Lifting the veil: richness measurements fail to detect systematic biodiversity change over three decades

While there is widespread recognition of human involvement in biodiversity loss globally, at smaller spatial extents, the effects are less clear. One reason is that local effects are obscured by the use of summary biodiversity variables, such as species richness, that provide only limited insight into complex biodiversity change. Here, we use 30 yr of invertebrate data from a metacommunity of 10 streams in Wales, UK, combined with regional surveys, to examine temporal changes in multiple biodiversity measures at local, metacommunity, and regional scales. There was no change in taxonomic or functional a-diversity and spatial b-diversity metrics at any scale over the 30-yr time series, suggesting a relative stasis in the system and no evidence for on-going homogenization. However, temporal changes in mean species composition were evident. Two independent approaches to estimate species niche breadth showed that compositional changes were associated with a systematic decline in mean community specialization. Estimates of species-specific local extinction and immigration probabilities suggested that this decline was linked to lower recolonization rates of specialists, rather than greater local extinction rates. Our results reveal the need for caution in implying stasis from patterns in a-diversity and spatial b-diversity measures that might mask non-random biodiversity changes over time. We also show how different but complementary approaches to estimate niche breadth and functional distinctness of species can reveal long-term trends in community homogenization likely to be important to conservation and ecosystem function

Reconstruction of primary vertices at the ATLAS experiment in Run 1 proton–proton collisions at the LHC

This paper presents the method and performance of primary vertex reconstruction in proton–proton collision data recorded by the ATLAS experiment during Run 1 of the LHC. The studies presented focus on data taken during 2012 at a centre-of-mass energy of √s=8 TeV. The performance has been measured as a function of the number of interactions per bunch crossing over a wide range, from one to seventy. The measurement of the position and size of the luminous region and its use as a constraint to improve the primary vertex resolution are discussed. A longitudinal vertex position resolution of about 30μm is achieved for events with high multiplicity of reconstructed tracks. The transverse position resolution is better than 20μm and is dominated by the precision on the size of the luminous region. An analytical model is proposed to describe the primary vertex reconstruction efficiency as a function of the number of interactions per bunch crossing and of the longitudinal size of the luminous region. Agreement between the data and the predictions of this model is better than 3% up to seventy interactions per bunch crossing

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

"Butterflies in a jar": How girls and young women conceptualise wellbeing in conflict-affected Myanmar

Since the 2021 coup in Myanmar, the country has been driven into further social, political and economic turmoil. The United Nations estimates that 18.6 million people need humanitarian support. Among those most affected are adolescent girls aged 10–19 years who, as adolescents and young women, face unique risks to their health and wellbeing and require tailored interventions to promote their health and wellbeing both now and in the future. Supporting adolescent girls and young women during conflict means addressing their increased risk of gender-based violence, forced marriage, disrupted education, and access to health services. There is limited evidence on the effects of Myanmar's current political situation on adolescent girls and young women, and even less on what can be done to support their health and wellbeing during this period of protracted instability. In this qualitative study, we used the capabilities approach to conceptualise wellbeing from the perspectives of adolescent girls and young women in Myanmar. Collaborating with four young female peer-researchers, we conducted 12 participatory focus group discussions with 73 girls from Yangon, Sagaing and Mandalay. Our findings identified key themes of wellbeing that were prioritised by our study population: education, agency, hope and happiness, which were being undermined by gender inequality and the ongoing conflict. This study highlights the benefits of the capabilities approach in identifying the complex wellbeing needs of adolescent girls and young women in crisis settings as a basis for programme design and implementation

Deglacial diatom productivity and surface ocean properties over the Bermuda Rise, northeast Sargasso Sea

Author Posting. © American Geophysical Union, 2009. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 24 (2009): PA4101, doi:10.1029/2008PA001729.Diatom assemblages document surface hydrographic changes over the Bermuda Rise. Between 19.2 and 14.5 ka, subtropical diatom species and Chaetoceros resting spores dominate the flora, as in North Atlantic productive regions today. From 16.9 to 14.6 ka, brackish and fresh water diatoms are common and their contribution is generally coupled with total diatom abundance. This same interval also contains rare grains of ice-rafted debris. Coupling between those proxies suggests that successive discharge of icebergs might have stimulated productivity during Heinrich event 1 (H1). Iceberg migration to the subtropics likely created an isolated environment involving turbulent mixing, upwelled water, and nutrient-rich meltwater, supporting diatom productivity in an otherwise oligotrophic setting. In addition, the occurrence of mode water eddies likely brought silica-rich waters of Southern Ocean origin to the euphotic zone. The persistence of lower-salinity surface water beyond the last ice rafting suggests continued injection of fresh water by cold-core rings and advection around the subtropical gyre. These results indicate that opal productivity may have biased estimates of meridional overturning based on 231Pa/230Th ratios in Bermuda Rise sediments during H1.Support for this research was provided by the Fundação para a Ciência e Tecnologia through the grant BPD/27214/2006 to I. M. Gil

Conflict, caregiver violence and gendered parenting: A cross-sectional study among adolescent girls and young women participating in a girls' empowerment programme in Myanmar.

