101342, 101342, Scientific journal, 10.1016/j.cbd.2024.101342
    DOI URL
  • Refereed, Ecosphere, Wiley, Trait‐mediated indirect effect involving a chain of learning in agroecosystems, Haruka Uehara; Yoichi Yusa, Abstract

    An increase in predation risk triggers a trait response of prey, which alters the interactions between the prey and other species, ultimately affecting other species in the ecosystem. Such predator‐driven trait‐mediated indirect effects (TMIEs) may have been shaped by long‐term evolutionary processes involving the organisms involved, but learning may also be important, especially in contemporary ecosystems experiencing repeated biological invasions. The apple snail Pomacea canaliculata is an important introduced pest of rice, Oryza sativa. Recently, the carrion crow Corvus corone has been found to prey on this species only in some areas, suggesting that learning is involved in this predation. In addition, apple snails can learn to escape from predators and exhibit predator‐specific responses. Thus, the “chain of learning” by the crow and the snail may shape novel TMIEs in the rice ecosystem. We conducted field and mesocosm experiments to test this hypothesis. In the field experiment, we simulated predation by crows in rice fields and investigated the behavior of apple snails. The snails exhibited escape behaviors in response to the simulated predation, and both the proportion of individuals showing the escape response and the degree of escape response were greater in fields with predation by crows than those without predation. In the mesocosm experiment, apple snails from fields with and without predation by crows were separately introduced into mesocosms simulating rice fields, and the behaviors of the snails and the number of remaining rice plants were recorded for 16 days at three levels of predation risk (daily, every 4 days, or no predation). Both the presence/absence of predation in the collection fields and simulated predation affected the escape responses of the snails. Moreover, damage to rice was more severe in mesocosms containing snails from fields without predation than those containing snails from fields with predation. These results suggest that the “chain of learning” causes TMIEs in agroecosystems., 07 Nov. 2024, 15, 11, Scientific journal, 10.1002/ecs2.70046
    URLDOI URL
  • Refereed, Biological Journal of the Linnean Society, Oxford University Press (OUP), Labile sex allocation and sex ratio in the androdioecious barnacle Octolasmis unguisiformis, Hendry Wijayanti; Kota Sawada; Keiko Yasuda; Yoichi Yusa, Abstract

    Theoretical models predict that the sex allocation of hermaphrodites is affected by the number of individuals who can donate sperm to each other [mating group size (MGS)]. However, theory does not make clear predictions for solitary hermaphrodites (i.e. MGS = 1). Moreover, few empirical studies exist on the sex allocation of hermaphrodites coexisting with males (androdioecy). We studied male function (testis and seminal vesicle volumes), female function (ovary volume), sex allocation [male/(male + female functions)], and the male-to-hermaphrodite ratio in the androdioecious barnacle Octolasmis unguisiformis, with hermaphrodites carrying dwarf males. We analysed the effects of MGS on these traits separately for MGS 1 vs. 2 or larger (i.e., whether hermaphrodites are solitary or gregarious) and for MGS 2–4. The male function of mature hermaphrodites presented a positive relationship with MGS in both MGS 1 vs. 2 or larger and MGS 2–4, and female function presented a negative relationship with MGS when comparing MGS 1 vs. 2 or larger. Moreover, the sex allocation of hermaphrodites was positively related to MGS in the analyses of both MGS 1 vs. 2 or larger and MGS 2–4. Remarkably, we found many ‘hermaphrodites’ lacking sperm in MGS 1, suggesting that they are functional females. In addition, more dwarf males per hermaphrodite were present in small MGS. These results generally agreed with the theoretical predictions and revealed a highly plastic sexual system of this barnacle., 01 Nov. 2024, 143, 3, Scientific journal, 10.1093/biolinnean/blae083
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  • Marine Biology, Springer Science and Business Media LLC, Heterogeneous shell growth of the neustonic goose barnacle Lepas anserifera, Hiromi K. Watanabe; Yukiko Nagai; Saburo Sakai; Genki Kobayashi; Luna Yamamori; Noriko Tada; Tatsu Kuwatani; Haruka Nishikawa; Takuto Horigome; Haruka Uehara; Yoichi Yusa, Abstract

    Floating materials of both natural and anthropogenic origin affect marine ecosystems and human economic activities. Although the tracking of floating materials is important to manage the economic risks, it is difficult to trace them back to the events of origin, such as tsunamis and underwater volcanic eruptions. The gooseneck barnacle Lepas anserifera, a rapid colonizer in pelagic environments, is a potential “natural logger” of floating materials. In this study, we performed temperature-controlled culture experiments and growth line staining in the laboratory to quantify the growth increments of shells (scutum and tergum) consisting the capitulum of L. anserifera separately, and to examine the effects of the temperature on their growth. Following calcein staining, the growth lines of L. anserifera were visualized under a fluorescent microscope, and gross (capitular length and width) and individual (scutum and tergum) shell growth were compared. Shells grew in twice as much in the capitular length direction than in the capitular width direction owing to the larger growth increases in the scutum than in the tergum. Growth increments were unaffected by temperatures in the range from 20°C to 30°C, although the growth appeared to slow down in September and October compared with August. The stable oxygen isotope composition (δ18O) of the shells represented the water temperature as previously known, and the present results showed that 18O enriched in scutum than tergum in most cases. Further understanding for the biomineralization process of barnacles is required for the precise application of environmental proxies in barnacle shells., 12 Jul. 2024, 171, 8, Scientific journal, 10.1007/s00227-024-04481-8
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  • Refereed, Crustacean Research, Carcinological Society of Japan, New host crab Macrophthalmus (Macrophthalmus) convexus Stimpson, 1858 of the endangered pedunculate barnacle Octolasmis unguisiformis Kobayashi & Kato, 2003 (Lepadomorpha: Poecilasmatidae) in Amami Oshima Island, Japan, Hendry Wijayanti; Toshihiko Yonezawa; Keiji Wada; Mika Kitazume; Yoichi Yusa, 19 Apr. 2024, 53, 45, 52, Scientific journal, 10.18353/crustacea.53.0_45
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  • Refereed, Journal of Ethology, Springer Science and Business Media LLC, Dropping of apple snails (Pomacea canaliculata) by carrion crows (Corvus corone), Haruka Uehara; Masanori Yoshimura; Yoichi Yusa, 23 Feb. 2024, Scientific journal, 10.1007/s10164-024-00808-6
    URLDOI URL
  • 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
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  • Refereed, Journal of Crustacean Biology, Oxford University Press (OUP), Variations in life cycle and seasonal sex ratio in the rhizocephalan Peltogasterella gracilis (Boschma, 1927) (Cirripedia: Rhizocephala: Peltogasterellidae), Asami Kajimoto; Jens T Høeg; Kenji Kato; Yoichi Yusa, Abstract

