Checklist of hover flies (Diptera, Syrphidae) of the Republic of Georgia.

A checklist of the Syrphidae species of the Republic of Georgia is presented. New hover fly (Diptera: Syrphidae) records from Georgia are provided as a result of field work conducted in 2018. At the same time, published syrphid records for the country are here reviewed and updated. A total of 357 species of hoverflies are now documented from Georgia, 40 of which are reported for the first time. Moreover, DNA barcodes were sequenced for 238 specimens, representing 74 species from this country.

Six new species of Microdon Meigen from Madagascar (Diptera: Syrphidae).

Six new species of the myrmecophilous hoverfly genus Microdon Meigen (Diptera: Syrphidae) are described from Madagascar. Redescriptions are given for the three other Madagascan species of this genus. Keys are presented to the Madagascan genera of the subfamily Microdontinae and to the Madagascan species of Microdon.

'I bet I can do it!' - Reach and effectiveness of a television show about smoking cessation among low, moderate, and high educated smokers.

INTRODUCTION: Smoking is in the Netherlands more prevalent among lower and moderate educated than among higher educated people. The entertainment-education television show 'I bet I can do it!' was specifically designed to stimulate smoking cessation among low and moderate educated smokers. METHODS: The effect of the television show was evaluated with longitudinal data of the International Tobacco Control Policy Evaluation Project. Dutch smokers (n = 1,743) aged 15 years and older filled in a survey before and after the seven episodes of 'I bet I can do it!' in 2008. RESULTS: Low educated (OR = 1,55, p = 0,048) and moderate educated respondents (OR = 1,99, p < 0,001) had seen the television show significantly more often than high educated respondents. The show was not significantly associated with self efficacy, quit intention, and quit success, but it was significantly associated with more quit attempts among moderate educated respondents (OR = 2,36, p < 0,001). CONCLUSION: The reach of 'I bet I can do it!' and the effect on quit attempts was larger among moderate educated smokers. The entertainment-education strategy for smoking cessation television programs should be further refined. This can possible lead to a program that has positive effects on the quit intention, self efficacy, quit attempts and the quit success of low and moderate educated smokers.

Low-frequency songs lose their potency in noisy urban conditions.

Many animal species communicate with their mates through acoustic signals, but this communication seems to become a struggle in urbanized areas because of increasing anthropogenic noise levels. Several bird species have been reported to increase song frequency by which they reduce the masking impact of spectrally overlapping noise. However, it remains unclear whether such behavioral flexibility provides a sufficient solution to noisy urban conditions or whether there are hidden costs. Species may rely on low frequencies to attract and impress females, and the use of high frequencies may, therefore, come at the cost of reduced attractiveness. We studied the potential tradeoff between signal strength and signal detection in a successful urban bird species, the great tit (Parus major). We show that the use of low-frequency songs by males is related to female fertility as well as sexual fidelity. We experimentally show that urban noise conditions impair male-female communication and that signal efficiency depends on song frequency in the presence of noise. Our data reveal a response advantage for high-frequency songs during sexual signaling in noisy conditions, whereas low-frequency songs are likely to be preferred. These data are critical for our understanding of the impact of anthropogenic noise on wild-ranging birds, because they provide evidence for low-frequency songs being linked to reproductive success and to be affected by noise-dependent signal efficiency.

Alcohol portrayal on television affects actual drinking behaviour.

AIMS: Alcohol portrayal in movies and commercials is generally positive and might stimulate young people to drink. We tested experimentally whether portrayal of alcohol images in movies and commercials on television promotes actual drinking. METHODS: In a naturalistic setting (a bar lab), young adult male pairs watched a movie clip for 1 h with two commercial breaks and were allowed to drink non-alcohol and alcoholic beverages. These participants were randomly assigned to one of four conditions varying on the type of movie (many versus few alcohol portrayals) and commercials (alcohol commercials present or not). RESULTS: Participants assigned to the conditions with substantial alcohol exposure in either movies or commercials consume more alcohol than other participants. Those in the condition with alcohol portrayal in movie and commercials drank on average 1.5 glasses more than those in the condition with no alcohol portrayal, within a period of 1 h. CONCLUSIONS: This study-for the first time-shows a causal link between exposure to drinking models and alcohol commercials on acute alcohol consumption.

Alcohol drinking in young adults: the predictive value of personality when peers come around.

This study examined whether personality traits and peer drinking affect alcohol consumption in young adults. Data were analyzed from a study that was conducted in a 'bar laboratory' in which ad-lib drinking of peer groups was observed. The findings indicate that extroversion is moderately associated with self-reported daily drinking, while low emotional stability is modestly associated with alcohol-related problems. With regard to drinking in the observational drinking setting, personality is not associated with young adults' actual alcohol consumption. Further, peer drinking levels were strongly related to young adults' drinking. Besides, agreeableness interacted with the effects of peer drinking on young adults' drinking in such a way that agreeable individuals adapted their actual alcohol consumption more easily than others when socializing in a high- or a low-drinking peer group. We concluded that drinking in a peer context, irrespective of personality, played a major role in forming young adults' drinking. However, personality (i.e. agreeableness) definitely played a role to the extent of the individuals' adaptation to peer drinking norms.

