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Effect of female body size on courtship preferences of males in two Pierid butterfly species: Pieris melete and P. napi 雌性体型对两种斑蝶雄性求偶偏好的影响
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-10-08 DOI: 10.1111/ens.12614
Masaaki Ohata
{"title":"Effect of female body size on courtship preferences of males in two Pierid butterfly species: Pieris melete and P. napi","authors":"Masaaki Ohata","doi":"10.1111/ens.12614","DOIUrl":"https://doi.org/10.1111/ens.12614","url":null,"abstract":"<p>Reproductive interference has been reported in many organisms and has been observed in all aspects of the reproductive process. In some organisms, heterospecific females are preferred due to their larger body size. However, no studies have conducted mate choice experiments involving manipulation of female body size in species with smaller females than males. This study examined differential responses of males to female body size to determine the direction of reproductive interference in the butterflies <i>Pieris melete</i> and <i>Pieris napi</i> (Pieridae) by investigating whether female body size affects courtship partner recognition. In individuals of normal body size, both larger <i>P. melete</i> males and smaller <i>P. napi</i> males courted larger <i>P. melete</i> females with high frequency. However, when body size was manipulated by regulating temperatures during larval growth, smaller <i>P. melete</i> males courted smaller <i>P. melete</i> females, whereas larger <i>P. napi</i> males courted larger <i>P. napi</i> females. These results imply that an interspecies difference in the effect of female body size on courtship partner recognition caused reproductive interference between <i>P. melete</i> and <i>P. napi</i>.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Geographic pattern of the use of host plants (Cirsium spp., Asteraceae) in the phytophagous ladybird beetle Henosepilachna niponica (Coleoptera: Coccinellidae) in Tohoku district, northern Honshu, Japan 日本本州北部东北地区食虫瓢虫甲虫(鞘翅目:瓢虫科)寄主植物利用的地理格局
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-10-05 DOI: 10.1111/ens.12613
Daiki Nakasone, Jun Yokoyama, Naoyuki Fujiyama
{"title":"Geographic pattern of the use of host plants (Cirsium spp., Asteraceae) in the phytophagous ladybird beetle Henosepilachna niponica (Coleoptera: Coccinellidae) in Tohoku district, northern Honshu, Japan","authors":"Daiki Nakasone,&nbsp;Jun Yokoyama,&nbsp;Naoyuki Fujiyama","doi":"10.1111/ens.12613","DOIUrl":"https://doi.org/10.1111/ens.12613","url":null,"abstract":"<p>The phytophagous ladybird beetle <i>Henosepilachna niponica</i> (Lewis) (Coleoptera: Coccinellidae) depends basically on thistles (<i>Cirsium</i> spp., Asteraceae) as its host plants. However, many previous studies have not identified the host plants (thistles, <i>Cirsium</i> spp.) of <i>H. niponica</i>, at the species level, and its host plants have often only been recorded as “thistles” or “<i>Cirsium</i> spp.” Furthermore, a few studies in which host thistle species have been identified appeared as small articles in Japanese language, reporting information regarding a particular site. Host thistle species across the distribution range of <i>H. niponica</i> have not yet been summarized, and only a few studies have elucidated the host plants of <i>H. niponica</i> at the regional level with the exact identification of the thistle species. In this study, we conducted a literature survey to integrate the scattered information on the host plants of <i>H. niponica</i>. In addition, we conducted field investigations for determining host-use patterns by <i>H. niponica</i> at 78 sites in the Tohoku district, northern Honshu, Japan, where information is relatively limited. The results revealed that <i>H. niponica</i> utilizes at least 19 thistle species as host plants across its distribution range, of which 4 thistle species (<i>C. alpicola</i>, <i>C. amplexifolium</i>, <i>C. nipponicum</i>, and <i>C. tonense</i>) are regarded as the main hosts of <i>H. niponica</i> in the Tohoku district.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.12613","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction to “Taxonomic revision of the extant species of the Japanese Stephanidae (Hymenoptera), with discussion on distribution pattern and conservation importance” 对“日本茧蜂科(膜翅目)现存种的分类订正及分布格局和保护意义的讨论”的更正