    Most individuals of the rhizocephalan Peltogasterella gracilis (Boschma, 1927) produce only male (larger) or female (smaller) offspring, but some mixed-sex broods appear in autumn. Such variability may be an adaptation to the seasonally changing availability of hosts (for female larvae) and conspecific females (for male larvae), but details of the seasonal variation in the sex ratio and its ultimate causes have not been fully studied in P. gracilis. We studied the life cycle, host availability, and seasonal sex-ratio variation in P. gracilis by samplings from spring to autumn in 2017–2020 in Otaru, and additionally from winter to spring of 2007 in Oshoro Bay, Hokkaido, northern Japan. We measured its prevalence on the hermit crab Pagurus lanuginosus De Haan, 1849, the number of males per externa, the proportion of externae brooding different embryonic stages, and embryo size that are linked to sex. The prevalence was about 20% in most of the sampling period. The number of males per externa was 0.01–0.74 in June 2018–2020, but increased in later months to nearly 1.0. Eyed embryos and nauplii before hatching were common from June or July to September, but they were rare in other seasons. Female embryos were observed in all sampling periods, but male embryos were not found in July or August, by which time most females already have males implanted within their receptacles. It is suggested that P. gracilis releases both female and male larvae according to the availability of unparasitized hosts and of virgin externae, respectively., 01 Dec. 2022, 42, 4, Scientific journal, 10.1093/jcbiol/ruac057
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  • Refereed, Journal of Theoretical Biology, Elsevier BV, Evolutionary game of life-cycle types in marine benthic invertebrates: Feeding larvae versus nonfeeding larvae versus direct development, Yoh Iwasa; Yoichi Yusa; Sachi Yamaguchi, Many marine invertebrates have a benthic adult life with planktonic long feeding larval stages (planktotrophy). In other species, planktonic larvae do not eat, and after a rather short period, they settle and initiate their benthic stages (lecithotrophy). Still other species skip planktonic larval stages altogether, and adults produce benthic offspring (direct development). In this paper, we develop an evolutionary game among different life-cycle types and examine the conditions for each life-cycle type to win in a seasonal environment. The growth rate and mortality of benthic individuals are the same among all three life-cycle types, the local habitat (patches) for benthic individuals have a finite longevity, and adults may engage in a limited dispersal just before breeding. Planktotrophy evolves if the planktonic stages are more efficient in terms of biomass gain than benthic life. Otherwise, lecithotrophy or direct development should evolve. Among them, direct development is more advantageous than lecithotrophy if the cost of having planktonic larvae is large, the habitat for benthic individuals is stable, and adults engage in some dispersal., Jan. 2022, 537, 111019, 111019, Scientific journal, True, 10.1016/j.jtbi.2022.111019
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  • Refereed, Organisms Diversity & Evolution, Phylogeny and evolution of functional chloroplast retention in sacoglossan sea slugs (Gastropoda: Heterobranchia), Yu Hirokane; Ayaka Miyamoto; Jun Kitaura; Rie Nakano; Yayoi M. Hirano; Masako Kawane; Yoichi Yusa, Nov. 2021, 1, 11, Scientific journal
  • Refereed, Journal of Theoretical Biology, Elsevier BV, Evolution of life cycle dimorphism: An example of sacoglossan sea slugs, Sachi Yamaguchi; Yoichi Yusa; Yoh Iwasa, Sep. 2021, 525, 110760, 110760, Scientific journal, 10.1016/j.jtbi.2021.110760
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  • Refereed, Jun. 2021
  • Refereed, Molluscan Research, Extremely short embryonic period of the intertidal pulmonate limpet Siphonaria sirius (Pilsbry, 1895), Yoko Wada; Yoichi Yusa, Jun. 2021, 41, 3, 235, 242, Scientific journal
  • Refereed, Applied Entomology and Zoology, Predation by the carrion crow Corvus corone (Passeriformes: Corvidae) on the apple snail Pomacea canaliculata (Architaenioglossa: Ampullariidae) in different locations in Japan, Haruka Uehara; Hiroshi Murakami; Yoichi Yusa, May 2021, 56, 385, 392, Scientific journal
  • Refereed, May 2021, 63, 151, 154, Scientific journal
  • Refereed, Current Biology, Elsevier BV, Extreme autotomy and whole-body regeneration in photosynthetic sea slugs, Sayaka Mitoh; Yoichi Yusa, Mar. 2021, 31, 5, R233, R234, Scientific journal, 10.1016/j.cub.2021.01.014
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  • Refereed, Oecologia, Adaptive significance of light and food for a kleptoplastic sea slug: implications for photosynthesis, H Shiroyama; S Mitoh; TY Ida; Y Yusa, Oct. 2020, 194, 455, 463
  • Refereed, Journal of Experimental Marine Biology and Ecology, Seasonal utilization patterns of two snail hosts by the epizoic limpet Lottia tenuisculpta (Gastropoda: Patellogastropoda), R Nakayama; T Nakano; Y Yusa, Oct. 2020, 530, 151402
  • Refereed, Journal of Crustacean Biology, Life cycles of the rhizocephalan Boschmaella japonica Deichmann & Høeg, 1990 (Cirripedia: Chthamalophilidae) and its host barnacle Chthamalus challengeri Hoek, 1883 (Cirripedia: Chthamalidae), M Yabuta; JT Høeg; S Yamato; Y Yusa, Jun. 2020
  • Refereed, Molecular biology reports, Microsatellite DNA markers applicable to paternity inference in the androdioecious gooseneck barnacle Octolasmis warwickii (Lepadiformes: Poecilasmatidae), M Kobayashi; Y Yusa; M Sekino, May 2020, 47, 4885, 4890
  • Ecology and Evolution, Different effects of mating group size as male and as female on sex allocation in a simultaneous hermaphrodite, MM Tamechika; K Matsuno; S Wada; Y Yusa, Feb. 2020, 10, 5, 2492, 2498
  • Journal of Molluscan Studies, Effect of inbreeding on sex ratio in the apple snail Pomacea canaliculata, N Kumagai; Y Yusa, Aug. 2019, 85, 3, 348, 353
  • Transitions between sexual systems, Hermaphrodites, dwarf males, and females: evolutionary transitions of sexual systems in barnacles, Y Yusa, Mar. 2019, 221, 245
  • Not Refereed, Ecological Indicators, Elsevier B.V., Effects of temperature and red tides on sea urchin abundance and species richness over 45 years in southern Japan, Shun-Ichi Ohgaki; Tetsuya Kato; Naomasa Kobayashi; Hidetomo Tanase; Naoki H. Kumagai; So Ishida; Tomoyuki Nakano; Yoko Wada; Yoichi Yusa, Jan. 2019, 96, 1, 684, 693, Scientific journal, 10.1016/j.ecolind.2018.03.040
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  • Not Refereed, ZOOLOGICAL STUDIES, Direct Growth Measurements of Two Deep-sea Scalpellid Barnacles, Scalpellum stearnsii and Graviscalpellum pedunculatum, Yoichi Yusa; Natsumi Yasuda; Tomoko Yamamoto; Hiromi Kayama Watanabe; Takuo Higashiji; Atsushi Kaneko; Kazuki Nishida; Jens T. Hoeg, Jun. 2018, 57, article 29, Scientific journal, 10.6620/ZS.2018.57-29
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  • Not Refereed, GENETICA, Evidence of oligogenic sex determination in the apple snail Pomacea canaliculata, Yoichi Yusa; Natsumi Kumagai, Jun. 2018, 146, 3, 265, 275, Scientific journal, 10.1007/s10709-018-0017-z
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  • Not Refereed, Organisms Diversity and Evolution, Springer Verlag, When dwarf males and hermaphrodites copulate: first record of mating behaviour in a dwarf male using the androdioecious barnacle Scalpellum scalpellum (Crustacea: Cirripedia: Thoracica), Niklas Dreyer; Jens T. Høeg; Martin Heß; Stefan Sørensen; Uwe Spremberg; Yoichi Yusa, 01 Mar. 2018, 18, 1, 115, 123, Scientific journal, 10.1007/s13127-017-0349-z
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  • Not Refereed, 2018, 76, 79, 85, 10.18941/venus.76.1-4_79
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  • Not Refereed, 2018, 184, 4, 999, 1023, 10.1093/zoolinnean/zly018
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  • Not Refereed, 2018, 124, 4, 776, 788
  • Not Refereed, MARINE BIOLOGY, Effects of a crustacean parasite and hyperparasite on the Japanese spiny oyster Saccostrea kegaki, Noriko Yasuoka; Yoichi Yusa, Nov. 2017, 164, 11, Article 217, Scientific journal, 10.1007/s00227-017-3250-6
