Jin Hagiwara, Leon Nozawa, Itsuki Ohtsu, Tadashi Shinohara, Hiroki Gotoh
{"title":"Pupal RNA interference methods for analyzing adult development in stag beetles","authors":"Jin Hagiwara, Leon Nozawa, Itsuki Ohtsu, Tadashi Shinohara, Hiroki Gotoh","doi":"10.1111/ens.12548","DOIUrl":"10.1111/ens.12548","url":null,"abstract":"<p>Holometabolous insects dramatically change their morphology via molt, both from larva to pupa and from pupa to adult. In nonmodel insects, RNA interference (RNAi) is a strong tool for analyzing gene function during postembryonic development. In many cases, larval RNAi is effective for analyzing genes involved in morphogenesis via metamorphosis. However, RNAi of genes involved in development sometimes results in lethality before animals metamorphose to pupae and/or adults, making it impossible to analyze their function during the pupal period. In this study, we establish a pupal RNAi system in the stag beetle <i>Dorcus rectus</i>. We selected the genes <i>white</i> and <i>scarlet</i> for RNAi knockdown to investigate appropriate injection timing and position. Both genes are known to be involved in eye pigmentation. By using these candidate genes, we demonstrate the potential of pupal RNAi in this experimental system. This method will be useful for analyzing pupal-specific morphogenesis including fine-shaping of the enlarged male mandible in this species.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43045922","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}
Naoyuki Fujiyama, Hideki Ueno, Sih Kahono, Sri Hartini, Haruo Katakura
{"title":"A solanum beetle on a fabaceous weed: Possible rapid progress of adaptation to a novel host-plant in a geographical context","authors":"Naoyuki Fujiyama, Hideki Ueno, Sih Kahono, Sri Hartini, Haruo Katakura","doi":"10.1111/ens.12547","DOIUrl":"10.1111/ens.12547","url":null,"abstract":"<p>Our knowledge on how the local distribution pattern of ordinary and novel hosts promotes or hinders the progress of adaptation to the novel hosts by phytophagous insects is limited. The herbivorous ladybird beetle <i>Henosepilachna vigintioctopunctata</i> (Coleoptera: Coccinellidae) depends mainly on solanaceous plants as hosts; the major wild host of this beetle species in Java, Indonesia, is <i>Solanum torvum</i>. However, in several regions of Southeast Asia, including Java, <i>H. vigintioctopunctata</i> also occurs on the introduced fabaceous weed, <i>Centrosema molle</i>. Circumstantial evidence indicates that the use of <i>C. molle</i> by beetles became frequent in the very early 2000s in East Java. In the present study, based on laboratory and field data obtained from 2003 to 2005, we evaluated the degree of adaptation to <i>C. molle</i> by <i>H. vigintioctopunctata</i> populations from East Java and documented the geographic pattern of host-plant distribution in East Java. Laboratory experiments revealed that the beetles from East Java possessed the highest degree of adaptation to <i>C. molle</i> among the beetle populations thus far investigated, suggesting that the adaptation to <i>C. molle</i> by beetles proceeded quite rapidly in East Java in the early 2000s. Meanwhile, field surveys showed that the habitats in East Java consisted of mosaics with sites where only <i>C. molle</i> was distributed and sites where <i>C. molle</i> and solanaceous plants co-occurred. We discussed the role of such geographical structure of habitats in promoting the rapid adaptation of <i>H. vigintioctopunctata</i> to <i>C. molle</i> in East Java.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41306859","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}
