The Role of Dimensions of Social Support in the Relationship Between Stigma and Mental Health: A Moderation Analysis.

HIV stigma remains a barrier to good health and understanding how social support may reduce the negative impact of stigma on health may help with designing stigma interventions. This study aims to understand how different types of social support may moderate or change the nature of the relationship between stigma and mental health. We recruited 327 participants to complete the People Living with HIV Stigma Index at baseline (t1) between August 2018 and September 2019 and at follow-up (t2) between February 2021 and October 2021. Separate moderation models were created with different types of social support (emotional/informational, tangible, affectionate, positive social interaction) as moderators, baseline stigma (internalized, enacted, anticipated) as the antecedent, and mental health (t2) as the outcome. Emotional/informational support was a significant moderator for the relationship between enacted (b = -2.12, 95% CI: -3.73, -0.51), internalized (b = -1.72, 95% CI: -3.24, -0.20), and anticipated (b = -2.59, 95% CI: -4.59, -0.60) stigma at t1 and mental health at t2. Tangible support was a significant moderator for internalized stigma (b = -1.54, 95% CI: -2.74, -0.35). Lastly, positive social interaction was a significant moderator for internalized (b = -1.38, 95% CI: -2.71, -0.04) and anticipated stigma (b = -2.14, 95% CI: -3.93, -0.36). In general, the relationship between social support and better mental health was stronger for participants with low stigma. Intervention strategies aimed at both stigma reduction and boosting social supports with different functions may be important for improving the mental health of people living with HIV.

The impact of determinants of health on the relationship between stigma and health in people living with HIV.

Determinants of health are important drivers of health states, yet there is little work examining their role in the relationship between HIV stigma and health. This study uses moderation analysis to examine how determinants of health affect the relationship between enacted, internalized, and anticipated stigma and mental health. Quantitative data was collected on 337 participants in Ontario, Canada at baseline (t1) between August 2018 and September 2019 and at follow-up (t2) between February 2021 and October 2021. Separate moderation models were created with each determinant of health (age, gender, sexual orientation, ethnicity, geographic region, education, employment, and basic needs) acting as the moderator between types of stigma at t1 and mental health at t2. Age was a significant moderator for the relationship between internalized and enacted stigma at t1 and mental health at t2. Region was a moderator for enacted and anticipated stigma and mental health. Sexual orientation was a moderator for anticipated stigma and mental health. Lastly, having basic needs was a moderator for enacted and anticipated stigma and mental health. Our findings suggest that intervention strategies may be more effective by incorporating supports for these determinants of health in addition to stigma reduction to improve mental health.

The cost of anticipating stigma: a longitudinal examination of HIV stigma and health.

Levels of HIV stigma remain high, however there is a limited understanding around how different types of stigma interact to impact health. This study uses data from two time points to examine how enacted and internalized stigma lead to worse health through anticipated stigma as a mediator. We recruited 341 participants in Ontario, Canada to complete the HIV Stigma Index survey at baseline (t1) from September 2018 to August 2019 and follow up (t2) approximately two years later. Mediation models were created with enacted and internalized stigma at t1 as the antecedents, anticipated stigma at t2 as the mediator, and physical health, mental health, and overall health at t2 as the outcomes. Only the model with internalized stigma (t1) as the antecedent had anticipated stigma (t2) as a significant mediator contributing to both decreased mental and overall health. This highlights the need to address internalized stigma and the potential for anticipated stigma interventions to be effective at improving the health and wellbeing of people living with HIV.

Harnessing citizen science in health promotion: perspectives of policy and practice stakeholders in Australia.

Citizen science is rapidly gaining momentum as a means of involving members of the public in research and decision-making in disease prevention and health promotion. However, citizen science projects have predominantly been led by academic researchers and there is limited understanding of how to support the application of citizen science approaches in policy and practice settings. This study aimed to understand the perceptions, motivations and early experiences of applying citizen science approaches in policy and practice settings. Semi-structured interviews were conducted with policy and practice stakeholders who were leading citizen science projects (project partners, n = 7), and their implementation partners (project implementers, n = 11). Participants viewed citizen science as an opportunity to access hard-to-reach data and to enhance engagement with community members to support policy and practice change. Barriers and facilitators of citizen science in policy and practice settings included navigating collaborative relationships, team capacity and resources available to deliver projects, recruitment and engagement of citizen scientists and ethical considerations in the design and implementation of citizen science projects. Findings support the feasibility and wider application of citizen science approaches in health promotion and are being used to inform the development of tools and resources to build capacity in these approaches in policy and practice settings.

