Entomological Science最新文献

Effect of cell position of nest comb on development and survival of immatures in pre-emergence colonies of a paper wasp Polistes jokahamae (Hymenoptera, Vespidae) 蜂窝细胞位置对纸蜂羽化前幼蜂发育和存活的影响（膜翅目，蜂科）

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-10-15 DOI: 10.1111/ens.70039

Kazuyuki Kudô, Naoya Takatsu, Koushi Nishida, Shinsaku Koji

{"title":"Effect of cell position of nest comb on development and survival of immatures in pre-emergence colonies of a paper wasp Polistes jokahamae (Hymenoptera, Vespidae)","authors":"Kazuyuki Kudô, Naoya Takatsu, Koushi Nishida, Shinsaku Koji","doi":"10.1111/ens.70039","DOIUrl":"https://doi.org/10.1111/ens.70039","url":null,"abstract":"Polistes, primitively eusocial wasps, build paper nests using plant fibers and oral secretions produced by the wasps themselves. In general, a single larva is reared one per cell, spinning a completely closed cocoon upon pupation. By contrast, in the subgenus Gyrostoma of Polistes, the same cell is often simultaneously occupied by two successive broods. After cocoon spinning by the post-feeding larvae in the central cells, an additional egg was laid on the silk cap inside the cell. Eggs grow and attain second-instar larvae during the emergence of older occupants. In addition to the eggs laid on the silk cap, eggs are laid in newly constructed cells outside the combs. Although a recent study suggested that rearing two immatures in a single cell improved the cost of construction and maintenance of the nest, the disadvantages of rearing multiple immatures in a single cell have not yet been evaluated. We compared developmental time and mortality rates between immatures reared on silk caps in the central cells and those in the peripheral cells. In the central cells, the merit of shorter development for 1–2 days of the first-instar larvae was shown; however, this was almost offset by the demerit of longer egg development. The survival rates of the eggs and first-instar larvae did not differ between the two cell positions. We concluded that rearing two immatures in a single cell does not result in disadvantages during the early stages of development.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 4","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205678","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

Geographical proliferation of ongoing novel host use by the herbivorous ladybird beetle Henosepilachna vigintioctopunctata (Coleoptera: Coccinellidae) 草食性瓢虫甲虫（Henosepilachna vigintioctopunctata）新寄主利用的地理增殖（鞘翅目：瓢虫科）

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-09-15 DOI: 10.1111/ens.70038

Naoyuki Fujiyama, Shogo Kikuta, Sih Kahono, Toru Katoh, Shinsaku koji, Takuya Murata, Yaowaluk Monthum, Rosli Hashim, Haruo Katakura

{"title":"Geographical proliferation of ongoing novel host use by the herbivorous ladybird beetle Henosepilachna vigintioctopunctata (Coleoptera: Coccinellidae)","authors":"Naoyuki Fujiyama, Shogo Kikuta, Sih Kahono, Toru Katoh, Shinsaku koji, Takuya Murata, Yaowaluk Monthum, Rosli Hashim, Haruo Katakura","doi":"10.1111/ens.70038","DOIUrl":"https://doi.org/10.1111/ens.70038","url":null,"abstract":"The acquisition of novel host plants can be regarded as an incipient phase in the speciation continuum of herbivorous ladybird beetles. Therefore, describing the geographical pattern of the establishment of associations with novel hosts is indispensable for elucidating the whole picture of their speciation continuum. The herbivorous ladybird beetle Henosepilachna vigintioctopunctata (Fabricius) (Coccinellidae: Epilachnini) depends basically on solanaceous plants, but also occurs on the introduced legume Centrosema molle Mart. ex Benth. (Fabaceae) in Southeast Asia; yet the geographical extent of this novel host-use has not been fully elucidated. In this study, we documented the geographical extent of the occurrence of H. vigintioctopunctata on C. molle through intensive field surveys. The use of C. molle by the beetles was newly detected in various regions. We also investigated the ability of larvae of H. vigintioctopunctata from several geographical populations to develop on C. molle in the laboratory. Geographic variation in the degree of adaptation to C. molle by H. vigintioctopunctata populations was also detected. Our results suggest that the degree of adaptation to C. molle by the respective beetle populations does not correspond with the frequency of occurrence of the beetles on C. molle in the wild at the regional level. It was interpreted that the degree of adaptation to C. molle by respective H. vigintioctopunctata populations is determined not only by the time since the novel host-use has started but also by ecological situations such as the relative abundance and availability of various host plants in respective local habitats.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 4","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.70038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148962519","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