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  • Not 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
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  • Not Refereed, Plankton and Benthos Research, Plankton Society of Japan, Direct evidence of bi-directional sex change in natural populations of the oysters Saccostrea kegaki and S. Mordax, Noriko Yasuoka; Yoichi Yusa, 2017, 12, 1, 78, 81, 10.3800/pbr.12.78
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  • Not Refereed, CRUSTACEANA, LARVAL DEVELOPMENT OF THE EPIZOIC BARNACLE OCTOLASMIS UNGUISIFORMIS KOBAYASHI & KATO, 2003 (CIRRIPEDIA, PEDUNCULATA), H. Wijayanti; Y. Yusa; R. Kado, 2017, 90, 3, 321, 336, Scientific journal, 10.1163/15685403-00003654
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  • Not Refereed, Sessile Organisms, THE SESSILE ORGANISMS SOCIETY OF JAPAN, Diversity of sexual expressions in barnacles, Yusa Yoichi, As first discovered by Darwin, barnacles (Cirripedia: Thoracica) show diverse sexual systems including simultaneous hermaphroditism, dioecy (separate sexes), and androdioecy (coexistence of males and hermaphrodites). The males are always much smaller than their hermaphrodite or female mates (hence called dwarf males). Here I review recent theoretical and empirical studies that address causes of the diverse sexual systems in barnacles. The size of mating groups (or more accurately, the average number of matings from other hermaphrodites a female-acting hermaphrodite is expected to accept) is identified as the most important environmental factor responsible for the evolutionary transitions of sexual systems in barnacles. I suggest that barnacles offer both theoretical and empirical model systems for understanding the evolution of sexual systems in animals., 2017, 34, 1, 13, 18, 10.4282/sosj.34.13
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  • Not Refereed, JOURNAL OF MOLLUSCAN STUDIES, Effects of size and gregariousness on individual sex in a natural population of the Pacific oyster Crassostrea gigas, Noriko Yasuoka; Yoichi Yusa, Nov. 2016, 82, 485, 491, Scientific journal, 10.1093/mollus/eyw020
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  • Not Refereed, JOURNAL OF MOLLUSCAN STUDIES, Survival, growth and reproduction of the invasive apple snail Pomacea canaliculata in an irrigation canal in southern Japan, Kazuhiro Yoshida; Yoichi Yusa; Yoko Yamanishi; Keiichiro Matsukura; Takashi Wada, Nov. 2016, 82, 600, 602, 10.1093/mollus/eyw024
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  • Not Refereed, BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, Sex determination in the androdioecious barnacle Scalpellum scalpellum (Crustacea: Cirripedia), Jens T. Hoeg; Yoichi Yusa; Niklas Dreyer, Jun. 2016, 118, 2, 359, 368, Scientific journal, 10.1111/bij.12735
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  • Not Refereed, BIOLOGICAL BULLETIN, Plastic Sexual Expression in the Androdioecious Barnacle Octolasmis warwickii (Cirripedia: Pedunculata), Hendry Wijayanti; Yoichi Yusa, Feb. 2016, 230, 1, 51, 55, Scientific journal, 10.1086/BBLv230n1p51
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  • Not Refereed, DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, Effects of food availability on growth and reproduction of the deep-sea pedunculate barnacle Heteralepas canci, Natsumi Yasuda; Norio Miyamoto; Yoshihiro Fujiwara; Tomoko Yamamoto; Yoichi Yusa, Feb. 2016, 108, 53, 57, Scientific journal, 10.1016/j.dsr.2015.12.008
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  • Not Refereed, ZOOLOGICAL STUDIES, Host Relation, Size and Reproduction in the Burrowing Barnacle Trypetesa lampas (Hancock) (Crustacea Cirripedia Acrothoracica), Sofie K. D. Nielsen; Jens T. Hoeg; Yoichi Yusa, 2016, 55, 14, 1, 10, Scientific journal, 10.6620/ZS.2016.55-14
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  • Not Refereed, MALACOLOGIA, VARIATION IN THE SEX RATIO OF APPLE SNAILS (POMACEA SPP.) IN THEIR NATIVE RANGE, Yoichi Yusa; Jun Kitaura; Nestor J. Cazzaniga, 2016, 59, 2, 239, 245, Scientific journal, 10.4002/040.059.0205
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  • Not Refereed, MOLECULAR PHYLOGENETICS AND EVOLUTION, The origins and evolution of dwarf males and habitat use in thoracican barnacles, Hsiu-Chin Lin; Jens T. Hoeg; Yoichi Yusa; Benny K. K. Chan, Oct. 2015, 91, 1, 11, Scientific journal, 10.1016/j.ympev.2015.04.026
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  • Not Refereed, JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, Prey density affects strengths of density- and trait-mediated indirect interactions of predators on an algal community, Yoko Wada; Keiji Iwasaki; Yoichi Yusa, Jul. 2015, 468, 67, 73, Scientific journal, 10.1016/j.jembe.2015.03.015
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  • Not Refereed, INVERTEBRATE BIOLOGY, Dwarf males in the epizoic barnacle Octolasmis unguisiformis and their implications for sexual system evolution, Kota Sawada; Ryuta Yoshida; Keiko Yasuda; Sachi Yamaguchi; Yoichi Yusa, Jun. 2015, 134, 2, 162, 167, Scientific journal, 10.1111/ivb.12083
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  • Not Refereed, MARINE BIOLOGY, Phototaxis of sacoglossan sea slugs with different photosynthetic abilities: a test of the 'crawling leaves' hypothesis, Ayaka Miyamoto; Atsushi Sakai; Rie Nakano; Yoichi Yusa, Jun. 2015, 162, 6, 1343, 1349, Scientific journal, 10.1007/s00227-015-2673-1
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  • Not Refereed, MALACOLOGIA, INSIGHTS FROM AN INTEGRATED VIEW OF THE BIOLOGY OF APPLE SNAILS (CAENOGASTROPODA: AMPULLARIIDAE), Kenneth A. Hayes; Romi L. Burks; Alfredo Castro-Vazquez; Philip C. Darby; Horacio Heras; Pablo R. Martin; Jian-Wen Qiu; Silvana C. Thiengo; Israel A. Vega; Takashi Wada; Yoichi Yusa; Silvana Burela; M. Pilar Cadierno; Juan A. Cueto; Federico A. Dellagnola; Marcos S. Dreon; M. Victoria Frassa; Maximiliano Giraud-Billoud; Martin S. Godoy; Santiago Ituarte; Eduardo Koch; Keiichiro Matsukura; M. Yanina Pasquevich; Cristian Rodriguez; Lucia Saveanu; Maria E. Seuffert; Ellen E. Strong; Jin Sun; Nicolas E. Tamburi; Maria J. Tiecher; Richard L. Turner; Patricia L. Valentine-Darby; Robert H. Cowie, Apr. 2015, 58, 1-2, 245, 302, Scientific journal, 10.4002/040.058.0209
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  • Not Refereed, JOURNAL OF MOLLUSCAN STUDIES, Antipredator behaviour in response to single or combined predator cues in the apple snail Pomacea canaliculata, Eriko Ueshima; Yoichi Yusa, Feb. 2015, 81, 51, 57, Scientific journal, 10.1093/mollus/eyu057
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  • Not Refereed, BIOLOGICAL INVASIONS, Canal type affects invasiveness of the apple snail Pomacea canaliculata through its effects on animal species richness and waterweed invasion, Akiko Hara; Kenji Hamasaki; Kazuhiro Yoshida; Yoichi Yusa, Jan. 2015, 17, 1, 63, 71, Scientific journal, 10.1007/s10530-014-0703-4
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  • Not Refereed, CRUSTACEANA, DWARF MALES IN THE BARNACLE ALEPAS PACIFICA PILSBRY, 1907 (THORACICA, LEPADIDAE), A SYMBIONT OF JELLYFISH, Y. Yusa; S. Yamato; M. Kawamura; S. Kubota, 2015, 88, 3, 273, 282, Scientific journal, 10.1163/15685403-00003414
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  • Not Refereed, MARINE BIOLOGY RESEARCH, Sexual system of a symbiotic pedunculate barnacle Poecilasma kaempferi (Cirripedia: Thoracica), Sachi Yamaguchi; Sachi Yoshida; Atsushi Kaneko; Kota Sawada; Keiko Yasuda; Yoichi Yusa, Jul. 2014, 10, 6, 635, 640, Scientific journal, 10.1080/17451000.2013.841943