Sociometric status and social drinking: observations of modelling and persuasion in young adult peer groups.

Because young adult drinking occurs primarily in peer groups, this should be taken into account when studying influences on drinking behaviour. This paper aimed to assess influences on drinking by observing existing peer groups in a naturalistic setting. We first analysed the basic levels at which two types of influence take place. The first, modelling (imitating others' drinking), was found to significantly influence individual drinking, whereas for the second one, persuasion (drinking resulting from others offering drinks), no predictions were found. Subsequently, we examined whether peer group members' sociometric status in the group affected the amount of influence and persuasion exerted and received. No indications were found that sociometric status had an impact on influence in alcohol consumption within a drinking situation. Features and weaknesses of the study are discussed.

Pastime in a pub: observations of young adults' activities and alcohol consumption.

Alcohol consumption typically takes place in a time-out situation, which can be spent by engaging in several leisure time activities. Usually, conversation is the dominant pastime in a bar, but this may take place during other activities, like watching TV or playing games. These activities may inhibit drinking because of the physical difficulties of drinking and being active at the same time. Findings of an observational study on drinking in young adults (N=238) in a bar lab will be discussed. In the present study, we followed the ad-lib drinking of peer groups (7-9 persons) during 1-h periods. The results suggest that (1) selection of activities is not related to initial drinking level or personality characteristics; (2) active pastime is related to slower drinking than passive pastime (in males); (3) male problem drinkers appear to compensate for the "lost" amount of drinking after an active phase; and (4) involvement in active pastime is not related to total alcohol consumption. Implications of these findings are discussed.

The effects of alcohol expectancies on drinking behaviour in peer groups: observations in a naturalistic setting.

AIMS: To study the functionality of alcohol expectancies in predicting drinking behaviour in existing peer groups of young adults in a 'naturalistic' setting. DESIGN AND SETTING: Young adults were invited to join an experiment with their peer group in a bar annex laboratory. During a 'break' of 50 minutes in this experiment, their activities, social behaviour and drinking behaviour were observed with digital video and audio equipment. PARTICIPANTS: Twenty-eight peer groups were involved in this study. A peer group consisted of seven to nine people, with relationships ranging from intimate relations and close friendships to being acquaintances. A total of 238 participants were involved. Measurements Information of the drinking behaviour from observations and questionnaire data on alcohol expectancies provide the opportunity to look at how and which expectancies are related to actual drinking patterns. Multiple regression and multi-level analyses were applied. FINDINGS: Expectancies on the positive and arousing effects of alcohol consumption were related to alcohol consumption in a naturalistic, social drinking situation, in addition to group effects of drinking. Expectancies on the negative and sedative effects of drinking, however, were not related to drinking. CONCLUSIONS: The findings indicate that among young adults observed in a peer group and naturalistic drinking setting, positive expectancies about the effects of alcohol and expectancies about the effects of alcohol on arousal are related positively to drinking level.

Friend's drinking behaviour and adolescent alcohol consumption: the moderating role of friendship characteristics.

Friends are presumed to exert a substantial influence on young people's drinking patterns. The current study focused on the effects of the best friend's drinking behaviour on the alcohol consumption of 12-14-year-old adolescents. Furthermore, we hypothesized friendship characteristics (i.e., reciprocity and sociometric status differences) to moderate the extent in which adolescents had been influenced by their best friends. Longitudinal data of 1276 adolescents and their best friends were used to examine whether the adolescent's friend's drinking behaviour, reciprocity of the friendship, and status differences between friends affected the magnitude of change in the adolescent's drinking behaviour. The findings showed that best friend's drinking behaviour is related to adolescent's drinking both cross-sectionally and longitudinally. Cross-sectionally, this association was particularly strong between mutual friends and friends with lower status. In longitudinal analyses, a different picture emerged. Respondents were most likely to adopt their friend's drinking behaviour when it was a unilateral friend with a higher status.

Long-term effects of family functioning and child characteristics on problem drinking in young adulthood.

Several studies have shown that disturbances in the parent-child relationship in childhood are related to patterns of alcohol abuse in adolescence and young adulthood. Recently some researchers, however, argue that whether poor parenting is detrimental depends on specific child characteristics. Hence, instead of examining overall effects of parenting, it might be more appropriate to search for specific child-environment effects that lead to problematic drinking patterns. In this paper, we investigate the interplay between child characteristics (lack of self-control and aggression) and parenting on problematic alcohol use in young adulthood. Data were used from a longitudinal study that followed 301 children and their parents for a period of 10 years. Both parents and their children were interviewed on parenting practices and child characteristics when the child was a young adolescent (mean age of 12 years at time 1) and extensive information on problematic alcohol use was gathered when the participants were young adults (mean age was 22 at time 3). Findings showed strong effects of childhood aggression (men only) and poor family functioning on enhanced levels of problem drinking in young adulthood. Further, the combination of high levels of aggression and low levels of family functioning were related to problem drinking in men, whereas the combination of low parental control and low levels of affection expression were related to problem drinking in women.