{"title":"Difference in the responses of male cicada Meimuna opalifera to the two parts of conspecific calling song","authors":"Takeru Kodama, Eiiti Kasuya, Haruki Tatsuta","doi":"10.1111/ens.12550","DOIUrl":"10.1111/ens.12550","url":null,"abstract":"<p><i>Meimuna opalifera</i> males emit extremely complex calling songs, with the main section comprising two parts. To investigate whether these two parts of the calling song have different meanings for the receivers, we conducted playback experiments. We counted and compared the number of response calls when different types of sound stimuli were presented under laboratory conditions. <i>Meimuna opalifera</i> males emitted significantly greater response calls during the playback of stimuli containing the former part of the songs than those containing the latter part only. This suggests that <i>M. opalifera</i> males tend to respond by detecting characteristics in the former part of the songs. Because the peak frequencies were similar between the former and the latter parts, the temporal patterns of the songs might be important in short-range communication between males of <i>M. opalifera</i>.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41251875","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}
Sara Y. M. Watanabe, Larissa F. Ferreira, Marília R. P. Cruz, Ana P. A. Araújo, Og Desouza, Paulo F. Cristaldo
{"title":"It is not only group size: Soldiers also modulate the tolerance to insecticide in termites (Blattodea: Isoptera)","authors":"Sara Y. M. Watanabe, Larissa F. Ferreira, Marília R. P. Cruz, Ana P. A. Araújo, Og Desouza, Paulo F. Cristaldo","doi":"10.1111/ens.12546","DOIUrl":"10.1111/ens.12546","url":null,"abstract":"<p>The survivorship of social insects is known to increase with group size, even in situations of stress, such as starvation and exposure to insecticides. However, in termites, studies have been undertaken only with workers, disregarding the possible effect of soldiers. The role of soldiers in the termite colonies goes beyond defense, mainly in <i>Nasutitermes</i> species. It is already known that soldiers initiate the foraging as well as improve the decision-making of food resources. Here, we evaluated the effect of group size and the presence of soldiers on exposure to sublethal doses of the insecticide imidacloprid in <i>Nasutitermes corniger</i> (Termitidae: Nasutitermitinae). To do so, toxicity bioassays were undertaken initially to determine the dose of the insecticide required to kill 50% of the <i>N. corniger</i> population (LD<sub>50</sub>) to be used in the main experiments. Survival bioassays were then carried out with termite groups, with and without soldiers, in different sizes (6, 10, 14, 22, 26, 30 and 60), exposed and nonexposed to insecticide. In general, the mean time to death of termites increases linearly with group size. However, the mean time to death in groups with soldiers was significantly longer only in groups exposed to the insecticide. Our results indicate that soldiers can help to increase the tolerance of nasute termite groups to insecticides, in addition to the group size, as already shown in the previous study. The size of the group and social context could, therefore, modulate behavioral and/or physiological responses that enhance the ability to survive under stressful situations.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43212587","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}
{"title":"The second phantom aquatic leaf beetle in Japan: Macroplea mutica rediscovery in the wetlands (Coleoptera: Chrysomelidae)","authors":"Naoyuki Nakahama, Ryosuke Okano, Yuichiro Nishimoto, Yusuke Nakatani, Asato Noishiki, Naoki Ogawa","doi":"10.1111/ens.12545","DOIUrl":"10.1111/ens.12545","url":null,"abstract":"<p>Wetland biodiversity is currently declining on a global scale. Wetland biodiversity understanding is critical for determining the wetlands' conservation value. In this study, <i>Macroplea</i> Samouelle, 1819 (Coleoptera: Chrysomelidae) was discovered in Aomori Prefecture, Honshu Island, Japan. Only two <i>Macroplea</i> species have been recorded in Japan, <i>M. japana</i> (Jacoby, 1885) and <i>M. mutica</i> (Fabricius, 1792). <i>Macroplea japana</i> had been unrecorded for 60 years before being rediscovered in Honshu Island in 2022, and a single adult <i>M. mutica</i> female was discovered in Hokkaido Prefecture in 2003. The discovered individuals were concluded to be <i>M. mutica</i> based on morphological and molecular analyses. Although morphological differences were observed with the Eurasian <i>M. mutica</i> individuals, the male genitalia was nearly identical to <i>M. mutica.</i> For the molecular phylogenetic analysis based on <i>COI</i> and <i>28S</i> sequences, <i>Macroplea</i> individuals in Japan were clustered with <i>M. mutica</i> on the Eurasian Continent. This is the first record of this species on Honshu Island (and the second in Japan), as well as the first record of adult males. This species would require conservation policies and additional distributional surveys.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 2","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44815589","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}
