Domestication‐related variation in social preferences in chickens is affected by genotype on a growth QTL

A growth‐related QTL on chicken chromosome 1 has previously been shown to influence domestication behaviour in chickens. In this study, we used Red Junglefowl (RJF) and White Leghorn (WL) as well as the intercross between them to investigate whether stress affects the way birds allocate their time between familiar and unfamiliar conspecifics in a social preference test (‘social support seeking’), and how this is related to genotype at specific loci within the growth QTL. Red Junglefowl males spent more time with unfamiliar chickens before the stressful event compared to the other birds, whereas all birds except WL males tended to spend less time with unfamiliar ones after stress. A significant QTL locus was found to influence both social preference under undisturbed circumstances and social support seeking. The WL allele at this QTL was associated not only with a preference for unfamiliar individuals but also with a shift towards familiar ones in response to stress (social support seeking). A second, suggestive QTL also affected social support seeking, but in the opposite direction; the WL allele was associated with increased time spent with unfamiliar individuals. The region contains several possible candidate genes, and gene expression analysis of a number of them showed differential expression between RJF and WL of AVPR2 (receptor for vasotocin), and possibly AVPR1a (another vasotocin receptor) and NRCAM (involved in neural development) in the lower frontal lobes of the brains of RJF and WL animals. These three genes continue to be interesting candidates for the observed behavioural effects .     

Effects of breed,sex, and neuter status on trainability in dogs

Abstract

In a previous study of canine temperament (Hsu and Serpell 2003), a distinct “trainability” factor was identified, characterized by a dog's willingness to attend to its owner and obey simple commands, combined with a high “fetch” motivation, and low levels of distractibility and/or resistance to correction. This paper explores the distribution of this trait in a large sample of dogs in relation to breed, sex and neuter status. The owners of 1,563 dogs belonging to 11 common breeds were invited to assess them for “trainability” using a standardized questionnaire (C-BARQ^©). Highly significant breed differences in trainability were detected. In two breeds with distinct field and show bred lines, show bred dogs obtained significantly lower trainability scores. Although no overall sex differences in trainability were detected, male Dachshunds and West Highland White Terriers were found to be significantly more trainable than females. Neutering was not associated with any differences in trainability in female dogs in any breed, but was associated with positive effects on trainability in male Shetland sheepdogs. The findings suggest that there is scope for improving trainability in most breeds of dog, and emphasize the dangers of generalizing among breeds with respect to sex differences in trainability or the benefits of neutering. The biological basis of the trainability trait is also discussed in light of recent research on the evolution of canine social cognition.     

Domestic Dogs as Facilitators in Social Interaction: An Evaluation of Helping and Courtship Behaviors

ABSTRACT

Previous studies have suggested that dogs facilitate social interaction between humans. Furthermore, the nature of social interaction is limited to nonverbal behavior such as smiling or gazing or to commonplace conversations. Four studies were carried out in field settings in order to explore if dogs can facilitate closer relationships. In the first experiment, a male confederate (accompanied or not by a dog) solicited people for money in the street. The second experiment was the same except that a female confederate was used. In a third experiment, a male confederate (with or without a dog) accidentally dropped some coins on the ground, to see if people would help him pick them up. In the fourth experiment, a male confederate (with or without a dog) solicited young women in the street for their phone numbers. Results show that the presence of the dog was associated with a higher rate of helping behavior (experiments 1, 2, 3) and higher compliance with the request of the confederate (experiment 4). The influence of a domestic dog as a facilitator to create affiliation and relations in social interaction is discussed.     

The synchrony effect revisited: chronotype,time of day and cognitive performance in a semantic analogy task