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-10-01 DOI: 10.1111/ens.12618
{"title":"Correction to “Taxonomic revision of the extant species of the Japanese Stephanidae (Hymenoptera), with discussion on distribution pattern and conservation importance”","authors":"","doi":"10.1111/ens.12618","DOIUrl":"https://doi.org/10.1111/ens.12618","url":null,"abstract":"<p>Watanabe K (2024) Taxonomic revision of the extant species of the Japanese Stephanidae (Hymenoptera), with discussion on distribution pattern and conservation importance. <i>Entomological Science</i> <b>27</b>, e12588. DOI: 10.1111/ens.12588</p><p>An error was noted in the data for a paratype of “<i>Parastephanellus ryukyuensis</i> sp. nov.”</p><p>The original statement incorrectly stated: “1F, Ryukyu Isls., Iriomotejima Is., Okinawa Pref., Taketomi Town, Komi, 4.XI.2023, in light trap, T.Wachi leg. (RUM).”</p><p>This should read as: “1F, Ryukyu Isls., Iriomotejima Is., Okinawa Pref., Taketomi Town, Funaura, 4.XI.2023, in light trap, N.Wachi leg. (RUM).”</p><p>We apologize for this error.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.12618","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cantharidin world on bird droppings: Reused cantharidin after bird predation of cantharidin-producing insects 鸟类粪便中的斑蝥素世界:鸟类捕食产生斑蝥素的昆虫后,重新使用斑蝥素
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-09-30 DOI: 10.1111/ens.12612
Hidemori Yazaki, Kosei Hashimoto, Nozomu Sato, Fumio Hayashi
{"title":"Cantharidin world on bird droppings: Reused cantharidin after bird predation of cantharidin-producing insects","authors":"Hidemori Yazaki,&nbsp;Kosei Hashimoto,&nbsp;Nozomu Sato,&nbsp;Fumio Hayashi","doi":"10.1111/ens.12612","DOIUrl":"https://doi.org/10.1111/ens.12612","url":null,"abstract":"<p>Cantharidin is produced only by beetles of Meloidae and Oedemeridae and represents a rare resource for canthariphilous insects that ingest fluids and/or portions of living and even dead meloid and oedemerid beetles. Although the physiological mechanism is unknown, these canthariphilous insects must have developed a superior ability to search for this rare resource in their habitats. They would be able to access cantharidin even in minute amounts. In this study, we found that canthariphilous insects are attracted to traces of cantharidin that remain in bird droppings after the birds have consumed meloid or oedemerid beetles. We succeeded in reproducing this phenomenon in the field by experimentally using quail droppings after giving meloid or oedemerid beetles. Thus, cantharidin was cycled from bird droppings to canthariphilous insects after being dispersed by birds widely and vertically in the cantharidin world consisting of cantharidin-producing insects and other interacting members via cantharidin.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.12612","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diverse habitats promote coexistence of sympatric predaceous diving beetles in paddy environments 多样的生境促进了同域食肉潜水甲虫在水田环境中的共存
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-09-19 DOI: 10.1111/ens.12601
Reiya Watanabe, Shin-ya Ohba, Shiro Sagawa