Routinized Syphilis Screening Among Men Living With Human Immunodeficiency Virus: A Stepped Wedge Cluster Randomized Controlled Trial.

BACKGROUND: We implemented an opt-out clinic-based intervention pairing syphilis tests with routine human immunodeficiency virus (HIV) viral load testing. The primary objective was to determine the degree to which this intervention increased the detection of early syphilis. METHODS: The Enhanced Syphilis Screening Among HIV-Positive Men (ESSAHM) Trial was a stepped wedge cluster-randomized controlled trial involving 4 urban HIV clinics in Ontario, Canada, from 2015 to 2017. The population was HIV-positive adult males. The intervention was standing orders for syphilis serological testing with viral loads, and control was usual practice. We obtained test results via linkage with the centralized provincial laboratory and defined cases using a standardized clinical worksheet and medical record review. We employed a generalized linear mixed model with a logit link to estimate odds ratios (ORs) and 95% confidence intervals (CIs) of the intervention. RESULTS: A total of 3895 men were followed over 7471 person-years. The mean number of syphilis tests increased from 0.53 to 2.02 tests per person per year. There were 217 new diagnoses of syphilis (control, 81; intervention, 136), for which 147 (68%) were cases of early syphilis (control, 61 [75%]; intervention, 86 [63%]). The annualized proportion with newly detected early syphilis increased from 0.009 to 0.032 with implementation of the intervention; the corresponding time-adjusted OR was 1.25 (95% CI, .71-2.20). CONCLUSIONS: The implementation of standing orders for syphilis testing with HIV viral loads was feasible and increased testing, yet produced less-than-expected increases in case detection compared to past uncontrolled pre-post trials. CLINICAL TRIALS REGISTRATION: NCT02019043.

Anthropogenic habitat alteration leads to rapid loss of adaptive variation and restoration potential in wild salmon populations.

Phenotypic variation is critical for the long-term persistence of species and populations. Anthropogenic activities have caused substantial shifts and reductions in phenotypic variation across diverse taxa, but the underlying mechanism(s) (i.e., phenotypic plasticity and/or genetic evolution) and long-term consequences (e.g., ability to recover phenotypic variation) are unclear. Here we investigate the widespread and dramatic changes in adult migration characteristics of wild Chinook salmon caused by dam construction and other anthropogenic activities. Strikingly, we find an extremely robust association between migration phenotype (i.e., spring-run or fall-run) and a single locus, and that the rapid phenotypic shift observed after a recent dam construction is explained by dramatic allele frequency change at this locus. Furthermore, modeling demonstrates that continued selection against the spring-run phenotype could rapidly lead to complete loss of the spring-run allele, and an empirical analysis of populations that have already lost the spring-run phenotype reveals they are not acting as sustainable reservoirs of the allele. Finally, ancient DNA analysis suggests the spring-run allele was abundant in historical habitat that will soon become accessible through a large-scale restoration (i.e., dam removal) project, but our findings suggest that widespread declines and extirpation of the spring-run phenotype and allele will challenge reestablishment of the spring-run phenotype in this and future restoration projects. These results reveal the mechanisms and consequences of human-induced phenotypic change and highlight the need to conserve and restore critical adaptive variation before the potential for recovery is lost.

Assessing HIV provider knowledge, screening practices, and training needs for HIV-associated neurocognitive disorders. A short report.