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  • Not Refereed, MARINE BIOLOGY, Relative importance and interactive effects of photosynthesis and food in two solar-powered sea slugs, Ayana Akimoto; Yayoi M. Hirano; Atsushi Sakai; Yoichi Yusa, May 2014, 161, 5, 1095, 1102, Scientific journal, 10.1007/s00227-014-2402-1
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  • Not Refereed, ECOLOGY, Changes in algal community structure via density- and trait-mediated indirect interactions in a marine ecosystem, Yoko Wada; Keiji Iwasaki; Yoichi Yusa, Nov. 2013, 94, 11, 2567, 2574, Scientific journal, 10.1890/12-0725.1
    DOI URL
  • Refereed, INTEGRATIVE AND COMPARATIVE BIOLOGY, Diverse, Continuous, and Plastic Sexual Systems in Barnacles, Yoichi Yusa; Mayuko Takemura; Kota Sawada; Sachi Yamaguchi, Oct. 2013, 53, 4, 701, 712, Scientific journal, 10.1093/icb/ict016
    DOI URL
  • Not Refereed, FRESHWATER BIOLOGY, Patterns of density dependence in growth, reproduction and survival in the invasive freshwater snail Pomacea canaliculata in Japanese rice fields, Kazuhiro Yoshida; Kazuo Hoshikawa; Takashi Wada; Yoichi Yusa, Oct. 2013, 58, 10, 2065, 2073, Scientific journal, 10.1111/fwb.12191
    DOI URL
  • Not Refereed, JOURNAL OF THEORETICAL BIOLOGY, Dwarf males and hermaphrodites can coexist in marine sedentary species if the opportunity to become a dwarf male is limited, Sachi Yamaguchi; Kota Sawada; Yoichi Yusa; Yoh Iwasa, Oct. 2013, 334, 101, 108, Scientific journal, 10.1016/j.jtbi.2013.05.027
    DOI URL
  • Not Refereed, JOURNAL OF HEREDITY, Population Genetics of Sex Determination in Mytilus Mussels: Reanalyses and a Model, Yoichi Yusa; Sophie Breton; Walter R. Hoeh, May 2013, 104, 3, 380, 385, Scientific journal, 10.1093/jhered/est014
    DOI URL
  • Not Refereed, THEORETICAL POPULATION BIOLOGY, Dwarf males, large hermaphrodites and females in marine species: A dynamic optimization model of sex allocation and growth, Sachi Yamaguchi; Kota Sawada; Yoichi Yusa; Yoh Iwasa, May 2013, 85, 49, 57, Scientific journal, 10.1016/j.tpb.2013.02.001
    DOI URL
  • Not Refereed, JOURNAL OF THEORETICAL BIOLOGY, Sexual systems and dwarf males in barnacles: Integrating life history and sex allocation theories, Sachi Yamaguchi; Yoichi Yusa; Kota Sawada; Satoshi Takahashi, Mar. 2013, 320, 1, 9, Scientific journal, 10.1016/j.jtbi.2012.12.001
    DOI URL
  • Not Refereed, NATURWISSENSCHAFTEN, Postembryonic development of the bone-eating worm Osedax japonicus, Norio Miyamoto; Tomoko Yamamoto; Yoichi Yusa; Yoshihiro Fujiwara, Mar. 2013, 100, 3, 285, 289, Scientific journal, 10.1007/s00114-013-1024-7
    DOI URL
  • Not Refereed, Journal of the Marine Biological Association of the United Kingdom, Effects of photosynthesis on the survival and weight retention of two kleptoplastic sacoglossan opisthobranchs, Shoko Yamamoto; Yayoi M. Hirano; Yoshiaki J. Hirano; Cynthia D. Trowbridge; Ayana Akimoto; Atsushi Sakai; Yoichi Yusa, 2013, 93, 1, 209, 215, Scientific journal, 10.1017/S0025315412000628
    DOI URL
  • Not Refereed, 2013, 49, 295, 297
  • Refereed, INTEGRATIVE AND COMPARATIVE BIOLOGY, Sexual Systems and Life History of Barnacles: A Theoretical Perspective, Sachi Yamaguchi; Eric L. Charnov; Kota Sawada; Yoichi Yusa, Sep. 2012, 52, 3, 356, 365, Scientific journal, 10.1093/icb/ics046
    DOI URL
  • Not Refereed, PROTOPLASMA, Effects of chloroplast dysfunction on mitochondria: white sectors in variegated leaves have higher mitochondrial DNA levels and lower dark respiration rates than green sectors, Haruka Toshoji; Tomomi Katsumata; Mari Takusagawa; Yoichi Yusa; Atsushi Sakai, Jul. 2012, 249, 3, 805, 817, Scientific journal, 10.1007/s00709-011-0325-y
    DOI URL
  • Not Refereed, BIOLOGICAL INVASIONS, Predator-driven biotic resistance and propagule pressure regulate the invasive apple snail Pomacea canaliculata in Japan, Yoko Yamanishi; Kazuhiro Yoshida; Noriomi Fujimori; Yoichi Yusa, Jul. 2012, 14, 7, 1343, 1352, Scientific journal, 10.1007/s10530-011-0158-9
    DOI URL
  • Not Refereed, JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, Cypris settlement and dwarf male formation in the barnacle Scalpellum scalpellum: A model for an androdioecious reproductive system, U. Spremberg; J. T. Hoeg; L. Buhl-Mortensen; Y. Yusa, Jul. 2012, 422, 39, 47, Scientific journal, 10.1016/j.jembe.2012.04.004
    DOI URL
  • Not Refereed, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Adaptive evolution of sexual systems in pedunculate barnacles, Yoichi Yusa; Mai Yoshikawa; Jun Kitaura; Masako Kawane; Yuki Ozaki; Shigeyuki Yamato; Jens T. Hoeg, Mar. 2012, 279, 1730, 959, 966, Scientific journal, 10.1098/rspb.2011.1554
    DOI URL
  • Not Refereed, JOURNAL OF ETHOLOGY, Courtship tactics by male Ilyoplax pusilla (Brachyura, Dotillidae), Asami Kasatani; Keiji Wada; Yoichi Yusa; John H. Christy, Jan. 2012, 30, 1, 69, 74, Scientific journal, 10.1007/s10164-011-0296-7
    DOI URL
  • Not Refereed, FRESHWATER BIOLOGY, Indirect interactions in a rice ecosystem: density dependence and the interplay between consumptive and non-consumptive effects of predators, Haruko Yoshie; Yoichi Yusa, Feb. 2011, 56, 2, 302, 310, Scientific journal, 10.1111/j.1365-2427.2010.02497.x
    DOI URL
  • Not Refereed, BIOLOGICAL BULLETIN, Dwarf Males of Octolasmis warwickii (Cirripedia: Thoracica): The First Example of Coexistence of Males and Hermaphrodites in the Suborder Lepadomorpha, Yoichi Yusa; Mayuko Takemura; Katsumi Miyazaki; Tetsuya Watanabe; Shigeyuki Yamato, Jun. 2010, 218, 3, 259, 265, Scientific journal
  • Not Refereed, MARINE BIOLOGY, Effects of temperature and food availability on growth and reproduction in the neustonic pedunculate barnacle Lepas anserifera, Ayano Inatsuchi; Shigeyuki Yamato; Yoichi Yusa, Apr. 2010, 157, 4, 899, 905, Scientific journal, 10.1007/s00227-009-1373-0
    DOI URL
  • Not Refereed, MALACOLOGIA, LEARNED PREDATOR RECOGNITION IN A FRESHWATER SNAIL, POMACEA CANALICULATA, Kahori Aizaki; Yoichi Yusa, 2010, 52, 1, 21, 29, Scientific journal, 10.4002/040.052.0102
    DOI URL
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Life cycle of the apple snail Pomacea canaliculata (Caenogastropoda: Ampullariidae) inhabiting Japanese paddy fields, Kazuhiro Yoshida; Kazuo Hoshikawa; Takashi Wada; Yoichi Yusa, Aug. 2009, 44, 3, 465, 474, Scientific journal, 10.1303/aez.2009.465
    DOI URL
  • Not Refereed, EVOLUTIONARY ECOLOGY RESEARCH, Evolution of dwarf males and a variety of sexual modes in barnacles: an ESS approach, Satoru Urano; Sachi Yamaguchi; Shigeyuki Yamato; Satoshi Takahashi; Yoichi Yusa, Jul. 2009, 11, 5, 713, 729, Scientific journal
  • Not Refereed, JOURNAL OF ETHOLOGY, Field observations of the alarm response to crushed conspecifics in the freshwater snail Pomacea canaliculata: effects of habitat, vegetation, and body size, Kahori Aizaki; Yoichi Yusa, Jan. 2009, 27, 1, 175, 180, Scientific journal, 10.1007/s10164-008-0103-2
    DOI URL
  • Not Refereed, Kyushu plant protection research, Apple snails Pomacea canaliculata escaping from a paddy field into an irrigation canal in South Japan, 2009, 55, 93, 98, 10.4241/kyubyochu.55.93
  • Not Refereed, Endocytobiosis Cell Research, Identification of photosynthetic sacoglossans from Japan, Yamamoto, Y. Y; Yusa, Y; thers, 2009, 19, 112, 119
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Effects of predation on the exotic freshwater snail Pomacea canaliculata (Caenogastropoda: Ampullariidae) by the indigenous turtle Chinemys reevesii (Testudines: Geoemydidae), Haruko Yoshie; Yoichi Yusa, Nov. 2008, 43, 4, 475, 482, Scientific journal, 10.1303/aez.2008.475
    DOI URL
  • Not Refereed, JOURNAL OF THEORETICAL BIOLOGY, Mating group size and evolutionarily stable pattern of sexuality in barnacles, Sachi Yamaguchi; Yoichi Yusa; Shigeyuki Yamato; Satoru Urano; Satoshi Takahashi, Jul. 2008, 253, 1, 61, 73, Scientific journal, 10.1016/j.jtbi.2008.01.025
    DOI URL
