Journal of insect physiology最新文献

Plastic responses in sperm expenditure to sperm competition risk in black soldier fly (Hermetia illucens, Diptera) males

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2025-01-30 DOI: 10.1016/j.jinsphys.2025.104751

Frédéric Manas, Carole Labrousse, Christophe Bressac

{"title":"Plastic responses in sperm expenditure to sperm competition risk in black soldier fly (Hermetia illucens, Diptera) males","authors":"Frédéric Manas, Carole Labrousse, Christophe Bressac","doi":"10.1016/j.jinsphys.2025.104751","DOIUrl":"10.1016/j.jinsphys.2025.104751","url":null,"abstract":"<div><div>In polyandrous species, competition between males for offspring paternity goes on after copulation through the competition of their ejaculates for the fertilisation of the female’s oocytes. Given that males allocating more spermatozoa often have greater fertilisation success, different models of sperm competition predict adaptive plasticity in male sperm production and allocation. These predictions were tested experimentally in the black soldier fly (BSF) <em>Hermetia illucens</em>. In this farmed insect, adult biology is little known despite the economic interest of larvae for bioconversion, and as authorized feedstuff. In lab conditions, two sets of experiments were carried out to modify the risk of sperm competition perceived by males. The first consisted of placing adult males alone or in groups of 10 – modifying the mean risk of sperm competition – and then measuring their sperm production. The second took place at the beginning of copulation; pairs with males from the two treatments were transferred to different contexts of immediate risk of sperm competition: empty cages, cages containing 10 males, or cages containing 10 females. In all cases, spermatozoa transferred to mated females were counted. Males reared in groups of 10 showed more spermatozoa in their seminal vesicles than males reared alone. Regarding sperm allocation, females that mated in the presence of conspecifics – either 10 males or 10 females – received more spermatozoa than those that mated in isolation. In BSF, sperm production and allocation are influenced by the risk of sperm competition, demonstrating reproductive plasticity in response to socio-sexual conditions.</div></div>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":"161 ","pages":"Article 104751"},"PeriodicalIF":2.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Acetylcholine and Malpighian tubules of the kissing bug, Rhodnius prolixus: Evidence for expression of the non-neuronal cholinergic system and a diuretic action of acetylcholine

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2025-01-29 DOI: 10.1016/j.jinsphys.2025.104752

Ian Orchard, Areej N. Al-Dailami, Angela B. Lange

{"title":"Acetylcholine and Malpighian tubules of the kissing bug, Rhodnius prolixus: Evidence for expression of the non-neuronal cholinergic system and a diuretic action of acetylcholine","authors":"Ian Orchard, Areej N. Al-Dailami, Angela B. Lange","doi":"10.1016/j.jinsphys.2025.104752","DOIUrl":"10.1016/j.jinsphys.2025.104752","url":null,"abstract":"<div><div>Acetylcholine (ACh) and its signaling pathways are expressed in peripheral tissues in mammals, leading to the concept of a non-neuronal cholinergic signaling system. This non-neuronal ACh is now known to participate as an autocrine/paracrine in many processes, including transport of ions and water, immunity, and reproduction. Non-neuronal cholinergic signaling in insects has only recently been explored, with transcriptome analyses disclosing the presence of transcripts for pivotal components of the cholinergic system in non-neuronal tissues, including Malpighian tubules (MTs), ovaries, hemocytes, and fat body. A recent transcriptome analysis of MTs of the Chagas disease vector <em>Rhodnius prolixus</em> revealed the presence of transcripts for muscarinic ACh receptors and for acetylcholinesterase, raising the possibility that non-neuronal ACh may play a role in the control of MTs. Here we provide evidence for a non-neuronal ACh signaling pathway in MTs of <em>R. prolixus</em>. Transcripts for ACh signaling are expressed, and ACh is capable of stimulating small increases in secretion by isolated MTs (small, relative to the true diuretic neurohormones in <em>R. prolixus</em>). The effects of ACh are mimicked by carbachol and pilocarpine, with atropine inhibiting ACh- and pilocarpine-stimulated secretion. Blood gorging alters expression of transcripts for ACh signaling. We discuss the physiological relevance for ACh since MTs are much more than diuresis; they play major roles in immunity, detoxification, and in tolerance to overall stress. Perhaps ACh is a signaling component of these essential functions that might require an increase in secretion rate by MTs that is separate from the well described rapid post-prandial diuresis.</div></div>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":"161 ","pages":"Article 104752"},"PeriodicalIF":2.3,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Hemocyanin contributes to embryonic adaptation to hypoxia in the migratory locust 血青素有助于迁徙蝗虫对缺氧的胚胎适应。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2025-01-15 DOI: 10.1016/j.jinsphys.2025.104750

