scholarly journals Adaptive social immunity in leaf-cutting ants

2009 ◽  
Vol 5 (4) ◽  
pp. 446-448 ◽  
Author(s):  
Tom N. Walker ◽  
William O. H. Hughes

Social insects have evolved a suite of sophisticated defences against parasites. In addition to the individual physiological immune response, social insects also express ‘social immunity’ consisting of group-level defences and behaviours that include allogrooming. Here we investigate whether the social immune response of the leaf-cutting ant Acromyrmex echinatior reacts adaptively to the virulent fungal parasite, Metarhizium anisopliae . We ‘immunized’ mini-nests of the ants by exposing them twice to the parasite and then compared their social immune response with that of naive mini-nests that had not been experimentally exposed to the parasite. Ants allogroomed individuals exposed to the parasite, doing this both for those freshly treated with the parasite, which were infectious but not yet infected, and for those treated 2 days previously, which were already infected but no longer infectious. We found that ants exposed to the parasite received more allogrooming in immunized mini-nests than in naive mini-nests. This increased the survival of the freshly treated ants, but not those that were already infected. The results thus indicate that the social immune response of this leaf-cutting ant is adaptive, with the group exhibiting a greater and more effective response to a parasite that it has previously been exposed to.

2019 ◽  
Vol 13 (2) ◽  
pp. 86-117
Author(s):  
Sainath Suryanarayanan

Abstract This paper excavates the epistemological and ontological foundations of a rapidly emerging field called sociogenomics in relation to the development of social insects as models of social behavior. Its center-stage is “the genome,” where social and environmental information and genetic variation interact to influence social behavior through dynamic shifts in gene expression across multiple bodies and time-scales. With the advent of whole-genome sequencing technology, comparative genomics, and computational tools for mining patterns of association across widely disparate datasets, social insects are being experimented with to identify genetic networks underlying autism, novelty-seeking and aggression evolutionarily shared with humans. Drawing on the writings of key social insect biologists, and historians and philosophers of science, I investigate how the historical development of social insect research on wasps, ants and bees shape central approaches in sociogenomics today, in particular, with regards to shifting understandings of “the individual” in relation to “the social.”


2014 ◽  
Vol 14 (5) ◽  
pp. 345-355 ◽  
Author(s):  
Ronald Fischer ◽  
Dimitris Xygalatas

We often think of pain as intrinsically bad, and the avoidance of pain is a fundamental evolutionary drive of all species. How can we then explain widespread cultural practices like certain rituals that involve the voluntary infliction of physical pain? In this paper, we argue that inflicting and experiencing pain in a ritual setting may serve important psychological and social functions. By providing psychological relief and leading to stronger identification with the group, such practices may result in a positive feedback loop, which serves both to increase the social cohesion of the community and the continuation of the ritual practices themselves. We argue that although the selective advantage of participation lies at the individual level, the benefits of those practices de facto extend to the group level, thereby allowing extreme rituals to function as effective social technologies.


2018 ◽  
Vol 285 (1890) ◽  
pp. 20181149
Author(s):  
Øistein Haugsten Holen ◽  
Rufus A. Johnstone

Established mimicry theory predicts that Batesian mimics are selected to resemble their defended models, while models are selected to become dissimilar from their mimics. However, this theory has mainly considered individual selection acting on solitary organisms such as adult butterflies. Although Batesian mimicry of social insects is common, the few existing applications of kin selection theory to mimicry have emphasized relatedness among mimics rather than among models. Here, we present a signal detection model of Batesian mimicry in which the population of defended model prey is kin structured. Our analysis shows for most of parameter space that increased average dissimilarity from mimics has a twofold group-level cost for the model prey: it attracts more predators and these adopt more aggressive attack strategies. When mimetic resemblance and local relatedness are sufficiently high, such costs acting in the local neighbourhood may outweigh the individual benefits of dissimilarity, causing kin selection to drive the models to resemble their mimics. This requires model prey to be more common than mimics and/or well-defended, the conditions under which Batesian mimicry is thought most successful. Local relatedness makes defended prey easier targets for Batesian mimicry and is likely to stabilize the mimetic relationship over time.


