Habitat use by western black widow spiders (Latrodectus hesperus) in coastal British Columbia: evidence of facultative group living

2010 ◽  
Vol 88 (3) ◽  
pp. 334-346 ◽  
Author(s):  
Maxence Salomon ◽  
Samantha Vibert ◽  
Robert G. Bennett
Keyword(s):  
British Columbia ◽  
Social Structure ◽  
Social Evolution ◽  
Social Systems ◽  
Group Living ◽  
Black Widow ◽  
Latrodectus Hesperus ◽  
The Social ◽  
Wide Range ◽  
Coastal British Columbia

Animal social systems come in a wide range of forms characterized by different types of group-living relationships. Species that express facultative group-living behaviours, where individuals only associate under certain conditions or at certain times, are especially interesting for studying social evolution. We investigated the social structure of the western black widow spider ( Latrodectus hesperus Chamberlin and Ivie, 1935) over 5 years in a coastal British Columbia habitat, and present the first comprehensive evidence of facultative group living in the genus Latrodectus Walckenaer, 1805. Latrodectus hesperus have a flexible social structure that varies seasonally, wherein individuals (mostly females) either form groups or live solitarily. In the fall and early winter, females spontaneously form groups of 2–8 individuals, but live alone during the oviposition season in the spring and summer. When living in groups spiders share large webs and are tolerant of each other, although they appear to forage individually. We also report on the relationships between different ecological factors and the social structure of L. hesperus, including the interaction of these spiders with two co-occurring species of introduced spiders ( Tegenaria agrestis (Walckenaer, 1802) and Tegenaria duellica Simon, 1875). Our findings suggest that L. hesperus is a good model system with which to explore the mechanisms involved in the evolution of sociality.

New research frameworks in the study of chimpanzee and gorilla sociality and communication

2019 ◽  
Author(s):  
Sam G. B. Roberts ◽  
Anna Roberts
Keyword(s):  
Social Evolution ◽  
Social Complexity ◽  
Brain Size ◽  
Social Systems ◽  
Strongly Correlated ◽  
The Social ◽  
Human Social Evolution ◽  
Research Frameworks ◽  
New Research ◽  
Large Groups

Group size in primates is strongly correlated with brain size, but exactly what makes larger groups more ‘socially complex’ than smaller groups is still poorly understood. Chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla) are among our closest living relatives and are excellent model species to investigate patterns of sociality and social complexity in primates, and to inform models of human social evolution. The aim of this paper is to propose new research frameworks, particularly the use of social network analysis, to examine how social structure differs in small, medium and large groups of chimpanzees and gorillas, to explore what makes larger groups more socially complex than smaller groups. Given a fission-fusion system is likely to have characterised hominins, a comparison of the social complexity involved in fission-fusion and more stable social systems is likely to provide important new insights into human social evolution

scholarly journals Genetic relatedness delineates the social structure of southern Australian bottlenose dolphins

2019 ◽  
Vol 30 (4) ◽  
pp. 948-959 ◽  
Author(s):  
Fernando Diaz-Aguirre ◽  
Guido J Parra ◽  
Cecilia Passadore ◽  
Luciana Möller
Keyword(s):  
Social Structure ◽  
Genetic Relatedness ◽  
Social Systems ◽  
Bottlenose Dolphins ◽  
South Australia ◽  
Intrinsic Factors ◽  
Photo Identification ◽  
The Social ◽  
Modularity Analysis ◽  
Network Metrics

AbstractSocial relationships represent an adaptive behavioral strategy that can provide fitness benefits to individuals. Within mammalian societies, delphinids are known to form diverse grouping patterns and show a variety of social systems. However, how ecological and intrinsic factors have shaped the evolution of such diverse societies is still not well understood. In this study, we used photo-identification data and biopsy samples collected between March 2013 and October 2015 in Coffin Bay, a heterogeneous environment in South Australia, to investigate the social structure of southern Australian bottlenose dolphins (Tursiops cf. australis). Based on the data from 657 groups of dolphins, we used generalized affiliation indices, and applied social network and modularity methods to study affiliation patterns among individuals and investigate the potential presence of social communities within the population. In addition, we investigated genetic relatedness and kinship relationships within and between the communities identified. Modularity analysis revealed that the Coffin Bay population is structured into 2 similar sized, mixed-sex communities which differed in ranging patterns, affiliation levels and network metrics. Lagged association rates also indicated that nonrandom affiliations persisted over the study period. The genetic analyses suggested that there was higher relatedness, and a higher proportion of inferred full-sibs and half-sibs, within than between communities. We propose that differences in environmental conditions between the bays and kinship relationships are important factors contributing to the delineation and maintenance of this social structure.