  • Not Refereed, Invertebrate Biology, Size-dependent sex allocation and sexual selection in Aplysia kurodai, a hermaphrodite with nonreciprocal mating, Yoichi Yusa, Jun. 2008, 127, 3, 291, 298, Scientific journal, 10.1111/j.1744-7410.2008.00129.x
    DOI URL
  • Not Refereed, JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM, Reproductive ecology of the pedunculate barnacle Scalpellum stearnsii (Cirripedia : Lepadomorpha : Scalpellidae), Yuki Ozaki; Yoichi Yusa; Shigeyuki Yamato; Tohru Imaoka, Feb. 2008, 88, 1, 77, 83, Scientific journal, 10.1017/S0025315408000131
    DOI URL
  • Not Refereed, 2008, 66, 217, 225
  • Not Refereed, AMERICAN MALACOLOGICAL BULLETIN, Causes of variation in sex ratio and modes of sex determination in the Mollusca - an overview, Yoichi Yusa, Dec. 2007, 23, 1-2, 89, 98, Scientific journal, 10.4003/0740-2783-23.1.89
  • Not Refereed, JOURNAL OF MOLLUSCAN STUDIES, A water-borne sex pheromone and trail following in the apple snail, Pomacea canaliculata, Mari Takeichi; Yoshio Hirai; Yoichi Yusa, Aug. 2007, 73, 275, 278, Scientific journal, 10.1093/mollus/eym027
    DOI URL
  • Not Refereed, JOURNAL OF THEORETICAL BIOLOGY, Do tiny males grow up? Sperm competition and optimal resource allocation schedule of dwarf males of barnacles, Sachi Yamaguchi; Yuki Ozaki; Yoichi Yusa; Satoshi Takahashi, Mar. 2007, 245, 2, 319, 328, Scientific journal, 10.1016/j.jtbi.2006.10.009
    DOI URL
  • Not Refereed, Genetics, Nuclear sex-determining genes cause large sex-ratio variation in the apple snail Pomacea canaliculata, Yoichi Yusa, Jan. 2007, 175, 1, 179, 184, Scientific journal, 10.1534/genetics.106.060400
    DOI URL
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Effects of dormant duration, body size, self-burial and water condition on the long-term survival of the apple snail, Pomacea canaliculata (Gastropoda : Ampullariidae), Yoichi Yusa; Takashi Wada; Satoshi Takahashi, Nov. 2006, 41, 4, 627, 632, Scientific journal, 10.1303/aez.2006.627
    DOI URL
  • Not Refereed, BIOLOGICAL INVASIONS, Predatory potential of freshwater animals on an invasive agricultural pest, the apple snail Pomacea canaliculata (Gastropoda : Ampullariidae), in southern Japan, Y Yusa; N Sugiura; T Wada, Mar. 2006, 8, 2, 137, 147, Scientific journal, 10.1007/s10530-004-1790-4
    DOI URL
  • Not Refereed, Heredity, Genetics of sex-ratio variation inferred from parent-offspring regressions and sib correlations in the apple snail Pomacea canaliculata, Y. Yusa, Jan. 2006, 96, 1, 100, 105, Scientific journal, 10.1038/sj.hdy.6800758
    DOI URL
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Decrease in density of the apple snail Pomacea canaliculata (Lamarck) (Gastropoda : Ampullariidae) in paddy fields after crop rotation with soybean, and its population growth during the crop season, T Wada; K Ichinose; Y Yusa; N Sugiura, Aug. 2004, 39, 3, 367, 372, Scientific journal, 10.1303/aez.2004.367
    DOI URL
  • Not Refereed, Kyushu Pl. Prot Res., The Association for Plant Protection of Kyushu, Decrease in density of the apple snail, Pomacea canaliculata (Lamarck) (Gastropoda: Ampullariidae) by tillage and soil puddling., Wada Takashi; Yusa Yoichi; Ichinose Katsuya; Kanno Hiroo; Matsumura Masaya; Arimura Kazuhiro; Urano Satoru; Takahashi Kimiyasu, Mortality of the apple snail, Pomacea canaliculata, caused by tillage or soil puddling was examined in rice fields. Tillage greatly decreased the snail density with ca. 75% mortality when the mean shell height of snails was 20.3 mm (±4.3;S.D.). However, "intensive tillage" using a special rotary cultivator with a smaller rotary pitch, and taking more time than ordinary tillage. had no additional effect on snail mortality. Soil puddling also attained a 67% mortality rate for snails with a mean shell height of 20.4 mm (±5.3:S.D.). When smaller snails (mean shell height: 11.8±5.4 mm) occurred in a field, 68% mortality was attained by tillage plus soil puddling. One of the examples revealed that a density of 4.5 overwintering snails per m2 in a field was finally reduced to 0.3 snails per m2 by tillage plus two occasions of soil puddling. Thus, tillage and soil puddling are good methods for decreasing snail density before rice planting., 2004, 50, 23, 28, 10.4241/kyubyochu.50.23
    DOI URL
  • Not Refereed, Journal of Molluscan Studies, Brood sex ratio in the apple snail Pomacea canaliculata (Gastropoda: Ampullariidae) is determined genetically and not by environmental factors, YUSA Yoichi; Y. Yusa, 2004, 70, 269, 275
  • Not Refereed, Journal of Molluscan Studies, Inheritance of colour polymorphism and the pattern of sperm competition in the apple snail Pomacea canaliculata (Gastropoda: Ampullariidae), YUSA Yoichi; Y. Yusa, 2004, 70, 43, 48
  • Not Refereed, ECOLOGICAL RESEARCH, Alarm response of hatchlings of the apple snail, Pomacea canaliculata (Gastropoda : Ampullariidae), to aqueous extracts of other individuals, K Ichinose; Y Yusa; K Yoshida, Mar. 2003, 18, 2, 213, 219, Scientific journal, 10.1046/j.1440-1703.2003.00548.x
    DOI URL
  • Not Refereed, PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, A snail with unbiased population sex ratios but highly biased brood sex ratios, Y Yusa; Y Suzuki, Feb. 2003, 270, 1512, 283, 288, Scientific journal, 10.1098/rspb.2002.2226
    DOI URL
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Effects of food availability and age on the reproductive effort of the apple snail, Pomacea canaliculata (Lamarck) (Gastropoda : Ampullariidae), GF Estoy; Y Yusa; T Wada; H Sakurai; K Tsuchida, Nov. 2002, 37, 4, 543, 550, Scientific journal, 10.1303/aez.2002.543
    DOI URL
  • Not Refereed, INTERNATIONAL JOURNAL OF PEST MANAGEMENT, Influence of common carp on apple snail in a rice field evaluated by a predator-prey logistic model, K Ichinose; M Tochihara; T Wada; N Suguiura; Y Yusa, Apr. 2002, 48, 2, 133, 138, Scientific journal, 10.1080/09670870110100703
    DOI URL
  • Not Refereed, APPLIED ENTOMOLOGY AND ZOOLOGY, Size and age at first copulation and spawning of the apple snail, Pomacea canaliculata (Gastropoda : Ampullariidae), GF Estoy; Y Yusa; T Wada; H Sakurai; K Tsuchida, Feb. 2002, 37, 1, 199, 205, Scientific journal, 10.1303/aez.2002.199
    DOI URL
  • Not Refereed, JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM, Ecology of a parasitic barnacle, Koleolepas avis: relationship to the hosts, distribution, left-right asymmetry and reproduction, Y Yusa; S Yamato; M Marumura, Oct. 2001, 81, 5, 781, 788, Scientific journal
  • Not Refereed, JOURNAL OF MOLLUSCAN STUDIES, Predation on eggs of the apple snail Pomacea canaliculata (Gastropoda : Ampullariidae) by the fire ant Solenopsis geminata, Y Yusa, Aug. 2001, 67, 275, 279, Scientific journal
  • Not Refereed, 2001, 47, 58, 64, 10.4241/kyubyochu.47.58
  • Not Refereed, Kyushu Pl. Prot Res., The Association for Plant Protection of Kyushu, Predatory potential of the common carp, Cyprinus carpio L., on the apple snail, Pomacea canaliculata (Lamarck), in the field., Yusa Yoichi; Kai Shinichiro; Ando Shunji; Shiozaki Naomi; Wada Takashi, We assessed the predatory potential of the common carp on the apple snail at a low density of carp. We released 1 carp (average body length : 16cm) and 1, 400 snails (average weight 0.12g) in each of 23 m2 plots set in a paddy field without rice in August 2000. Seven days after release, snail density was significantly lower in carp-occupied plots than in carp-free ones. However, in a 1 x 1 m cage set in each plot, which excluded carp, neither density of surface snails nor survival rate was different between carp-occupied and carp-free plots. This indicates that predation by carp was responsible for the reduction of the density of surface snails in carp-occupied plots, rather than the increase in the proportion of snails buried or natural snail mortality in the presence of carp. The average predation rate of a carp was estimated to be 54 snails/day. which was about one-fourth of the rate observed in the laboratory. However, the predation rate in the field was high enough to regard carp as biocontrol agents for the snail, not only in rice fields but also in other freshwater systems., 2001, 47, 69, 72, 10.4241/kyubyochu.47.69
