PrEP Uptake and Methamphetamine Use Patterns in a 4-Year U.S. National Prospective Cohort Study of Sexual and Gender Minority People, 2017-2022.

Methamphetamine use is on the rise among sexual and gender minority people who have sex with men (SGMSM), escalating their HIV risk. Despite pre-exposure prophylaxis (PrEP) being an effective biomedical HIV prevention tool, its uptake in relation to methamphetamine use patterns in SGMSM has not been studied. In a U.S. cohort study from 2017 to 2022, 6,253 HIV-negative SGMSM indicated for but not using PrEP were followed for four years. Methamphetamine use was categorized (i.e., newly initiated, persistently used, never used, used but quit), and PrEP uptake assessed using generalized estimating equation (GEE), adjusted for attrition. Participants had a median age of 29, with 51.9% White, 11.1% Black, 24.5% Latinx, and 12.5% other races/ethnicities. Over the four years, PrEP use increased from 16.3 to 27.2%. GEE models identified risk factors including housing instability and food insecurity. In contrast, older age, health insurance, clinical indications, and prior PrEP use increased uptake. Notably, Latinx participants were more likely to use PrEP than Whites. Regarding methamphetamine use, those who newly initiated it were more likely to use PrEP compared to non-users. However, those who quit methamphetamine and those who persistently used it had PrEP usage rates comparable to those of non-users. Though PrEP uptake increased, it remained low in SGMSM. Methamphetamine use was associated with PrEP uptake. Healthcare providers should assess methamphetamine use for harm reduction. Prioritizing younger, uninsured SGMSM and addressing basic needs can enhance PrEP uptake and reduce HIV vulnerabilities.

Lessons from the invasion front: Integration of research and management of the lionfish invasion in Brazil.

After successful invasions in the Caribbean and Mediterranean, lionfish (Pterois spp.) have recently invaded another important biogeographical region -the Brazilian Province. In this article, we discuss this new invasion, focusing on a roadmap for urgent mitigation of the problem, as well as focused research and management strategies. The invasion in Brazil is already in the consolidation stage, with 352 individuals recorded so far (2020-2023) along 2766 km of coastline. This includes both juveniles and adults, including egg-bearing females, ranging in length from 9.1 to 38.5 cm. Until now, most of the records in the Brazilian coast occurred in the equatorial southwestern Atlantic (99%), mainly on the Amazon mesophotic reefs (15% of the records), northeastern coast of Brazil (45%), and the Fernando de Noronha Archipelago (41%; an UNESCO World Heritage Site with high endemism rate). These records cover a broad depth range (1-110 m depth), twelve protected areas, eight Brazilian states (Amapá, Pará, Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, and Pernambuco) and multiple habitats (i.e., mangrove estuaries, shallow-water and mesophotic reefs, seagrass beds, artificial reefs, and sandbanks), indicating a rapid and successful invasion process in Brazilian waters. In addition, the lack of local knowledge of rare and/or cryptic native species that are potentially vulnerable to lionfish predation raises concerns regarding the potential overlooked ecological impacts. Thus, we call for an urgent integrated approach with multiple stakeholders and solution-based ecological research, real-time inventories, update of environmental and fishery legislation, participatory monitoring supported by citizen science, and a national and unified plan aimed at decreasing the impact of lionfish invasion. The experience acquired by understanding the invasion process in the Caribbean and Mediterranean will help to establish and prioritize goals for Brazil.

Transgender Individuals and Digital Health.

PURPOSE OF REVIEW: The goal of this review is to assess the use of digital technologies to promote the health and well-being of transgender and gender diverse (TGD) people. RECENT FINDINGS: TGD individuals experience numerous health disparities, including low uptake of HIV prevention strategies, such as pre-exposure prophylaxis, increased HIV incidence, and suboptimal HIV-related outcomes. These health disparities are the result of widespread intersectional stigma on the basis of gender identity, gender expression, socioeconomic class, race, and ethnicity, which negatively impact access to general medical and transgender-specific health care. TGD individuals often delay or avoid essential medical services due to fear of discrimination. Clinicians frequently lack training, competence, and skills in transgender medicine, further exacerbating the health disparities faced by TGD people. Digital technologies have been used to improve research and clinical care for TGD populations through various modalities; telemedicine, telehealth and mHealth. Digital health technologies, including HIT-enabled clinical decision support, telehealth, telemedicine, and mHealth, offer innovative ways to improve health care access, improve quality of care, and reduce health disparities for TGD populations, including and beyond HIV outcomes, through enhanced care delivery, clinician education, and enhancing social support networks.

