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Understanding the relationship between physiological factors on social behavior in bees is critical to understanding their ecological dynamics. This study investigates the relationship between body mass, ovary size, Dufour’s gland size, and chill coma recovery time in female Xylocopa tabaniformis bees. Analyses reveal a significant predictive relationship between bee body mass and both ovariole length and Dufour’s gland length. Body mass does not emerge as a significant predictor of CCRT, suggesting other factors as better predictors for thermal tolerance. Conflicting conclusions arise regarding CCRT as a function of physical trauma or age, emphasizing a need for further investigation. Future research should expand the scope of species studied, and the timing of the study to include pre-reproductive female bees. The findings of this study provide insight into the physiological underpinnings of bee sociality and highlight the complexity of bee ecological dynamics.This poster was presented at the UCSB URCA colloquium in Spring 2024.

Social animals make behavioural decisions based on local habitat and conspecifics, as well as memorized past experience (i.e. 'familiarity') with habitat and conspecifics. Here, we develop a conceptual and empirical understanding of how spatial and social familiarity fit within the spatial–social interface—a novel framework integrating the spatial and social components of animal behaviour. We conducted a multi-scale analysis of the movements of GPS-collared plains bison (Bison bison, n = 66) residing in and around Yellowstone National Park, USA. We found that both spatial and social familiarity mediate how individuals respond to their spatial and social environments. For instance, individuals with high spatial familiarity rely on their own knowledge as opposed to their conspecifics, and individuals with high social familiarity rely more strongly on the movement of conspecifics to guide their own movement. We also found that fine-scale spatial and social phenotypes often scale up to broad-scale phenotypes. For instance, bison that select more strongly to align with their nearest neighbour have larger home ranges. By integrating spatial and social familiarity into the spatial–social interface, we demonstrate the utility of the interface for testing hypotheses, while also highlighting the pervasive importance of cognitive mechanisms in animal behaviour. This article is part of the theme issue 'The spatial–social interface: a theoretical and empirical integration'. [ABSTRACT FROM AUTHOR]

Site fidelity—the tendency to reuse familiar spaces—is expected to improve fitness. Familiarity with the local environment is particularly crucial when resource demands or predation risk are high. Consequently, site fidelity often peaks during reproduction when energetic costs are high and offspring are vulnerable. For many species, the environment they experience is not solely a function of geography but also of the social environment. Social fidelity, the selection for familiar social environments, could constitute an independent or parallel strategy to spatial fidelity when considering behaviour at the spatial–social interface. Using global positioning system locations from caribou across Newfoundland, we tested whether females selected calving sites based on proximity to familiar conspecifics, in addition to geographical (spatial) fidelity. These strategies were synergistic, not alternative, and correlated across the population but more variable within individuals. We also tested whether either form of fidelity affected reproductive success. We failed to detect an effect of spatial or social fidelity on reproductive success in this population. Nevertheless, given the association between social and spatial fidelity and the demonstrated fitness consequences of site fidelity in other systems, familiar conspecifics and the potential benefits these social partners provide may be an underappreciated component driving site fidelity. This article is part of the theme issue 'The spatial–social interface: a theoretical and empirical integration'. [ABSTRACT FROM AUTHOR]

Interactions between density and environmental conditions have important effects on vital rates and consequently on population dynamics and can take complex pathways in species whose demography is strongly influenced by social context, such as the African lion, Panthera leo. In populations of such species, the response of vital rates to density can vary depending on the social structure (e.g. effects of group size or composition).However, studies assessing density dependence in populations of lions and other social species have seldom considered the effects of multiple socially explicit measures of density, and—more particularly for lions—of nomadic males. Additionally, vital‐rate responses to interactions between the environment and various measures of density remain largely uninvestigated.To fill these knowledge gaps, we aimed to understand how a socially and spatially explicit consideration of density (i.e. at the local scale) and its interaction with environmental seasonality affect vital rates of lions in the Serengeti National Park, Tanzania. We used a Bayesian multistate capture–recapture model and Bayesian generalized linear mixed models to estimate lion stage‐specific survival and between‐stage transition rates, as well as reproduction probability and recruitment, while testing for season‐specific effects of density measures at the group and home‐range levels.We found evidence for several such effects. For example, resident‐male survival increased more strongly with coalition size in the dry season compared with the wet season, and adult‐female abundance affected subadult survival negatively in the wet season, but positively in the dry season. Additionally, while our models showed no effect of nomadic males on adult‐female survival, they revealed strong effects of nomads on key processes such as reproduction and takeover dynamics.Therefore, our results highlight the importance of accounting for seasonality and social context when assessing the effects of density on vital rates of Serengeti lions and of social species more generally. [ABSTRACT FROM AUTHOR]

The degree of prey sociality reflects trade-offs between predation risk, and competition for mates and resources. Consequently, the degree of sociality is predicted to differ spatiotemporally. Variations in nychthemeral sociality are, however, understudied. We assessed the activity of solitary, territorial black wildebeest bulls (Connochaetes gnou) over rutting and non-rutting seasons. We predicted that solitary bulls would reduce their nocturnal use of territorial stands and join herds to reduce predation risk from nocturnally hunting lions (Panthera leo), but that these responses would differ across rutting and non-rutting seasons. We used camera trap data and modelled solitary bull and herd activity over 24-hour daily cycles, across rutting and non-rutting seasons. We calculated the proportion of images with solitary bulls and herds across nocturnal and diurnal periods, across both seasons. We show that solitary bulls are predominantly diurnal across both seasons, but the probability of nocturnal detection is higher in the rutting than in the non-rutting season. Furthermore, we recorded a lower proportion of solitary bulls to herds at night in the non-rutting relative to the rutting season. Thus, wildebeest bulls may trade-off predation risk for mate acquisition during the rutting season but reduce risky solitary behaviour during the non-rutting season. [ABSTRACT FROM AUTHOR]

Research on female same-sex relationships has predominantly considered a single partner's perspective on couple satisfaction, and has compared same-sex couples with heterosexual couples. Drawing upon Personal Construct Theory, this study explores how identification, acceptance, commonality and sociality (mutual understanding) between two female same-sex partners are associated with the couple's satisfaction. Forty Italian women involved in same-sex relationships completed the Partnership Questionnaire and 160 repertory grids involving the exchange grid method. A mixed-method analysis was conducted. Higher couple's satisfaction was associated with higher identification with the partner but not with higher commonality and sociality, partner acceptance was associated with higher scores in tenderness. Perceived similarity was higher than commonality and sociality, and partner's acceptance was higher than identification with her. Qualitative analysis heightened the centrality of the participants' experience when compared with the dominant prejudice with regard to homosexuality and the tension between autonomy and fusion. This study revealed the importance of identification and acceptance in terms of couple's satisfaction. [ABSTRACT FROM AUTHOR]