    DOI URL
  • Refereed, Kyushu Pl. Prot Res., The Association for Plant Protection of Kyushu, Influence of habitat differences brought about by envvironmental changes on the densities of adults and eggs of Pomacea canaliculata., Ichinose Katsuya; Wada Takashi; Yusa Yoichi; Kubota Tomijiro, The density of Pomacea canaliculata (Lamarck) with shell lengths > 25 mm and of its egg masses were estimated in three habitats: rice field, canal and river. The mean densities were 3.72 ± 1.31, 2.12 ± 0.90 and 3.20 ± 1.85 snails/m2, respectively: no significant difference was detected by ANOVA. In contrast, the mean densities of egg masses, 1.84 ± 0.40, 0.72 ± 0.24 and 0.39 ± 0.19 eggs/m2, differed significantly between rice field and canal and between rice field and river, though not between canal and river. Correlation of these densities with water depth, current velocity, chemical oxygen demand (COD), and predator fauna (Carassius spp., Zacco temmincki, Procambarus clarki and Potamon dehaani) were examined by Kendall's coefficients of rank correlation. Water depth showed a significant negative correlation with snail density but not with egg density. Depths > 50 cm were likely to reduce both snails and eggs markedly, though neither were significantly correlated with depth. There was no significant correlation with current velocity, although velocities > 50 cm/sec reduced the densities nearly to zero. Both snail and egg densities were positively correlated with COD, indicating that this snail is adapted for more polluted water. Neither density was correlated significantly with the predator fauna. These correlations are discussed with special reference to the life history of the snail in these habitats., Apr. 2000, 46, 46, 78, 84, 10.4241/kyubyochu.46.78
    DOI URL
  • Refereed, Kyushu Plant Protection Research, The Association for Plant Protection of Kyushu, Management of the golden apple snail, Pomacea canaliculata (Lamarck), by drainage and methaldehyde application in direct-sown rice under heavy rainfall conditions., Suzuki Yoshito; Matsumura Masaya; Arimura Kazuhiro; Urano Satoru; Wada Takashi; Yusa Yoichi; Ichinose Katsuya, The effect of a combination of drainage and methaldehyde on feeding damage to directseeded rice by the golden apple snail, Pomacea canaliculata (Lamarck), was tested under conditions of high snail density and heavy rainfall. A 10-day drainage immediately following the wet seeding and subsequent 11-day low-level water management was successful in suppressing the snail damage below an acceptable injury level when methaldehyde granules (10%) were applied at a rate of 4 kg/10 a, 4 days and 10 days after sowing. The analysis of the results of methaldehyde application revealed that the success was due mainly to its effect as feeding arrestant., 2000, 46, 94, 97, 10.4241/kyubyochu.46.94
    DOI URL
  • Refereed, BIOLOGICAL BULLETIN, Cropping of sea anemone tentacles by a symbiotic barnacle, Y Yusa; S Yamato, Dec. 1999, 197, 3, 315, 318, Scientific journal, 10.2307/1542785
    DOI URL
  • PUBLICATIONS OF THE SETO MARINE BIOLOGICAL LABORATORY, Distribution of Two Species of Conchoderma (Cirripedia : Thoracica) over the Body of a Sea Snake, Laticauda semifasciata (Reinwardt), from the Kii Peninsula, Southwestern Japan, Yamato Shigeyuki; Yusa Yoichi; Tanase Hidetomo; Tanase Hidetomo, 25 Dec. 1996, 37, 3, 337, 343, 10.5134/176259
    DOI URL

MISC

  • Not Refereed, 2015, 69, 160, 164
  • Not Refereed, 農林水産省農林水産技術会議事務局研究成果, 超低コスト土地利用型作物生産技術の開発 第6章 暖地2年4作水田輪作地帯 5 暖地二毛作地帯における水田輪作技術の体系化と現地実証(4)忌避材によるスクミリンゴガイの産卵抑制, 田坂幸平; 和田節; 遊佐陽一; 吉田和弘; 安東敏弘; 土屋史紀; 深見公一郎; 佐々木豊, 31 Mar. 2014, 503, 384, 388
  • Not Refereed, bulletin of Kansai Organization for Nature Conservation, Kanasai Organization for Nature Conservation, Temporal change in the distribution of decapod crustaceans prior and posterior to catastrophic flooding by a typhoon in 2011, in three rivers of the Kii Peninsula, western Japan., Tanaka Kaoruko; Hamasaki Kanji; Yamada Makoto; Aoki Misuzu; Yusa Yoichi; Wada Keiji, 2013, 35, 2, 125, 140
  • Not Refereed, 2013, 48, 133, 141, 10.4035/jsfwr.48.133
    DOI URL
  • Not Refereed, 2013, 2013, 67
  • Not Refereed, On "Uga" specimen of Kumagus MINAKATA, 2012, 54, 1, 1, 4
  • Not Refereed, 九州沖縄農業研究成果情報, スクミリンゴガイ用忌避材と忌避材を利用した産卵抑制技術, 田坂幸平; 佐々木豊; 土屋史紀; 深見公一郎; 遊佐陽一; 安東敏弘, 03 Sep. 2010, 25, 5, 6
  • Not Refereed, 農作業研究, スクミリンゴガイ用忌避材を利用した産卵抑制技術, 田坂幸平; 土屋史紀; 深見公一郎; 佐々木豊; 遊佐陽一; 安東敏弘, May 2010, 45, 1, 2
  • Venus : journal of the Malacological Society of Japan, The malacological society of Japan, 22. Evidence for size-dependent allocation in a simultaneous hermaphrodite, the sea hare Aplysia kurodai(Abstracts of Papers Presented at the 2006 Annual Meeting of the Malacological Society of Japan (Tokyo)), Yusa Y., 30 Sep. 2006, 65, 3, 277, 277
  • 01 Mar. 2006, 50, 164, 164
  • Venus : journal of the Malacological Society of Japan, The malacological society of Japan, Multiple sex-determining genes cause large sex ratio variation in Pomacea canaliculata(Abstracts of Papers Presented at the 2005 Annual Meeting of the Malacological Society of Japan (Nishinomiya)), Yusa Y., 30 Jun. 2005, 64, 1, 81, 81
  • Not Refereed, 2005, 59, 2, 58, 61
  • Not Refereed, 2005, 3, 50, 51
  • Not Refereed, 2005, 91, 91, 51, 54
  • Not Refereed, 2004, 66, 92
  • 31 Mar. 2001, 45, 94, 94
  • 31 Mar. 2001, 45, 95, 95
  • Not Refereed, 2001, 63, 85
  • Not Refereed, Annals of the Sri Lanka Department of Agriculture, Distribution of an alien snail, Pomacea bridgesii, in fresh water habitats and its potential threat to faunal diversity and rice cultivation in Sri Lanka, YUSA Yoichi; Nugaliyadde, L; Jayasundera, D. M; Amarasinghe; A. A. L; Yusa, Y; Hidaka, T, 2001, 3, 375, 376
  • Researches on Population Ecology, Density-dependent growth and reproduction of the apple snail, Pomacea canaliculata:a density manipulation experiment in a paddy field, TANAKA Koichi; WATANABE Tomonoari; HIGUCHI Hiroya; MIYAMOTO Kenji; YUSA Yoichi; KIYONAGA Toru; KIYOTA Hirotsugu; SUZUKI Yoshito; WADA Takashi, 01 Dec. 1999, 41, 3, 253, 262
  • 02 Apr. 1999, 43, 70, 70
  • The malacological society of Japan, 46. Mating behaviour of Pomacea canaliculata : Effects of body size(Abstracts of Papers Presented at the 1998 Annual Meeting of the Malacological Society of Japan at Nagoya City), Yusa Y., 31 Jul. 1998, 57, 2, 151, 151
  • Sea Transparency and Colour, and the Salinity of Surface Water, in the Tanabe Bay Region Observed from July 1989 to September 1990, 29 Mar. 1991, 4, 83, 100

Books etc

  • May 2023
  • Nov. 2022, viii, 697p, 9784814004492
    CiNii Books URL
  • 2018, Not Refereed
  • The Evolution of Sexual Systems, Springer, 2018, Not Refereed
  • 2017, Not Refereed
  • 2006, Not Refereed
  • Global Advances in Ecology and Management of Golden Apple Snails, Philippine Rice Research Institute, 2006, Not Refereed
  • ZASSI54022002
  • 9784814004492

Presentations

  • Environmental Tolerance of Two Species of Sacoglossa, 17 Mar. 2025, 15 Mar. 2025 - 18 Mar. 2025
  • 16 Mar. 2025, 15 Mar. 2025 - 18 Mar. 2025
  • 20 Mar. 2024, 16 Mar. 2024 - 25 Mar. 2024
  • Hendry Wijayanti; Yoichi Yusa, The 71st Annual Meeting of the Ecological Society of Japan, Labile sex allocation and sex ratio in the androdioecious barnacle Octolasmis unguisiformis, 20 Mar. 2024, 16 Mar. 2024 - 21 Mar. 2024
  • 17 Mar. 2024
  • 17 Mar. 2024
  • 16 Mar. 2024
  • Sayaka Mito; Yoichi Yusa, The 10th EAFES International Congress, Role of “stolen chloroplasts” in the large-scale regeneration of sacoglossan sea slugs, 18 Jul. 2023