Management of HIV-associated neurocognitive disorders (HAND) is becoming increasingly important with HIV-positive people living normal life spans. We aimed to establish the level of HAND awareness among doctor and nurse occupational health practitioners, screening used to detect impairment, factors limiting screening for HAND, and training needs. One-hundred-and-five members of the nursing and physician professional societies for occupational health practitioners in South Africa and Occupational Health Departments at five South African universities responded to an email invitation to complete an online survey addressing demographics, HAND knowledge, screeners being used to screen for HAND and related training needs. While 80% had heard of HAND, few (13.3%) were aware of the Frascati criteria. Only 2% had received training addressing HAND; 11.4% screened for HAND; 45.7% did not know what screening tool to us; 80% preferred spending <15 min on screening. The largest obstacle to screening was lack of expertise (77.1%) but 77.3% thought it important to screen for HAND. 94.3% wanted screening training. Health providers are poorly informed about HAND and lack expertise and tools to screen for HAND in their treatment programs. While few had relevant training, they recognize the importance of screening for HAND in the workplace and desire training.

Reporting on patients living with HIV "disengaging from care". Who is actually "lost to follow-up"?

Retention in care remains an important concern for health care providers. However, accurately identifying who is or is not retained in care can be problematic. Not all patients believed to be engaged in care are actually in care, and not all patients believed to be disengaged are truly disengaged. Identifying the status of individuals within populations is important for clinical, administrative and surveillance concerns. As part of the Linkage and Retention in Care Project at St Michael's Hospital in Toronto, Canada, we investigated the status of patients diagnosed with HIV. Detailed investigation determined who was actually Lost-to-Follow-Up (i.e., disengaged from care >12 months) and who had disengaged for known reasons. This approach determined more precisely who was currently followed in care and who was not, and to target efforts to contact and reengage patients more effectively. This study illustrates the importance of accurately monitoring populations enhancing disease management.

An exploration of the fertility desires and intentions of men living with HIV in Ontario, Canada.

Planning families is an important issue within the HIV community. The primary objective of this study was to explore the fertility desires and intentions of men living with HIV (MLWH). A cross-sectional survey containing 77 questions in 10 domains was developed, validated and administered to MLWH. The sample was stratified by sexual orientation, ethnicity, and city of residence. Logistic regression analyses were conducted to determine sociodemographic correlates of intention to have children. 276 men were recruited, of whom 118 (43%) identified as heterosexual and 158 (57%) as gay, bisexual, two-spirit or queer (GBTQ). 133 (45%) men wished and 120 (44%) actually intended to become a parent. Significantly more heterosexual men desired fatherhood (63% vs 37%, p < .0001) and intended to have children in the future (57% vs. 34%, p < .0001). Among all men, significant predictors of intention to have children were age ≤40, heterosexual orientation, African/Caribbean/Black ethnicity, living in Toronto, higher household income, and being partnered with an HIV-negative individual. When stratified by sexual orientation, younger age remained a significant correlate for both groups. A significant proportion of heterosexual and GBTQ MLWH desire and intend to become a parent. Health care providers and policy makers must support these individuals in their reproductive parenting needs.

Using concept mapping to explore the challenges associated with affording and accessing medications among people living with HIV in Ontario, Canada.

Antiretroviral medications are expensive, and people living with HIV often experience challenges accessing and paying for medication due to various obstacles. We used concept mapping to explore the challenges people living with HIV in Ontario, Canada, face when accessing medication. In brainstorming, 68 participants generated 447 statements in response to the focus prompt "Some people living with HIV have trouble getting and paying for prescription drugs because … ". These were consolidated into 77 statements, which were sorted (n = 30) and rated (n = 32) on importance and commonality. A ten-cluster concept map consisting of individual- and health system-related clusters was generated. Clusters included: (1) Stigma, (2) Medication-Related Issues, (3) Individual Challenges, (4) Basic Needs, (5) Immigration, (6) Coverage, (7) Trillium Drug Program, (8) Access to Services, (9) System-Level Issues and (10) Access to Professional Services. Statements in Coverage and Basic Needs were rated most important and common although there was variability by Ontario residence and drug coverage mechanisms. Strategies to address challenges were generated in Interpretation (n = 25 participants). Given that continuous access to antiretroviral therapy is necessary to fully realize treatment benefits, policies and interventions that address these challenges are needed.

The Ontario Integrated Supervised Injection Services Cohort Study of People Who Inject Drugs in Toronto, Canada (OiSIS-Toronto): Cohort Profile.