Xianliang Huang , Yuxing Xiao , Yaru Yang , Jiaqi Duan , Deguang Liu

{"title":"Hemocyanin contributes to embryonic adaptation to hypoxia in the migratory locust","authors":"Xianliang Huang , Yuxing Xiao , Yaru Yang , Jiaqi Duan , Deguang Liu","doi":"10.1016/j.jinsphys.2025.104750","DOIUrl":"10.1016/j.jinsphys.2025.104750","url":null,"abstract":"<div><div>Ambient hypoxia can pose a major threat to the survival of metazoan organisms, especially insect embryos. Hemocyanin exhibits dominant expression in insect embryos, but its specific roles in hypoxia adaptation remain unexplored. Soil-dwelling locust eggs may frequently experience hypoxia during development. A comprehensive analysis of physiological and biochemical characters of hemocyanin was conducted in the embryos of migratory locust <em>Locusta migratoria</em>. Our results demonstrated that the revolution process was the critical hypoxia-sensitive event during locust embryogenesis. Hemocyanin presented a prominent expression in the revolution stage and exhibited strong responses to hypoxia. The relative duration of revolution was correlated negatively with the expression of hemocyanin subunit 2 (HC2), suggesting that HC2 might be closely associated with hypoxia adaptation of locust embryos. Furthermore, a <em>HC2</em> mutant locust strain was established using the CRISPR/Cas9 technology, and higher hypoxia sensitivity was found for HC2-deficient locust embryos. Knockdown of <em>HC2</em> increased anaerobic metabolism and oxidative stress while reducing oxidative metabolism. Overall, these findings clearly demonstrated the pivotal roles of hemocyanin in hypoxia adaptation of insect embryos.</div></div>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":"161 ","pages":"Article 104750"},"PeriodicalIF":2.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143006767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Successful oral RNA interference efficiency in the silkworm Bombyx mori through nanoparticle-shielded dsRNA delivery 通过纳米粒子屏蔽的dsRNA递送，家蚕成功的口服RNA干扰效率。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2025-01-13 DOI: 10.1016/j.jinsphys.2025.104749

Jisheng Liu , Yang Yang , Qiangjun Yang , Xianfeng Lin , Yuming Liu , Ziyang Li , Luc Swevers

{"title":"Successful oral RNA interference efficiency in the silkworm Bombyx mori through nanoparticle-shielded dsRNA delivery","authors":"Jisheng Liu , Yang Yang , Qiangjun Yang , Xianfeng Lin , Yuming Liu , Ziyang Li , Luc Swevers","doi":"10.1016/j.jinsphys.2025.104749","DOIUrl":"10.1016/j.jinsphys.2025.104749","url":null,"abstract":"<div><div>Double-stranded RNA (dsRNA) mediated RNA interference (RNAi) is a tool in functional gene study and pest control. However, RNAi efficiency in Lepidoptera is low compared to the RNAi sensitive Coleoptera. Previous studies on RNAi in the silkworm <em>Bombyx mori</em>, the lepidopteran model insect, were performed by injection only. Successful oral RNAi in the silkworm has never been reported yet. This study aims to develop a successful oral dsRNA delivery method to the silkworm larvae. Chitosan is an economical and biodegradable polymer. Chitosan/dsRNA nanoparticles were prepared by self-assembly. These nanoparticles were found to be stable when incubated in the midgut juice of the silkworm larvae, whereas naked dsRNA underwent complete degradation. Chitosan/dsRNA nanoparticles targeting various immune genes in oral administration to the silkworm larvae mediated significant knockdown of gene transcript. This silencing effect resulted in smaller larvae and cocoons when the silkworms were fed with Chitosan/dsRNA nanoparticles targeting <em>BmToll9-2</em> gene, indicating that immune genes might be used as targets in pest control. Optimization of the chitosan/dsRNA nanoparticles maintained an RNAi effect from 3-5 days. The efficient RNAi was due to the persistence of nanoparticle-shielded dsRNA in the larvae. The above findings contribute to the first oral RNAi report in the silkworm, which facilitates the application of RNAi in insects and oral RNAi in pest control.</div></div>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":"161 ","pages":"Article 104749"},"PeriodicalIF":2.3,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143006786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Intestinal flow and digestive parameters of Lutzomyia longipalpis larvae 长掌Lutzomyia幼虫肠道流量及消化参数。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2025-01-13 DOI: 10.1016/j.jinsphys.2025.104748