Predictors of Event-Driven Regimen Choice in Current PrEP Users and Sexual Behavior Characteristics of MSM Receiving Sexual Health Services in New York City.

While daily PrEP is undeniably effective, broad-based adoption remains low. Non-daily PrEP modalities, like event-driven PrEP (ED PrEP), offer an efficient way to deliver PrEP's protection to priority populations. We carried out an at-home survey with patients receiving sexual health services in a LGBTQ-clinic in New York (n = 147). Participants answered questions on ED PrEP awareness and preferences, sexual behavior, and sexual preparatory practices. Only 50% of our sample were aware of ED PrEP, about 30% met eligibility for ED PrEP, and 35% chose ED PrEP as a good HIV prevention option for them. In a robust Poisson model (n = 128), endorsement of ED PrEP as a good prevention choice was significantly more common in participants who were uninsured, preferred taking PrEP only when needed, and those who had concerns about side-effects. Furthermore, participants reported many sexual behaviors patterns and preparatory practices compatible with use of ED PrEP.

RESUMEN: Si bien la PrEP diaria es innegablemente efectiva, la adopción generalizada sigue siendo baja. Las modalidades de PrEP no diarias, como la PrEP impulsada por eventos (ED PrEP), ofrecen una manera eficiente de brindar protección de PrEP a las poblaciones prioritarias. Realizamos una encuesta a domicilio con pacientes que recibían servicios de salud sexual en una clínica LGBTQ en Nueva York (n = 147). Los participantes respondieron preguntas sobre su conocimiento y sus preferencias de la ED PrEP, su comportamiento sexual, y sus prácticas de preparación sexual. Solo el 50% de nuestra muestra conocía la ED PrEP, alrededor del 30% cumplía con los requisitos para la ED PrEP, y el 35% eligió ED PrEP como una buena opción de prevención del HIV para ellos. En un modelo robusto de Poisson (n = 128), la aprobación de la ED PrEP como una buena opción de prevención fue significativamente más común en los participantes que no tenían seguro, preferían tomar la PrEP solo cuando era necesario, y aquellos que tenían preocupaciones sobre los efectos secundarios. Además, los participantes informaron muchos patrones de comportamiento sexual y prácticas preparatorias compatibles con el uso de ED PrEP.

Awareness and Acceptability of Undetectable = Untransmittable Among a U.S. National Sample of HIV-Negative Sexual and Gender Minorities.

While the "Undetectable = Untransmittable" (U=U) message is widely endorsed, little is known about its breadth and reach. Our study describes socio-demographic characteristics and sexual behaviors associated with having heard of and trusting in U =U in a U.S. national sample of HIV-negative participants. Data were derived from the Together 5,000 cohort study, an internet-based U.S. national cohort of cis men, trans men and trans women who have sex with men. Approximately 6 months after enrollment, participants completed an optional survey included in the present cross-sectional analysis (n = 3286). Measures included socio-demographic and healthcare-related characteristics; questions pertaining to knowledge of and trust in U=U (dependable variable). We used descriptive statistics and multivariable logistic models to identify characteristics associated with these variables and explored patterns in willingness to engage in condomless anal sex (CAS) with regard to trust in U=U. In total, 85.5% of participants reported having heard of U=U. Among those aware of U=U, 42.3% indicated they trusted it, 19.8% did not, and 38.0% were unsure about it. Latinx, Asian, lower income, and Southern participants were less likely to have heard of U=U. Having had a recent clinical discussion about PrEP or being a former-PrEP user were associated with trust in U=U. Willingness to engage in CAS was positively associated with trust in U=U, and varied based on the partner's serostatus, PrEP use and viral load. Although we found high rates of awareness and low levels of distrust, our study indicated that key communities remain unaware and/or skeptical of U=U.