Hatching synchrony in solitarious and gregarious locust eggs 单独和群居的蝗虫卵同步孵化

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-09-01 DOI: 10.1111/ens.70037

Seiji Tanaka

{"title":"Hatching synchrony in solitarious and gregarious locust eggs","authors":"Seiji Tanaka","doi":"10.1111/ens.70037","DOIUrl":"https://doi.org/10.1111/ens.70037","url":null,"abstract":"Synchronous hatching is widespread in insects and may confer adaptive advantages such as predator avoidance and aggregation of hatchlings. In Locusta migratoria, two mechanisms have been proposed to underlie hatching synchrony within egg pods: maternal phase effects and embryo–embryo interactions. This study examined whether maternal phase influences within-pod hatching synchrony when embryo–embryo communication is experimentally manipulated. Eggs from solitarious and gregarious females were maintained either in contact (clumped) or individually separated and incubated at 30°C under continuous illumination. Mean hatching time, within-batch variance in hatching time, and the duration from 10 to 90% hatching were analyzed. Gregarious eggs laid by crowd-reared adults were slightly larger and hatched earlier on average than solitarious eggs laid by isolation-reared adults under both egg conditions, confirming a phase-dependent difference in embryonic developmental rate. In contrast, hatching synchrony was strongly influenced by egg condition: Most clumped eggs hatched within a few hours, whereas separated eggs hatched later and over a much broader time span. No significant phase-dependent differences were detected in either the variance of hatching time or the 10–90% hatching period. These findings indicate that maternal phase primarily influences embryonic developmental rate, whereas physical contact among eggs is essential for the final synchronization of hatching within an egg pod. The results highlight the importance of distinguishing embryonic developmental timing from within-pod hatching synchrony.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148942104","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

Falling of terrestrial isopods (Isopoda: Oniscidea) into a stream: Possibility of downstream dispersal 陆生等足类动物（等足目：蛇足目）落入溪流：向下游扩散的可能性

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-08-25 DOI: 10.1111/ens.70036

Takehiro Kubo, Shigenori Karasawa, Hirokazu Haga

{"title":"Falling of terrestrial isopods (Isopoda: Oniscidea) into a stream: Possibility of downstream dispersal","authors":"Takehiro Kubo, Shigenori Karasawa, Hirokazu Haga","doi":"10.1111/ens.70036","DOIUrl":"https://doi.org/10.1111/ens.70036","url":null,"abstract":"This study was conducted in a riparian zone and small stream in western Japan to investigate the potential downstream movement and dispersal of terrestrial isopods (Crustacea, Isopoda, Oniscidea) via a stream. A total of 345 individuals were captured using pitfall traps on the riparian forest floor, while bankside traps along the streambank captured 416 individuals. Most individuals belonged to the families Ligiidae (three species) and Armadillidae (two species). Capture rates per crossable trap perimeter (individuals m−1 day−1) were 0.39 ± 0.02 (mean ± SE) for pitfall traps and 0.77 ± 0.14 for bankside traps, with the latter being 1.97 times higher, indicating that terrestrial isopods do not actively avoid streams and frequently fall into them. Generalized Linear Mixed Models (GLMMs) analysis further revealed that the likelihood of females falling into the stream was higher than that of males. Drift-net surveys conducted once in July and August (24 h each) captured four live individuals, which were converted to represent the number of individuals traversing the channel cross-section per day, resulting in 13.7 individuals for Ligiidae in July and 5.0 (Ligiidae) and 5.1 (Armadillidae) in August. Additionally, the stomach contents of 152 amago trout (Oncorhynchus masou ishikawae Jordan & McGregor, 1925) were examined to evaluate predation during the downstream drift, and terrestrial isopods were detected in only six individuals (4%). These results suggest that terrestrial isopods frequently fall into rivers, survive while drifting, experience minimal predation from fish and potentially disperse downstream via the river.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148848614","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

Sibling species of the Cotesia inducta complex (Hymenoptera: Braconidae) sympatrically parasitising heterogeneous lycaenid larvae associated with ants 寄生于与蚂蚁相关的异种lycaenid幼虫的同族寄生蜂复合体（膜翅目：小蜂科）

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-08-19 DOI: 10.1111/ens.70035

