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Long-term spatial memory in Vespula germanica social wasps： the influence of past experience on foraging behavior

Insect Science 2017年第5期24卷 853-858页

作者： Sabrina Moreyra Paola D'Adamo Mariana Lozada Laboratory Ecotono INIBIOMA CONICET Universidad Nacional de/Comahue Quintral 1250 (8400) Bariloche Argentina

social insects exhibit complex learning and memory mechanisms while for- aging. Vespula germanica （Fab.）（Hymenoptera： Vespidae） is an invasive social wasp that frequently forages on undepleted food sources, making several flights between the resource and the nest. Previous studies have shown that during this relocating behavior, wasps learn to associate food with a certain site, and can recall this association 1 h later. In this work, we evaluated whether this wasp species is capable of retrieving an established association after 24 h. For this purpose, we trained free flying individuals to collect proteinaceous food from an experimental plate （feeder） located in an experimental array. A total of 150 individuals were allowed 2, 4, or 8 visits. After the training phase, the array was re- moved and set up again 24 h later, but this time a second baited plate was placed opposite to the first. After 24 h we recorded the rate of wasps that returned to the experimental area and those which collected food from the previously learned feeding station or the nonlearned one. During the testing phase, we observed that a low rate of wasps trained with 2 collecting visits returned to the experimental area （22%）, whereas the rate of returning wasps trained with 4 or 8 collecting visits was higher （51% and 41%, respectively）. Moreover, wasps trained with 8 feeding visits collected food from the previously learned feeding station at a higher rate than those that did from the nonlearned one. In contrast, wasps trained 2 or 4 times chose both feeding stations at a similar rate. Thus, significantly more wasps returned to the previously learned feeding station after 8 repeated foraging flights but not after only 2 or 4 visits. This is the first report that demonstrates the existence of long-term spatial memory in V. germanica wasps.

关键词： foraging behavior learning long-term memory relocating behavior social wasps

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Sex recognition does not modulate aggression toward nest intruders in a paper wasp

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Current Zoology 2023年第3期69卷 324-331页

作者： Andre Rodrigues de Souza Wilson Franca Amanda Prato Fabio Santos do Nascimento Departamento de Biologia Faculdade de Filosofia Ciencias e Letras de Ribeirao PretoUniversidade de Sao PauloSao PauloBrazil

During social interactions,the behavior of an individual often depends on the sex of its social partner.Many animal societies have males and females that play very different behavioral roles,although they coexist and interact non-sexually.At specific phases of the colony cycle,social wasp females and males are contemporaries within a nest,they often interact,although mating occurs mostly off the nest,therefore providing an opportunity to test sex discrimination in contexts other than classical sexual ones.We performed a lure presentation experiment to test if Mischocyttarus metathoracicus discriminate between conspecifics of the 2 sexes during on-nest social interactions.Female wasps discriminated conspecific sex during experimentally simulated nest intrusions.Visual and chemical cues may account for this sex discrimination.Despite sex discrimination(evidenced by differential inspective behavior from the nest females toward the female and the male lures),female wasps were as aggressive toward lures of both sexes.In the female-dominated hymenopteran societies,males are often subordinate and not aggressive on nest,resulting in females directing less aggression to them compared to other females.Instead,M.metathoracicus males and females are both aggressive toward nestmates,so they might be perceived as similar threat during on-nest social interactions.

关键词： chemical cues Mischocyttarus sex discrimination social interactions social wasps visual cues

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How behavioral plasticity enables foraging under changing environmental conditions in the social wasp Vespula germanica (Hymenoptera: Vespidae)

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Insect Science 2021年第1期28卷 231-237页

作者： Sabrina Moreyra Mariana Lozada Laboratorio Ecotono.Instituto de Investigaciones en Biodiversidad y Medio Ambiente(INIBIOMA)—CONICET—Universidad Nacional del Comahue QuintralBarilocheArgentina

