Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

<jats:title>Abstract</jats:title>
<jats:p>Range expansions of host species are likely to modify host–parasitoid interactions. Observational studies have indicated that host species in recently colonized areas are less frequently attacked by parasitoids; however, these studies did not determine whether traditional parasitoids can still use host populations in these areas. Thus, it is unclear why the host has escaped from their traditional parasitoids in their recently colonized areas. In this study, we examined the interaction between myrmecophilous lycaenid butterfly, Arhopala japonica, and its larval parasitoids in northern Japan, a recently colonised area. This region corresponds to a distribution of A. japonica, a myrmecophilous lycaenid butterfly. No parasitoids emerged from A. japonica larvae collected in the north, whereas six parasitoid species attacked the host larvae in native areas. Attacks from the braconid wasp Cotesia sp. near inducta were the most common; however, parasitism tests revealed that Cotesia sp. near inducta and other parasitoid species completed their development successfully regardless of origin of their butterfly hosts. Population genetic analyses supported the recent range expansion of both A. japonica and Cotesia sp. near inducta. These results suggest that both hosts and parasitoids have experienced recent population expansion; however, the more rapid range expansion of A. japonica has caused escape from the enemy in newly colonized areas.</jats:p>

DOI： 10.1093/biolinnean/blad060

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Plos One  

Land plants have diverse defenses against herbivores. In some cases, plant response to insect herbivory may be chronological and even transgenerational. Feeding by various stink bugs, such as the bean bug Riptortus pedestris (Hemiptera: Alydidae), induce physiological changes in soybean, called as green stem syndrome, which are characterized by delayed senescence in stems, leaves, and pods. To investigate the plant response to the bean bug feeding in the infested generation and its offspring, we studied the effects of R. pedestris infestation on Glycine soja, the ancestral wild species of soybean. Field surveys revealed that the occurrence of the autumn R. pedestris generation coincided with G. soja pod maturation in both lowland and mountainous sites. Following infestation by R. pedestris, pod maturation was significantly delayed in G. soja. When G. soja seeds obtained from infested and non-infested plants were cultivated, the progeny of infested plants exhibited much earlier pod maturation and larger-sized seed production than that of control plants, indicating that R. pedestris feeding induced transgenerational changes. Because earlier seed maturity results in asynchrony with occurrence of R. pedestris, the transgenerational changes in plant phenology are considered to be an adaptive transgenerational and chronological defense for the plant against feeding by the stink bug.

DOI： 10.1371/journal.pone.0263904

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PubMed

Authorship：Lead author,　Corresponding author   Language：English  

Event date： 2025.3

Presentation type：Oral presentation (general)  

Event date： 2024.8

Language：English   Presentation type：Oral presentation (general)  

Presentation type：Oral presentation (invited, special)  

Event date： 2025.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農業大学農学部 厚木キャンパス   Country：Japan  

Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan