scholarly journals Social groups buffer maternal loss in mountain gorillas

eLife ◽  
2021 ◽  
Vol 10 ◽  
Author(s):  
Robin E Morrison ◽  
Winnie Eckardt ◽  
Fernando Colchero ◽  
Veronica Vecellio ◽  
Tara S Stoinski

Mothers are crucial for mammals’ survival before nutritional independence, but many social mammals reside with their mothers long after. In these species the social adversity caused by maternal loss later in life can dramatically reduce fitness. However, in some human populations these negative consequences can be overcome by care from other group members. We investigated the consequences of maternal loss in mountain gorillas and found no discernible fitness costs to maternal loss through survival, age at first birth, or survival of first offspring through infancy. Social network analysis revealed that relationships with other group members, particularly dominant males and those close in age, strengthened following maternal loss. In contrast to most social mammals, where maternal loss causes considerable social adversity, in mountain gorillas, as in certain human populations, this may be buffered by relationships within cohesive social groups, breaking the link between maternal loss, increased social adversity, and decreased fitness.

Author(s):  
Robin E Morrison ◽  
Winnie Eckardt ◽  
Fernando Colchero ◽  
Veronica Vecellio ◽  
Tara S Stoinski

AbstractMothers are crucial for mammals’ survival before nutritional independence, but many social mammals reside with their mothers long after. In these species the social adversity caused by maternal loss later in life can dramatically reduce fitness. However, in some human populations these negative consequences appear to be overcome by care from other group members. We investigated the consequences of maternal loss in mountain gorillas and found no discernible fitness costs to maternal loss through survival, age at first birth or survival of first offspring through infancy. Social network analysis revealed that maternal loss led to strengthened relationships with other group members, particularly the dominant male and age-mates. In contrast to most social mammals, where maternal loss causes considerable social adversity, in mountain gorillas, as in certain human populations, this may be buffered by relationships within cohesive social groups, breaking the link between maternal loss, increased social adversity and decreased fitness.


Behaviour ◽  
1994 ◽  
Vol 131 (1-2) ◽  
pp. 97-113 ◽  
Author(s):  
Dario Maestripieri

AbstractThis study compared social interactions between mothers, infants, and other group members in rhesus, pigtail, and stumptail macaques living in large captive social groups. Mother-infant pairs were focally observed in 4 weekly 30-min sessions for the first 12 weeks of infant life. Rhesus and pigtail mothers were remarkably similar in several contact, proximity, and grooming measures, but their scores were lower than those of stumptail mothers. The three species did not differ quantitatively in interest shown in infants by other group members, as measured by infant handling and grooming. Infant handling in stumptail macaques was always gentle and infants were carefully avoided by other group members when off their mothers. Infant handling in rhesus and pigtail macaques also involved harassment and kidnapping. The frequency of infant harassment did not differ in rhesus and pigtail macaques but harassment was more severe in the former than in the latter species. Rhesus mothers reacted aggressively to a higher proportion of infant handling attempts than pigtail and stumptail mothers. These results confirm the hypotheses that female interest in infants does not differ among macaque species and that the quality of infant handling is a good predictor of interspecies differences in maternal protectiveness. Mothering style, however, is probably multidimensionally determined, and to fully understand interspecies differences in mother-infant relationships and their functional significance, we need to understand the mechanisms by which reproductive and ecological variables influence maternal behavior and infant development in primates.


2021 ◽  
Author(s):  
Frank Kachanoff ◽  
Kurt Gray ◽  
Richard Koestner ◽  
Nour Kteily ◽  
Michael Jeremy Adam Wohl

People experience “collective autonomy restriction” when they believe other groups want to restrict their own group from freely expressing its social identity and determining its behavior. We review emerging research on the negative consequences of collective autonomy restriction for well-being, as well as its implications for group members’ motivation to fight for their place within social hierarchies. We propose that group members desire two resources tied to having a favorable position within the social hierarchy – structural power (i.e., the ability to influence and resist influence from other groups) and status (being positively valued and perceived as moral by others) – because they believe that having power and status are necessary to secure their group’s collective autonomy. We hypothesize that group members anticipate that other groups might restrict their group if they lack the structural power to resist outside influences, or if they are perceived as negative or immoral and worthy of restriction. We apply this power and status perspective of collective autonomy restriction to predict (1) when disempowered groups are most likely to fight against (vs. tolerate) their disadvantaged position and (2) when powerful groups are most likely to relinquish power and acknowledge their transgressions (versus defensively maintain their privileged position).