The Social Intelligence Hypothesis (SIH) is one of the leading explanations for the evolution of cognition. Since its inception a vast body of literature investigating the predictions of the SIH has accumulated, using a variety of methodologies and species. However, the generalisability of the hypothesis remains unclear. To gain an understanding of the robustness of the SIH as an explanation for the evolution of cognition, we systematically searched the literature for studies investigating the predictions of the SIH. Accordingly, we compiled 103 studies with 584 effect sizes from 17 taxonomic orders. We present the results of four meta‐analyses which reveal support for the SIH across interspecific, intraspecific and developmental studies. However, effect sizes did not differ significantly between the cognitive or sociality metrics used, taxonomy or testing conditions. Thus, support for the SIH is similar across studies using neuroanatomy and cognitive performance, those using broad categories of sociality, group size and social interactions, across taxonomic groups, and for tests conducted in captivity or the wild. Overall, our meta‐analyses support the SIH as an evolutionary and developmental explanation for cognitive variation. [ABSTRACT FROM AUTHOR]

Rough‐toothed dolphins (Steno bredanensis) typically inhabit deep oceanic waters from tropical to temperate waters worldwide. However, their ecology and behavior remain poorly understood. We investigated site fidelity and social structure of rough‐toothed dolphins using photo‐identification data collected between 2014 and 2022 in the continental shelf waters of the southwestern coast of Mexico. A total of 133 groups of rough‐toothed dolphins were recorded. Mean group size was 4.9 individuals (SD = 4.5), and dolphins were encountered in waters of a mean depth of 110 m (SD = 188). Of 228 individuals identified, 55% were observed once, 39% were seen between two and four times, and 6% were seen five times or more. Site fidelity analysis suggests three levels of site fidelity: transients, occasional visitors, and regular visitors, which are likely to affect the social structure. Through network analysis, nonrandom social patterns were identified (S = 1.25 ± 0.26) and dolphins exhibited both preferences and avoidances of social partners. Cluster analysis suggested significant divisions within the population (Q = 0.43 ± 0.05). Despite limitations related to sample size and design, this preliminary study suggests that rough‐toothed dolphins are best characterized by a fission‐fusion society, which is similar to most coastal delphinid populations. [ABSTRACT FROM AUTHOR]

The prenatal transfer of testosterone (T) from mother to offspring is an important source of phenotypic plasticity. In birds, exposure to ecologically relevant stimuli, such as social competition or an attractive mate, can cause females to deposit more T into their egg yolks. Exposure to elevated yolk T can modify the expression of several fitness‐related traits in offspring (e.g. growth, immune function, secondary sex traits and behaviour). Despite some of these changes being potentially adaptive, not all studies find that yolk T levels change in response to ecologically relevant stimuli. This heterogeneity is currently unexplained, limiting our ability to predict inter‐generational responses to ecological change. Here, we performed a systematic literature search and found 119 observations across 39 wild species that measured inter‐female variation in yolk T allocation in response to various stimuli. We used boosted regression trees, a form of machine learning, to examine whether species‐specific traits or variation in study‐level variables could explain variation in yolk T allocation (i.e. statistically significant vs. non‐significant responses). We found that both species‐specific traits and study‐level variables are important predictors of significant changes in yolk T levels. Geographic range (latitude and longitude), evolutionary distinctiveness, longevity, egg mass relative to female mass, sociality, migration status and time to fledge were among the top 10 most influential predictors of the 48 examined. We also found that studies measuring or manipulating social stimuli (e.g. competition and breeding density) or breeding date were more likely to detect changes in yolk T allocation compared with studies examining other ecological contexts. Overall, these data provide several testable hypotheses concerning yolk T allocation and its adaptive value across species and contexts. Additionally, these findings can help us predict how ecological changes will affect hormonal responses in females that can shape future generations. [ABSTRACT FROM AUTHOR]

Movement is a key component of an animal's life history. While there are numerous factors that influence movement, there is an inherent link between a species' social ecology and its movement ecology. Despite this inherent relationship, the socio‐spatial ecology of many species remains unknown, hampering ecological theory and conservation alike. Here, we use fine‐scale GPS location data and continuous‐time stochastic processes to study the socio‐spatial ecology of 23 giant anteaters (Myrmecophaga tridactyla) in the Brazilian Cerrado. We found that individuals occupied stable home ranges with a mean area of 5.45 km2 with males having significantly larger home ranges than females. The average amount of home‐range overlap was low (0.20, n = 121 dyads), with no evidence that giant anteater home ranges were structured based on territorial, mate‐guarding, or other social behaviour. We also identified a total of 2774 encounter events. Interestingly, both female–male and male–male dyads had significantly more encounters than female–female dyads, with two pronounced seasonal peaks in female–male encounters. Though encounters occurred frequently, associations between dyads were generally weak and there was little evidence of any correlated movement (mean amount of total correlation = 0.01). Collectively, these findings suggest giant anteaters are a solitary and largely asocial species that readily share space with conspecifics. Despite their present capacity to share space, the combined pressures of being condensed into smaller areas and decreased food availability due to increased pesticide use may cause behavioural changes radiating throughout the population. Our study provides insight into heretofore unknown aspects of the socio‐spatial ecology of this iconic, but understudied species, as well as crucial information for proactive area‐based management. Ultimately, these findings contribute towards sustainable development while potentially maintaining the ecological integrity of giant anteaters and their habitats. [ABSTRACT FROM AUTHOR]

Simple Summary: Research has shown that animals that are used to interacting with human beings are better at problem solving. We socialize domestic cats by taking advantage of a sensitive period in their development to make them more amenable to humans so that we can keep them as pets. We studied if this socialization makes the cats better able to solve problems by giving them a puzzle box with a food reward. We studied cats from an animal shelter that used tests to determine incoming cats' socialization. We found that more socialized cats were more likely to solve the puzzle and solve it faster. We can use this information to tell us about cat socialization, cat cognition, and the effects of human exposure on other animals. Domestic cats are capable of leading both solitary and social lives and socializing to humans. This type of socialization may also enhance an animal's problem-solving ability. We examined the relationship between socialization and problem-solving ability, problem-solving speed, and latency to approach a novel apparatus in domestic cats. Socialization towards humans was measured with the Feline Behavior Assessment based on the ASPCA's Feline Spectrum Assessment. This modified measure requires assessors to observe an individual cat's behavior during three steps: observation test, door test, and the stroke and push test. During each test, the assessor examined specific behaviors that are indicative of socialization. Problem solving was assessed with a food-acquisition puzzle box that required the subject to pull on a tab to release a food reward. Twenty-four out of eighty-six cats solved the problem-solving task. More socialized cats were more likely to solve the problem, solve it faster, and approach the apparatus sooner. We also found a significant relationship between age and problem solving; younger adult cats were more likely to solve the problem than older adults. These results provide evidence that domestic cats are not only capable of solving this type of problem but also that their socialization towards humans influences their abilities. [ABSTRACT FROM AUTHOR]

