Solitary Behavior Research Articles

Stepping into their shoes: Reducing the actor-observer discrepancy in judgments of infidelity through the experimental manipulation of perspective-taking

ABSTRACTThe goal of the current study was to examine whether perspective-taking could be an effective method for reducing the actor-observer bias seen in judgments of infidelity. Specifically, 708 adults judged the extent to which 32 behaviors were indicative of infidelity after being assigned to one of nine conditions in which the person engaging in infidelity (actor, partner, stranger) and the perspective-taking instructions (perspective-taking, stay objective, no instructions) were manipulated. Overall, the actor-observer and perspective-taking manipulations significantly affected judgments of the technology/online and solitary forms of infidelity. Adults in the perspective-taking condition judged their partner’s and a stranger’s technology/online behaviors as less indicative of infidelity than their own and their partner’s solitary behaviors as more indicative of infidelity than their own or a stranger’s. These results indicate that perspective-taking impacts infidelity judgments but only for certain behaviors. Implications and recommendations are outlined for clinicians and researchers working with and studying romantic couples.

The Frequency of Solitary Behaviors in Captive Odontocetesis Modulated by Environmental and Social Factors

The number of welfare-oriented studies is increasing in animals under human care, including odontocetes. However, validated welfare indicators are lacking for captive odontocetes. We studied the effect of several conditions (moment of the day, social grouping, public presence) and stimuli (enrichment, perturbations) on the solitary behaviour of Yangtze finless porpoises (Neophocaena asiaeorientalis asiaeorientalis), East-Asian finless porpoises (N. a. sunameri) and bottlenose dolphins (Tursiops truncatus). The frequency of solitary play increased in the three groups in positive conditions and decreased in negative contexts, which confirms that play is a useful indicator of welfare for captive odontocetes. Jumping seem to be indicative of stress for finless porpoises but could be ambiguous for bottlenose dolphins: indicating both positive and negative excitation. Stereotypical behaviours for Yangtze finless porpoises and environment hitting behaviours for bottlenose dolphins could indicate mild stress or frustration. Vigilant behaviours are not clear indicators since a high frequency could reflect boredom, but a low frequency was observed in poor social conditions. Finally, we suggest that environmental rubbing should be investigated further since our results for this behaviour were not clear.

The Reproductive Biology and Embryology of Quinca mirifica, an Apogonid with Direct Development That Produces Non-Functional Oocytes

Quinca mirificaMees, 1966 is a relatively large cardinalfish endemic to western Australia that displays a combination of unusual traits for an apogonid, including solitary behavior, conspicuous ephemeral sexual dichromatism, lack of a dispersing larval period, and production of non-functional oocytes. The ovaries are of cystovarian type and present a germinal ridge running longitudinally along the entire medial face. Ovaries show distinct division in oocyte composition, with a clear division between a rostral section composed of normal oocytes, and a caudal section that is composed of a mass of ∼13,000 non-vitellogenic oocytes of ∼0.2–0.3 mm in diameter, which after hydration, measure ∼0.8–1.0 mm. The egg clutch contains ∼200–250 eggs of ∼3.5 mm in diameter. Egg clutches sometimes break during the transfer, and males retrieve no more than ∼50% of the eggs. Courtship and mating include a “holding behavior” not observed in other apogonids, and the mating process (egg transfer) lasts up to about 90 seconds, the longest observed in any apogonid. Males (orally) incubate the eggs and hatched embryos for about 22–26 days, fasting during this period. Embryos hatch after ∼22 days (8.5 mm SL) and remain in the male's oral cavity for another four days feeding endogenously before being released as juveniles (SL = 9.5 mm). Females became sexually mature at about 10–11 months of age (∼77 mm SL). A study with two females (13 spawns) showed mean frequency of ∼33 days between mating events. Gross anatomy of gonads, embryology, and juvenile development are described.