Luccas Gabriel Ferreira Malta , Bianca Stacanelli Ribeiro , Davi Viegas-Melo, Marques Serafim Pinho-Junior, Maurício Roberto Viana Sant’Anna, Marcos Horário Pereira, Nelder Figueiredo Gontijo

{"title":"Intestinal flow and digestive parameters of Lutzomyia longipalpis larvae","authors":"Luccas Gabriel Ferreira Malta , Bianca Stacanelli Ribeiro , Davi Viegas-Melo, Marques Serafim Pinho-Junior, Maurício Roberto Viana Sant’Anna, Marcos Horário Pereira, Nelder Figueiredo Gontijo","doi":"10.1016/j.jinsphys.2025.104748","DOIUrl":"10.1016/j.jinsphys.2025.104748","url":null,"abstract":"<div><div><em>Lutzomyia longipalpis</em> Lutz & Neiva, 1912 (Diptera, Psychodidae), is the primary vector of <em>Leishmania infantum</em> Nicole, 1908, the etiological agent of American visceral leishmaniasis. During their development, sandfly larvae pass through four instars, consuming soil particles enriched with microorganisms and decomposing organic material. In numerous insect species, the intestinal epithelium not only secretes digestive enzymes and absorbs digested nutrients but also carries out additional functions, such as regulating luminal pH and facilitating the absorption or secretion of ions and water. The transport of ions and water plays a crucial role in the establishment of a countercurrent flow responsible for recycling soluble digestive enzymes. This study aimed to explore specific aspects of digestion <em>in L. longipalpis</em> larvae that remain poorly understood. We measured the intestinal flow within the endoperitrophic space, which varied depending on the type of diet offered to the larvae, with an average total time of 191 min. Additionally, we demonstrated the countercurrent flow in <em>L. long</em>ipalpis larvae. Finally, we showed that the production of digestive enzymes can be modulated by nutrient availability, particularly by the amino acids in the larval diet. The higher the amino acids concentration, the higher the trypsin activity. On the other hand, the aminopeptidase activity was poorly influenced by the amino acids concentration.</div></div>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":"161 ","pages":"Article 104748"},"PeriodicalIF":2.3,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143006779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Wolbachia infection modifies phloem feeding behavior but not plant virus transmission by a hemipteran host. 沃尔巴克氏体感染改变韧皮部摄食行为，但不改变植物病毒通过半足类宿主传播。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2024-12-27 DOI: 10.1016/j.jinsphys.2024.104746

Gina M Angelella, Jillian J Foutz, Joanna Galindo-Schuller

{"title":"Wolbachia infection modifies phloem feeding behavior but not plant virus transmission by a hemipteran host.","authors":"Gina M Angelella, Jillian J Foutz, Joanna Galindo-Schuller","doi":"10.1016/j.jinsphys.2024.104746","DOIUrl":"10.1016/j.jinsphys.2024.104746","url":null,"abstract":"<p><p>Wolbachia-infected and uninfected subpopulations of beet leafhoppers, Circulifer tenellus (Baker) (Hemiptera: Cicadellidae), co-occur in the Columbia Basin region of Washington and Oregon. While facultative endosymbionts such as Hamiltonella defensa have demonstrably altered feeding/probing behavior in hemipteran hosts, the behavioral phenotypes conferred by Wolbachia to its insect hosts, including feeding/probing, are largely understudied. We studied the feeding/probing behavior of beet leafhoppers with and without Wolbachia using electropenetrography, along with corresponding inoculation rates of beet curly top virus, a phloem-limited plant pathogen vectored by beet leafhoppers. Insects carrying the virus with and without Wolbachia were individually recorded for four hours while interacting with a potato plant, and wavelengths annotated following established conventions. Virus inoculation rates and the duration of phloem salivation events did not vary. Wolbachia-infected insects more than tripled the duration of phloem ingestion, but despite this, Wolbachia infection was linked with marginally lower, not enhanced, acquisition. Regardless, results suggest potential for Wolbachia to increase the acquisition rate of other phloem-limited plant pathogens.</p>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":" ","pages":"104746"},"PeriodicalIF":2.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142903147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Cuticular nitrogen economy during development in the cockroach Cryptocercus punctulatus and the termite Neotermes jouteli. 斑点隐尾虫和白蚁发育过程中表皮氮经济性的研究。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2024-12-25 DOI: 10.1016/j.jinsphys.2024.104745