Across Myanmar, armed conflict and political instability have exacerbated poverty, food insecurity, and disrupted essential social protection services, severely affected people's health and wellbeing. This is especially pertinent for girls and young women, for whom gender inequalities are exacerbated during conflict, increasing their risk of various forms of violence. We aimed to measure the prevalence of parent/caregiver-perpetrated violence against adolescent girls across Myanmar and examine its association with exposure to conflict and gendered parenting practices following the 2021 military coup. We included 731 adolescent girls aged 10-17 years enrolled in a girls' empowerment programme, recruited from Mandalay, Yangon and Tanintharyi Regions, Shan State and Kachin State. We co-developed a cross-sectional survey tool with a team of peer-researchers, conducting it between September 2023 and January 2024. Measures included physical and psychological violence, exposure to conflict-related stressors and gendered parenting practices. Logistic regression analyses tested associations between key variables. 80.6% of participants reported psychological violence and 49.8% reported physical violence in the past year. Participants reporting 3 + conflict-related stressors were more likely to report physical violence (aOR=2.19, 95%CI = 1.24-3.89, p = 0.007), participants reporting 1-2 stressors were more likely to report psychological violence (aOR=2.04, 95%CI = 1.09-3.77, p = 0.025). Higher gendered parenting scores were associated with physical (aOR=1.06, 95% CI = 1.03-1.09, p < 0.001) and psychological violence (aOR=1.07, 95%CI = 1.03-1.10, p < 0.001). Conflict may exacerbate gendered parenting and is associated with more parent/caregiver-perpetrated violence. These findings highlight the need for interventions addressing adolescent girls' unique health and wellbeing needs in conflict-settings

Conflict exposure and mental health: a survey of adolescent girls and young women in Myanmar post the 2021 coup d’état

Following the 2021 military coup in Myanmar, adolescent girls and young women have faced a multitude of threats to their health and wellbeing. Beyond direct exposure to armed combat, injuries and loss of life, they are also experiencing displacement, family separation, and restricted access to education and healthcare. These challenges are further compounded by military-imposed restrictions on humanitarian aid and access to the country. This study sought to address a critical gap in understanding how exposure to conflict in Myanmar is impacting adolescent girls’ mental health. Methods: We conducted a survey, co-developed with peer-researchers, with 750 girls and young women aged 10 to 21 years from disproportionately disadvantaged communities across Myanmar. The survey included questions on participants’ demographics, their exposure to conflict-related stressors and their self-reported depressive symptoms. Results: Participants reported widespread exposure to traumatic conflict-related stressors and high levels of depressive symptoms. There was a significant positive association between the number of different conflict-related stressors experienced by the study participants and the number of depressive symptoms reported. Additionally, participants who were living away from their parents reported significantly higher levels of depressive symptoms, emphasising the psychological implications of family separation during conflict. Conclusions: Our results highlight the urgent need for tailored interventions for adolescents, particularly girls and young women, who are exposed to armed conflict. In contexts of protracted instability and uncertainty, such as in Myanmar, interventions should explore ways to foster a sense of social safety, especially among adolescent girls who are displaced or living away from their families. Strengthening social safety systems may help to reduce the adverse mental health impacts of conflict-related stressors

Opportunities, barriers, and recommendations in down syndrome research

Recent advances in medical care have increased life expectancy and improved the quality of life for people with Down syndrome (DS). These advances are the result of both pre-clinical and clinical research but much about DS is still poorly understood. In 2020, the NIH announced their plan to update their DS research plan and requested input from the scientific and advocacy community. The National Down Syndrome Society (NDSS) and the LuMind IDSC Foundation worked together with scientific and medical experts to develop recommendations for the NIH research plan. NDSS and LuMind IDSC assembled over 50 experts across multiple disciplines and organized them in eleven working groups focused on specific issues for people with DS. This review article summarizes the research gaps and recommendations that have the potential to improve the health and quality of life for people with DS within the next decade. This review highlights many of the scientific gaps that exist in DS research. Based on these gaps, a multidisciplinary group of DS experts has made recommendations to advance DS research. This paper may also aid policymakers and the DS community to build a comprehensive national DS research strategy