A Review of Black Widow (Araneae: Theridiidae) Envenomation, Epidemiology, and Antivenom Utilization in Canada

2020 ◽  
Author(s):  
Gwynn Curran-Sills ◽  
Steven M Wilson ◽  
Robb Bennett
Keyword(s):  
British Columbia ◽  
Nova Scotia ◽  
Geographical Distribution ◽  
Retrospective Review ◽  
Black Widow ◽  
Latrodectus Hesperus ◽  
Average Patient ◽  
Health Canada ◽  
Access Program ◽  
Widow Spider

Abstract Two species of black widow spider (BWS—Latrodectus hesperus Chamberlin & Ivie and Latrodectus variolus Walckenaer) naturally occur in Canada and are capable of causing deleterious envenomation to humans. No Canadian literature exists on the frequency of envenomations by these species or the use of antivenom in the treatment of those patients. A review of primary Canadian arachnology data was undertaken to identify BWS populations. A retrospective review of the Health Canada Special Access Program records generated epidemiology and the utilization of antivenom for BWS envenomations in Canada. The geographical distribution of BWS species is limited to along the southern Canadian border. From January 2009 to December 2015, there were five BWS envenomations that required treatment with antivenom and all cases occurred in British Columbia. An average patient age of 41 yr ± 21 SD (range 7–59) was observed, along with three of the five patients being female. The average number of vials used for treatment was 2 ± 1 SD (range 1–3). BWS Antivenin was also obtained by facilities in Alberta, Ontario, and Nova Scotia, but not used in any of these jurisdictions. Further investigation is necessary to determine the annual incidence of BWS envenomations and if treatment with BWS antivenin is required.

The social structure of free and open source software development

First Monday ◽  
2005 ◽  
Author(s):  
Kevin Crowston ◽  
James Howison
Keyword(s):  
Social Structure ◽  
Open Source Software ◽  
Tracking System ◽  
Communication Patterns ◽  
Project Teams ◽  
Development Teams ◽  
The Social ◽  
Wide Range ◽  
Bug Tracking ◽  
The Relationship

Metaphors, such as the Cathedral and Bazaar, used to describe the organization of FLOSS projects typically place them in sharp contrast to proprietary development by emphasizing FLOSS’s distinctive social and communications structures. But what do we really know about the communication patterns of FLOSS projects? How generalizable are the projects that have been studied? Is there consistency across FLOSS projects? Questioning the assumption of distinctiveness is important because practitioner–advocates from within the FLOSS community rely on features of social structure to describe and account for some of the advantages of FLOSS production. To address this question, we examined 120 project teams from SourceForge, representing a wide range of FLOSS project types, for their communications centralization as revealed in the interactions in the bug tracking system. We found that FLOSS development teams vary widely in their communications centralization, from projects completely centered on one developer to projects that are highly decentralized and exhibit a distributed pattern of conversation between developers and active users. We suggest, therefore, that it is wrong to assume that FLOSS projects are distinguished by a particular social structure merely because they are FLOSS. Our findings suggest that FLOSS projects might have to work hard to achieve the expected development advantages which have been assumed to flow from "going open." In addition, the variation in communications structure across projects means that communications centralization is useful for comparisons between FLOSS teams. We found that larger FLOSS teams tend to have more decentralized communication patterns, a finding that suggests interesting avenues for further research examining, for example, the relationship between communications structure and code modularity.