Aggregations and social interactions play an important role in the movement ecology of many animals, including elasmobranchs. Several of these species have shown the capability of carrying out complex social behaviours, and the importance of sociality in this taxon is being realized. Although it is a growing field of study in the case of these organisms, these processes still need to be better understood, especially to support management and conservation policies. In this study, a long-term acoustic telemetry data set collected on Dasyatis pastinaca in a coastal marine protected area was analysed. A co-occurrence network analysis was done to investigate preferential associations among individuals, revealing non-random associations among them. The analysis revealed a few strong and consistent associations that were maintained across inter-migratory periods, as this species performs seasonal migrations to a nearby estuary, suggesting temporal stability of the observed associations. Moreover, individuals had similar average positions and a generally high overlap of space use in both periods, indicating some level of site fidelity to the fully protected area. Groups of up to 64% of tagged individuals were co-detected at a same receiver, particularly in the western side of the array. Despite our limited sample size, likely underestimating associations, these results show that in addition to their large-scale movement pattern, D. pastinaca is likely to also present active partner preference and spatial structure at a finer spatial scale. The nature of such results is relevant to support the protection of these species. [ABSTRACT FROM AUTHOR]

Some hosts harbor more parasites than others. Overdispersion of parasitism suggests that coevolution with parasites may be more important to the biology and ecology of certain species. We examined patterns of parasitism and host traits in fished decapod crustaceans, which are economically and ecologically important worldwide. Using a synthesis approach, we determine that host life history, including habitat, longevity, sociality, invasion history, and fisheries involvement, correlate with the number and type of parasite species harbored. Indicator species analysis revealed close relationships between decapods and certain parasite groups, including crabs with rhizocephalans and dinoflagellates; crayfish with mesomycetozoans, oomycetes, branchiobdellids, and fungi; lobsters with copepods and amoebae; and shrimp with viruses. In contrast, Nematomorpha and Nemertea appear to be under-represented and under-studied as parasite groups in decapods. Decapods that are commercially fished, aquacultured, introduced outside their native range, and/or exhibit parental care tend to have higher parasite species richness (PSR). Parasite richness also increases with how well-studied a host group is, which we addressed with a machine learning algorithm that predicts false negative associations. Geographic range is commonly positively correlated with parasite richness, however reliable ranges are not available for most decapod species, highlighting a significant future research need. Identifying patterns such as these increases our broad understanding of decapod disease ecology but also enabled us to develop a series of recommendations on how to focus future research, management, and aquaculture development efforts. [ABSTRACT FROM AUTHOR]

Studies that concurrently investigate the functional benefits of group living in multiple populations of the same species are rare. Over a 3‐year period (2014–2016), we examined two ecologically contrasting populations to test multiple hypotheses for the adaptive significance of group living in the communally breeding rodent Octodon degus. We quantified the size of social units (number of adults, number of adult females), edible vegetation at burrow systems, and per capita offspring weaned (PCOW) in each population. Contrary to expectations, we did not observe population‐specific associations between group size and edible vegetation or PCOW nor universal benefits of group living. In one population, PCOW increased in mid‐sized groups with more edible vegetation. However, this trend was not consistent across years. Notably, we observed a complete reproductive failure in one population during the first year of study, one that was characterized by low rainfall and no detectable edible vegetation. This result is important because reproductive failure occurred regardless of group size, suggesting that communal living may not buffer degus against the harshest of environmental conditions. Examining how social organization shapes individual reproductive success under extreme variation in food availability is an important step towards understanding how populations will respond to a changing climate. [ABSTRACT FROM AUTHOR]

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Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Studying the mechanisms shaping age-related changes in behavior ("behavioral aging") is important for understanding population dynamics in our changing world. Yet, studies that capture within-individual behavioral changes in wild populations of long-lived animals are still scarce. Here, we used a 15-y GPS-tracking dataset of a social obligate scavenger, the griffon vulture (Gyps fulvus), to investigate age-related changes in movement and social behaviors, and disentangle the role of behavioral plasticity and selective disappearance in shaping such patterns. We tracked 142 individuals for up to 12 y and found a nonlinear increase in site fidelity with age: a sharp increase in site fidelity before sexual maturity (<5 y old), stabilization during adulthood (6 to 15 y), and a further increase at old age (>15 y). This pattern resulted from individuals changing behavior throughout their life (behavioral plasticity) and not from selective disappearance. Mature vultures increased the predictability of their movement routines and spent more nights at the most popular roosting sites compared to younger individuals. Thus, adults likely have a competitive advantage over younger conspecifics. These changes in site fidelity and movement routines were mirrored in changes to social behavior. Older individuals interacted less with their associates (decreasing average strength with age), particularly during the breeding season. Our results reveal a variety of behavioral aging patterns in long-lived species and underscore the importance of behavioral plasticity in shaping such patterns. Comprehensive longitudinal studies are imperative for understanding how plasticity and selection shape the persistence of wild animal populations facing human-induced environmental changes. [ABSTRACT FROM AUTHOR]

The main problem in making sense of Mitsein as an aspect of Dasein in Being and Time concerns the sense in which individual Dasein is an ‘I’, given that it can be either an ‘anyone-self’ or an ‘authentic self’. Though it is clear that the anyone-self relates directly to das Man, the relation of the authentic self to others is debatable. In this paper, I reexamine the relations between self and others by making sense of the referent of each mode of selfhood, with special attention to the problem of explaining the relations between the two. The problem, I claim, can be solved by bringing into relief a certain conception of mereology (theory of parthood relations) that underlies Heidegger’s arguments. As I will demonstrate, Heidegger uses a mereological terminology that appropriates Husserl’s logic of parts and wholes from the Logical Investigations. In view of this, I suggest understanding individual Dasein, both qua anyone-self and qua authentic self, as a moment, i.e. a dependent part of an open-ended whole. The apparent gap between anyone-self and authentic self can be better understood as a shift of focus between two different aspects of being the same type of dependent part of a whole. [ABSTRACT FROM AUTHOR]

