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The shift from outcrossing to selfing is often accompanied by striking changes in floral morphology towards a "selfing syndrome", which is characterized by flowers with reduction in size, pollen: ovule (P/O) ratio, and herkogamy. This study aims to test whether such changes have occurred in the North American Arabidopsis lyrata, which is of particular interest because of the relatively recent transitions to selfing in this system. Flower size, flower shape, herkogamy levels, P/O ratio, and floral integration of six self-incompatible (outcrossing) and six self-compatible (selfing) populations of A. lyrata were measured in a common environment using conventional and geometric morphometrics methods. Although selfers had on average 9.2% smaller corollas, 8.4% longer pistils, and 21.5% lower P/O ratios than outcrossers, there were no differences in shape, floral integration, and herkogamy between outcrossing and selfing populations. Moreover, most variation in floral traits was explained by population genetic background rather than by mating system. We conclude that selfing populations in A. lyrata have not evolved a selfing syndrome.

IntroductionThe transition from cross-fertilisation (outcrossing) to self-fertilisation (selfing) frequently coincides with changes towards a floral morphology that optimises self-pollination, the selfing syndrome. Population genetic studies have reported the existence of both outcrossing and selfing populations in Arabis alpina (Brassicaceae), which is an emerging model species for studying the molecular basis of perenniality and local adaptation. It is unknown whether its selfing populations have evolved a selfing syndrome.MethodsUsing macro-photography, microscopy and automated cell counting, we compared floral syndromes (size, herkogamy, pollen and ovule numbers) between three outcrossing populations from the Apuan Alps and three selfing populations from the Western and Central Alps (Maritime Alps and Dolomites). In addition, we genotyped the plants for 12 microsatellite loci to confirm previous measures of diversity and inbreeding coefficients based on allozymes, and performed Bayesian clustering.Results and DiscussionPlants from the three selfing populations had markedly smaller flowers, less herkogamy and lower pollen production than plants from the three outcrossing populations, whereas pistil length and ovule number have remained constant. Compared to allozymes, microsatellite variation was higher, but revealed similar patterns of low diversity and high Fis in selfing populations. Bayesian clustering revealed two clusters. The first cluster contained the three outcrossing populations from the Apuan Alps, the second contained the three selfing populations from the Maritime Alps and Dolomites.ConclusionWe conclude that in comparison to three outcrossing populations, three populations with high selfing rates are characterised by a flower morphology that is closer to the selfing syndrome. The presence of outcrossing and selfing floral syndromes within a single species will facilitate unravelling the genetic basis of the selfing syndrome, and addressing which selective forces drive its evolution.

Objective: Individuals who return from armed groups present with a history of traumatic events including perpetration. Subsequent severe mental stress and heightened levels of reactive and appetitive aggression may persist and if left untreated, frequently impede peacebuilding and societal stability. In this study, we tested a revised adaptation of Narrative Exposure Therapy (NET;Schauer et al., 2011) for Forensic Offender Rehabilitation (FORNET) implemented in a sample of male former combatants in war-torn regions of the DR Congo. Method: We applied a longitudinal parallel-group randomized controlled design with treatment as usual (TAU) as control condition and 3-5 and 6-9 months follow-up assessments. The effect of treatment over time on clinical and social outcomes was tested with GLMMs; appetitive aggression and current violent behavior (CVB) were specified as primary and posttraumatic stress as secondary outcomes. Results: FORNET decreased appetitive aggression (within group Cohen's d z = 2.00), CVB (d z = .90) and posttraumatic stress (d z = 1.48) significantly more than treatment as usual. Clinical significance was obtained for all outcomes. Remarkably, NET clients also reduced their substance abuse (d z = .68) even though this was not targeted within the intervention. Depression, perceived social acknowledgement and subjective solidarity with (para)military life decreased. Conclusion: FORNET is a compact and scalable psychotherapeutic intervention that effectively reduces current aggressive behavior including physical abuse against children, intimate partner violence (IPV), and community violence. FORNET further decreases appetitive aggression, posttraumatic stress symptoms, and other clinical and social problems that commonly hinder demobilization, reintegration, and postconflict peacebuilding. Public Health Significance StatementThis study shows that Narrative Exposure Therapy (NET) adapted to the needs of former adult combatants and child soldiers (Narrative Exposure Therapy for Forensic Offender Rehabilitation [FORNET]) is not only an effective treatment for posttraumatic stress disorder, but also for current violent behavior (CVB) against children, intimate partners, and the community. It also helps to regulate aggression. The treatment proved effective for the reduction of substance involvement and other ClinicalTrials.gov Identifier: NCT02992561.

Gender differences (GD) in mental health have come under renewed scrutiny during the COVID-19 pandemic. While rapidly emerging evidence indicates a deterioration of mental health in general, it remains unknown whether the pandemic will have an impact on GD in mental health. To this end, we investigate the association of the pandemic and its countermeasures affecting everyday life, labor, and households with changes in GD in aggression, anxiety, depression, and the somatic symptom burden. We analyze cross-sectional data from 10,979 individuals who live in Germany and who responded to the online survey “Life with Corona” between October 1, 2020 and February 28, 2021. We estimate interaction effects from generalized linear models. The analyses reveal no pre-existing GD in aggression but exposure to COVID-19 and COVID-19 countermeasures is associated with sharper increases in aggression in men than in women. GD in anxiety decreased among participants with children in the household (with men becoming more anxious). We also observe pre-existing and increasing GD with regards to the severity of depression, with women presenting a larger increase in symptoms during the hard lockdown or with increasing stringency. In contrast to anxiety, GD in depression increased among participants who lived without children (women > men), but decreased for individuals who lived with children; here, men converged to the levels of depression presented by women. Finally, GD in somatic symptoms decreased during the hard lockdown (but not with higher stringency), with men showing a sharper increase in symptoms, especially when they lived with children or alone. Taken together, the findings indicate an increase in GD in mental health as the pandemic unfolded in Germany, with rising female vulnerability to depression and increasing male aggression. The combination of these two trends further suggests a worrying mental health situation for singles and families. Our results have important policy implications for the German health system and public health policy. This public health challenge requires addressing the rising burden of pandemic-related mental health challenges and the distribution of this burden between women and men, within families and for individuals who live alone.