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Gustatory responsiveness in Vespula germanica workers:exploring the interplay between sensory perception and task specialization

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Insect Science 2024年第2期31卷 587-598页

作者： Analia Mattiacci Carolina Mengoni Gonalons MaitéMasciocchi Juan C.Corley grupo de ecologia de poblaciones de insectos IFAB(CONICETINTA EEA Bariloche)BarilocheArgentina departamento de ecologia Centro Regional Universitario BarilocheUniversidad Nacional Del ComahueBarilocheArgentina departamento de Biodiversidad y Biologia Experimental Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresBuenos AiresArgentina

Workers'task specialization and division of labor are critical features of social insects'ecological success.It has been proposed that the division of labor relies on response threshold models:individuals varying their sensitivity(and responsiveness)to biologically relevant stimuli and performing a specific task when a stimulus exceeds an internal threshold.In this work,we study carbohydrate and protein responsiveness and their relation to worker task specialization in Vespula germanica,an invasive social wasp.The sucrose and peptone responsiveness of two different subcastes,preforagers and foragers,was determined by stimulating the antenna of the wasps with increasing concentrations of the solution and quantifying whether each concentration elicited a licking response.We studied responsiveness in five different ways:(1)response threshold,(2)concentration 50(concentration to which at least 50%of wasps responded),(3)maximum response,(4)mean scores and(5)median scores.Our results suggest that V germanica foragers are more sensitive to sucrose(lower thresholds)than preforager workers.However,we found no differences for peptone thresholds(i.e.,a protein resource).Nonetheless,this is the first study to investigate response thresholds for protein resources.The intercaste variation in sucrose responsiveness shown in our work contributes to the existing knowledge about response threshold theory as a mechanism for task specialization observed in V germanica.

关键词： carbohydrates responsiveness division of labor protein responsiveness response thresholds models social insect yellow jacket

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Current Zoology 2024年第1期70卷 1-12页

作者： Lucia V.Sommaro Juan J.Martinez Marina B.Chiappero Andrea R.Steinmann Cristina N.Gardenal JoséW.Priotto Laboratorio de ecologia Evolutiva y Biogeografia Instituto de Ecorregiones Andinas(INECoA)Universidad Nacional de Jujuy-Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)San Salvador de JujuyJujuyArgentina Instituto de Diversidad y ecologia Animal(IdeA) Consejo Nacional de Investigaciones Cientificas y Técnicas(CONICET)and Universidad Nacionalde CordobaCordobaArgentina Catedra de Genética de poblaciones y Evolucion Facultad de Ciencias ExactasFisicas y NaturalesUniversidad Nacional de CordobaCordobaArgentina grupo de Investigaciones en ecologia Poblacional y Comportamental(GIEPCO) Instituto de Ciencias de la TierraBiodiversidad y Ambiente(ICBiA)Universidad Nacional de Rio Cuarto-Consejo Nacional de Investigaciones Cientificas y Técnicas(CONICET)Rio CuartoCordobaArgentina

The sex-biased dispersal and kinship dynamics are important factors shaping the spatial distribution of individuals and are key parameters affecting a variety of ecological and evolutionary processes.Here,we studied the spatial distribution of related individuals within a population of corn mice Calomys musculinus in a seasonal cycle to infer dispersal patterns.The sampling was carried out from spring 2005 to winter 2006 in field borders of intensively managed agroecosystems.Genotyping data from 346 individuals with 9 microsatellites showed spatial genetic structure was weak for males,but not for females.The results indicate a complex spatial kinship dynamic of related females across all seasons.Which,contrary to our expectations,dispersal distances decrease with the increase of the population abundance.Meanwhile,male dispersal distances were greater when population abundance increased and thus the availability of active females.Males disperse greater distances to mate and sire offspring with distant females as a possible inbreeding avoidance mechanism.This study shows that C.musculinus is capable of much greater scattering distances than previously reported and that dispersal occurs fluidly and without barriers across the agroecosystem.The indirect benefit of dispersal on individual fitness could be related to relaxing the competition in the natal area and increasing the mating rate.Our study highlights the value of combining genetic relatedness,fieldwork observations,and behavioral data to estimate dispersal at a fine geographical scale.

关键词： dispersal distances kinship dynamics microsatellite small mammals spatial autocorrelation

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Flexible foraging decisions made by workers of the social wasp Vespula germanica (Hymenoptera: Vespidae) in response to different resources: influence of ontogenetic shifts and colony feedback

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Insect Science 2022年第2期29卷 581-594页

作者： Analía Mattiacci MaitéMasciocchi Juan C.Corley grupo de Ecología de poblaciones de insectos IFAB(CONICETINTA EEA Bariloche)BarilocheArgentina departamento de Ecología Centro Regional Universitario BarilocheUniversidad Nacional Del ComahueBarilocheArgentina

decisions made by foraging animals conform a complex process based on the integration of information from multiple external environmental stimuli and internal physiological signals,which in turn are modulated by individual experience and a detection threshold of each individual.For social insects in which foraging is limited to given age subcastes,individual foraging decisions may also be affected by ontogenetic shifts and colony requirements.We studied the short-term changes in foraging preferences of the generalist wasp Vespula germanica,focusing on whether the individual response to different resources could be influenced by the ontogenetic shifts and/or by social interaction with nestmates.We carried both laboratory and field experiments to confront worker wasps to a short-term resource switch between either protein or carbohydrate-based foods.We tested the response of(1)Preforager workers(no foraging experience nor interaction with other wasps),(2)Forager workers(experience in foraging and no colony feedback),and(3)Wild forager workers(foraging naturally and exposed to free interactions with nestmates).We evaluated the maxilla-labium extension response(MaLER)for laboratory assays or the landing response for field assays.We observed that for wasps deprived of colony feedback(either preforagers or foragers),the protein-rich foods acceptance threshold increased(and thus a lower level of foraging on that item was observed)if they had foraged on carbohydrates previously,whereas carbohydrates were accepted in all assays.However,wasps immersed in a natural foraging context did accept protein foods regardless of their first foraging experience and reduced the carbohydrates collected when trained on protein foods.We provide evidence that short-term changes in foraging preferences depend on the type of resource foraged and on the social interactions,but not on ontogenetic shifts.