Solitary wave solutions of (3+1)-dimensional extended Zakharov–Kuznetsov equation by Lie symmetry approach

In this paper, the solitary wave solutions of (3+1)-dimensional extended Zakharov–Kuznetsov (eZK) equation are constructed which appear in the magnetized two-ion-temperature dusty plasma and quantum physics. Lie group of transformation method is proposed to investigate the solution of (3+1)-dimensional eZK equation via Lie symmetry method. The optimal system of one dimensional Lie subalgebra is constructed by using Lie point symmetries. The three dimensional eZK equation reduced into number of ordinary differential equations (ODEs) by applying similarity reductions. Consequently, solutions so extracted are more general than erstwhile known results. We have obtained twenty one solutions in the explicit form, some of them are likewise general and some are new for the best study of us. Eventually, single soliton, quasi-periodic soliton, multisoliton, lump-type soliton, traveling wave and solitary wave-interaction behavior are illustrated graphically through numerical simulation for physical affirmation of the results. Please check whether the affiliations are correct.

Longitudinal Changes in Victimized Youth's Social Anxiety and Solitary Behavior.

This investigation's aims were to assess normative trends in social anxiety and preference for solitude by gender from early childhood to late adolescence and examine the associations among the timing and duration of peer victimization and patterns of continuity or change in social anxiety and preference for solitude across this age period. A sample of 383 children (193 girls) was followed from kindergarten (Mage = 5.50) through grade 12 (Mage = 17.89), and measures of peer victimization, social anxiety, and preference for solitude were repeatedly administered across this epoch. Five victimization trajectory subtypes emerged, capturing individual differences in victimization frequency and continuity (i.e., high-chronic, moderate-emerging, early victims, low victims, and non-victims). Results supported the conclusion that chronic victimization, a key stressor in children's peer environments, plays a different role in the development of social anxiety and preference for solitude. Whereas chronic victimization was associated with the maintenance of social anxiety, it accompanied gains in preference for solitude. The findings provide a more complete account of the overall prevalence, stability, and developmental course of victimized youths' social anxiety and preference for solitude than has been reported to date.

Variation in social systems within Chaetodon butterflyfishes, with special reference to pair bonding.

For many animals, affiliative relationships such as pair bonds form the foundation of society and are highly adaptive. Animal systems amenable for comparatively studying pair bonding are important for identifying underlying biological mechanisms, but mostly exist in mammals. Better establishing fish systems will enable comparison of pair bonding mechanisms across taxonomically distant lineages that may reveal general underlying mechanistic principles. We examined the utility of wild butterflyfishes (f: Chaetodontidae; g: Chaetodon) for comparatively studying pair bonding. Using stochastic character mapping, we provide the first analysis of the evolutionary history of butterflyfish sociality, revealing that pairing is ancestral, with at least seven independent transitions to gregarious grouping and solitary behavior since the late Miocene. We then formally verified social systems in six sympatric and wide-spread species representing a clade with one ancestrally reconstructed transition from paired to solitary grouping at Lizard Island, Australia. In situ observations of the size, selective affiliation and aggression, fidelity, and sex composition of social groups confirmed that Chaetodon baronessa, C. lunulatus, and C. vagabundus are predominantly pair bonding, whereas C. rainfordi, C. plebeius, and C. trifascialis are predominantly solitary. Even in the predominantly pair bonding species, C. lunulatus, a proportion of adults (15%) are solitary. Importantly, inter- and intra-specific differences in social systems do not co-vary with other previously established attributes, including parental care. Hence, the proposed butterflyfish populations are promising for inter- and intra-species comparative analyses of pair bonding and its mechanistic underpinnings. Avenues for further developing the system are proposed, including determining whether the aforementioned utility of these species applies across their geographic disruptions.

Topological analysis of graphoglyptid trace fossils, a study of macrobenthic solitary and collective animal behaviors in the deep-sea environment