2021 ◽  
Author(s):  
Alecia Carter ◽  
Guy Cowlishaw

The formation of culture in animal societies, including humans, relies on the social transmission of information amongst individuals. This spread depends upon the transmission of social information, or social learning, between individuals. However, not all information spreads. To better understand how constraints at the individual-, dyad- and group-level might influence the formation of culture, we experimentally introduced four innovations (novel behaviours) across three troops of wild chacma baboons (Papio ursinus). At the individual-level, different phenotypic traits constrained individuals' use of social information about the innovations. At the dyad-level, we found evidence for social reinforcement and directed social learning affecting who learnt and from whom. Group-level characteristics also limited the diffusion of information, which spread more slowly through social networks that showed less mixing across age classes. Nevertheless, despite these multi-level limitations, the four innovations quickly spread through all the social groups in which they were tested, suggesting that the formation of animal cultures can be surprisingly resilient to constraints on information transmission.


2021 ◽  
Vol 376 (1823) ◽  
pp. 20190735 ◽  
Author(s):  
Megha Majoe ◽  
Romain Libbrecht ◽  
Susanne Foitzik ◽  
Volker Nehring

Longevity is traded off with fecundity in most solitary species, but the two traits are positively linked in social insects. In ants, the most fecund individuals (queens and kings) live longer than the non-reproductive individuals, the workers. In many species, workers may become fertile following queen loss, and recent evidence suggests that worker fecundity extends worker lifespan. We postulated that this effect is in part owing to improved resilience to oxidative stress, and tested this hypothesis in three Myrmicine ants: Temnothorax rugatulus, and the leaf-cutting ants Atta colombica and Acromyrmex echinatior . We removed the queen from colonies to induce worker reproduction and subjected workers to oxidative stress. Oxidative stress drastically reduced survival, but this effect was less pronounced in leaf-cutting ant workers from queenless nests. We also found that, irrespective of oxidative stress, outside workers died earlier than inside workers did, likely because they were older. Since At. colombica workers cannot produce fertile offspring, our results indicate that direct reproduction is not necessary to extend the lives of queenless workers. Our findings suggest that workers are less resilient to oxidative stress in the presence of the queen, and raise questions on the proximate and ultimate mechanisms underlying socially mediated variation in worker lifespan. This article is part of the theme issue ‘Ageing and sociality: why, when and how does sociality change ageing patterns?’


1999 ◽  
Vol 58 (3) ◽  
pp. 201-206 ◽  
Author(s):  
Claude Flament

This paper is concerned by a possible articulation between the diversity of individual opinions and the existence of consensus in social representations. It postulates the existence of consensual normative boundaries framing the individual opinions. A study by questionnaire about the social representations of the development of intelligence gives support to this notion.


2013 ◽  
Vol 5 (1) ◽  
pp. 131-137
Author(s):  
Roxanne Christensen ◽  
LaSonia Barlow ◽  
Demetrius E. Ford

Three personal reflections provided by doctoral students of the Michigan School of Professional Psychology (Farmington Hills, Michigan) address identification of individual perspectives on the tragic events surrounding Trayvon Martin’s death. The historical ramifications of a culture-in-context and the way civil rights, racism, and community traumatization play a role in the social construction of criminals are explored. A justice orientation is applied to both the community and the individual via internal reflection about the unique individual and collective roles social justice plays in the outcome of these events. Finally, the personal and professional responses of a practitioner who is also a mother of minority young men brings to light the need to educate against stereotypes, assist a community to heal, and simultaneously manage the direct effects of such events on youth in society. In all three essays, common themes of community and growth are addressed from varying viewpoints. As worlds collided, a historical division has given rise to a present unity geared toward breaking the cycle of violence and trauma. The authors plead that if there is no other service in the name of this tragedy, let it at least contribute to the actualization of a society toward growth and healing.