Most behavioral traits are known to be weakly heritable, possibly due to their extreme complexity and flexibility. Despite this general pattern, within-species variation in avian colony size choice has been reported to have a strong additive genetic component, but we are aware of no attempts to assess the heritability of avian sociality at the finer spatial scale. Here, we used an animal model and parent–offspring regression to quantify additive genetic variance in social phenotype (local nesting density) in a nonpasserine waterbird, the common tern Sterna hirundo. For this purpose, we used a novel experimental framework, where variation in the social environment was generated by providing birds with artificial patches of attractive nesting substrate that markedly varied in size. During 2011–2019, we collected data on social preferences for either low or high nesting density in over 250 individuals, either kin (mostly parent–offspring relationships) or non-kin recorded breeding multiple times across years. All heritability estimates of local nesting density were low (<0.10), irrespectively of fixed effects (sex and year) included in the models, data used in the modeling (all individuals vs. early recruits), or methodological approach (animal model vs. parent–offspring regression). We conclude that avian sociality, as measured at the local scale, may be much less heritable than colony size choice, as measured at the landscape level. Our study adds to the understanding of additive genetic variance in avian behavior, and it underlines a scale dependency in the heritability of behavioral traits. [ABSTRACT FROM AUTHOR]

Various selection pressures have shaped human uniqueness, for instance, music. When and why did musical universality and diversity emerge? Our hypothesis is that "music" initially originated from manipulative calls with limited musical elements. Thereafter, vocalizations became more complex and flexible along with a greater degree of social learning. Finally, constructed musical instruments and the language faculty resulted in diverse and context‐specific music. Music precursors correspond to vocal communication among nonhuman primates, songbirds, and cetaceans. To place this scenario in hominin history, a three‐phase scheme for music evolution is presented herein. We emphasize (1) the evolution of sociality and life history in australopithecines, (2) the evolution of cognitive and learning abilities in early/middle Homo, and (3) cultural evolution, primarily in Homo sapiens. Human musical capacity and products should be due to the hominin‐specific combination of several biosocial features, including bipedalism, stable pair bonding, alloparenting, expanded brain size, and sexual selection. [ABSTRACT FROM AUTHOR]

Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ageing affects almost all aspects of life and therefore is an important process across societies, human and non-human animal alike. This article introduces new research exploring the complex interplay between individual-level ageing and demography, and the consequences this interplay holds for the structure and functioning of societies across various natural populations. We discuss how this Special Issue provides a foundation for integrating perspectives from evolutionary biology, behavioural ecology and demography to provide new insights into how ageing shapes individuals' social behaviour and social associations, and how this in turn impacts social networks, social processes (such as disease or information transfer) and fitness. Through examining these topics across taxa, from invertebrates to birds and mammals, we outline how contemporary studies are using natural populations to advance our understanding of the relationship between age and society in innovative ways. We highlight key emerging research themes from this Special Issue, such as how sociality affects lifespan and health, the genetic and ecological underpinnings of social ageing and the adaptive strategies employed by different species. We conclude that this Special Issue underscores the importance of studying social ageing using diverse systems and interdisciplinary approaches for advancing evolutionary and ecological insights into both ageing and sociality more generally. This article is part of the discussion meeting issue 'Understanding age and society using natural populations '. [ABSTRACT FROM AUTHOR]

The age of individuals has consequences not only for their fitness and behaviour but also for the functioning of the groups they form. Because social behaviour often changes with age, population age structure is expected to shape the social organization, the social environments individuals experience and the operation of social processes within populations. Although research has explored changes in individual social behaviour with age, particularly in controlled settings, there is limited understanding of how age structure governs sociality in wild populations. Here, we synthesize previous research into age-related effects on social processes in natural populations, and discuss the links between age structure, sociality and ecology, specifically focusing on how population age structure might influence social structure and functioning. We highlight the potential for using empirical data from natural populations in combination with social network approaches to uncover pathways linking individual social ageing, population age structure and societal functioning. We discuss the broader implications of these insights for understanding the social impacts of anthropogenic effects on animal population demography and for building a deeper understanding of societal ageing in general. This article is part of the discussion meeting issue 'Understanding age and society using natural populations'. [ABSTRACT FROM AUTHOR]

It is increasingly clear that social environments have profound impacts on the life histories of 'non-social' animals. However, it is not yet well known how species with varying degrees of sociality respond to different social contexts and whether such effects are sex-specific. To survey the extent to which social environments specifically affect lifespan and ageing in non-social species, we performed a systematic literature review, focusing on invertebrates but excluding eusocial insects. We found 80 studies in which lifespan or ageing parameters were measured in relation to changes in same-sex or opposite-sex exposure, group size or cues thereof. Most of the studies focused on manipulations of adults, often reporting sex differences in lifespan following exposure to the opposite sex. Some studies highlighted the impacts of developmental environments or social partner age on lifespan. Several studies explored potential underlying mechanisms, emphasizing that studies on insects could provide excellent opportunities to interrogate the basis of social effects on ageing. We discuss what these studies can tell us about the social environment as a stressor, or trade-offs in resources prompted by different social contexts. We suggest fruitful avenues for further research of social effects across a wider and more diverse range of taxa. This article is part of the discussion meeting issue 'Understanding age and society using natural populations'. [ABSTRACT FROM AUTHOR]

The benefits of social living are well established, but sociality also comes with costs, including infectious disease risk. This cost–benefit ratio of sociality is expected to change across individuals' lifespans, which may drive changes in social behaviour with age. To explore this idea, we combine data from a group-living primate for which social ageing has been described with epidemiological models to show that having lower social connectedness when older can protect against the costs of a hypothetical, directly transmitted endemic pathogen. Assuming no age differences in epidemiological characteristics (susceptibility to, severity and duration of infection), older individuals suffered lower infection costs, which was explained largely because they were less connected in their social networks than younger individuals. This benefit of 'social ageing' depended on epidemiological characteristics and was greatest when infection severity increased with age. When infection duration increased with age, social ageing was beneficial only when pathogen transmissibility was low. Older individuals benefited most from having a lower frequency of interactions (strength) and network embeddedness (closeness) and benefited less from having fewer social partners (degree). Our study provides a first examination of the epidemiology of social ageing, demonstrating the potential for pathogens to influence the evolutionary dynamics of social ageing in natural populations. This article is part of the discussion meeting issue 'Understanding age and society using natural populations'. [ABSTRACT FROM AUTHOR]

Humans become more selective with whom they spend their time, and as a result, the social networks of older humans are smaller than those of younger ones. In non-human animals, processes such as competition and opportunity can result in patterns of declining sociality with age. While there is support for declining sociality with age in mammals, evidence from wild bird populations is lacking. Here, we test whether sociality declines with age in a wild, insular bird population, where we know the exact ages of individuals. Using 6 years of sociality data, we find that as birds aged, their degree and betweenness decreased. The number of same-age birds still alive also decreased with age. Our results suggest that a longitudinal change in sociality with age may be, in part, an emergent effect of natural changes in demography. This highlights the need to investigate the changing costs and benefits of sociality across a lifetime. This article is part of the discussion meeting issue 'Understanding age and society using natural populations'. [ABSTRACT FROM AUTHOR]