RESUMEN: Mientras que el mensaje de "Indetectable=Intransmisible" (I=I) es ampliamente respaldado, poco se conoce acerca de su alcance y amplitud. Nuestro estudio describe características socio-demográficas y los comportamientos sexuales asociados con haber escuchado de y confiar en I=I en una muestra nacional Estadounidense de participantes VIH-negativos. Los datos se derivaron de Together 5,000, un estudio cohorte en donde se recopiló datos de un cohorte basado en internet de hombres cis, hombres trans y mujeres trans que tienen sexo con otros hombres. Aproximadamente 6 meses después de la inscripción, los participantes completaron una encuesta opcional cuyos datos son presentados en este análisis transversal (n = 3286). Los instrumentos incluyeron características socio-demografías y relacionadas al cuidado de la salud; preguntas pertinentes al conocimiento de y confianza en I=I (variable dependiente). Usamos estadísticas descriptivas y modelos logísticos multivariables para identificar características asociadas a estas variables y exploramos los patrones en la disposición a participar de sexo anal sin condones (CAS) con respecto a la confianza en I=I. En total, 85.5% de los participantes reportaron haber escuchado de I=I. Entre esos, 42.3% indicó que confiaban en el mensaje, 19.8% no confiaban, y 38.0% estaban inseguros. Los participantes latinx, asiáticos, de bajos recursos y del sur tenían menos probabilidad de haber escuchado de I=I. El haber tenido una discusión clínica reciente sobre PrEP o el ser un ex usuario de PrEP se asociaron con la confianza en I=I. La disposición a participar de CAS se asoció positivamente con la confianza en I=I, y varió en función del estado serológico de las parejas, el uso de PrEP y la carga viral. Aunque encontramos altas tasas de conciencia y bajos niveles de desconfianza, nuestro estudio indicó que comunidades clave siguen sin conocer y/o escépticas de I=I.

Factors Associated with Being PrEP-Naïve Among a U.S. National Cohort of Former-PrEP and PrEP-Naïve Participants Meeting Objective Criteria for PrEP Care.

There is an urgent need to increase uptake and persistence in HIV pre-exposure prophylaxis (PrEP) in PrEP-eligible candidates. Little is known about the similarities and differences between groups of PrEP-naïve and former users, an important consideration for future interventions. We explored factors associated with being PrEP-naïve in a U.S. national cohort of naïve and former-PrEP users, all of whom met objective criteria for PrEP care at enrollment. Data were derived from the Together 5000 cohort study, an Internet-based U.S. national cohort of cisgender and trans men and trans women who have sex with men. Participants were recruited via ads on men-for-men geosocial networking apps. All participants were not on PrEP at the time of enrollment. We conducted bivariate analysis to explore differences between the two groups and used multivariable logistic regression to assess factors associated with being PrEP-naïve. Of the 6283 participants, 5383 (85.7%) were PrEP-naïve and 900 (14.3%) were former-PrEP users. There were significant differences between PrEP-naïve and former-PrEP users across multiple demographic variables, in addition to PrEP-related and psychosocial variables. Factors associated with being PrEP-naïve included younger age, sexual identity other than gay/queer, lower perception of candidacy for PrEP care, less willingness to take PrEP, lower access to PrEP care, and individual-level barriers such as health- and provider-related concerns. Programs and policies designed to address uptake and persistence of PrEP should be aware of these differences. Providing care in non-traditional LGBTQ-care settings, home-based PrEP interventions, and provision by healthcare providers other than physicians could improve uptake. Future research should investigate mechanisms that can improve uptake and persistence in communities in need of PrEP.

Getting Clear About Rectal Douching Among Men Who Have Sex With Men.

Receptive anal sex is the primary means through which HIV is transmitted among men who have sex with men (MSM). Recently, researchers have begun investigating the role that rectal douching may play in amplifying risk for transmission. Yet, there is limited research on the frequency with which MSM douche, the products they use, and how this may vary across sociodemographic characteristics. A U.S. national sample of 4745 MSM completed an online survey that assessed their douching behavior, demographic characteristics, sexual behavior, and their anal sexual positioning (i.e., top, bottom, versatile). Nearly two-thirds (65.8%) had engaged in rectal douching in the last three months. Among those who douched, water was commonly reported (84.2%) and 20.1% reported using commercial enemas (e.g., Fleet), as well as water and soap (15.0%)-numbers exceed 100% as some participants reported more than one. Men who douched reported significantly more receptive and insertive condomless anal sex acts in the prior 3 months. One-in-ten men reported rectal bleeding after douching. Compared to HIV-negative participants who had not taken PrEP, participants had higher odds of reporting douching in the past 3 months if they were HIV-negative and currently on PrEP (AOR = 1.82), HIV-negative and previously used PrEP (AOR = 1.58), and HIV-positive (AOR = 1.83). Douching was common in this sample. Given that douching could amplify risk for HIV transmission, healthcare providers should discuss douching safety with their patients, with a focus on harm reduction (e.g., reduce risk of bleeding, as opposed to abstinence from douching).