AbstractGraphoglyptids are biogenic structures commonly found in deep-sea flysch deposits and occasionally detected on the modern deep-sea floor. They extend principally horizontally and take a variety of geometric patterns, whose functional morphology remains an enigma in ichnology and paleoceanography. Based on published materials from 1850 to 2017 (79 ichnotaxa from 28 ichnogenera of graphoglyptids) and systematic observations of one of the largest deep-sea trace fossil collections in the world, this paper proposes that topological analysis is an important ingredient in the taxonomy and functional interpretation of graphoglyptids. Accordingly, graphoglyptids are classified into line, tree, and net forms by their key topological architecture, and are further attributed to 19 topological prototypes by detailed secondary topological features. Line graphoglyptids are single-connected structures with uniform tunnel width, representing primarily the feeding patterns of solitary animals. Tree graphoglyptids, the most diverse architectural group of graphoglyptids, are ascribed to 11 topological prototypes according to the connectivity features of burrow segments and the number and distributional pattern of the branching points. Net graphoglyptids are subdivided into three topological prototypes on the basis of the connectivity features and/or the regularity of the meshes. Multiconnected net forms are considered as a continuous morphological spectrum with different levels of complexity in the net formation. The various connected components in multiconnected tree and net graphoglyptids generally exhibit small and uniform tunnel diameter in a given structure (suggesting a tiny trace maker[s]). The whole structure shows relatively extensive linear or surface coverage and overall good preservation, indicating sustained processes of burrow construction. It is highly probable that certain multiconnected tree and net graphoglyptids represent some emergent patterns from self-organized collective behaviors of conspecific animals. Graphoglyptids thus provide us with a new perspective on the study of solitary and collective behaviors of macrobenthos in the deep-sea environment.

Limited social plasticity in the socially polymorphic sweat bee Lasioglossum calceatum

Eusociality is characterised by a reproductive division of labour, where some individuals forgo direct reproduction to instead help raise kin. Socially polymorphic sweat bees are ideal models for addressing the mechanisms underlying the transition from solitary living to eusociality, because different individuals in the same species can express either eusocial or solitary behaviour. A key question is whether alternative social phenotypes represent environmentally induced plasticity or predominantly genetic differentiation between populations. In this paper, we focus on the sweat bee Lasioglossum calceatum, in which northern or high-altitude populations are solitary, whereas more southern or low-altitude populations are typically eusocial. To test whether social phenotype responds to local environmental cues, we transplanted adult females from a solitary, northern population, to a southern site where native bees are typically eusocial. Nearly all native nests were eusocial, with foundresses producing small first brood (B1) females that became workers. In contrast, nine out of ten nests initiated by transplanted bees were solitary, producing female offspring that were the same size as the foundress and entered directly into hibernation. Only one of these ten nests became eusocial. Social phenotype was unlikely to be related to temperature experienced by nest foundresses when provisioning B1 offspring, or by B1 emergence time, both previously implicated in social plasticity seen in two other socially polymorphic sweat bees. Our results suggest that social polymorphism in L. calceatum predominantly reflects genetic differentiation between populations, and that plasticity is in the process of being lost by bees in northern populations.Significance statementPhenotypic plasticity is thought to play a key role in the early stages of the transition from solitary to eusocial behaviour, but may then be lost if environmental conditions become less variable. Socially polymorphic sweat bees exhibit either solitary or eusocial behaviour in different geographic populations, depending on the length of the nesting season. We tested for plasticity in the socially polymorphic sweat bee Lasioglossum calceatum by transplanting nest foundresses from a northern, non-eusocial population to a southern, eusocial population. Plasticity would be detected if transplanted bees exhibited eusocial behaviour. We found that while native bees were eusocial, 90% of transplanted bees and their offspring did not exhibit traits associated with eusociality. Environmental variables such as time of offspring emergence or temperatures experienced by foundresses during provisioning could not explain these differences. Our results suggest that the ability of transplanted bees to express eusociality is being lost, and that social polymorphism predominantly reflects genetic differences between populations.

DNA-assisted swarm control in a biomolecular motor system

In nature, swarming behavior has evolved repeatedly among motile organisms because it confers a variety of beneficial emergent properties. These include improved information gathering, protection from predators, and resource utilization. Some organisms, e.g., locusts, switch between solitary and swarm behavior in response to external stimuli. Aspects of swarming behavior have been demonstrated for motile supramolecular systems composed of biomolecular motors and cytoskeletal filaments, where cross-linkers induce large scale organization. The capabilities of such supramolecular systems may be further extended if the swarming behavior can be programmed and controlled. Here, we demonstrate that the swarming of DNA-functionalized microtubules (MTs) propelled by surface-adhered kinesin motors can be programmed and reversibly regulated by DNA signals. Emergent swarm behavior, such as translational and circular motion, can be selected by tuning the MT stiffness. Photoresponsive DNA containing azobenzene groups enables switching between solitary and swarm behavior in response to stimulation with visible or ultraviolet light.