2020 ◽  
Author(s):  
Csongor I. Vagasi ◽  
Attila Fulop ◽  
Gergely Osvath ◽  
Peter L. Pap ◽  
Janka Penzes ◽  
...  

Social groups often consist of diverse phenotypes, including personality types, and this diversity is known to affect the functioning of the group as a whole. Social selection theory proposes that group composition (i.e. social environment) also influences the performance of individual group members. However, the effect of group behavioural composition on group members remains largely unexplored, and it is still contentious whether individuals benefit more in a social environment with homogeneous or diverse behavioural composition. We experimentally formed groups of house sparrows Passer domesticus with high and low diversity of personality (exploratory behaviour), and found that their physiological state (body condition, physiological stress and oxidative damage) improved with increasing group-level diversity of personality. These findings demonstrate that group personality composition affects the condition of group members and individuals benefit from social heterosis (i.e. associating with a diverse set of behavioural types). This aspect of the social life can play a key role in affiliation rules of social animals and might explain the evolutionary coexistence of different personalities in nature.


2020 ◽  
Vol 6 (3) ◽  
pp. eaay5781 ◽  
Author(s):  
Zheren Zhang ◽  
Chao Du ◽  
Frédérique de Barsy ◽  
Michael Liem ◽  
Apostolos Liakopoulos ◽  
...  

One of the hallmark behaviors of social groups is division of labor, where different group members become specialized to carry out complementary tasks. By dividing labor, cooperative groups increase efficiency, thereby raising group fitness even if these behaviors reduce individual fitness. We find that antibiotic production in colonies of Streptomyces coelicolor is coordinated by a division of labor. We show that S. coelicolor colonies are genetically heterogeneous because of amplifications and deletions to the chromosome. Cells with chromosomal changes produce diversified secondary metabolites and secrete more antibiotics; however, these changes reduced individual fitness, providing evidence for a trade-off between antibiotic production and fitness. Last, we show that colonies containing mixtures of mutants and their parents produce significantly more antibiotics, while colony-wide spore production remains unchanged. By generating specialized mutants that hyper-produce antibiotics, streptomycetes reduce the fitness costs of secreted secondary metabolites while maximizing the yield and diversity of these products.


Communication ◽  
2019 ◽  
Author(s):  
Charles M. Rowling

In the 1970s, scholars in social psychology began exploring the process by which individuals attach their own identity to the groups in which they associate. This gave rise to social identity theory, which rests on the notion that, through largely unconscious cognitive processes, individuals who value and closely identify with a particular social group (e.g., familial, ethnic, religious, gender, partisan, national, etc.) will tend to take on characteristics and exhibit behaviors that are consistent with positive attributes associated with that group. Social identity theory also suggests that individuals do more than merely identify with the social groups to which they belong; they also derive comfort, security, and self-esteem from these groups. As a result, group members often engage in favoritism toward their own social group and, at times, denigration of other social groups as a way to protect or enhance their own group identity. Because individuals identify with multiple groups, the concept of salience is also crucial to our understanding of social identity theory. Specifically, individuals will seek to protect or enhance a particular group identity (through words or actions) when they perceive it to be threatened or they sense an opportunity to promote or enhance it. Given the obvious import and relevance of these dynamics to various aspects of society, research on social identity theory has grown exponentially over the past several decades, especially within the social sciences. Scholars in the fields of psychology, sociology, political science, and communication, for example, have increasingly paid attention to and incorporated social identity theory into their study of everything from how politicians communicate to how people vote to how people interact with other cultures. Notably, within the field of communication, the value of social identity theory rests with its ability to explain or predict messaging and response behaviors when a particular group identity is made salient. Thus, social identity theory is a robust theoretical framework that, in recent years, has had broad appeal and application across a number of academic disciplines. With a focus on the intersection of social identity theory and communication research, this article seeks to identify the foundational works within this area of research, recognize the primary journals in which this research can be found, discuss the key concepts and terms associated with this research, and explore how social identity theory has evolved both theoretically and empirically since its inception in the 1970s.