Yui Nakabayashi, Kaoru Maeto, Shunpei Fujie, Issei Ohshima

{"title":"Sibling species of the Cotesia inducta complex (Hymenoptera: Braconidae) sympatrically parasitising heterogeneous lycaenid larvae associated with ants","authors":"Yui Nakabayashi, Kaoru Maeto, Shunpei Fujie, Issei Ohshima","doi":"10.1111/ens.70035","DOIUrl":"https://doi.org/10.1111/ens.70035","url":null,"abstract":"Approximately 75% of lycaenid butterfly species in the world associate with ants during their larval stages to gain protection against natural enemies such as parasitoids. Despite intensive studies on lycaenid–ant interactions, parasitoids exploiting myrmecophilous hosts remain poorly understood, thereby limiting our understanding of the eco-evolutionary dynamics of parasitoid–host interactions. Here, three sibling species of Cotesia Cameron (Hymenoptera: Braconidae) parasitising ant-associated lycaenid larvae in Japan were identified, and their ecological differentiation within this parasitoid group was investigated. We propose the Cotesia inducta complex, comprising Cotesia inducta (Papp), Co. sp. aff. inducta and Co. suzukii sp. nov. Co. inducta is recorded from Japan (Honshu) for the first time, and Co. suzukii sp. nov. is described and illustrated from Japan (Honshu and Kyushu). Co. suzukii sp. nov. is a specialist parasitoid of Arhopala japonica (Murray) (Theclinae) on Quercus spp., whereas Co. inducta exhibits a broad host range across multiple lycaenid subfamilies (Curetinae, Polyommatinae and Theclinae) in Europe and Japan. Mitochondrial DNA analyses reveal the monophyly of the Co. inducta complex, as well as that of Co. inducta and Co. suzukii sp. nov. Both species are multivoltine; however, Co. inducta exploits different host species seasonally, whereas Co. suzukii sp. nov. consistently utilises Ar. japonica. Moreover, Co. inducta primarily parasitises flower-feeding hosts, whereas Co. suzukii sp. nov. only uses leaf-feeding hosts, indicating that host-feeding habitat contributes to diversification within the Co. inducta complex. These findings provide fundamental ecological information on parasitoids associated with myrmecophilous butterflies.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.70035","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148784169","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

Forest-associated distribution of Sympetrum frequens (Odonata: Libellulidae), a common, regionally declining meadowhawk in Japan 日本一种常见的、区域性衰退的草地兀鹰的森林伴生分布

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-08-06 DOI: 10.1111/ens.70031

Wataru Higashikawa

{"title":"Forest-associated distribution of Sympetrum frequens (Odonata: Libellulidae), a common, regionally declining meadowhawk in Japan","authors":"Wataru Higashikawa","doi":"10.1111/ens.70031","DOIUrl":"https://doi.org/10.1111/ens.70031","url":null,"abstract":"Sympetrum frequens, a common yet regionally declining dragonfly in Japan, is likely to use forests as seasonal habitats during the adult stage. After emerging from lowland wetlands in early summer, adults move to montane forests to avoid summer heat, and they return to the lowlands for reproduction in autumn, where they roost and forage in nearby forests. However, the spatial patterns of forest habitats remain unclear, probably because detecting individuals within forests is difficult. In contrast, after leaving forests, they become observable in foothills in late summer and in lowland paddy fields during autumn, where their distribution may retain the spatial legacies of recent forest use. This study analyzed the relationships between adult abundance observed during these periods and the surrounding forest landscapes across multiple spatial scales and elevation bands in central Japan to infer the forest habitats they previously occupied. In late summer, a significant positive effect of forest area at elevations of 400–600 m (average summer temperature range: 23.8–25.4°C) within 5 km best explained the number of adults at foothills. In autumn, adult abundance in the lowland paddy fields was best explained by a significant hump-shaped relationship with forest area within 5 km, peaking at approximately 40% forest cover. These results suggest spatial and climatic structuring of their seasonal forest habitats, which may advance our ecological understanding and inform conservation planning for this species. Furthermore, this study underscores the value of landscape analysis that uses the outside-forest abundance of multi-habitat species to identify forest habitats.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752836","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

Combined effects of rearing temperature and photoperiod on desiccation resistance in the water strider Aquarius paludum amamiensis 饲养温度和光周期对水黾干旱性的联合影响

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-07-30 DOI: 10.1111/ens.70034