Strategic and tactical fighting decisions in cichlid fishes with divergent social systems

Behaviour ◽  
2014 ◽  
Vol 151 (1) ◽  
pp. 47-71 ◽  
Author(s):  
Kristina Hick ◽  
Adam R. Reddon ◽  
Constance M. O’Connor ◽  
Sigal Balshine
Keyword(s):  
Social Systems ◽  
Cichlid Fish ◽  
Group Living ◽  
Social Situation ◽  
Closely Related Species ◽  
Social Species ◽  
Hierarchy Formation ◽  
Trade Offs ◽  
The Social ◽  
Contest Behaviour

The costs and benefits of engaging in a contest will differ depending on the social situation of the individuals involved. Therefore, understanding contest behaviour can help to elucidate the trade-offs of living in differing social systems and shed light on the evolution of social behaviour. In the current study, we compared contest behaviour in two closely related species of Lamprologine cichlid fish. Neolamprologus pulcher and Telmatochromis temporalis are both pair-breeding cichlids, but N. pulcher are highly social, group-living fish, while T. temporalis display no grouping behaviour. To examine how competition varies by species, sex and familiarity, we staged same-sex conspecific contests over a shelter, a resource that is highly valued by both species, where contestants were either familiar or unfamiliar to one another. When we examined tactical and strategic components of these contests, we found that the highly social species had shorter contests and engaged in fewer costly aggressive acts than did the non-social species. Individuals of the highly social species were also more likely to resolve conflicts through the use of submissive displays, while individuals of the non-social species were more likely to flee from conflict. Familiarity increased the use of submissive displays in the highly social species but not in the less social species. Our findings suggest that conflict resolution behaviour and dominance hierarchy formation are fundamentally linked to the evolution of complex social systems.

scholarly journals Introduction to the COVID-19 Second Special Issue

2020 ◽  
pp. 002216782096641
Author(s):  
Zenobia Morrill
Keyword(s):  
Meaning Making ◽  
Social Systems ◽  
Terror Management Theory ◽  
Terror Management ◽  
The Self ◽  
Management Theory ◽  
Special Issue ◽  
The Social ◽  
Wide Range ◽  
Collective Meaning

This introduction describes an original collection of articles that advance Existential-Humanistic (EH) psychology in a project of collective meaning-making during the COVID-19 pandemic. From contributions that apply terror management theory to political and ideological division, to those that intricately examine concepts of the self and radical emotional dwelling in psychotherapy, this issue spans a wide range of topics relevant to EH scholars and beyond. This special issue also explores phenomenological questions. The articles within not only reconfigure ways to be that align with humanistic commitments, but challenge readers to examine the social systems that shape these possibilities. For this reason, this introduction connects the applications of EH psychology included in this issue to other disciplines that have intimately analyzed subjectivities related to existential reckoning, injustice, and liberation.

Ideas about religious and political threats in Russian political science and philosophy

2020 ◽  
Vol 26 (7) ◽  
pp. 97-105
Author(s):  
I. Romanova ◽  
◽  
V. Mladenov ◽  
А. Zhukova ◽  
◽  
...  
Keyword(s):  
Social Order ◽  
Social Evolution ◽  
Religious Conflict ◽  
Social Adaptation ◽  
Religious Groups ◽  
Russian Scientific ◽  
Interaction Processes ◽  
The Social ◽  
Wide Range ◽  
The Right

The article analyzes the problems of religious threats in the framework of Russian philosophical, theological, sociological, psychological thought. The analysis was carried out based on the provisions of the theory of the social evolution of religion, theory of religious conflict and theory of social adaptation of religion. The results of the analysis showed that the situation of studies of the religious threat within the Russian scientific field is complicated by the active confrontation among authors of publications on this topic. A large group of authors publish works in which they indicate the existence of a threat to national security from all religions that are not considered traditional in Russia. Fulfilling a social order and reflecting their metaphysical beliefs, biased authors classify a wide range of religious groups as dangerous and extremist. On the contrary, another group of researchers publishes materials through which it tries not only to justify the need for scientifically verified research of state-confessional interaction processes, but also to protect the right of believers to exercise the right of religious choice

The social structure of free and open source software development (originally published in Volume 10, Number 2, February 2005)

First Monday ◽  
2005 ◽  
Author(s):  
Kevin Crowston ◽  
James Howison
Keyword(s):  
Social Structure ◽  
Open Source Software ◽  
Tracking System ◽  
Communication Patterns ◽  
Project Teams ◽  
Development Teams ◽  
The Social ◽  
Wide Range ◽  
Bug Tracking ◽  
The Relationship