2021 ◽  
Vol 288 (1943) ◽  
pp. 20203092
Author(s):  
Csongor I. Vágási ◽  
Attila Fülöp ◽  
Gergely Osváth ◽  
Péter L. Pap ◽  
Janka Pénzes ◽  
...  

Social groups often consist of diverse phenotypes, including personality types, and this diversity is known to affect the functioning of the group as a whole. Social selection theory proposes that group composition (i.e. social environment) also influences the performance of individual group members. However, the effect of group behavioural composition on group members remains largely unexplored, and it is still contentious whether individuals benefit more in a social environment with homogeneous or diverse behavioural composition. We experimentally formed groups of house sparrows Passer domesticus with high and low diversity of personality (exploratory behaviour), and found that their physiological state (body condition, physiological stress and oxidative damage) improved with increasing group-level diversity of personality. These findings demonstrate that group personality composition affects the condition of group members and individuals benefit from social heterosis (i.e. associating with a diverse set of behavioural types). This aspect of the social life can play a key role in affiliation rules of social animals and might explain the evolutionary coexistence of different personalities in nature.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
James Flamino ◽  
Boleslaw K. Szymanski ◽  
Ashwin Bahulkar ◽  
Kevin Chan ◽  
Omar Lizardo

AbstractUnderstanding why people join, stay, or leave social groups is a central question in the social sciences, including computational social systems, while modeling these processes is a challenge in complex networks. Yet, the current empirical studies rarely focus on group dynamics for lack of data relating opinions to group membership. In the NetSense data, we find hundreds of face-to-face groups whose members make thousands of changes of memberships and opinions. We also observe two trends: opinion homogeneity grows over time, and individuals holding unpopular opinions frequently change groups. These observations and data provide us with the basis on which we model the underlying dynamics of human behavior. We formally define the utility that members gain from ingroup interactions as a function of the levels of homophily of opinions of group members with opinions of a given individual in this group. We demonstrate that so-defined utility applied to our empirical data increases after each observed change. We then introduce an analytical model and show that it accurately recreates the trends observed in the NetSense data.


2020 ◽  
Vol 23 (6) ◽  
pp. 808-826
Author(s):  
Alicia Cork ◽  
Richard Everson ◽  
Mark Levine ◽  
Miriam Koschate

The social identity approach suggests that group prototypical individuals have greater influence over fellow group members. This effect has been well-studied offline. Here, we use a novel method of assessing prototypicality in naturally occurring data to test whether this effect can be replicated in online communities. In Study 1a ( N = 53,049 Reddit users), we train a linguistic measure of prototypicality for two social groups: libertarians and entrepreneurs. We then validate this measure further to ensure it is not driven by demographics (Study 1b: N = 882) or local accommodation (Study 1c: N = 1,684 Silk Road users). In Study 2 ( N = 8,259), we correlate this measure of prototypicality with social network indicators of social influence. In line with the social identity approach, individuals who are more prototypical generate more responses from others. Implications for testing sociopsychological theories with naturally occurring data using computational approaches are discussed.


2021 ◽  
pp. 136843022110235
Author(s):  
Anna Stefaniak ◽  
Michael J. A. Wohl

The racial demographic shift occurring in many Western countries provides a unique context to study the reactions of a high-power group (White people) to the potential loss of their privileged position in society. Three experiments ( N = 77, N = 302, N = 555) conducted in Canada, the US, and the UK showed that White people who are reminded about the ongoing demographic changes and who see race relations as a zero-sum game whereby any gains by minorities must come at the expense of the majority, experience stronger collective angst and, to a lesser extent, fear (but not anger). In turn, collective angst, but not the other negative group-based emotions, fuels their motivation to protect the existing intergroup hierarchy by withdrawing support for progressive social movements and increases anti-immigration sentiments. Downregulating the existential threat experienced by White majorities in the face of a racial demographic shift may be one way to reduce acrimonious behavioral intentions aimed at preserving their place in the social hierarchy.


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