{"id":5928,"date":"2026-05-25T09:57:20","date_gmt":"2026-05-25T00:57:20","guid":{"rendered":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/?post_type=research&p=5928"},"modified":"2026-05-25T09:59:35","modified_gmt":"2026-05-25T00:59:35","slug":"mizuno-riou","status":"publish","type":"research","link":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/research\/mizuno-riou\/","title":{"rendered":"MIZUNO, Riou"},"content":{"rendered":"\n
\n
\n
\n

Research Area:\u3000Environmental Science<\/mark>\u3000
<\/strong>Research Specialization:\u3000Insect Ecology<\/mark>\u3000
<\/strong>Name:\u3000MIZUNO, Riou<\/mark><\/strong><\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

Key words; Ant, natural history, behavior, biodiversity, evolution<\/strong><\/p>\n<\/div>\n\n\n\n

\n
\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n
\n
\n

Recent Research<\/strong><\/h2>\n\n\n\n

1\uff0eEvolution of army ants; a comparative study of Non-army doryline ants<\/strong><\/p>\n\n\n\n

Army ants are predators in tropical terrestrial\u00a0 ecosystems. They have huge colony sizes and unique life history traits, such as nomadism, mass raid, and specialized predation on other ant species. The evolutionary history of the army ants is still mysterious. The biology of phylogenetically related \u201cnon-army ant dorylines\u201d, the key to accessing this mystery, is also not well studied due to their rarity. We are conducting a field natural history study on these non-army ants to fill this knowledge gap and consider the evolution of the army ants.<\/p>\n\n\n\n

2\uff0eDiversity of life history traits of Strumigenys <\/em>ants.<\/strong><\/p>\n\n\n\n

Strumigenys <\/em>is a highly diverse ant genus that contains nearly 900 species, distributed across biogeographic regions. Some of them have spring-loaded, ultra-fast closing mandibles, which are called \u201ctrap-jaw\u201d, and prey on small soil arthropods by using these jaws. We are trying to understand the background of their extreme diversification and ecological success through comparative studies on their biology across different biogeographic regions.<\/p>\n\n\n\n

3\uff0eEvolution of sophisticated collective behavior in insects<\/strong><\/p>\n\n\n\n

Social insects perform various sophisticated and complex collective behaviors. But it is difficult to intuitively understand what evolutionary processes gave rise to such behavior. We are trying to understand it from comparative behavioral studies by using two material species: 1) non-army ant doryline species performs army ant-like raid behavior; 2) Leptogenys cyanicatena<\/em>,known for \u201cself-assembling chain\u201d behavior for transporting huge prey millipedes.<\/p>\n<\/div>\n\n\n\n

\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n<\/div>\n<\/div>\n\n\n\n
\n
\n

Selected publications<\/strong><\/p>\n<\/div>\n\n\n\n

\n
\"\"<\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Mizuno et al. (2025) Temporary social parasitism in the ant Strumigenysmutica<\/em>: colony composition and behavioral
\u3000\u3000\u3000interactions with host species Strumigenyssolifontis<\/em> and S. lewisi<\/em>. Myrmecological News 35: 111\u2013124.<\/p>\n\n\n\n

Mizuno et al. (2023) Colony composition, phasic reproduction, caste dimorphism, and prey preferences of the
\u3000\u3000\u3000Oriental non-army doryline ant Yunodoryluseguchii<\/em>(Borowiec, 2009) (Hymenoptera: Formicidae: Dorylinae).
\u3000\u3000\u3000Insectes Sociaux 70: 105\u2013117.<\/p>\n\n\n\n

Mizuno et al. (2022) Field observations on nestmate recruitment to millipedes in the chain-assembling ponerine ant
\u3000\u3000\u3000Leptogenyscyanicatena<\/em> (Formicidae: Ponerinae) in northern Thailand. Asian Myrmecology. Asian
\u3000\u3000\u3000Myrmecology 15: 015003.<\/p>\n\n\n\n

Mizuno et al. (2021) Colony composition, phasic reproduction, and queen\u2013worker dimorphism of an oriental non-
\u3000\u3000\u3000army ant doryline Cerapachyssulcinodis<\/em>species complex in northern Thailand. Insectes Sociaux 69(1), 19-35.<\/p>\n<\/div>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Research Area:\u3000Environmental Science\u3000Research Specialization:\u3000Insect Ecology\u3000Name:\u3000MIZUNO, Riou Key words; Ant, natural history, behavior, biodiversity, evolution Recent Research 1\uff0eEvolution of army ants; […]<\/p>\n","protected":false},"author":1,"featured_media":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-5928","research","type-research","status-publish","hentry","research_category-environmental-and-ecological-sciences","sdgs_category-responsible-consumption-and-production","sdgs_category-climate-action","sdgs_category-life-on-land","sdgs_category-2-zero-hunger"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"admin","author_link":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/author\/admin\/"},"uagb_comment_info":0,"uagb_excerpt":"Research Area:\u3000Environmental Science\u3000Research Specialization:\u3000Insect Ecology\u3000Name:\u3000MIZUNO, Riou Key words; Ant, natural history, behavior, biodiversity, evolution Recent Research 1\uff0eEvolution of army ants; […]","_links":{"self":[{"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/research\/5928","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/research"}],"about":[{"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/types\/research"}],"author":[{"embeddable":true,"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/comments?post=5928"}],"version-history":[{"count":1,"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/research\/5928\/revisions"}],"predecessor-version":[{"id":5929,"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/research\/5928\/revisions\/5929"}],"wp:attachment":[{"href":"https:\/\/www.ag.kagawa-u.ac.jp\/english\/wp-json\/wp\/v2\/media?parent=5928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}