The Ontario Integrated Supervised Injection Services cohort in Toronto, Canada (OiSIS-Toronto) is an open prospective cohort of people who inject drugs (PWID). OiSIS-Toronto was established to evaluate the impacts of supervised consumption services (SCS) integrated within three community health agencies on health status and service use. The cohort includes PWID who do and do not use SCS, recruited via self-referral, snowball sampling, and community/street outreach. From 5 November 2018 to 19 March 2020, we enrolled 701 eligible PWID aged 18+ who lived in Toronto. Participants complete interviewer-administered questionnaires at baseline and semi-annually thereafter and are asked to consent to linkages with provincial healthcare administrative databases (90.2% consented; of whom 82.4% were successfully linked) and SCS client databases. At baseline, 86.5% of participants (64.0% cisgender men, median ([IQR] age= 39 [33-49]) had used SCS in the previous 6 months, of whom most (69.7%) used SCS for <75% of their injections. A majority (56.8%) injected daily, and approximately half (48.0%) reported fentanyl as their most frequently injected drug. As of 23 April 2021, 291 (41.5%) participants had returned for follow-up. Administrative and self-report data are being used to (1) evaluate the impact of integrated SCS on healthcare use, uptake of community health agency services, and health outcomes; (2) identify barriers and facilitators to SCS use; and (3) identify potential enhancements to SCS delivery. Nested sub-studies include evaluation of "safer opioid supply" programs and impacts of COVID-19.

Late cognitive outcomes among allogeneic stem cell transplant survivors: follow-up data from a 6-year longitudinal study.

CONTEXT: Survivors of allogeneic hematopoietic stem cell transplantation (alloHCT) may experience cognitive impairment over time post-treatment, but early identification of these individuals is limited. OBJECTIVES: We previously reported a prospective evaluation of cognitive functioning over the first 6 months of alloHCT. Here, we report an extension of this study, with specific aims to (1) evaluate the trajectory of cognitive outcomes over the first 6 years post-alloHCT, and (2) determine the extent to which late cognitive impairment is predicted by earlier impairment. METHODS: Participants completed objective and subjective cognitive measures before alloHCT, and at 100 days, 6 months, and 6 years post-alloHCT. Outcome trajectories were determined using linear mixed effects models. Relationships between early and late cognitive impairment were assessed using logistic regression and receiver operator curves. RESULTS: This analysis is based on longitudinal data from 59 participants, of whom 20 provided data at 6-year follow-up. Longitudinal models revealed an overall stability of cognitive outcomes over time, except for psychomotor efficiency/processing speed performance, which significantly improved (p = .049). However, poor learning/memory and cognitive complaints were persistently observed. At 6 years, 40% of relapse-free survivors met the impairment criteria. Impairment at 100 days was associated with impairment 6 years (OR = 20.00, p = .028) and demonstrated good accuracy in classifying those who were impaired and not impaired at 6 years (AUC = .79; 95% CI = .56-1.00). CONCLUSION: Poor cognitive outcomes among long-term alloHCT survivors are associated with cognitive functioning during the early post-treatment period. Early identification of survivors likely to experience poor cognitive outcomes may be possible, enabling timely intervention to mitigate long-term negative impacts.

An observed, prospective field study to evaluate the performance and acceptance of a blood-based HIV self-test in Canada.