{"title":"Diverse habitats promote coexistence of sympatric predaceous diving beetles in paddy environments","authors":"Reiya Watanabe,&nbsp;Shin-ya Ohba,&nbsp;Shiro Sagawa","doi":"10.1111/ens.12601","DOIUrl":"https://doi.org/10.1111/ens.12601","url":null,"abstract":"<p>Understanding species coexistence is fundamental to community ecology and biodiversity conservation. Diving beetles serve as biodiversity indicators in wetlands, rendering an understanding of their coexistence mechanisms essential for wetland conservation efforts. Previous research in this regard have focused solely on either larvae or adults, neglecting potential spatiotemporal partitioning across life stages. We hypothesized that predatory and less mobile larvae are more likely to compete for resources than scavenging and flight-capable adults, resulting in spatiotemporal niche partitioning among larvae. To address gaps in understanding their spatiotemporal niche partitioning and habitat use, we investigated four dytiscid species—<i>Rhantus suturalis</i>, <i>Hydaticus bowringii</i>, <i>Hydaticus grammicus</i> and <i>Cybister brevis</i>—that are prevalent in Japan and often coexist in paddy environments. This study aimed to clarify their coexistence mechanisms and habitat use to develop the conservation strategies of their populations in paddy environments. Two-year field surveys were undertaken in two paddy fields, an agricultural ditch and a pond in Ibaraki Prefecture, Japan. Adults exhibited similar habitat uses, favoring paddy fields from May to July but seeking refuge in a ditch or pond following paddy field drainage. Conversely, we found spatiotemporal difference of emergence in larval abundance across the four species, which may promote their coexistence in paddy environments. We also observed interspecific differences in the feeding preferences of adult and larval diving beetles, which may help avoid competition. Our results underscore the importance of including diverse habitats in paddy environments to preserve diving beetle species diversity.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 4","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Wing base morphology supports paraphyly of Papilionoidea s.s. (Lepidoptera) 翅基形态支持凤蝶科(鳞翅目)的分翅。
IF 0.9 4区 农林科学
Entomological Science Pub Date : 2025-08-06 DOI: 10.1111/ens.12609
Kohei Sakai, Masaya Yago, Kazunori Yoshizawa
{"title":"Wing base morphology supports paraphyly of Papilionoidea s.s. (Lepidoptera)","authors":"Kohei Sakai,&nbsp;Masaya Yago,&nbsp;Kazunori Yoshizawa","doi":"10.1111/ens.12609","DOIUrl":"https://doi.org/10.1111/ens.12609","url":null,"abstract":"<p>Traditionally, skippers (Hesperiidae) and moth-like butterflies (Hedylidae) were classified in separate superfamilies outside the butterfly superfamily Papilionoidea <i>sensu stricto</i>. However, recent molecular phylogenies including phylogenomics placed the swallowtails (family Papilionidae) as the sister group to all other butterflies, including skippers and moth-like butterflies, making the traditionally recognized Papilionoidea <i>s.s.</i> paraphyletic. However, no morphological studies have supported this relationship to date. Here, we conducted a cladistic analysis based on wing base characters to evaluate these competing systematic hypotheses. Our results support a sister-group relationship between skippers and moth-like butterflies and their inclusion within Papilionoidea <i>sensu lato</i>, consistent with molecular-based phylogenies. In contrast, the wing base morphology suggests the monophyly of Pieridae + Riodinidae + Lycaenidae, a result that contradicts both molecular and other morphological evidence, highlighting the potential limitations of this character system. Based on our morphological examinations and ancestral state reconstruction, we propose a hypothetical ground plan for the butterfly wing base.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 3","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144782286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phylogenetic relationships of subfamily Patrobinae (Coleoptera: Carabidae) in Japan, with a focus on genus Apatrobus and the description of a new species 日本斑蝽亚科的系统发育关系(鞘翅目:斑蝽科),重点介绍斑蝽属和一新种的描述
IF 0.7 4区 农林科学
Entomological Science Pub Date : 2025-07-27 DOI: 10.1111/ens.12606
Toshiaki Dejima, Teiji Sota