关键词： German wasp invasive species plastic insect behavior response thresholds modulation social insect yellowjackets

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Dispersal behavior of yellowjacket （Vespula germanica） queens

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Insect Science 2018年第1期25卷 109-116页

作者： Maite Masciocchi Andres S. Martinez Aria J. Pereira Jose M. Villacide Juan C. Corley CONICET CCT Comahue INTA Grupo de Ecologia de Poblaciones de Insectos INTA EEA Bariloche Argentina Centro Regional Universitario Bariloche U. N. del Comahue Bariloche 8400 Argentina

Understanding the factors that affect animal dispersal behavior is important from both fi.mdamental and applied perspectives. Dispersal can have clear evolutionary and ecological consequences, but for normative insect pests, dispersal capacity can also help to explain invasion success. Vespula germanica is a social wasp that, in the last century, has successfully invaded several regions of the world, showing one of the highest spread rates reported for a nonnative insect. In contrast with nonsocial wasps, in social species, queens are responsible for population redistribution and spread, as workers are sterile. For V. germanica, it has been observed that queen flight is limited to 2 distinct periods： early autumn, when new queens leave the nest to mate and find sheltered places in which to hibernate, and spring when new colonies are founded. Our aim was to study the flight behavior of V. germanica queens by focusing on the different periods in which dispersal occurs, characterizing as well the potential contribution of queen flight （i.e., distance） to the observed geographical spread. Our results suggest that the distances flown by nonover- wintered queens is greater than that flown by overwintered individuals, suggesting that the main queen dispersal events would occur before queens enter hibernation. This could relate to a behavioral trait of the queens to avoid the inbreeding with related drones. Additionally, given the short distances flown and remarkable geographical spread observed, we provide evidence showing that queen dispersal by flight is likely to contribute proportionately less to population spread than human-aided factors.

关键词： flight potential German wasps hibernation invasive wasps social insect

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The Genome of Cucurbita argyrosperma (Silver- Seed Gourd) Reveals Faster Rates of Protein- Coding Gene and Long Noncoding RNA Turnover and Neofunctionalization within Cucurbita

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Molecular Plant 2019年第4期12卷 506-520页

作者： Josue Barrera-Red on do Enrique Ibarra-Laclette Alejandra Vazquez-Lobo Yocelyn T. Gutierrez-Guerrero Guillermo Sanchez de la Vega Daniel Pinero Salvador Montes-Hernandez Rafael Lira-Saade Luis E. Eguiarte departamento de ecologia Evolutiva Instituto de Ecologia Universidad Nacional Aut6noma de Mexico Circuito Exterior s/n Anexo al Jardin Bot合nico 04510 Ciudad de Mexico Mexico departamento de Estudios Moleculares Avanzados Instituto de Ecologia A.C. Carretera Antigua a Coatepec No. 351 Col. El Haya. C.P. Xalapa Veracruz 91070 Mexico Centro de Investigaciones en Biodiversidad y Conservacion Universidad Autdnoma del Estado de Morelos Av. Universidad 1001 Col. Chamilpa Cuernavaca Morelos 62209 Mexico Campo Experimental Bajio Instituto Nacional de In vestigaciones Forestales Agricolas y Pecuarias (INIFAP) Km 6.5 Carretera Celaya-San Miguel de Allen de Celaya Guanajuato 38110 Mexico UBIPRO Facultad de Estudios Superiores Iztacala Universidad Nacional Autdnoma de Mexico Av. de los Barrios #1 Col. Los Reyes Iztacala Tlanepantla Edo. de Mex 54090 Mexico

Whole-genome duplications are an important source of evolutionary novelties that change the mode and tempo at which genetic elements evolve within a genome. The Cucurbita genus experienced a wholegenome duplication around 30 million years ago, although the evolutionary dynamics of the coding and noncoding genes in this genus have not yet been scrutinized. Here, we analyzed the genomes of four Cucurbita species, in eluding a newly assembled genome of Cucurbita argyrosperma, and compared the gene con tents of these species with those of five other members of the Cucurbitaceae family to assess the evolutionary dynamics of protein-coding and long intergenic noncoding RNA (lincRNA) genes after the genome duplication. We report that Cucurbita genomes have a higher protein-coding gene birth-death rate compared with the genomes of the other members of the Cucurbitaceae family. C. argyrosperma gene families associated with pollination and transmembrane transport had significantly faster evolutionary rates. lincRNA families showed high levels of gene turnover throughout the phylogeny, and 67.7% of the lincRNA families in Cucurbita showed evidence of birth from the neofunctionalization of previously existing protein-coding genes. Collectively, our results suggest that the whole-genome duplication in Cucurbita resulted in faster rates of gene family evolution through the neofunctionalization of duplicated genes.

关键词： Cucurbita argyrosperma, comparative genomics molecular evolution neofunctionalization long noncoding RNA whole-genome duplication

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