Young children's preference for solitary play: Implications for socio-emotional and school adjustment.

The purpose of this study was to provide additional psychometric support for the Preference for Solitary Play Interview (PSPI) and to examine the associations between self-reported preference for solitary play and indices of adjustment in early childhood. Participants were N=340 children attending kindergarten and grade 1. Children completed the PSPI, and teachers provided assessments of children's socio-emotional and school adjustment. In support of the validity of the PSPI, preference for solitary play was positively associated with asocial behaviours. Further, preference for solitary play displayed an indirect (but not direct) association with peer exclusion via asocial behaviours. Findings are discussed in terms of the social and behavioural implications of preference for solitary play in early childhood. Statement of contribution What is already known on this subject? Children who spend more time alone are at increased risk of adjustment difficulties. However, some individuals desire to spend time alone because of an appreciation for solitude. A preference for solitude is not associated with negative adjustment in adults and older youth. What does this study add? This study is among the first to examine self-reported preference for solitary in early childhood. Preference for solitude may not be related to emotional or school difficulties in young children. However, a heightened display of solitary behaviours may still evoke negative responses from peers.

Nursing Period, Behavior Development, and Growth Pattern of a Newborn Formosan Pangolin (Manis pentadactyla pentadactyla) in the Wild

The Formosan pangolin mainly inhabits the lowland forest in Taiwan. Biological information on pangolins is limited due to their solitary behavior. This study reports the first field record of the behavior development and growth pattern of a newborn male Formosan pangolin during the entire nursing period in the wild. The methods used in this study were radio-tagging and camera-trapping. Data collection for this study was conducted from November 2014 until May 2015. The nursing period was 157 days. The infant started to exit the nursing burrow alone at 11 weeks old, with significant soil scraping and licking behaviors. The duration and distance of the exploring were both extended considerably after 15 weeks old. All exploring behaviors that were recorded occurred after the mother had left the burrow. The total body length of the infant pangolin growth was at a relative constant rate of 1.2 cm/week during the nursing period, which was faster than the only record from a hand-reared individual (0.7 cm/week). This study presents a useful method to monitor the maternal behaviors and infant growth pattern for the Formosan pangolin under natural conditions.

The effects of a buddy bench on elementary students solitary behavior during recess

Social skill instruction and school-wide positive behavior support have been found to be effective in treating students with emotional and behavioral disorders. However, students with internalizing behavior are often overlooked for interventions that could improve academic outcomes and prevent problems that might have serious implications, including social withdrawal, social isolation, and suicidal ideation. In this study, a multiple baseline across participants design was used across two elementary school recess playgrounds to evaluate a “buddy bench” intervention, which utilized peers to help socially withdrawn students to decrease social isolation behavior. Students in Grades 1 to 6 were observed during recess. Results revealed that from baseline to intervention phases the number of students engaged in solitary recess behavior decreased between 19% and 24%. Most students reported positive attitudes towards the intervention, while teachers were more neutral.

Erratum to: Behavioral and genetic mechanisms of social evolution: insights from incipiently and facultatively social bees

Facultatively social species exhibit behavioral plasticity in response to changes in ecological conditions and social environment, and thus provide a natural experiment to compare solitary and social behaviors in a single genome. Such species can therefore provide empirical insights into the evolution of eusociality. The small carpenter bees (genus Ceratina) and sweat bees (Halictidae) are of special interest because they exhibit rich behavioral plasticity. Species range from solitary to eusocial, and both groups benefit from detailed behavioral research and well-established phylogenies. As such, small carpenter and sweat bees are poised to further comparative sociogenomic studies which emphasize the necessity of a molecular phylogeny for understanding the evolution of molecular architecture underlying social phenotypes and organizational complexity. Here, we review behavioral, transcriptomic and genomic data in bees across the social spectrum, highlighting the importance of simple societies and facultatively social taxa to examine the genetic basis of cooperative traits and social evolution.