Density dependence plays an important role in population regulation in the wild. It involves a decrease in population growth rate when the population size increases. Fifty years ago, Charlesworth introduced the concept of 'critical age group', denoting the age classes in which variation in the number of individuals most strongly contributes to density regulation. Since this pioneering work, this concept has rarely been used. In light of Charlesworth's concept, we discuss the need to develop work between behavioural ecology, demography and evolutionary biology to better understand the mechanisms acting in density-regulated age-structured populations. We highlight demographic studies that explored age-specific contributions to density dependence and discuss the underlying evolutionary processes. Understanding competitive interactions among individuals is pivotal to identify the ages contributing most strongly to density regulation, highlighting the need to move towards behavioural ecology to decipher mechanisms acting in density-regulated age-structured populations. Because individual characteristics other than age can be linked to competitive abilities, expanding the concept of critical age to other structures (e.g. sex, dominance rank) offers interesting perspectives. Linking research fields based on the concept of the critical age group is key to move from a pattern-oriented view of density regulation to a process-oriented approach. This article is part of the discussion meeting issue 'Understanding age and society using natural populations'. [ABSTRACT FROM AUTHOR]

In humans, being more socially integrated is associated with better physical and mental health and/or with lower mortality. This link between sociality and health may have ancient roots: sociality also predicts survival or reproduction in other mammals, such as rats, dolphins, and non‐human primates. A key question, therefore, is which factors influence the degree of sociality over the life course. Longitudinal data can provide valuable insight into how environmental variability drives individual differences in sociality and associated outcomes. The first year of life—when long‐lived mammals are the most reliant on others for nourishment and protection—is likely to play an important role in how individuals learn to integrate into groups. Using behavioral, demographic, and pedigree information on 376 wild capuchin monkeys (Cebus imitator) across 20 years, we address how changes in group composition influence spatial association. We further try to determine the extent to which early maternal social environments have downstream effects on sociality across the juvenile and (sub)adult stages. We find a positive effect of early maternal spatial association, where female infants whose mothers spent more time around others also later spent more time around others as juveniles and subadults. Our results also highlight the importance of kin availability and other aspects of group composition (e.g., group size) in dynamically influencing spatial association across developmental stages. We bring attention to the importance of—and difficulty in—determining the social versus genetic influences that parents have on offspring phenotypes. Research Highlights: Having more maternal kin (mother and siblings) is associated with spending more time near others across developmental stages in both male and female capuchins.Having more offspring as a subadult or adult female is additionally associated with spending more time near others.A mother's average sociality (time near others) is predictive of how social her daughters (but not sons) become as juveniles and subadults (a between‐mother effect).Additional variation within sibling sets in this same maternal phenotype is not predictive of how social they become later relative to each other (no within‐mother effect). [ABSTRACT FROM AUTHOR]

Citizenship appears to us as an incessant constituent process, as a dynamic that is never stabilised, as a continuous development of struggles, conflicts, tensions, relationships, contestations and negotiations between social groups and rulers, between subordinate movements and hegemonic institutions. On this level, we can already understand the city (both conceptually and practically) as a political space that crosses bodies, arranging, placing and dislocating them in a series of interactions and relations that configure sociality and power. It is from these interactions that a process of subjectification (valorisation and qualification) and social de-subjectification is initiated: a process that finds in the urban fabric the prerequisites for political realisation (individual and collective) and for the social recognition of human beings. Beyond the many aspects that accompany this discourse, what we are most interested in emphasising here is the relationship between the idea of citizenship, the exercise of political rights and the cultures of living, which after the state of emergency linked to COVID-19 has redesigned an idea of public health as a form on which to redefine social relations.

Many animals use formalized signals to communicate dominance relationships. In some primates, such as macaques, the function of such signals varies with dominance style. Despotic species produce unidirectional submission signals that have a dual function: in conflict contexts, they signal a willingness to withdraw, whereas in peaceful contexts, they indicate the agreement to subordination. More despotic species produce these calls to a lesser extent than less despotic species. Here, we investigated whether the use of unidirectional submission signals is also related to dominance style in two lemur species and whether signalling subordination stabilizes social relationships at the group level. Ring-tailed lemurs (Lemur catta) exhibit a more despotic dominance hierarchy than Verreaux's sifakas (Propithecus verreauxi). We observed social interactions in 75 dyads of Verreaux's sifakas and 118 dyads of ring-tailed lemurs. Both species used unidirectional submissive calls that have a dual function, potentially suggesting convergent evolution of the function of these signals in independent primate lineages. However, signalling subordination did not stabilize social relationships at the group level in both species. Additionally, subordination occurred more frequently in dyads of the more despotic ring-tailed lemurs than in Verreaux's sifakas, indicating opposite patterns to macaques in the coevolution of social traits with dominance style. This article is part of the theme issue 'The power of sound: unravelling how acoustic communication shapes group dynamics'. [ABSTRACT FROM AUTHOR]

Nonbreeding helpers can greatly improve the survival of young and the reproductive fitness of breeders in many cooperatively breeding species. Breeder turnover, in turn, can have profound effects on dispersal decisions made by helpers. Despite its importance in explaining group size and predicting the population demography of cooperative breeders, our current understanding of how individual traits influence animal behavior after disruptions to social structure is incomplete particularly for terrestrial mammals. We used 12 yr of genetic sampling and group pedigrees of gray wolves (Canis lupus) in Idaho, USA, to ask questions about how breeder turnover affected the apparent decisions by mature helpers (≥2-yr-old) to stay or leave a group over a 1-yr time interval. We found that helpers showed plasticity in their responses to breeder turnover. Most notably, helpers varied by sex and appeared to base dispersal decisions on the sex of the breeder that was lost as well. Male and female helpers stayed in a group slightly more often when there was breeder turnover of the same sex, although males that stayed were often recent adoptees in the group. Males, however, appeared to remain in a group less often when there was breeding female turnover likely because such vacancies were typically filled by related females from the males' natal group (i.e. inbreeding avoidance). We show that helpers exploit instability in the breeding pair to secure future breeding opportunities for themselves. The confluence of breeder turnover, helper sex, and dispersal and breeding strategies merge to influence group composition in gray wolves. [ABSTRACT FROM AUTHOR]

