Vertebrate Hosts as Islands: Dynamics of Selection, Immigration, Loss, Persistence, and Potential Function of Bacteria on Salamander Skin.

Skin bacterial communities can protect amphibians from a fungal pathogen; however, little is known about how these communities are maintained. We used a neutral model of community ecology to identify bacteria that are maintained on salamanders by selection or by dispersal from a bacterial reservoir (soil) and ecological drift. We found that 75% (9/12) of bacteria that were consistent with positive selection, <1% of bacteria that were consistent with random dispersal and none of the bacteria that were consistent under negative selection had a 97% or greater match to antifungal isolates. Additionally we performed an experiment where salamanders were either provided or denied a bacterial reservoir and estimated immigration and loss (emigration and local extinction) rates of bacteria on salamanders in both treatments. Loss was strongly related to bacterial richness, suggesting competition is important for structuring the community. Bacteria closely related to antifungal isolates were more likely to persist on salamanders with or without a bacterial reservoir, suggesting they had a competitive advantage. Furthermore, over-represented and under-represented operational taxonomic units (OTUs) had similar persistence on salamanders when a bacterial reservoir was present. However, under-represented OTUs were less likely to persist in the absence of a bacterial reservoir, suggesting that the over-represented and under-represented bacteria were selected against or for on salamanders through time. Our findings from the neutral model, migration and persistence analyses show that bacteria that exhibit a high similarity to antifungal isolates persist on salamanders, which likely protect hosts against pathogens and improve fitness. This research is one of the first to apply ecological theory to investigate assembly of host associated-bacterial communities, which can provide insights for probiotic bioaugmentation as a conservation strategy against disease

The Evolution of Ḍād: A Synchronic and Diachronic Analysis of the Emphatic Arabic Ḍād

The purpose of this study is to: (1) examine how the original ḍād consonant and its description evolved from how Sibawayh documented it, and (2) discuss the historical context surrounding the distribution of the ḍād across the Arabic-speaking world. The ḍād is one of the most controversial consonants in the Arabic language, and therefore is a fascinating linguistic phenomenon to study. Almost none of the current dialects resemble the probable original variety introduced when the Arabic language was spread throughout the Middle East and North Africa around the birth of Islam. In the course of this study, the phonetics and phonology of the Arabic emphatic consonant ḍād will be analyzed in detail, as well as the broader history of this emphatic across the Arabic-speaking world. Specifically, the historical context surrounding the development of the consonant will be examined. In addition, ideas about both the contact situation surrounding the consonant and factors that may have influenced its present realization will be explored

A Systematic Review of Criminal Justice Initiatives to Strengthen the Criminal Investigation and Prosecution of Sexual Violence in East Africa.

Sexual violence (SV) is a widespread public health and human rights problem, with countries in East Africa having higher rates than the global average. Prosecutions of SV in East Africa are rare, and survivors face many challenges accessing medico-legal justice and services. Developing initiatives that support survivors in navigating the criminal justice system is vital, yet there is limited research on efforts to improve the criminal justice system's management and treatment of survivors. We conducted a scoping review of research on initiatives to strengthen responses toward investigating and prosecuting cases. We identified 25 academic articles and reports through a search of electronic databases and gray literature that address these initiatives in East Africa. The results reveal that seven types of initiatives have been studied: one-stop centers (OSCs), multisectoral referral networks, gender desks, community interventions, mobile applications, and specialized police and prosecution units. Upon review, we found that barriers to success include a lack of resources and facilities, a lack of trained health care, police, and judicial personnel to perform services, weak medico-legal partnerships, and stigma and impunity restricting the uptake and fair distribution of services. Overall, limited systematic evidence on the effectiveness and adaptability of initiatives exists, showing that SV interventions in East Africa remain an under-researched and under-resourced area, and need greater scientific rigor to inform practice and coordinated advocacy. This review is a call to action for policy makers and service providers working in East Africa-and for international bodies working toward achieving Sustainable Development Goals 5-to improve criminal justice initiatives