D E Mullins, C A Nalepa, A J Mullins, S E Gabbert

{"title":"Cuticular nitrogen economy during development in the cockroach Cryptocercus punctulatus and the termite Neotermes jouteli.","authors":"D E Mullins, C A Nalepa, A J Mullins, S E Gabbert","doi":"10.1016/j.jinsphys.2024.104745","DOIUrl":"10.1016/j.jinsphys.2024.104745","url":null,"abstract":"<p><p>The role of nitrogen during insect development and reproduction is key in the success of a species, and is of primary importance in wood feeding taxa. Based on comparison of xylophagous, one-piece termites to the termite sister group, subsocial wood-feeding cockroaches in the genus Cryptocercus, it has been proposed that the evolution of termite eusociality involved a fundamental shift in nitrogen allocation strategies. Cryptocercus exhibits a nitrogen storage economy, with individuals gradually increasing in size and cuticular density over a years-long developmental period. Termites, however, remain in a juvenilized morphotype with minimal investment into cuticle, suggesting that nitrogen is conserved and circulated according to the needs of the colony via behaviors such as trophallaxis and cannibalism. We examined the nitrogen economy of Cryptocercus punctulatus and the dampwood termite Neotermes jouteli, focusing on cuticular nitrogen investment during development and exuvial nitrogen losses resulting from molting. Cryptocercus progressively changes from a pale, thin, soft cuticle at hatch to a dark, thick, heavily sclerotized cuticle in adults; increases in N/mg cuticle and the quantity of cuticular catecholamines are correlated with these ontogenetic color changes. There were significant differences in the nitrogen content of two successive age classes of early stage juveniles and in their discarded exuvia at molt. Soldier and alate castes of N. jouteli exhibited the highest sclerotization/melanization indices; pseudergates had levels comparable to those measured in Class I (3rd and 4th instar) juveniles of C. punctulatus. Exuvia of N. jouteli contained 0.19 μgN/mg, while exuvia of approximately two- and three-year-old C. punctulatus had 72.9 and 82.6 μgN/mg, respectively. Our data support the hypothesis that the evolution of termite eusociality from subsocial cockroach ancestors was rooted in chronic fitness limitations imposed by their low nitrogen diet.</p>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":" ","pages":"104745"},"PeriodicalIF":2.3,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142895317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A potential role for the interaction of Wolbachia surface proteins with the Drosophila microtubulin in maintenance of endosymbiosis and affecting spermiogenesis. 沃尔巴克氏体表面蛋白与果蝇微管蛋白相互作用在维持内共生和影响精子发生中的潜在作用。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2024-12-19 DOI: 10.1016/j.jinsphys.2024.104743

Bin Mao, Ying-Ying Wang, Si-Ying Li, Yue Fu, Yun-Li Xiao, Yu-Feng Wang

{"title":"A potential role for the interaction of Wolbachia surface proteins with the Drosophila microtubulin in maintenance of endosymbiosis and affecting spermiogenesis.","authors":"Bin Mao, Ying-Ying Wang, Si-Ying Li, Yue Fu, Yun-Li Xiao, Yu-Feng Wang","doi":"10.1016/j.jinsphys.2024.104743","DOIUrl":"10.1016/j.jinsphys.2024.104743","url":null,"abstract":"<p><p>Wolbachia, as a widely infected intracellular symbiotic bacterium in Arthropoda, is able to manipulate the reproduction of insect hosts for facilitating their own transmission. Cytoplasmic incompatibility (CI) is the most common phenotype that Wolbachia induced in insect hosts where they resulted in the failure of uninfected egg hatch when fertilized with the sperm derived from Wolbachia-infected males, suggesting that the sperm are modified by Wolbachia during spermatogenesis. Although the molecular mechanisms of CI are beginning to be understood, the effects of Wolbachia on the symbiotic relationship and the proper dynamics of spermatogenesis have not yet been fully investigated. We report here that Wolbachia infection induced a significant upregulation of betaTub85D in the testis of Drosophila melanogaster. Knockdown of betaTub85D in fly testes resulted in significant decrease in the copy number of Wolbachia surface protein gene (wsp), indicating a notable reduction of Wolbachia density. Pull-down analyses revealed that WSP interacted with the betaTub85D of D. melanogaster. Wolbachia infection altered the interactome between betaTub85D and other proteins in the testes, and may thus change the protein synthesis and metabolic pathways. Wolbachia infection induced not only an interaction of betaTub85D with Mst77F but also increase in phosphorylated Mst77F. These results suggest that Wolbachia WSP protein might play important roles in anchoring the endosymbiont to the host's cytoskeleton and consequently interfere the interactions among key proteins involved in spermatogenesis in the insect host testes, resulting in modified sperm.</p>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":" ","pages":"104743"},"PeriodicalIF":2.3,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Improving parasitism success of a weakly virulent parasitoid strain. 提高弱毒寄生性菌株的寄生成功率。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2024-12-15 DOI: 10.1016/j.jinsphys.2024.104742