Cooperative breeding occurs when individuals contribute parental care to offspring that are not their own. Numerous intra- and interspecific studies have aimed to explain the evolution of this behavior. Recent comparative work suggests that family living (i.e. when offspring remain with their parents beyond independence) is a critical stepping stone in the evolution of cooperative breeding. Thus, it is key to understand the factors that facilitate the evolution of family living. Within-species studies suggest that protection from predators is a critical function of group living, through both passive benefits such as dilution effects and active benefits such as prosocial antipredator behaviors in family groups. However, the association between predation risk and the formation and prevalence of family groups and cooperative breeding remains untested globally. Here, we use phylogenetic comparative analyses including 2,984 bird species to show that family living and cooperative breeding are associated with increased occurrence of avian predators. These cross-species findings lend support to previous suggestions based on intraspecific studies that social benefits of family living, such as protection against predation, could favor the evolution of delayed dispersal and cooperative breeding. [ABSTRACT FROM AUTHOR]

Animals require a nutritionally balanced diet to support growth and reproduction. The geometric framework for nutrition asserts that animals actively balance their nutritional intake to maintain physiological homeostasis and optimize task performance to increase fitness. Both solitary and social animals will adjust their relative consumption of nutritionally distinct resources to meet their intake target ratio. Honey bees are eusocial insects whose primary source of macronutrients comes from floral pollen, including the essential fatty acids, omega-6 (linoleic acid) and omega-3 (alpha-linolenic acid). These must be actively balanced, as an unbalanced diet skewed towards a high omega-6:3 ratio reduces life span, reduces the size of the hypopharyngeal glands that produce jelly to feed larvae and impairs performance in cognition tests. As honey bees show a division of labour by age, we hypothesized that consuming an unbalanced diet would impact the timing of task transitions and nursing activity. To test this, we fed 1-day-old adult workers either a balanced (omega-6:3 ratio = 1) or unbalanced (omega-6:3 ratio = 5) diet for 7 days, after which they were released into a common-garden hive. Workers were tagged with barcodes and filmed continuously for 6 days, allowing analysis of nursing behaviour of individuals. The unbalanced diet delayed the onset of nursing, reduced the rate of nursing visits and affected the relative attention devoted between 3-day-old and 4-day-old larvae. We discuss these findings in the context of division of labour and nurse–larvae interactions, and identify novel avenues for further research linking fitness-related behaviours to nutritional balancing. • We tested how an unbalanced dietary omega-6:3 ratio affected nursing behaviour. • Nurses fed an unbalanced diet commenced nursing activity later. • They also visited larvae less frequently. • Diet affected the distribution of nursing visits among 3- and 4-day-old larvae. [ABSTRACT FROM AUTHOR]

Engagements in Islamic knowledge search have proved an important aspect of the religious path for Muslim women worldwide. This article testifies that that is also the case for pious Danish Muslim women. Based on extensive fieldwork, it describes how pious Danish Muslim women make an effort to find time for Islamic educational engagements in an everyday life of other obligations to maintain a continuous commitment to learning about Islam, and it describes the various routes to knowledge that the women employ. Throughout, it is argued that temporal and social aspects are key to consider if we are to understand the engagement of the women. First, I show that everyday commitments and time management in relation to such commitments are key for understanding how Danish Muslim women's engagement in Islamic education unfolds. Second, I consider the engagement as shaped by the women's social embeddedness in an everyday life of different commitments and ambitions and as cultivated through social bonds. [ABSTRACT FROM AUTHOR]

Background: In palliative care, the Utrecht Symptom Diary – 4 Dimensional (USD-4D), a Dutch-adapted and validated patient-reported outcome measure, supports multidimensional symptom management through identification and monitoring of, as well as dialogue on symptoms and needs. For the USD-4D to optimally support patients' autonomy, it is essential to know what patients need to use it. Objective: This study aims to identify what patients need when using the USD-4D in clinical palliative care. Design: A generic qualitative design with primary and secondary analyses of semistructured interviews. Methods: Patients ⩾18 years with a life-limiting illness were purposefully recruited within hospice and home care settings if they were in their last year of life as identified by the surprise question. Patients had to be aware of their life-threatening condition. Patients were selected in two tranches. In the first tranche, patients had to have completed the USD-4D at least once. The second tranche consisted of patients who were not familiar with the USD-4D in clinical practice and were interviewed in a previous study on the content validity of the USD-4D. The interviews were transcribed verbatim and were subjected to thematic analysis. Results: Twenty-five patients were included (14 men, ages 44–87). Patients' needs when using the USD-4D were summarized in three themes: (1) feeling invited, (2) being aware of the purpose and function of the USD-4D, and (3) experiencing a personal and nonjudgmental approach. Conclusion: For patients to optimally benefit from the USD-4D as a supportive measure of their autonomy in clinical palliative care, it is essential that they feel invited to use it. Healthcare providers are tasked with setting the right preconditions for patients to want and to be able to use the USD-4D. For patients, this means healthcare providers should always be attuned to their personal preferences when communicating the purpose and function of the USD-4D and when they enter into dialogue with them. [ABSTRACT FROM AUTHOR]

Background: A structure of everyday life creates routines and a sense of familiarity, which provides a recognizable basis for being and acting in the world. A structure of everyday life reduces stress, and daily stress has consistently been associated with higher levels of psychiatric symptoms. Little is known about how patients with schizophrenia and severe social impairment structure their lives. Thus, we aimed to explore the everyday lives of this group of patients, looking for structuring elements. Methods: In this qualitative study, we included patients diagnosed with schizophrenia who were either homeless or had difficulties reporting for treatment and, thus, needed treatment from an outreach team. Results: 17 participants were included in the study. We found only few structuring elements across all participants in the qualitative analyses. We identified five themes in our sample that serve as structuring elements in the everyday life: social interactions, volunteering to assist with basic tasks, self-initiated routines such as going for a walk daily, exoskeleton (structure provided by others), and having pets. None of the participants reported much activity during the day, and for most of them, social interactions were minimal. Discussion: All the participants had very little structure and routines in their everyday life. The shelters provided the homeless participants with some structuring elements, whereas the domiciled participants had no external structuring elements. The findings have important implications for psychosocial treatment of severe social impairment in schizophrenia. The lack of structure in these patients' everyday lives highlights the need for targeted interventions that could facilitate such structures and guide social involvement and personal recovery. [ABSTRACT FROM AUTHOR]