BACKGROUND: Self testing for HIV is a targeted intervention with the potential to increase the access, uptake and frequency of HIV testing and more effectively reach the undiagnosed, especially in priority populations. The objectives of this study were to (1) evaluate the INSTI HIV self-test performance compared with laboratory reference testing, (2) document if intended users can perform the steps to use the HIV self-test device, and (3) document if intended users can successfully interpret contrived positive, negative, and invalid results. Study was intended to be submitted to Health Canada for review for regulatory approval purposes. METHODS: The study used a cross-sectional design and recruited consenting adults who were representative of intended users of HIV self-testing from four community sites across Ontario, Québec, and Manitoba between August 2019 and March 2020. The results of the observed HIV self-test were compared with results of the Abbott Architect HIV Ag/Ab Combo test. Usability outcomes for critical (e.g., lancing finger, blood droplet into bottle, shaking bottle four times) and noncritical self-test procedure steps were also determined. RESULTS: Overall, 77% (n = 522) of participants were between 18 and 45 years of age, 61% (n = 410) were male, 71% (n = 480) had some college or more education, and 45% (n = 307) were employed; identity for race and ethnicity: Caucasian (44%; n = 296), African, Caribbean or Black (17%; n = 113), Indigenous [First Nations, Métis or Inuit] (14%; n = 95), Asian (16%; n = 106), Latin American (7%; n = 46). Primary performance analysis on 678 completed HIV self-tests revealed a positive percent agreement of 100% (5/5, 95% CI: 43.6-97.0%) and a negative percent agreement of 99.5% (614/617, 95% CI: 98.6-99.8%) with the comparator method. The overall percent agreement of results interpretation between participant and observer was 93.5% (n = 633). For the 708 participants who took part in the usability study, the average success rate for steps determined to be "critical" for successful completion of the test was 92.4%. 97% (n = 670) of participants found the instructions easy to follow, and 95% (n = 655) of participants indicated that they would use the test again. Of the 404 participants who interpreted the strong positive, weak positive, negative, and invalid contrived results, successful interpretation ranged from 90.6% (for weak positive, n = 366) to 99.3% (for negative, n = 401). CONCLUSIONS: The addition of a regulatory-approved self-test into the Canadian HIV testing landscape could significantly increase HIV testing rates. Having a blood-based HIV self-test approved in Canada can offer an accurate, acceptable, and simple alternative to facility-based HIV testing, particularly when impacted by Coronavirus pandemic restrictions.

Impact of experienced HIV stigma on health is mediated by internalized stigma and depression: results from the people living with HIV stigma index in Ontario.

BACKGROUND: Experiences of HIV stigma remain prevalent across Canada, causing significant stress and negatively affecting the health and wellbeing of people living with HIV. While studies have consistently demonstrated that stigma negatively impacts health, there has been limited research on the mechanisms behind these effects. This study aims to identify which dimensions of stigma have significant relationships with self-rated health and examine the mechanisms by which those types of stigma impact self-rated health. METHODS: We recruited 724 participants to complete the People Living with HIV Stigma Index in Ontario, designed by people living with HIV to measure nuanced changes in stigma and discrimination. The present study utilizes data from externally validated measures of stigma and health risks that were included in the survey. First, we conducted multiple regression analyses to examine which variables had a significant impact on self-rated health. Results from the multiple regression guided the mediation analysis. A parallel mediation model was created with enacted stigma as the antecedent, internalized stigma and depression as the mediators, and self-rated health as the outcome. RESULTS: In the multiple regression analysis, internalized stigma (coefficient = -0.20, p < 0.01) and depression (coefficient = -0.07, p < 0.01) were both significant and independent predictors of health. Mediation analyses demonstrated that the relationship between enacted stigma and self-rated health is mediated in parallel by both internalized stigma [coefficient = -0.08, se = 0.03, 95% CI (-0.14, -0.02)] and depression [coefficient = -0.16, se = 0.03, 95% CI (-0.22, -0.11)]. CONCLUSIONS: We developed a mediation model to explain how HIV-related stigma negatively impacts health. We found that that enacted stigma, or experiences of prejudice or discrimination, can lead to internalized stigma, or internalization of negative thoughts regarding one's HIV status and/or increased depressive symptoms which then may lead to worse overall health. Highlighting the importance of internalized stigma and depression has the potential to shape the development of targeted intervention strategies aimed at reducing the burden of stigma and improving the health and wellbeing of people living with HIV.

Temporal dynamics of migration-linked genetic variation are driven by streamflows and riverscape permeability.