ABSTRACT

The synchrony effect (i.e. superior performance at optimal, inferior performance at suboptimal times of day) has been broadly studied within the context of circadian rhythms. Whether one chronotype copes better with the synchrony effect than the other received only insufficient empirical attention. We report on an applied experimental study investigating the impact of chronotype on the synchrony effect in a semantic analogy task. To detect an analogy, 36 participants (12 males) aged between 18 and 40 had to decide whether the relation between events of a source pair was mirrored by the relation between events of a target pair (e.g. to cook: to eat = to saddle: to ride). Temporal orientation of the relation within each event pair was varied corresponding either to the chronological or reverse order. Response times (RTs), error rates, as well as the psychophysiological parameters pre-experimental pupil baseline and peak pupil dilation replicate findings of a synchrony effect (shorter RTs and allocation of less cognitive resources at optimal times of day) and show an impact of chronotype (morning types generally outperforming evening types). Most importantly, morning types appeared to cope better with the synchrony effect than evening types: At suboptimal times, morning types solved the analogy detection task more efficient; that is faster with the same accuracy and without the investment of more cognitive resources. They also showed greater alertness and wakefulness indexed by greater pre-experimental pupil baselines. At optimal times of day, morning types have more cognitive resources available to allocate these to the more demanding conditions to outperform evening types. We interpret these findings to suggest that morning types are more able to adapt to unfavourable circumstances (for instance, by avoiding wasteful resource allocation when there are less cognitive resources available). Evening types appear less able to adapt to suboptimal times than morning types, because they have to deal with social jetlag and decreased self-control.     

‘We all eat the same bread’: the roots and limits of cosmopolitan bridging ties developed by Romanians in London

This paper investigates the social ties forged by Romanians in London with migrants of different origins in work and non-work contexts to offer a more nuanced view of ‘bridging’ social ties and related discussions of ‘everyday’ cosmopolitanism. Contrary to the overemphasis on ethnic ties seen as a form of bonding in migration research, the paper shows how Romanians bridge informally with many other migrants based on shared ‘non-native’ status. Alongside non-ethnically marked commonalities, ethnicity emerges as an important ingredient of cosmopolitan socialization, yet without necessarily signalling coexisting ethnic identities, as commonly assumed. Romanians' experiences further show that despite providing significant social and cultural capital, bridging ties with migrants, rather than natives, rarely accrue effective resources for social mobility. The findings suggest the need to disaggregate and qualify current understandings of ‘bridging’ social ties usually depicted in positive terms and uniformly as cross-ethnic relationships, or only linked with the ‘mainstream’ population.     

Balancing stigma and status: racial and class identities among middle-class Haitian youth

This article examines the identity formation of middle-class Haitian youth. Segmented assimilation theory predicts that the Haitian second generation will integrate into the black American underclass or maintain strong ethnic group identities. The black middle class, however, is an unexplored pathway of cultural assimilation. This paper uses the literature on the racial and class experiences of the black American middle class as a departure point for understanding the boundary work of middle-class Haitian youth. Based on qualitative interviews and a focus group, we uncover the mechanisms of identity formation for this invisible population. Racial, ethnic and class boundaries compel Haitian youths to create strategies of either empowerment or distancing. They negotiate between their middle-class status and ethnoracial exclusion in a racially segregated neighbourhood, an ethnically homogenous church and a mixed-race school setting. This study's findings extend our theoretical understandings of middle-class immigrants and their identity work.     

Liminality and racial hazing of Muslim migrants: media framing of Albanians in Shepparton,Australia, 1930–1955

This article is a historical empirical study of the Albanian Muslim migrant community of Shepparton. Through analysing newspaper reports, the authors discuss how these migrants were portrayed as liminal between their first arrival and acceptance as Australians a generation later. This is characteristic of a practice which the authors term “migrant hazing”, where a migrant group is demonized as a threat to the society during the liminal phase. Migrant hazing occurs in public discourse, particularly the media, and ceases with the replacement of the group by newer migrants, who are subjected to the same process. Furthermore, migrant hazing remains present in contemporary depictions of Australian Muslims. In this longitudinal study, media reports on Albanian Muslims revolved around three persistent themes: their supposed criminality, the wrongful use of land and the threat of dual-loyalty. These three items constituted the main weapons of the media in hazing the first, liminal generation.     

Saving face: the emotional costs of the Asian immigrant family myth

Access to resources through ethnic group membership is often presumed to affect the intensity of ethnic identification. We examine this premise using survey data on three ethnic groups in Mauritius: Creoles, Hindus, and Muslims. Two key findings emerge from our research. First, access to material resources explains only a modest proportion of total variation in ethnic identification within each group. Second, the resources that affect ethnic identification differ significantly across groups. Access to political goods through group membership affects Hindu identification but is unrelated to ethnic identification among Creoles or Muslims. Conversely, access to economic goods affects Creole and Muslim identification but has no effect on Hindu identification. Explaining these group differences leads us beyond a basic means–ends instrumentalist model to identify conditions that likely mediate the relationship between individual interests and collective identification including the divisibility of economic goods relative to political goods in Mauritius.