Doubly excited pulse waves on thin liquid films flowing down an inclined plane: An experimental and numerical study.

The interaction patterns between doubly excited pulse waves on thin liquid films flowing down an inclined plane are studied both experimentally and numerically. The effect of varying the film flow rate, interpulse interval, and substrate inclination angle on the pulse interaction patterns is examined. Our results show that different interaction patterns exist for these binary pulses, which include solitary wave behavior, partial or complete pulse coalescence, and pulse noncoalescence. A regime map of these patterns is plotted for each inclination angle examined, parametrized by the film Reynolds number and interpulse interval. Finally, the individual effect of the system parameters mentioned above on the coalescence distance of binary pulses in the "complete pulse coalescence" mode is studied; the results are compared to numerical simulations of the two-dimensional Navier-Stokes equations yielding good agreement.

Behavioral and genetic mechanisms of social evolution: insights from incipiently and facultatively social bees

Facultatively social species exhibit behavioral plasticity in response to changes in ecological conditions and social environment, and thus provide a natural experiment to compare solitary and social behaviors in a single genome. Such species can therefore provide empirical insights into the evolution of eusociality. The small carpenter bees (genus Ceratina) and sweat bees (Halictidae) are of special interest because they exhibit rich behavioral plasticity. Species range from solitary to eusocial, and both groups benefit from detailed behavioral research and well-established phylogenies. As such, small carpenter and sweat bees are poised to further comparative sociogenomic studies which emphasize the necessity of a molecular phylogeny for understanding the evolution of molecular architecture underlying social phenotypes and organizational complexity. Here, we review behavioral, transcriptomic and genomic data in bees across the social spectrum, highlighting the importance of simple societies and facultatively social taxa to examine the genetic basis of cooperative traits and social evolution.

Comparison of social behavior responses of Japanese medaka (Oryzias latipes) to lethal and sublethal chlorpyrifos concentrations at different exposure times

Chlorpyrifos (CPF) is one of the most widely used insecticides and has been found in both urban and rural water bodies. In this study, we studied variations in the social behavioral patterns, swimming behavior, and brain acetylcholinesterase (AChE) activity of Japanese medaka exposed to lethal (0.12mg/L) and sublethal (0.012mg/L) concentrations of CPF after different exposure times. Group behavior performance (schooling, shoaling, and solitary) was determined on day 4 of lethal exposure and on days 4, 8, and 12 of sublethal exposure. Swimming speed and brain AChE activity were measured on days 4, 8, 12, 16, and 20 of sublethal CPF exposure. We observed significant decreases in social behavior and swimming speed (i.e., hypoactivity) in fish exposed to lethal CPF concentrations for 4 days. At the sublethal concentration, there was increased schooling duration and hyperactivity of fish on day 8 but not on day 4. In contrast, 12 days of sublethal CPF exposure resulted in social behavior responses similar to those after 4 days’ lethal exposure, i.e., significant decreases in schooling frequency and duration with a notable increase in duration of solitary behavior. Brain AChE activity was inhibited in a time-dependent manner. Altered fish behavior in response to organophosphorus pesticides such as CPF may be mediated by more than AChE inhibition alone.

Thousands of Solitary Runners Come Together: Individualism and Communitarianism in the 1970s Running Boom

Abstract This essay focuses on the long-distance running boom of the 1970s and the ways in which the discourse on the boom reflected and shaped larger sociocultural developments. Specifically, the essay explores the paradoxical impulses that the running boom engendered between encouraging more solitary and individualistic behavior on the part of some who trained alone and sought deeper introspection, while simultaneously catalyzing a greater communitarian ethic among other runners in the form of running clubs and mass-participatory races. Scholars have long debated the extent to which Americans in the 1970s embraced individualism or communitarianism. A close examination of the long-distance-running community reveals that runners (and arguably Americans as a whole) did not fully embrace individualism or communitarianism to the exclusion of the other. Rather, the balance between those two seemingly contradictorily impulses became the point of contestation and negotiation within the running community and inside each individual runner.