Samuel Gornard, Pascaline Venon, Salimata Drabo, Laure Kaiser, Florence Mougel

{"title":"Improving parasitism success of a weakly virulent parasitoid strain.","authors":"Samuel Gornard, Pascaline Venon, Salimata Drabo, Laure Kaiser, Florence Mougel","doi":"10.1016/j.jinsphys.2024.104742","DOIUrl":"10.1016/j.jinsphys.2024.104742","url":null,"abstract":"<p><p>Endoparasitoids possess a whole set of virulence factors to counter the immune response of their host, among which can be found venom, endosymbiotic viruses and ovarian proteins. Depending on the species, some factors are expected to be less necessary than others. Notably, venom is reported as inessential in some parasitoids bearing viruses. We investigated the virulence factors of Cotesia typhae, a gregarious endoparasitoid of Sesamia nonagrioides, using highly and poorly virulent strains (CtV+ and CtV-). We tested if virulence of CtV- toward a reference strain could be improved by superparasitism (two females per host) or by injection of CtV+ virulence factors (venom and/or ovarian fluid). The parasitism success of CtV- could be increased by superparasitism with one female CtV+ confirming the importance of the virulence factors. Superparasitism with at least one CtV+ female decreased each female's reproductive success and increased the number of non-viable offspring revealing larval competition. Parasitism order impacted the offspring proportion of each strain in the progeny, suggesting adaptation of egg-laying behavior in response to an already parasitized host. Injection of CtV+ venom or ovarian fluid alone maintained CtV- success unchanged, but their combination increased it to the one of CtV+. Altogether, this study hints towards larval competition, potentially specific to CtV+ strain, and suggests that C. typhae females can adapt their oviposition behavior based on the parasitic status of their host. It also demonstrates that, like several other Cotesia species, C. typhae resorts to a combination of venom and ovarian fluid to overcome the host's immune responses.</p>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":" ","pages":"104742"},"PeriodicalIF":2.3,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142837229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Adult brain neurogenesis does not account for behavioral differences between solitary and social bees. 成年的脑神经发生不能解释独居蜜蜂和群居蜜蜂之间的行为差异。

IF 2.3 2区农林科学

Journal of insect physiology Pub Date : 2024-12-12 DOI: 10.1016/j.jinsphys.2024.104737

Iulia Antioch, Sarah Larnaudie, Isabelle Lafon, Jean-Marc Devaud, Claire Rampon, Raphaël Jeanson

{"title":"Adult brain neurogenesis does not account for behavioral differences between solitary and social bees.","authors":"Iulia Antioch, Sarah Larnaudie, Isabelle Lafon, Jean-Marc Devaud, Claire Rampon, Raphaël Jeanson","doi":"10.1016/j.jinsphys.2024.104737","DOIUrl":"10.1016/j.jinsphys.2024.104737","url":null,"abstract":"<p><p>In many taxa, increasing attention is being paid to how group living shapes the expression of brain plasticity and behavioural flexibility. In eusocial insects, the lifelong commitment of workers and queens to a reproductive or non-reproductive caste is accompanied by a loss of behavioural totipotency, and often, by the expression of a limited behavioural repertoire in workers due to their specialisation. On the other hand, individuals of solitary species have a broader behavioural repertoire as they have to perform all the tasks themselves. This raises the question of whether solitary and social insects differ in their levels of brain plasticity. One mechanism found in both invertebrates and vertebrates to contribute to brain plasticity is adult neurogenesis. It is a mechanism by which adult-born neurons are generated, differentiated and functionally integrated in the brain circuits during adulthood. In this study, we compared the solitary bee Osmia bicornis and the eusocial bee Apis mellifera. We focused on the mushroom bodies which are higher-order integration centres in the insect brain. Based on their known behavioural repertoire, our prediction was that both solitary and social bees would exhibit neurogenesis in the brain until the pupal stage, but that this capacity would persist only in adult solitary bees. However, our results do not validate this prediction, as they indicate that no cells are produced in the mushroom bodies or other areas of the adult solitary bee brain.</p>","PeriodicalId":16189,"journal":{"name":"Journal of insect physiology","volume":" ","pages":"104737"},"PeriodicalIF":2.3,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142822115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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