The performance in multi-agent reinforcement learning (MARL) scenarios has usually been analysed in homogeneous teams with a few choices for the sociality regime (selfish, egalitarian, or altruistic). In this paper we analyse both homogeneous and heterogeneous teams in a variation of sociality regimes in the predator-prey game, using a novel normalisation of the weights so that the sum of all rewards is independent of the sociality regime. We find that the selfish regime is advantageous for both predator and prey teams, and for both homogeneous and heterogeneous teams. In particular, rewards are about 100% higher for the predator team when switching from the egalitarian to selfish regime and more than 400% higher from the altruistic regime. For the prey, the increase is around 40% and 100% respectively. The results are similar for homogeneous and heterogeneous situations. The takeaway message is that any study of homogeneous and heterogeneous cooperative-competitive multi-agent reinforcement learning teams should also take into account the sociality regimes before making conclusions on the preference of any algorithm. [ABSTRACT FROM AUTHOR]

Social organization, dispersal and fecundity coevolve, but whether they are genetically linked remains little known. Supergenes are prime candidates for coupling adaptive traits and mediating sex-specific trade-offs. Here, we test whether a supergene that controls social structure in Formica selysi also influences dispersal-related traits and fecundity within each sex. In this ant species, single-queen colonies contain only the ancestral supergene haplotype M and produce MM queens and M males, while multi-queen colonies contain the derived haplotype P and produce MP queens, PP queens and P males. By combining multiple experiments, we show that the M haplotype induces phenotypes with higher dispersal potential and higher fecundity in both sexes. Specifically, MM queens, MP queens and M males are more aerodynamic and more fecund than PP queens and P males, respectively. Differences between MP and PP queens from the same colonies reveal a direct genetic effect of the supergene on dispersal-related traits and fecundity. The derived haplotype P, associated with multi-queen colonies, produces queens and males with reduced dispersal abilities and lower fecundity. More broadly, similarities between the Formica and Solenopsis systems reveal that supergenes play a major role in linking behavioural, morphological and physiological traits associated with intraspecific social polymorphisms. [ABSTRACT FROM AUTHOR]

This Introduction provides an overview of the topics and discussions addressed in the Special Issue 'Environments and Socialities in Oceania'. It focuses on the phenomenon that people in Oceania engage in new globalised or transnational environmental and social challenges through dialogue and interaction with various global and local actors, both human and other-than-human, who offer various (new) ideas and practices. We present two linked perspectives of looking at this: Firstly, it becomes crucial to concentrate on the fundamental assumptions of individuals in Oceania when dealing with changes. Secondly, ethnographic research should consider "encounters across difference" (Tsing 2005). In these encounters between actors in different settings, 'environmental' and 'social' become of great importance in different context-specific interpretations and forms. While they can be accompanied by disagreements, they also create dialogues and collaborations, and people develop novel concepts and methods. With an ethnographic description of the authors' research on climate change in Vanuatu, alongside the contributions to different forms of encounters in the Anthropocene, this Special Issue highlights the innovative and creative abilities of people living in Oceania. [ABSTRACT FROM AUTHOR]

Fiji Islander sociality has long been characterised by high levels of diversity as well as interwoven categories of (self-)inclusion and (self-)exclusion and is increasingly shaped by urbanism and transborder mobility. This article focuses on how Fijians in town and abroad constitute self and belonging between vanua, 'land', and vakavanua, 'tradition', on the one hand, and the urban and migrant life worlds they inhabit, on the other. Being conceptually framed as a discussion piece and drawing on ethnographic research in urban Fiji as well as among the Fiji diaspora in Japan and Australia, this article takes a cross-comparative approach. It sheds light on the ongoing engagement among Fijian professionals with (vaka)vanua despite its relative absence as a tangible factor in their daily lives. Focusing on the dynamic undercurrents of (vaka)vanua and its social and political meanings from the perspective of three different research trajectories and settings, the discussion reveals that being Fijian in today's world engenders new engagements with 'land' and 'tradition' in manifold and challenging ways. [ABSTRACT FROM AUTHOR]

Vision is a ubiquitous sensory modality adapted to vastly different environments, which place variable selection pressures on both macro- and microscopic dimensions of external eye morphology. The hermit crab clade (Crustacea: Decapoda: Anomura) spans environments from sea to land, yet, no systematic comparisons in eye morphology have been made between any species. We compared three species of hermit crabs inhabiting different ecological and social environments: two terrestrial species, one of which (Coenobita compressus H. Milne Edwards, 1837) is highly social and inhabits a flat, open diurnal habitat, and another (C. clypeatus Herbst, 1791) is its sister species that inhabits a rugged forested nocturnal habitat; and a third (Pagurus longicarpus Say, 1817) inhabits a marine intertidal habitat and is less social. We compared macroscopic eye morphology between species as well as microscopic differences in ommatidium-facet density and diameter within eyes. We found that eye dimensions (length, width, and thickness), but not overall volume, differed significantly between marine and terrestrial species. Furthermore, the highly social C. compressus had a significantly larger eye volume compared to its sister species, C. clypeatus , which is not as social. Larger eyes in C. compressus might be linked to its social lifestyle, where vision has been shown to be critical to finding conspecifics. All three species had a higher density of facets in the ventral compared to dorsal region of the eye. Our comparisons of external eye morphology revealed microscopic similarities but notable macroscopic variation between species, thus laying a foundation for future phylogenetically controlled tests within this species-rich clade, including comparisons of internal eye morphology. [ABSTRACT FROM AUTHOR]

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Although previous research has established a link between the variant rs53576 of the oxytocin receptor gene (OXTR) and social behaviors, our understanding of its long-term impact on mental health from early childhood to adolescence remains limited. This study aimed to explore the potential link between children's involvement in recreational activities with parents during early childhood, their OXTR rs53576 genotype, and the subsequent development of psychopathology. It involved gathering data during three different stages: early childhood (T1), middle childhood (T2), and adolescence (T3). During T1, the parents of 144 Chinese participants aged 4 to 6 years (48.6% boys) completed a scale on frequency of parent-child recreational activities. Three years later (T2), parents were re-surveyed about the participant's conduct problems, which was assessed using the Strength and Difficulties Questionnaire. Seven years later (T3), the participants completed the Depression scale of the Depression Anxiety and Stress Scale – 21 to evaluate their levels of depressive symptoms. Additionally, buccal swab samples were collected and genotyped for OXTR rs53576. OXTR rs53576 genotypes were found to interact with the frequency of parent-child recreational activities to predict future conduct problems (β=-1.38, p = 0.028). Increased conduct problems were in turn associated with a higher level of subsequent depressive symptoms during adolescence (r = 0.22, p < 0.05). Engaging in recreational activities with parents during early childhood is important for the overall well-being of children, particularly for those who demonstrate a tendency of being sociable. Early childhood interventions should educate and assist parents in designing unstructured play based on their young children's sociability. [ABSTRACT FROM AUTHOR]