{"title":"Phylogenetic relationships of subfamily Patrobinae (Coleoptera: Carabidae) in Japan, with a focus on genus Apatrobus and the description of a new species","authors":"Toshiaki Dejima,&nbsp;Teiji Sota","doi":"10.1111/ens.12606","DOIUrl":"https://doi.org/10.1111/ens.12606","url":null,"abstract":"<p>In Japan, tribe Patrobini (subfamily Patrobinae: family Carabidae) comprises five genera: <i>Diplous</i>, <i>Minypatrobus</i>, <i>Apenetretus</i>, <i>Archipatrobus</i>, and <i>Apatrobus</i>. We studied the phylogenetic relationships of these genera and all known species of <i>Apatrobus</i> using mitochondrial cytochrome <i>c</i> oxidase subunit I (<i>COI</i>) and nuclear <i>28S</i> ribosomal RNA (<i>28S</i>) sequences. We also studied the phylogenetic placement of Japanese Patrobini taxa among those of North America and Eurasia using <i>COI</i> and <i>28S</i> gene sequences. Among known <i>Apatrobus</i> taxa, <i>Apatrobus hayachinensis</i> and <i>Apatrobus michinorii</i> were phylogenetically determined not to belong to <i>Apatrobus</i>, but to be involved in the lineage of <i>Apenetretus</i>, which is known from Japan (Honshu) and Taiwan. We propose that these species be renamed <i>Apenetretus hayachinensis</i> <b>n</b>. <b>comb</b>. and <i>Apenetretus michinorii</i> <b>n</b>. <b>comb</b>., respectively. The remaining <i>Apatrobus</i> species are divided into eastern and western clades in Japan, with the eastern clade containing six closely related species of central Honshu and the western clade containing two groups of species found in Kyushu and in Shikoku and southwestern Honshu (Chugoku District and Kii Peninsula), respectively. Additionally, we examined the species status of some populations based on molecular phylogenetic and morphological analyses and describe the new species <i>Apatrobus tsujii</i> Dejima &amp; Sota, <b>n</b>. <b>sp</b>., from northern Kyushu.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Searching in the ancient: Old museum type material reveals two remarkable undescribed species of Aulacidae (Hymenoptera: Evanioidea) from the Oriental Region 在古代博物馆类型的材料中搜索发现了两个来自东方地区的显著未描述的蜂科(膜翅目:叶蜂科)
IF 0.7 4区 农林科学
Entomological Science Pub Date : 2025-07-25 DOI: 10.1111/ens.12603
Giuseppe Fabrizio Turrisi
{"title":"Searching in the ancient: Old museum type material reveals two remarkable undescribed species of Aulacidae (Hymenoptera: Evanioidea) from the Oriental Region","authors":"Giuseppe Fabrizio Turrisi","doi":"10.1111/ens.12603","DOIUrl":"https://doi.org/10.1111/ens.12603","url":null,"abstract":"<p>The study of old type series stored at The Natural History Museum, London, allows the designation of lectotype and paralectotypes, and redescription of <i>Pristaulacus erythrocephalus</i> Cameron, 1905 and <i>Pristaulacus fasciatipennis</i> Cameron, 1906. In addition, the male of the latter species is described for the first time. Two new large and remarkable overlooked species, previously hidden in the Cameron's type material of the above-mentioned species are described and illustrated, namely <i>Pristaulacus cephalocarinatus</i> Turrisi, <b>sp. nov.</b> from Indonesia (West Kalimantan) and Malaysia (Sarawak), previously treated under <i>P. erythrocephalus</i>, and <i>Pristaulacus nataliae</i> Turrisi, <b>sp. nov.</b>, from Malaysia (Sarawak), previously treated under <i>P. fasciatipennis</i>. In addition, a brief taxonomic account of the <i>Pristaulacus flavipennis</i> species group, which comprises six species (including <i>P. erythrocephalus</i> and <i>P. cephalocarinatus</i> <b>sp. nov.</b>), is presented along with a key to species.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Seasonal occurrence of and adult diapause in the tortoise leaf beetle Aspidimorpha difformis (Motschulsky, 1860) (Coleoptera: Chrysomelidae) 异叶甲Aspidimorpha diformis (Motschulsky, 1860)的季节发生及成虫滞育(鞘翅目:金甲科)
IF 0.7 4区 农林科学
Entomological Science Pub Date : 2025-07-25 DOI: 10.1111/ens.12605
Kengo Noma, Tomoyosi Nisimura