{"title":"Notes on the foraging habits of adult Protohermes dobsonflies (Megaloptera: Corydalidae): Further evidence for anthophilous megalopterans","authors":"Naoto Sugiura, Kei-ichiro Shikata, Satoshi Miyazaki","doi":"10.1111/ens.12542","DOIUrl":"10.1111/ens.12542","url":null,"abstract":"As in other megalopterans, the life of adult dobsonflies in the natural habitats remains largely unexplored. Here, we report the foraging habits of the nocturnal dobsonflies Protohermes grandis and Protohermes immaculatus. Our field observations from a close distance revealed that adult P. grandis feeds on the floral nectar of the Japanese chestnut Castanea crenata (Fagaceae). Moreover, based on strong circumstantial evidence (the finding of a dozen pollen‐bearing adults and their pollen‐containing excrement), we concluded that adult P. immaculatus routinely visit the flowers of Schima wallichii ssp. noronhae (Theaceae). The present study is the first one to document floral resource utilization by adult dobsonflies in their natural habitats, and provides further evidence for anthophilous corydalids. We have briefly discussed why the flower‐visiting habits of corydalids have been missed so far.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47003514","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}
{"title":"Effect of male–female relatedness on aggression and inbreeding in an egg parasitoid wasp","authors":"Si-Yu Yin, Yu-Mei Tao, Peng-Cheng Liu","doi":"10.1111/ens.12541","DOIUrl":"10.1111/ens.12541","url":null,"abstract":"<p>Aggressive behavior is important for acquiring crucial resources in many animals. As such behavior is costly, selection favors contestants that can accurately gather information regarding the likely costs and benefits of conflict to enable appropriate tactical decisions. Mate choice based on relatedness is widespread among animals and has severe consequences. Theoretically, due to the potential costs of inbreeding, contestants may benefit from discriminating between relative and nonrelative mates and adjusting their behavior accordingly. If inbreeding results in fitness costs, related mates might be perceived as less valuable and individuals might be expected to invest less in costly aggression, and vice versa. However, the role of male–female relatedness in aggression has been less addressed. The egg parasitoid wasp <i>Anastatus disparis</i>, which exhibits extreme male–male aggressive behavior for mating opportunities, was used as an experimental model to explore the role of male–female relatedness in aggression. Inconsistent with our prediction, male–female relatedness had no significant effect on male–male fighting frequency or intensity in <i>A. disparis</i>. The ability of males to discriminate relative from nonrelative females is a prerequisite for male–female relatedness to affect males’ aggression. However, <i>A. disparis</i> males did not exhibit any mating preferences for relative or nonrelative females. Besides, inbreeding did not result in depression in terms of longevity, fecundity or sex ratio in <i>A. disparis</i>. Our finding of no effect of male–female relatedness on male–male fights in <i>A. disparis</i> may be caused by a lack of kin discrimination ability or/and a lack of benefits from discriminating relatives from nonrelatives.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43220042","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}