  • Asami Kajimoto; Yoichi Yusa, The 10th EAFES International Congress, Non-consumptive effects of the parasitic rhizocephalan barnacle on its crab host, 18 Jul. 2023
  • Haruka Uehara; Yoichi Yusa, The 10th EAFES International Congress, Indirect effects of carrion crows on rice through behavioral changes of apple snails, 18 Jul. 2023
  • Asami Kajimoto; Yoichi Yusa, The 10th EAFES International Congress, Non-consumptive effects on the host due to the rhizocephalan infection, 17 Jul. 2023
  • Haruka Uehara; Yoichi Yusa, The 10th EAFES International Congress, Indirect effects involving the chain of learning in agroecosystems, 17 Jul. 2023
  • Poster presentation, 17 Mar. 2023
  • Oral presentation, 10 Dec. 2022
  • Oral presentation, 10 Dec. 2022
  • 12 Nov. 2022
  • 14 Mar. 2022, 14 Mar. 2022 - 19 Mar. 2022
  • 14 Mar. 2022, 14 Mar. 2022 - 19 Mar. 2022
  • 14 Mar. 2022
  • 11 Dec. 2021
  • 11 Dec. 2021
  • Life cycle and seasonal sex ratio variation in the rhizocephalan Peltogasterella gracilis, 02 Dec. 2021
  • Oral presentation
  • Oral presentation
  • Poster presentation
  • Poster presentation
  • Poster presentation
  • Poster presentation

Industrial Property Rights

  • 貝の捕獲器, 遊佐 陽一, 特願2023-126277(P2023-126277), 特許第7449016号(P7449016)

Research Projects

  • 基盤研究(B), 01 Apr. 2024 - 31 Mar. 2028, 24K02100, 性配分のwhyとhow: フジツボ類における究極要因と至近要因の解明, 遊佐 陽一; 山口 幸; 關野 正志; 和田 哲; 豊田 賢治, 日本学術振興会, 科学研究費助成事業, 奈良女子大学, 18330000, 14100000, 4230000, kaken
    対象リソースIRI
  • Grant-in-Aid for Challenging Research (Exploratory), Jun. 2024 - Mar. 2027, 24K21991, Why do sacoglossan sea slugs autotomize and regenerate?, 遊佐 陽一, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 6370000, 4900000, 1470000, kaken
    対象リソースIRI
  • 省力的なIPM を実現する病害虫予報技術の開発, Apr. 2023 - Mar. 2027, みどりの食料システム戦略実現技術開発・実証事業のうち農林水産研究の推進 （委託プロジェクト研究）, 遊佐 陽一, 農林水産省, 奈良女子大学, rm:media_coverage
    対象リソースIRI
  • 基盤研究(B), 01 Apr. 2022 - 31 Mar. 2026, 22H02681, 網羅的サンプリングに基づく深海底生動物の多様化機構解明, 狩野 泰則; 遊佐 陽一; 岡西 政典; 角井 敬知, 日本学術振興会, 科学研究費助成事業, 東京大学, 17030000, 13100000, 3930000, kaken
    対象リソースIRI
  • Grant-in-Aid for Challenging Research (Exploratory), Jun. 2022 - Mar. 2025, 22K19311, Elucidating regerenation ability of sacoglossan sea slugs, 遊佐 陽一; 田川 訓史, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 6370000, 4900000, 1470000, 他に類をみない嚢舌類の自切・再生現象の総合的理解を図るべく，４つの研究課題を設定し研究を推進した。
    １）再生プロセスの遺伝学的解明：幼若個体から老齢個体までの齢のコノハミドリガイに自切を誘導し，自切しない個体をコントロールとして，その後の再生プロセスを詳細に追跡することを試みた。ただし，コノハミドリガイの飼育が安定せず十分な実験個体数が得られなかったため，他に実験に適した種を数多く探索し，チドリミドリガイがもっとも実験室内での飼育が容易で，現時点でのモデル生物として適切だと判断した。チドリミドリガイで再生に関わる遺伝子を特定するため，自切後の再生部位からRNAを抽出し，十分量のRNAが得られることを確認した。
    ２）自切部位と器官・組織の再生：コノハミドリガイを用い，自切面より前や後ろのさまざまな位置で自切を誘導し，自切部位とその後の再生との関係を調べた。自切面より後部の場合は問題なく再生することが明らかになった。
    ３）盗葉緑体との関係：コノハミドリガイで自切を誘導し，強光と弱光，および餌の有無を組み合わせた4条件が再生に及ぼす影響を予備的に調べた。盗葉緑体による光合成が再生に関わることが示唆された。
    ４）嚢舌類の系統における自切・再生能の進化：嚢舌類およびその姉妹群である有肺類の多くの種を野外から採集し，大規模再生の可否を調べた。嚢舌類の複数種で大規模再生がみられたが，有肺類では嚢舌類のような大規模再生はみられなかった。, kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (B), 01 Apr. 2019 - 31 Mar. 2023, 19H03284, Exploring the diversity of sexual systems in barnacles, 遊佐 陽一; 山口 幸; 關野 正志, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 17160000, 13200000, 3960000, 動物界にみられる性システム（雌雄同体や異体など）は極めて多様であるが，ある環境下でどのような性システムが進化するのかについて，理論・実証研究ともに十分な答えを得ていない。本研究では，広義のフジツボ類を対象に，性システムの多様性とそれを決める要因について多角的にアプローチする。そのために，４つのサブテーマを設定し，２０２０年度には以下の研究を行った。
    １．多種における性システムの解明：本年度は深海性ミョウガガイ類を中心に，性システムを引き続き調べた。加えて，根頭類においても性システムの研究を進めた。また，フジツボフクロムシの生活環を野外定期サンプリングにより調べ，論文として出版した（Yabuta et al. 2020）。生活史に沿った性システムの実態を明らかにするために，フサフクロムシの生活環を野外定期サンプリングにより引き続き調べた。
    ２．モデル種における種内変異の解析：今年度は，雄性異体種であるオノガタウスエボシについて，遺伝子解析に使用できるマイクロサテライトマーカーを11組開発した（Kobayashi et al. 2020）。
    ３．種間比較による進化パターンとプロセスの抽出：昨年度に引き続き，深海のミョウガガイ類を中心に，得られた種からDNAを抽出し，核とミトコンドリアの遺伝子塩基配列を決定した。
    ４．新たな数理モデルの作成と要因の解析：フクロムシ類における季節的な雄の出現パターンに関する数理モデルを作成した（Yamaguchi and Iwasa 2020）。またフジツボ類でも例外的にみられる放精種について，配偶子が届く範囲を決める，より汎用的な関数形を検討した。, kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (B), 01 Apr. 2018 - 31 Mar. 2022, 18H02494, Distribution, larval ecology and evolutionary history of deep-sea benthic animals, Kano Yasunori, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Tokyo, 17420000, 13400000, 4020000, Benthic invertebrates at deep-sea hydrothermal vents, cold seeps and those in hadal trenches have attracted considerable attention regarding their spatiotemporal distributions, colonization pathways and geological origins, as well as morphological, ecological, and physiological adaptation. We reconstructed molecular phylogenies for several clades with vent/seep or hadal taxa, revisited their morphological and taxonomic diversities both recent and in the past, and investigated their early ontogeny and dispersal capabilities as swimming larvae. High genetic connectivity among habitats and populations, suggested for some lineages, probably has resulted from vertical migration of hatched larvae to the photic zone, whereas direct developers tended to show more geographic differentiation than depth differentiation. We propose that planktotrophy and vertical migration have played significant roles both in the life history trajectories of individuals and in their evolutionary habitat shifts., kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (C), 01 Apr. 2016 - 31 Mar. 2020, 16K07462, The origin of androdioecy and genetic diversity of androgenetic clam Corbicula lumina, Komaru Akira, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Mie University, 4940000, 3800000, 1140000, The present study demonstrated thatWe conduct the 1) population analysis such as growth and maturity on the population including male and hermaphrodites, 2) comparison of spermatozoa produced by male and hermaphrodite, 3) microsatellite analysis of parents and its brooding juveniles. The self-fertilization rates were fluctuated among the hermaphrodites. These analyses demonstrated that the hermaphrodites accepted the spermatozoa from neighboring hermaphrodites and males. We propose the requirements for maintaining males, and for their successful reproduction in self-compatible hermaphrodite populations, to be: 1) high population density, 2) low self-fertilization rates of hermaphrodites; 3) more spermatozoa and greater survival of males than those of hermaphrodites, 4) simultaneous discharge of gametes from hermaphrodites and males., kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (B), 01 Apr. 2015 - 31 Mar. 2019, 15H04416, Evolution of sexual systems: their adaptive significance and mechanism of maintenance in barnacles, Yusa Yoichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 17680000, 13600000, 4080000, (1) We developed novel microsatellite markers for some androdioecious barnacles. We also compared the reproductive success and other reproductive characteristics of males and hermaphrodites in them. (2) We performed interspecific comparisons of sexual systems in many barnacle species. (3) We showed by transplanting experiments that sexual expressions are plastic to some extent in two androdioecious species. (4) We theoretically analyzed the evolutionary transitions from hermaphrodites to dwarf males, and reviewed both theoretical and empirical studies on sexual systems in barnacles., kaken
    対象リソースIRI
  • Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2014 - 31 Mar. 2017, 26650132, Factors promoting the evolution of kleptoplasty in sacoglossan sea slugs, Yusa Yoichi; Nakano Rie; Hirano Yayoi; Kitaura Jun; Miyamoto Ayaka; Hirokane Yu; Shiroyama Hiromi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 3900000, 3000000, 900000, Sacoglossan sea slugs can incorporate chloroplasts from their food algae and utilize them for photosynthesis. Although the duration of functional chloroplast retention differs greatly among species from 0 (non-retention) to several months, it is not fully understood when and why the ability of photosynthesis evolved.