Intrinsic rates of genetic mutation have diverged greatly across taxa and exhibit statistical associations with several other parameters and features. These include effective population size (Ne), genome size, and gametic multicellularity, with the latter being associated with both increased mutation rates and decreased effective population sizes. However, data sufficient to test for possible relationships between microbial multicellularity and mutation rate (µ) are lacking. Here, we report estimates of two key population-genetic parameters, Ne and µ , for Myxococcus xanthus , a bacterial model organism for the study of aggregative multicellular development, predation, and social swarming. To estimate µ , we conducted an ∼400-day mutation accumulation experiment with 46 lineages subjected to regular single colony bottlenecks prior to clonal regrowth. Upon conclusion, we sequenced one clonal-isolate genome per lineage. Given collective evolution for 85,323 generations across all lines, we calculate a per base-pair mutation rate of ∼5.5 × 10−10 per site per generation, one of the highest mutation rates among free-living eubacteria. Given our estimate of µ , we derived Ne at ∼107 from neutral diversity at four-fold degenerate sites across two dozen M. xanthus natural isolates. This estimate is below average for eubacteria and strengthens an already clear negative correlation between µ and Ne in prokaryotes. The higher and lower than average mutation rate and Ne for M. xanthus , respectively, amplify the question of whether any features of its multicellular life cycle—such as group-size reduction during fruiting-body development—or its highly structured spatial distribution have significantly influenced how these parameters have evolved. [ABSTRACT FROM AUTHOR]

Recent evidence indicates that individual behavioural variation in animals, defined as consistent individual differences in behaviour across contexts and time, influence ecological and evolutionary processes, and a growing number of studies demonstrate that individual behavioural variation can play a large role in shaping grouping dynamics among social animals. We studied the common degu, Octodon degus , a social rodent, to evaluate whether individual behavioural variation underlies social organization and the reproductive success of individuals within groups. We examined social groups in a population in central-north Chile during one breeding season, tested 67 adults in an open field test (i.e., the propensity to explore an unfamiliar environment) and 62 adults in a poke test (i.e., the propensity to charge an object) to quantify individual behavioural variation, determined assortment based on individual behavioural differences across 19 social groups, and performed genetic analyses to assess reproductive success. We found that the response to the poke test was repeatable, while none of the behaviours from an open field test were. The repeatable behaviour during the poke test was not associated to components of social organization (group composition), or to reproductive success. These findings imply that individual behavioural variation did not affect grouping patterns or direct fitness in this degu population. [ABSTRACT FROM AUTHOR]

Parasites and infectious diseases constitute important challenges particularly for group-living animals. Social contact and shared space can both increase parasite transmission risk, while individual differences in social capital can help prevent infections. For example, high social status individuals and those with more or stronger affiliative partnerships may have better immunity and, thus, lower parasitic burden. To test for health trade-offs in the costs and benefits of sociality, we quantified how parasitic load varied with an individual's social status, as well as with their affiliative relationships with weakly and strongly bonded partners, in a free-ranging population of rhesus macaques, Macaca mulatta. We found that high status was associated with a lower risk of protozoa infection at older ages compared to younger and low-status animals. Social resources can also be protective against infection under environmentally challenging situations, such as natural disasters. Using cross-sectional data, we additionally examined the impact of a major hurricane on the sociality - parasite relationship in this system and found that the hurricane influenced the prevalence of specific parasites independent of sociality. Overall, our study adds to the growing evidence for social status as a strong predictor of infection risk and highlights how extreme environmental events could shape vulnerability and resistance to infection. • Old high-status animals had lower risk of protozoa infection. • Social status did not buffer infection risk after an acute natural disaster. • More connected individuals had lower infection risk. [ABSTRACT FROM AUTHOR]

This article examines sociality and sociability as interdependent concepts, where sociality represents individuals' innate predisposition to engage in social interactions, and sociability reflects the manifestation of these interactions in social networks and relationships. The analysis highlights how social structures influence sociability, with cooperative and participatory forms stimulating it, while competitive and elitist forms inhibit it. Although individuals are shaped by collective norms and values, they retain the capacity to create and innovate, thus facilitating social change and maintaining a balance between stability and evolution in society. Sociological paradigms such as positivism, social exchange theory, and Max Weber's theory of social action provide different frameworks for understanding human interactions. Positivism emphasizes social order, while social exchange theory explores reciprocity and benefit maximization, extending beyond material exchanges to include symbolic relationships. Weber's theory highlights the subjective meaning individuals attribute to their interactions, illustrating the complexity of human motivations. The article also explores the role of religion and morality in maintaining social cohesion, focusing on how they evolve as societies transition from mechanical solidarity to organic solidarity. [ABSTRACT FROM AUTHOR]

Top krill predators such as the Antarctic minke whale (AMW) serve a vital role within the fragile Antarctic sea-ice ecosystem. They are an abundant krill specialist, but their ecological role in the Antarctic remains poorly understood due to their cryptic behavior and remote habitat. It is therefore crucial to develop a baseline understanding of their basic social and foraging ecology. This study uses animal-borne camera tags to quantitatively explore these critical ecological aspects. Twenty-eight tags were deployed on AMW between 2018 and 2019 in Andvord and Paradise Bays around the Western Antarctic Peninsula. Tag data were analyzed with respect to diving, foraging, and social behavior. Results suggest the presence of loose fission-fusion sociality, with individuals forming short-term associations in 60.6% of cases including both foraging and non-foraging contexts. Socializing was significantly more common for larger individuals and resulted in a significant decrease in foraging rates for both shallow (< 30 m) and deep (> 30 m) dives. There were 12 instances of simultaneously tagged individuals that associated with one another in pairs or trios, displaying synchronized spatial movement and diving behavior. These data illustrated the use of group foraging strategies, with high incidence of synchronized foraging dives (67.5% of associated dives) and lunges (64% of associated lunges). Our results provide clear baseline information on AMW sociality and group foraging, which will help direct future studies for more targeted work. This study will improve our ability to understand the relationship between Antarctic species and their environment as climate change continues to alter the ecosystem landscape. Significance: Baseline information on sociality is thus key to understanding broader species ecology, which is especially important for keystone species. Our study is the first to directly provide these foundational insights for AMW, a common krill predator in the Antarctic sea-ice ecosystem. Individuals displayed short-term associations in a fission-fusion social structure similar to other baleen whale species, and socializing was associated with both larger individuals and lower foraging rates. In simultaneous tag deployments, tagged individuals frequently associated with one another and displayed synchronized diving and foraging behavior. Our results suggest that sociality may be more important to minke whale ecology than previously thought. These results provide necessary baseline information for more targeted ecological questions, such as the benefit of group foraging or how such precise synchrony might be coordinated. [ABSTRACT FROM AUTHOR]