Metaphors, such as the Cathedral and Bazaar, used to describe the organization of FLOSS projects typically place them in sharp contrast to proprietary development by emphasizing FLOSS’s distinctive social and communications structures. But what do we really know about the communication patterns of FLOSS projects? How generalizable are the projects that have been studied? Is there consistency across FLOSS projects? Questioning the assumption of distinctiveness is important because practitioner–advocates from within the FLOSS community rely on features of social structure to describe and account for some of the advantages of FLOSS production. To address this question, we examined 120 project teams from SourceForge, representing a wide range of FLOSS project types, for their communications centralization as revealed in the interactions in the bug tracking system. We found that FLOSS development teams vary widely in their communications centralization, from projects completely centered on one developer to projects that are highly decentralized and exhibit a distributed pattern of conversation between developers and active users. We suggest, therefore, that it is wrong to assume that FLOSS projects are distinguished by a particular social structure merely because they are FLOSS. Our findings suggest that FLOSS projects might have to work hard to achieve the expected development advantages which have been assumed to flow from "going open." In addition, the variation in communications structure across projects means that communications centralization is useful for comparisons between FLOSS teams. We found that larger FLOSS teams tend to have more decentralized communication patterns, a finding that suggests interesting avenues for further research examining, for example, the relationship between communications structure and code modularity.

The power of social structure: how we became an intelligent lineage

2010 ◽  
Vol 10 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Marina Resendes de Sousa António ◽  
Dirk Schulze-Makuch
Keyword(s):  
Social Behavior ◽  
Social Structure ◽  
New World ◽  
Social Systems ◽  
Great Apes ◽  
Male Competition ◽  
Advanced Technology ◽  
Social Stability ◽  
New Findings ◽  
The Social

AbstractNew findings pertinent to the human lineage origin (Ardipithecus ramidus) prompt a new analysis of the extrapolation of the social behavior of our closest relatives, the great apes, into human ‘natural social behavior’. With the new findings it becomes clear that human ancestors had very divergent social arrangements from the ones we observe today in our closest genetic relatives.The social structure of chimpanzees and gorillas is characterized by male competition. Aggression and the instigation of fear are common place. The morphology of A. ramidus points in the direction of a social system characterized by female-choice instead of male–male competition. This system tends to be characterized by reduced aggression levels, leading to more stable arrangements. It is postulated here that the social stability with accompanying group cohesion propitiated by this setting is favorable to the investment in more complex behaviors, the development of innovative approaches to solve familiar problems, an increase in exploratory behavior, and eventually higher intelligence and the use of sophisticated tools and technology.The concentration of research efforts into the study of social animals with similar social systems (e.g., New World social monkeys (Callitrichidae), social canids (Canidae) and social rodents (Rodentia)) are likely to provide new insights into the understanding of what factors determined our evolution into an intelligent species capable of advanced technology.

scholarly journals THE ANTINOMIES OF HABERMAS'RECONSTRUCTION OF HISTORICAL MATERIALISM

2019 ◽  
Vol 2 (24) ◽  
pp. 17-50
Author(s):  
Craig Browne
Keyword(s):  
Social Relations ◽  
Historical Perspective ◽  
Social Evolution ◽  
Sociological Theory ◽  
Social Systems ◽  
Historical Materialism ◽  
Social Identities ◽  
Material Production ◽  
The Social ◽  
Historical Institution

There are few attempts to reformulate the historical perspective of classical sociological theory comparable to that of Jürgen Habermas’ reconstruction of historical materialism. Habermas considered historical materialism to be principally a theory of social evolution and he sought to revise its conception of historical development. In Habermas’ opinion, the logic of the development of normative structures, social identities and cultural understandings differs from that of material production and the organizational complexity of social systems. My analysis reveals how the major innovation of Habermas’ reconstruction of historical materialism is the ensuing conceptualizations of the social relations of production as forms of social integration and the function of systematically distorted communication in their historical institution. Despite the significant implications of this supplementation of the paradigm of production with a theory of communication, Habermas’ reconstruction of historical materialism is shown to be limited by its inflexible logic of development and disengagement from the conflicts internal to processes of material production. It is proposed that the historical perspective of other strands of contemporary social theory may rectify these limitations through their concern with social creativity, institutional variations and the dialectics of social struggle.

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