What Do Medical Students Do for Self-Care? A Student-Centered Approach to Well-Being

ABSTRACTPhenomenon: Despite the promotion of medical student health and wellness through recent program and curricular changes, research continues to show that medical education is associated with decreased well-being in medical students. Although many institutions have sought to more effectively assess and improve self-care in medical students, no self-care initiatives have been designed using the explicit perspectives of students themselves. Approach: Using concept mapping methodology, the research team created a student-generated taxonomy of self-care behaviors taken from a national sample of medical students in response to a brainstorming prompt. The research team examined how students’ conceptualizations of self-care may be organized into a framework suitable for use in programming and curricular change in medical education. Findings: Ten clusters of self-care activities were identified: nourishment, hygiene, intellectual and creative health, physical activity, spiritual care, balance and relaxation, time for loved ones, big picture goals, pleasure and outside activities, and hobbies. Using results of the two-dimensional scaling analysis, students’ individual self-care behaviors were organized within two orthogonal dimensions of self-care activities. Insights: This concept map of student-identified self-care activities provides a starting point for better understanding and ultimately improving medical student self-care. Students’ brainstormed responses fit within a framework of varying levels of social engagement and physical-psychological health that included a wide range of solitary, social, physical, and mental health behaviors. As students’ preferred self-care practices did not often include programmatic activities, medical educators may benefit from consulting this map as they plan new approaches to student self-care and in counseling individual students searching for more effective ways to ease the burdens of medical school.

Proposals for Paraphilic Disorders in the International Classification of Diseases and Related Health Problems, Eleventh Revision (ICD-11)

The World Health Organization is currently developing the 11th revision of the International Classifications of Diseases and Related Health Problems (ICD-11), with approval of the ICD-11 by the World Health Assembly anticipated in 2018. The Working Group on the Classification of Sexual Disorders and Sexual Health (WGSDSH) was created and charged with reviewing and making recommendations for categories related to sexuality that are contained in the chapter of Mental and Behavioural Disorders in ICD-10 (World Health Organization 1992a). Among these categories was the ICD-10 grouping F65, Disorders of sexual preference, which describes conditions now widely referred to as Paraphilic Disorders. This article reviews the evidence base, rationale, and recommendations for the proposed revisions in this area for ICD-11 and compares them with DSM-5. The WGSDSH recommended that the grouping, Disorders of sexual preference, be renamed to Paraphilic Disorders and be limited to disorders that involve sexual arousal patterns that focus on non-consenting others or are associated with substantial distress or direct risk of injury or death. Consistent with this framework, the WGSDSH also recommended that the ICD-10 categories of Fetishism, Fetishistic Transvestism, and Sadomasochism be removed from the classification and new categories of Coercive Sexual Sadism Disorder, Frotteuristic Disorder, Other Paraphilic Disorder Involving Non-Consenting Individuals, and Other Paraphilic Disorder Involving Solitary Behaviour or Consenting Individuals be added. The WGSDSH’s proposals for Paraphilic Disorders in ICD-11 are based on the WHO’s role as a global public health agency and the ICD’s function as a public health reporting tool.

Molecular Evolution of Insect Sociality: An Eco-Evo-Devo Perspective.

The evolution of eusociality is a perennial issue in evolutionary biology, and genomic advances have fueled steadily growing interest in the genetic changes underlying social evolution. Along with a recent flurry of research on comparative and evolutionary genomics in different eusocial insect groups (bees, ants, wasps, and termites), several mechanistic explanations have emerged to describe the molecular evolution of eusociality from solitary behavior. These include solitary physiological ground plans, genetic toolkits of deeply conserved genes, evolutionary changes in protein-coding genes, cis regulation, and the structure of gene networks, epigenetics, and novel genes. Despite this proliferation of ideas, there has been little synthesis, even though these ideas are not mutually exclusive and may in fact be complementary. We review available data on molecular evolution of insect sociality and highlight key biotic and abiotic factors influencing social insect genomes. We then suggest both phylogenetic and ecological evolutionary developmental biology (eco-evo-devo) perspectives for a more synthetic view of molecular evolution in insect societies.