Landscape permeability is often explored spatially, but may also vary temporally. Landscape permeability, including partial barriers, influences migratory animals that move across the landscape. Partial barriers are common in rivers where barrier passage varies with streamflow. We explore the influence of partial barriers on the spatial and temporal distribution of migration-linked genotypes of Oncorhynchus mykiss, a salmonid fish with co-occurring resident and migratory forms, in tributaries to the South Fork Eel River, California, USA, Elder and Fox Creeks. We genotyped >4,000 individuals using RAD-capture and classified individuals as resident, heterozygous or migratory genotypes using life history-associated loci. Across four years of study (2014-2017), the permeability of partial barriers varied across dry and wet years. In Elder Creek, the largest waterfall was passable for adults migrating up-river 4-39 days each year. In this stream, the overall spatial pattern, with fewer migratory genotypes above the waterfall, remained true across dry and wet years (67%-76% of migratory alleles were downstream of the waterfall). We also observed a strong relationship between distance upstream and proportion of migratory alleles. In Fox Creek, the primary barrier is at the mouth, and we found that the migratory allele frequency varied with the annual timing of high flow events. In years when rain events occurred during the peak breeding season, migratory allele frequency was high (60%-68%), but otherwise it was low (30% in two years). We highlight that partial barriers and landscape permeability can be temporally dynamic, and this effect can be observed through changing genotype frequencies in migratory animals.

Wildfire reveals transient changes to individual traits and population responses of a native bumble bee Bombus vosnesenskii.

Fire-induced changes in the abundance and distribution of organisms, especially plants, can alter resource landscapes for mobile consumers driving bottom-up effects on their population sizes, morphologies and reproductive potential. We expect these impacts to be most striking for obligate visitors of plants, like bees and other pollinators, but these impacts can be difficult to interpret due to the limited information provided by forager counts in the absence of survival or fitness proxies. Increased bumble bee worker abundance is often coincident with the pulses of flowers that follow recent fire. However, it is unknown if observed postfire activity is due to underlying population growth or a stable pool of colonies recruiting more foragers to abundant resource patches. This distinction is necessary for determining the net impact of disturbance on bumble bees: are there population-wide responses or do just a few colonies reap the rewards? We estimated colony abundance before and after fire in burned and unburned areas using a genetic mark-recapture framework. We paired colony abundance estimates with measures of body size, counts of queens, and estimates of foraging and dispersal to assess changes in worker size, reproductive output, and landscape-scale movements. Higher floral abundance following fire not only increased forager abundance but also the number of colonies from which those foragers came. Importantly, despite a larger population size, we also observed increased mean worker size. Two years following fire, queen abundance was higher in both burned and unburned sites, potentially due to the dispersal of queens from burned into unburned areas. The effects of fire were transient; within two growing seasons, worker abundance was substantially reduced across the entire sampling area and body sizes were similar between burned and unburned sites. Our results reveal how disturbance can temporarily release populations from resource limitation, boosting the genetic diversity, body size, and reproductive output of populations. Given that the effects of fire on bumble bees acted indirectly through pulsed resource availability, it is likely our results are generalizable to other situations, such as habitat restorations, where resource density is enhanced within the landscape.

On the Ecology and Distribution of Steelhead (Oncorhynchus mykiss) in California's Eel River.

The preservation of life history and other phenotypic complexity is central to the resilience of Pacific salmon stocks. Steelhead (Oncorhynchus mykiss) express a diversity of life-history strategies such as the propensity to migrate (anadromy/residency) and the timing and state of maturation upon return to freshwater (run-timing), providing an opportunity to study adaptive phenotypic complexity. Historically, the Eel River supported upwards of 1 million salmon and steelhead, but the past century has seen dramatic declines of all salmonids in the watershed. Here we investigate life-history variation in Eel River steelhead by using Rapture sequencing, on thousands of individuals, to genotype the region diagnostic for run-timing (GREB1L) and the region strongly associated with residency/anadromy (OMY5) in the Eel River and other locations, as well as determine patterns of overall genetic differentiation. Our results provide insight into many conservation-related issues. For example, we found that distinct segregation between winter and summer-run steelhead correlated with flow-dependent barriers in major forks of the Eel, that summer-run steelhead inhabited the upper Eel prior to construction of an impassable dam, and that both life history and overall genetic diversity have been maintained in the resident trout population above; and we found no evidence of the summer-run allele in the South Fork Eel, indicating that summer run-timing cannot be expected to arise from standing genetic variation in this and other populations that lack the summer-run phenotype. The results presented in this study provide valuable information for designing future restoration and management strategies for O. mykiss in Northern California and beyond.