The foraging strategy at abundant resources of the social wasp Vespula germanica includes scanning in the direction of the nest while memorizing resource-specific landmarks and contextual cues.In the present study,we sought to explore wasps'behavioral plasticity on foraging trips to resources whose location and composition changed after a single visit.We evaluated how contextual modifications of food displacement and replacements 60 cm apart from the original site,affect re-orientation for re-finding previously memorized food resources.The results showed that wasps detected and collected the resource faster when more changes were introduced on the following visit.If returning foragers discovered several modifications on both the location and the kind of resource,they collected food more rapidly from the displaced dish,than if only a single parameter in the environment had been changed.These findings illustrate the grade of behavioral plasticity in V.germanica while foraging on abundant resources,which may contribute to the understanding of the prodigious invasive success of this species in anthropized environments.

关键词： behavioral plasticity environmental conditions foraging invasive insects learning social wasps

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Evidence of associative blocking during foraging in the social wasp Vespula germanica

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Insect Science 2021年第4期28卷 1103-1108页

作者： Sabrina Moreyra Paola D'Adamo Mariana Lozada Laboratorio Ecotono Instituto de Investigaciones en Biodiversidad y Medio Ambiente(INIBIOMA)-CONICET-Universidad Nacional del Comahue(CRUB)BarilocheArgentina

While foraging,Vespula germanica usually return to abundant food sites.During this relocation behavior,these wasps learn to identify contextual cues associated with food position.We analyzed associative blocking in this species,that is,how an association with a conditioned stimulus(CS1)blocks subsequent learning when a novel stimulus(CS2)is added on a second foraging visit.Three groups of wasps(A,B,and C;total 74 individual wasps)were observed while collecting meat during one or two consecutive visits.In group A,an environmental cue(CS1)was paired with food placed at a specific site,and on the second visit,a second cue(CS2)was added while food remained in the same position.In a subsequent testing phase,CS1 was removed and the food source displaced nearby.We then recorded the number of hovers performed over the empty dish(previously baited).Group A wasps appeared to ignore the addition of CS2 on their second visit because they performed fewer hovers over the learned site.For group A,the duration of the decision-making process to finally fly toward the baited dish was shorter than when CS1 and CS2 were presented together on their first visit(group B).This is the first study to demonstrate the occurrence of associative blocking in vespids,confirming that a prior foraging experience influences subsequent food relocation in V.germanica.Our findings reveal that first learning episodes block further associations with novel contextual cues,contributing to understanding of complex cognitive processes involved in V.germanica´s foraging behavior.

关键词： associative blocking foraging behavior learning prior experience social wasps

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The influence of past experience on wasp choice related to foraging behavior

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Insect Science 2014年第6期21卷 759-764页

作者： Moreyra Sabrina Paola D'Adamo Mariana Lozada Laboratory Ecotono INIBIOMA Quintral 1250 (8400) Bariloche Argentina

Memory has been little studied in social wasps. Vespula germanica （Fab.）（Hymenoptera： Vespidae） frequently revisits nondepleted food sources, making several trips between the resource and the nest. In this study, we analyzed this relocating behavior in order to evaluate whether this species is capable of remembering an established association after 1 h. To this end, we trained wasps to feed from a certain array. Then it was removed, setting it up again 1 h later, but this time 2 baited feeders were put in place, one at the original feeding site and the other opposite the first. We recorded the proportion of returning foragers, and their choice of feeder, after either 1 or 4 feeding trials. After 1 h, 78% of wasps trained with 4 feeding trials and 65% trained with 1, returned to the experimental area. Furthermore, during the testing phase, wasps trained with 4 feeding trials collected food from the previously learned feeder significantly more frequently than from the nonlearned one （P 〈 0.05）. In contrast, wasps that had been trained only once chose both feeders equally. Thus, memory retrieval could be observed 1 h after wasps had collected food on 4 consecutive occasions, but not after only 1. To our knowledge, this is the first study showing that V. germanica is capable of remembering an association 1 h after the last associative event, demonstrating that 1 h does not impair memory retention if4 feeding experiences have occurred.

关键词： cognition foraging behavior learning memory social wasps Vespula germanica

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