Assessment of DNA damage in goat preantral follicles after vitrification of the ovarian cortex.

Effective methods for gamete preservation should have low impact on DNA integrity. The present study investigated the effects of vitrification of goat ovarian tissues on the occurrence of DNA fragmentation and DNA double-stand breaks using the terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labelling (TUNEL) assay and detection of phosphorylated histone H2AX (γH2AX), respectively. Goat ovaries were collected at a local abattoir and 12 tissue fragments were prepared from each ovarian pair. Tissue fragments were used as fresh control samples or were cultured in vitro, vitrified or vitrified and cultured. Vitrification was performed using the Ovarian Tissue Cryosystem. Fragments from all groups (control and treatments) were processed for histology, transmission electron microscopy, TUNEL assay and immunofluorescence. Compared with fresh control samples, a lower percentage of morphologically normal follicles was detected in the vitrification followed by culture treatment group (P<0.05). Normal follicular ultrastructure was observed in all groups. Immunofluorescence revealed the presence of γH2AX foci in few oocytes and ovarian stromal cells. TUNEL-positive follicles were found in samples without significant differences among groups (P>0.05). In conclusion, the vitrification protocol used in the present study did not increase DNA damage in preantral follicles enclosed in goat ovarian tissues.

PrEP Discontinuation In A US National Cohort Of Sexual And Gender Minority Populations, 2017-22.

In the US, sexual and gender minority populations are disproportionately affected by HIV. Pre-exposure prophylaxis (PrEP) is a key prevention method, but its effectiveness relies on consistent usage. Our four-year national cohort study explored PrEP discontinuation among sexual and gender minority people who initiated PrEP. We found a high annual rate of discontinuation (35-40 percent) after PrEP initiation. Multivariable analysis with 6,410 person-years identified housing instability and prior history of PrEP discontinuation as predictors of discontinuation. Conversely, older age, clinical indication for PrEP, and having health insurance were associated with ongoing PrEP use. To promote sustained PrEP use, strategies should focus on supporting those at high risk for discontinuation, such as younger people, those without stable housing or health insurance, and prior PrEP discontinuers.

The impact of chronic and acute problems on sea turtles: The consequences of the oil spill and ingestion of anthropogenic debris on the tropical semi-arid coast of Ceará, Brazil.

Sea turtle mortality is often related to materials that reach the coast from different anthropic activities worldwide. This study aimed to investigate whether sea turtle mortality was related to older marine problems, such as solid waste, or one of the largest oil spill accidents on the Brazilian coast, that occurred in 2019. We posed three questions: 1) Are there solid residues in the digestive tract samples, and which typology is the most abundant? 2) Can meso­ and macro-waste marine pollutants cause mortality? 3) Is the dark material found really oil? A total of 25 gastrointestinal content (GC) samples were obtained, of which 22 ingested waste of anthropogenic origin and 18 were necropsied. These 22 samples were obtained during or after the 2019 oil spill, of which 17 specimens were affected, making it possible to suggest oil ingestion with the cause of death in the animals that could be necropsied. Macroscopic data showed that the most abundant solid waste was plastic (76.05 %), followed by fabrics (12.18 %) and oil-like materials. However, chemical data confirmed only three specimens with oil levels ranging from remnants to high. It was possible to infer possible causes of death in 16 of the total 18 necropsied cases: Most deaths were due to respiratory arrest (62.5 %), followed by pulmonary edema (12.5 %), cachexia syndrome (12.5 %), circulatory shock (6.25 %), and head trauma (6.25 %), which may have been caused by contact with solid waste, oil, or both. The study showed that not all dark material found in the GCs of turtles killed in oiled areas is truly oil, and in this sense, a chemical analysis step to prove the evidence of oil must be added to international protocols.

Changes in Cost and Insurance Challenges to Cover PrEP Between 2019 and 2021.