Hybridization between two parapatric ranid frog species in the northern Sierra Nevada, California, USA.

Contact zones between species provide a unique opportunity to test whether taxa can hybridize or not. Cross-breeding or hybridization between closely related taxa can promote gene flow (introgression) between species, adaptation, or even speciation. Though hybridization events may be short-lived and difficult to detect in the field, genetic data can provide information about the level of introgression between closely related taxa. Hybridization can promote introgression between species, which may be an important evolutionary mechanism for either homogenization (reversing initial divergence between species) or reproductive isolation (potentially leading to speciation). Here, we used thousands of genetic markers from nuclear DNA to detect hybridization between two parapatric frog species (Rana boylii and Rana sierrae) in the Sierra Nevada of California. Based on principal components analysis, admixture, and analysis of heterozygosity at species diagnostic SNPs, we detected two F1 hybrid individuals in the Feather River basin, as well as a weak signal of introgression and gene flow between the frog species compared with frog populations from two other adjacent watersheds. This study provides the first documentation of hybridization and introgression between these two species, which are of conservation concern.

Phylo-comparative analyses reveal the dual role of drift and selection in reproductive character displacement.

When incipient species meet in secondary contact, natural selection can rapidly reduce costly reproductive interactions by directly targeting reproductive traits. This process, called reproductive character displacement (RCD), leaves a characteristic pattern of geographic variation where divergence of traits between species is greater in sympatry than allopatry. However, because other forces can also cause similar patterns, care must be given in separating pattern from process. Here we show how the phylo-comparative method together with genomic data can be used to evaluate evolutionary processes at the population level in closely related species. Using this framework, we test the role of RCD in speciation of two cricket species endemic to Anatolian mountains by quantifying patterns of character displacement, rates of evolution and adaptive divergence. Our results show differing patterns of character displacement between species for reproductive vs. non-reproductive characters and strong patterns of asymmetric divergence. We demonstrate diversification results from rapid divergence of reproductive traits towards multiple optima under the dual influence of strong drift and selection. These results present the first solid evidence for RCD in Anatolian mountains, quantify the amount of drift and selection necessary for RCD to lead to speciation, and demonstrate the utility of phylo-comparative methods for quantifying evolutionary parameters at the population level.

Potential use of supervised injection services among people who inject drugs in a remote and mid-size Canadian setting.

BACKGROUND: While supervised injection services (SIS) feasibility research has been conducted in large urban centres across North America, it is unknown whether these services are acceptable among people who inject drugs (PWID) in remote, mid-size cities. We assessed willingness to use SIS and expected frequency of SIS use among PWID in Thunder Bay, a community in Northwestern, Ontario, Canada, serving people from suburban, rural and remote areas of the region. METHODS: Between June and October 2016, peer research associates administered surveys to PWID. Sociodemographic characteristics, drug use and behavioural patterns associated with willingness to use SIS and expected frequency of SIS use were estimated using bivariable and multivariable logistic regression models. Design preferences and amenities identified as important to provide alongside SIS were assessed descriptively. RESULTS: Among 200 PWID (median age, IQR: 35, 28-43; 43% female), 137 (69%) reported willingness to use SIS. In multivariable analyses, public injecting was positively associated with willingness to use (Adjusted Odds Ratio (AOR): 4.15; 95% confidence interval (CI): 2.08-8.29). Among those willing to use SIS, 87 (64%) said they would always/usually use SIS, while 48 (36%) said they would sometime/occasionally use SIS. In multivariable analyses, being female (AOR: 2.44; 95% CI: 1.06-5.65) and reporting injecting alone was positively associated with higher expected frequency of use (AOR: 2.59; 95% CI: 1.02-6.58). CONCLUSIONS: Our findings suggest that SIS could play a role in addressing the harms of injection drug use in remote and mid-sized settings particularly for those who inject in public, as well as women and those who inject alone, who report higher expected frequency of SIS use. Design preferences of local PWID, in addition to differences according to gender should be taken into consideration to maximize the uptake of SIS, alongside existing health and social service provisions available to PWID.