{"title":"Phylogenetic and morphological analyses of Japanese Aquarius water strider, with a new synonym","authors":"Naoki Hiraishi, Tomoya Suzuki, Ryosuke Matsushima, Shin-ya Ohba","doi":"10.1111/ens.12544","DOIUrl":"10.1111/ens.12544","url":null,"abstract":"<p>The genus <i>Aquarius</i>, of the subfamily Gerrinae, was formerly divided into two species and one subspecies in Japan (<i>A</i>. <i>paludum paludum</i>, <i>A</i>. <i>paludum amamiensis</i> and <i>A</i>. <i>elongatus</i>, respectively). <i>Aquarius haliplous</i> Yasunaga et al. 2018 has recently been described as a new species, which occurs in brackish waters of Nagasaki Prefecture and is found sympatrically with the widely distributed species, <i>A</i>. <i>p</i>. <i>paludum</i>. However, they are considered to be speciated, with no cross-breeding. In this study, molecular phylogenetic and morphological analyses were undertaken using the mitochondrial DNA <i>COI</i> (529 bp) and nuclear DNA histone H3 (314 bp) gene regions to investigate the genetic and morphological differentiation in the genus <i>Aquarius</i>, including <i>A</i>. <i>haliplous</i>, throughout Japan (including the islands). The results show that, unlike <i>A</i>. <i>p</i>. <i>paludum</i>, <i>A</i>. <i>p</i>. <i>amamiensis</i> and <i>A</i>. <i>haliplous</i>, <i>A</i>. <i>elongatus</i> displays substantial genetic differentiation. Considering that, although morphological differences exist in the antennae of <i>A</i>. <i>p</i>. <i>paludum</i> and <i>A</i>. <i>p</i>. <i>amamiensis</i>, <i>A</i>. <i>haliplous</i> has no clear genetic or morphological difference from <i>A</i>. <i>p</i>. <i>paludum</i>, and hence cannot be classified as a distinct species. Therefore, we propose that <i>A</i>. <i>haliplous</i> be synonymized with <i>A</i>. <i>paludum</i>.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43096265","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}
Shigeki Ogata, Atsuhiro Nishiwaki, Kanji Yamazoe, Kyoko Sugai, Teruhiko Takahara
{"title":"Discovery of unknown new ponds occupied by the endangered giant water bug Kirkaldyia deyrolli (Hemiptera: Heteroptera: Belostomatidae) by combining environmental DNA and capture surveys","authors":"Shigeki Ogata, Atsuhiro Nishiwaki, Kanji Yamazoe, Kyoko Sugai, Teruhiko Takahara","doi":"10.1111/ens.12540","DOIUrl":"10.1111/ens.12540","url":null,"abstract":"Basic ecological information (e.g. habitat or distribution) is indispensable for conserving endangered species. The giant water bug Kirkaldyia deyrolli is an aquatic insect in the large stink bug family (Belostomatidae). It inhabits ponds and is a critically endangered species. In this study, we developed a species‐specific primer–probe set (the cytochrome c oxidase I region in mitochondrial DNA) that was used in real‐time polymerase chain reaction (PCR) assays to detect K. deyrolli environmental DNA (eDNA). Next, using eDNA analysis, we investigated the presence of K. deyrolli in 89 study ponds (including one pond that had already been identified as the habitat of this species) in Shimane Prefecture, Japan. The eDNA of K. deyrolli was detected in 11 of these 89 ponds. Furthermore, when the traditional method of direct capture survey was carried out in four of the 10 ponds where K. deyrolli eDNA had been detected and no prior occupancy information for this species was available, the capture of one K. deyrolli (female) was successful in only one pond. This study showed that combining eDNA analysis and direct capture methods can lead to discovering previously unknown habitats essential for conserving an endangered species.","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45132588","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}
{"title":"Myrmecophily of Horniolus fortunatus (Coleoptera: Coccinellidae)","authors":"Hiroyuki Yoshitomi","doi":"10.1111/ens.12543","DOIUrl":"10.1111/ens.12543","url":null,"abstract":"<p>The biology of <i>Horniolus fortunatus</i> (Lewis, 1896) has been fragmentarily reported, but what the larvae and adults feed on and the immature stages are still unknown. In this article, I report that this coccinellid adult and larva feed on mealybugs (<i>Planococcus</i> sp.) living in the nest of the ant <i>Crematogaster matsumurai</i> Forel, 1901.</p>","PeriodicalId":11745,"journal":{"name":"Entomological Science","volume":"26 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45762510","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}