{"title":"Seasonal occurrence of and adult diapause in the tortoise leaf beetle Aspidimorpha difformis (Motschulsky, 1860) (Coleoptera: Chrysomelidae)","authors":"Kengo Noma,&nbsp;Tomoyosi Nisimura","doi":"10.1111/ens.12605","DOIUrl":"https://doi.org/10.1111/ens.12605","url":null,"abstract":"<p>Leaf beetles have diverse life cycles and temperate species exhibit several characteristics, such as a long life cycle and long diapause. <i>Aspidimorpha</i> is a group of tortoise beetles in the family Chrysomelidae that inhabit the Oriental and eastern Palearctic regions, which were originally derived from tropical and subtropical regions; however, voltinism and diapause in their life cycles remain unclear. Because the tortoise beetle <i>Aspidimorpha difformis</i> inhabits the northernmost region of the temperate zone among <i>Aspidimorphini</i>, a more detailed understanding of its life history will provide insights into the evolution of its life cycle. We herein performed quantitative field research on the seasonal occurrence of <i>A. difformis</i> in Kanagawa Prefecture, Japan, as well as rearing experiments. In the field, adults overwintered, oviposited, and first-generation larvae occurred between mid-May and mid-July. Most larvae and adults disappeared by early August, except for several individuals in autumn and early winter. Under a constant temperature (20 or 25°C) and photoperiod (LD 12:12 or 16:8), the larval period was short (16–29 days), whereas the pre-oviposition period was long (83–197 days). In conclusion, <i>A. difformis</i> is mainly univoltine and partially bivoltine, which is regulated by an obligatory adult diapause. A life cycle with a long diapause may be adopted to avoid high summer temperatures and poor conditions in food because larvae fail to develop in summer. In contrast to <i>A. miliaris</i>, which is multivoltine with a facultative summer diapause, environments in cooler regions may favor the evolution of univoltinism in <i>A. difformis</i>.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Age-dependent decline of fighting performance in the Japanese rhinoceros beetle Trypoxylus dichotomus (Coleoptera: Scarabaeidae) 日本角甲(鞘翅目:金龟甲科)战斗性能的年龄依赖性下降
IF 0.7 4区 农林科学
Entomological Science Pub Date : 2025-07-25 DOI: 10.1111/ens.12607
Asahi Kanda, Takahiro Ueno, Wataru Kojima
{"title":"Age-dependent decline of fighting performance in the Japanese rhinoceros beetle Trypoxylus dichotomus (Coleoptera: Scarabaeidae)","authors":"Asahi Kanda,&nbsp;Takahiro Ueno,&nbsp;Wataru Kojima","doi":"10.1111/ens.12607","DOIUrl":"https://doi.org/10.1111/ens.12607","url":null,"abstract":"<p>Age can affect the outcomes of male–male contests, but its effects vary across species. In some species, winning probability increases with age due to increased investment in reproduction as a strategy of terminal investment, while in others, it decreases due to senescence. In the Japanese rhinoceros beetle, <i>Trypoxylus dichotomus</i>, males use their horns to compete for resources and mates. Previous research has shown that the horn and body size influence contest outcomes. We investigated the effect of age on winning probability in male–male contests. We also measured the daily changes in lifting and grasping forces as indicators of fighting ability. Both body size and age differences significantly affected contest outcomes, with larger or younger males being more likely to win. Fighting ability declined with age; specifically, males over 20 days of age exhibited decreased grasping and lifting forces. Given the short reproductive season and low survival rate of natural populations of this species, selection probably favors individuals that fight with full effort regardless of age. Consequently, contest outcomes are primarily determined by differences in physical abilities, and older males with reduced fighting performance are more likely to lose to younger males. This study emphasized the importance of morphological and physiological factors in determining competitive outcomes and highlighted the impact of life history on sexual selection dynamics.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"28 3","pages":""},"PeriodicalIF":0.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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