Nobuhiro Matsuoka

{"title":"Combined effects of rearing temperature and photoperiod on desiccation resistance in the water strider Aquarius paludum amamiensis","authors":"Nobuhiro Matsuoka","doi":"10.1111/ens.70034","DOIUrl":"https://doi.org/10.1111/ens.70034","url":null,"abstract":"Desiccation resistance is an important physiological trait in insects, but how seasonal cues jointly affect this trait remains poorly understood in gerrid water striders. This study examined how temperature and photoperiod from the nymphal stage through early adulthood influence desiccation resistance in Aquarius paludum amamiensis (Miyamoto). First-instar nymphs were reared under four combinations of high or low temperature and long- or short-day photoperiod. Desiccation resistance was evaluated 30 days after adult emergence by measuring survival time, water loss at death, water loss rate and initial body water content. Survival time was significantly affected by temperature, photoperiod and their interaction, with the shortest survival under high-temperature–long-day conditions. Water loss rate also showed a significant interaction and was higher under high-temperature–long-day than high-temperature–short-day conditions. Initial body water content was generally lower at high than low temperature. Reproductive activity was strongly affected by temperature: Nearly all females reared at high temperature oviposited, and total egg production was substantially greater than at low temperature. Including wing morph as an explanatory variable did not alter the principal interactions. These results indicate that the effect of photoperiod on desiccation resistance depends strongly on temperature, with long-day conditions reducing survival primarily at high temperature. Because reproductive activity was affected mainly by temperature, the interaction in desiccation resistance may involve photoperiod-dependent regulation of water balance beyond reproductive maturation alone.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616710","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

From hindrance to indirect protection: Ant-mediated enemy-free space for gall midges (Cecidomyiidae) on Macaranga myrmecophytes (Euphorbiaceae) 从阻碍到间接保护：瘿蚊（cecidomiidae）对大胡兰（Macaranga myrmecophytes, Euphorbiaceae）的抗介导无敌空间

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-07-28 DOI: 10.1111/ens.70032

Usun Shimizu-kaya, Takao Itioka, Paulus Meleng

{"title":"From hindrance to indirect protection: Ant-mediated enemy-free space for gall midges (Cecidomyiidae) on Macaranga myrmecophytes (Euphorbiaceae)","authors":"Usun Shimizu-kaya, Takao Itioka, Paulus Meleng","doi":"10.1111/ens.70032","DOIUrl":"https://doi.org/10.1111/ens.70032","url":null,"abstract":"Interspecific interactions involving ants range from antagonistic to mutually beneficial, depending on the context. Myrmecophytic Macaranga trees form symbiotic associations with ants, whose aggressive behavior protects the trees against herbivorous insects. Nevertheless, galls induced by cecidomyiid midges still occur on these myrmecophytes. We hypothesized that the midge larvae or pupae that form their galls on Macaranga myrmecophytes can exploit the enemy-free space provided by the ants, which continuously patrol the myrmecophytes. To test this hypothesis, we conducted a field survey of the galls of Schizomyiina sp. 2 on the leaves of M. beccariana in a Bornean rainforest. We found that the mean number of galls of Schizomyiina sp. 2 on a leaf and the parasitism rate of the midges by parasitoid wasps were significantly higher on trees without ant protection than on trees with ant protection. These results support our hypothesis and suggest that enemy-free space indirectly provided by ants is an important benefit of using myrmecophytic plants for herbivorous insects, even though they must incur the cost of becoming immune to the ants' aggression.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"29 3","pages":""},"PeriodicalIF":0.8,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/ens.70032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616350","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

A novel underside water surface-walking behavior in larvae of Hydroporus uenoi Nakane, 1963 (Coleoptera: Dytiscidae) 水孢子虫水下表面行走行为的研究，1963（鞘翅目：蝶蛾科）

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-07-27 DOI: 10.1111/ens.70033

Kohei Watanabe, Masakazu Hayashi

引用次数: 0

Influence of fourth-instar larval nutrition on ovariole development in Harmonia axyridis (Coleoptera: Coccinellidae) 四龄幼虫营养对毛瓢虫卵巢发育的影响（鞘翅目：瓢虫科）

IF 0.8 4区农林科学

Entomological Science Pub Date : 2026-07-09 DOI: 10.1111/ens.70029

Fukuaki Yamamoto, Naoya Osawa

引用次数: 0