    We collected data on the duration of photosynthesis and environmental factors possibly related to the evolution of photosynthetic ability for 40 sacoglossan species. Moreover, we constructed a molecular phylogeny of 219 sacoglossans including newly sequenced ones, and inferred the ancestral states concerning photosynthetic ability.
    The results showed that both the acquisition and long-term retention of photosynthetic ability evolved multiple times in the sacoglossan lineage. Food quality might be an important factor that influenced their evolution., kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (C), 2010 - 2012, 22570020, Adaptive significance of dwarf males in deep-sea barnacles, YUSA Yoichi; IWAGUCHI Shinichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 4550000, 3500000, 1050000, The adaptive significance of dwarf males is addressed in deep-sea barnacles. First, microsatellite markers were developed in Scalpellum stearnsii, and the reproductive success of their dwarf males was studied. Small males attained higher reproductive success than larger ones. Second, life history traits were studied and some pieces of information were obtained in this species and in a related species, S. scalpellum, in situ and/or in the aquarium. Third, using mathematical models and theoretical synthesis by reviewing relevant studies, it was suggested that dwarf males evolved under low-density conditions., kaken
    対象リソースIRI
  • Grant-in-Aid for Scientific Research (C), 2007 - 2009, 19570019, Factors affecting sex-ratio variation and sex-determining mechanisms in the apple snail Pomacea canaliculata, YUSA Yoichi; IWAGUCHI Shin-ichi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 3770000, 2900000, 870000, The freshwater snail Pomacea canaliculata shows a large variation in offspring sex ratio. We investigated whether this variation is caused by a small number of sex-determining genes, with two series of experiments. First, we reared F2 offspring from several crosses involving full-sib sisters with the same male, and determined sex ratios of F2. The sex ratios of F2 converged into a few values, indicating that the sex-determining genotypes of the F1 full-sib sisters were also a few. This suggests that the sex in this snail is determined by a few genes rather than polygenes. Secondly, we developed genetic markers to study linkage with the putative sex-determining genes. We found >40 microsatellite loci, and developed four useful markers. These markers were repeatable in PCR, polymorphic and followed Mendelian segregation. We conducted fragment analyses in two populations (Kumamoto and Nara) with these markers. One of them showed significantly different frequencies between males and females in both populations ; it may be in the same linkage group as a sex-determining locus., kaken
    対象リソースIRI
  • 1996, 水生外来動物の管理, 0, 0, 0, Competitive research funding
  • 1996, Management of aquatic invertebrate pests, 0, 0, 0, Competitive research funding
  • 1988, 水生無脊椎生物の生態解明, 0, 0, 0, Competitive research funding
  • 1988, ecological studies on aquatic invertebrates, 0, 0, 0, Competitive research funding
  • フジツボ類の生態, 0, 0, 0, Competitive research funding
  • 有害巻貝の生態に基づく防除, 0, 0, 0, Competitive research funding
  • スクミリンゴガイの防除, 0, 0, 0, Competitive research funding, rm:media_coverage
    対象リソースIRI
  • びぜん米粉ファーム, 17 Jun. 2024 - 31 Mar. 2025, スクミリンゴガイの被害回避にかかる研究
  • ボルクレイ, Aug. 2024 - Aug. 2025, 腐植酸液材アグロリグの水稲育苗散布によるスクミリンゴガイ忌避効果
  • 挑戦的研究（萌芽）, 01 Aug. 2022 - 31 Mar. 2024, 22K19311, Principal investigator, 嚢舌類ウミウシにおける驚異的な再生能力の実態解明
  • 令和３年度イノベーション創出強化研究推進事業, 13 May 2021 - 31 Mar. 2023, 21446455, Coinvestigator, スクミリンゴガイの被害撲滅に向けた総合的管理技術の革新および防除支援システムの開発
  • 基盤B, 18H02494, Coinvestigator, 深海ベントスの分布と幼生生態：化学合成群集と海溝最深部動物相の進化を探る
  • 基盤B, 19H03284, Principal investigator, フジツボ類の性システムの多様性を探る
  • A-STEP　, 31 Mar. 2023, Coinvestigator, 稲作農事暦に合わせたジャンボタニシの工学的防除対策モデルの構築および効果検証
  • 01 Apr. 2022 - 31 Mar. 2023, Coinvestigator, ウミウシの再生にかかわる遺伝子の同定
  • 令和３年度イノベーション創出強化研究推進事業, 13 May 2021 - 31 Mar. 2023, 21446455, Coinvestigator, スクミリンゴガイの被害撲滅に向けた総合的管理技術の革新および防除支援システムの開発
  • A-STEP　, 31 Mar. 2023, Coinvestigator, 稲作農事暦に合わせたジャンボタニシの工学的防除対策モデルの構築および効果検証
  • 基盤B, 01 Apr. 2019 - 31 Mar. 2023, 19H03284, Principal investigator, フジツボ類の性システムの多様性を探る
  • 基盤B, Jan. 2204 - 2603, 22H02681, Coinvestigator, 網羅的サンプリングに基づく深海底生動物の多様化機構解明 研究課題
  • 基盤B, Jan. 2204 - 2603, 22H02681, Coinvestigator, 網羅的サンプリングに基づく深海底生動物の多様化機構解明 研究課題
  • 基盤B, 01 Apr. 2019 - 31 Mar. 2023, 19H03284, Principal investigator, フジツボ類の性システムの多様性を探る
  • 挑戦的研究（萌芽）, 01 Aug. 2022 - 31 Mar. 2024, 22K19311, Principal investigator, 嚢舌類ウミウシにおける驚異的な再生能力の実態解明
  • IPMプロ, 01 Apr. 2023 - 31 Mar. 2027, Coinvestigator, みどりの食料システム戦略実現技術開発・実証事業のうち 農林水産研究の推進（委託プロジェクト研究） 「省力的なI P Mを実現する病害虫予報技術の開発」
  • 令和３年度イノベーション創出強化研究推進事業, 13 May 2021 - 31 Mar. 2023, 21446455, Coinvestigator, スクミリンゴガイの被害撲滅に向けた総合的管理技術の革新および防除支援システムの開発