This volume provides the first comprehensive overview of the extant Greek and Latin letter collections of late antiquity (ca. 300-600 C.E.). Bringing together an international team of historians, classicists, and scholars of religion, it illustrates how letter collections advertised an image of the letter writer and introduces the social and textual histories of each collection. Nearly every chapter focuses on the letter collection of a different late ancient author—from the famous (or even infamous) to the obscure—and investigates its particular issues of content, arrangement, and publication context. On the whole, the volume reveals how late antique letter collections operated as a discrete literary genre with its own conventions, transmission processes, and self-presentational agendas while offering new approaches to interpret both larger letter collections and the individual letters contained within them. Each chapter contributes to a broad argument that scholars should read letter collections as they do representatives of other late antique literary genres, as single texts made up of individual components, with larger thematic and literary characteristics that are as important as those of their component parts.


1970 ◽  
Vol 8 (1) ◽  
pp. 221-226
Author(s):  
Олена Горова

Професійне   становлення   особистості   супроводжує   всі   етапи  соціально-вікового   розвитку  особистості.  Трудова  діяльність  є  основним  видом  суспільної  активності,  який  дозволяє  працівнику  задовольняти  основні  потреби,  особливо  у  процесі  постійних  соціальних,  освітніх  реформ.  Важливим  завданням психологічного супроводу працівника у процесі виконання професійної діяльності є забезпечення  сприятливих  умов  формування  професійно  важливих  якостей.  Соціальна  успішність  є  результатом  ефективного  розв’язання  виробничих  завдань, які  мають  суспільно корисну  важливість  та  пов’язані  з  потребами інших людей. Якісний прогресивний розвиток працівника можливий лише за умови збереження  стійкого  позитивного  ставлення  до  професії.  Позитивна  професійна  самоідентифікація  пов’язана  з  ототожненням  та  персоналізацією  працівником  особистісних  рис  працівників,  які  досягли  успіху  у  професії,  мають  суспільно  визнані  результати  діяльності.  Таким  чином,  професійна  успішність  як  суб’єктне  новоутворення  у  якості  відчуття  гордості  за  власні  результати  діяльності  забезпечує  реалізацію традиції наставництва і  передачі позитивного професійного досвіду.    Професійно  успішний  працівник  усвідомлює  необхідність  та  важливість  результатів  своєї  діяльності  для  інших,  що  вимагає,  відповідно,  від  соціального  середовища  усвідомлення  необхідності  визнання  результатів  діяльності  фахівців.  Знехтуваний  суспільством  працівник,  або  той,  результати  діяльності  якого  позиціонуються  як  меншовартісні,  дистанціюється  від  професії  та  має  негативний  потенціал розвитку. Professional formation of the person accompanies all phases of social and age of the individual. Gainful  employment is the main form of social activity that allows the employee to realize the basic needs. An important task  of psychological support worker in the course of professional activity is to provide favorable conditions for the  formation  of  professionally  important  qualities.  Professional  success  is  the  result  of  an  effective  solution  of  industrial jobs that are socially useful and important related to the needs of others. High-quality progressive  development of an employee is only possible while maintaining a stable positive attitude towards the profession.  Positive  professional  identity  associated  with  the  identification  and  personalization  of  employee  personality traits of employees who have been successful in the profession, who have publicly acknowledged  performance. Thus professional success as the subjective feeling of a lump in the pride of their own results of  operations  ensures  the  implementation  of  the  tradition  of  mentoring  and  of  positive  transfer  of  professional  experience.  Professionally successful employees aware of the need and the importance of the results of its operations  for the other, which requires, respectively, from the social environment - awareness of the need to recognize the  performance of specialists. Unclaimed society worker, or the results of operations, which are positioned as less  important, is moving away from the profession and has a negative potential. 


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