INTRODUCTION: Pre-Exposure Prophylaxis (PrEP) use continues lag estimated need among gay and bisexual men in the United States. Studies report that challenges paying for PrEP may undermine continued use. Our study aimed to measure these challenges over time. METHODS: Data were taken from a US national cohort study of cisgender gay and bisexual men and transgender individuals aged 16-49 years. We analyzed data from PrEP-using participants between 2019 and 2021 and observed cost-related and insurance-related challenges participants experienced while on PrEP across time points. We report McNemar and Cochrane Q test statistics to compare differences between groups by year(s). RESULTS: In 2019, 16.5% (n = 828/5013) of participants were on PrEP; by 2020, 21% (n = 995/4727) were on PrEP, and by 2021, 24.5% (n = 1133/4617) were on PrEP. The proportion of those experiencing challenges paying for PrEP care decreased significantly across time points for clinical appointments, laboratory work, and prescriptions. Those experiencing insurance and copay approval issues did not change significantly. Although not statistically significant, the only proportion that increased over time was those reporting PrEP-related insurance approval issues. In a post hoc analysis, we found that those reporting PrEP use in the past year who were not currently on PrEP were significantly more likely to report experiencing most PrEP challenges, when compared with current PrEP users. DISCUSSION: We found significant reductions in insurance and cost-related challenges between 2019 and 2021. However, those who discontinued PrEP within the past year reported greater challenges paying for PrEP, suggesting that cost and insurance issues may undermine PrEP persistence.

What Predicts a Clinical Discussion About PrEP? Results From Analysis of a U.S. National Cohort of HIV-Vulnerable Sexual and Gender Minorities.

HIV-outcome inequities remain prevalent in the U.S. Medical providers (MPs) are gatekeepers of PrEP, and understanding the dynamics of PrEP assessments is of major interest for public health. We analyzed data from Together 5000, an internet-based U.S. national cohort of sexual and gender minority (SGM) individuals aged 16-49 years and at risk for HIV. Among those eligible for PrEP uptake (n = 6264), we modeled predictors of discussing PrEP with an MP. A third (31%) of participants had spoken to a MP about PrEP. Among those who spoke to a MP, 45% suggested they would initiate PrEP; this outcome was more common among participants older than 24. With a persistent stagnant uptake nationwide, new opportunities to influence PrEP uptake must be explored. An attractive less targeted space is the medical office, specifically ways to support an initial and continued discussion about PrEP between MPs and their patients.

Interconnected marine habitats form a single continental-scale reef system in South America.

Large gaps in reef distribution may hinder the dispersal of marine organisms, interrupting processes vital to the maintenance of biodiversity. Here we show the presence and location of extensive reef habitats on the continental shelf between the Amazon Reef System (ARS) and the Eastern Brazilian Reef System (ERS), two reef complexes off eastern South America. Formations located 20-50 m deep include both biogenic and geogenic structures. The presence of diverse reef assemblages suggests the widespread occurrence of rocky substrates below 50 m. These habitats represent an expansion of both the ARS and ERS and the closure of the only remaining large-scale gap (~ 1000 km) among West Atlantic reef environments. This indicates that the SW Atlantic harbors a single, yet heterogeneous, reef system that stretches for about 4000 km, and thus, represents one of the largest semi-continuous tropical marine ecosystems in the world.

Why Are Patients Switching from Tenofovir Disoproxil Fumarate/Emtricitabine (Truvada) to Tenofovir Alafenamide/Emtricitabine (Descovy) for Pre-Exposure Prophylaxis?

Safety differences between tenofovir alafenamide/emtricitabine (TAF) and tenofovir disoproxil fumarate/emtricitabine (TDF/FTC)-formulated pre-exposure prophylaxis (PrEP) appear to have little clinical significance for most PrEP users. Furthermore, generic TDF-formulated PrEP is projected to decrease the price of PrEP. Thus, efforts to shift PrEP users to TAF-formulated PrEP should be considered in light of their potential to undermine efforts to scale-up PrEP nationally. Data are taken from Together 5,000, a US national cohort study predominantly composed of cisgender gay and bisexual men. In 2019-2020, 5034 participants completed their 24-month assessment, which measured whether participants were switching from TDF (Truvada) to TAF (Descovy) for PrEP, and why. Of those reporting PrEP-use (n = 1009), 277 reported using Descovy for PrEP, and 223 provided a reason for switching to Descovy. A content analysis was used to code participant's reasons for switching. Over half (56%) of participants reported that their doctor recommended switching to Descovy. Without mentioning a provider recommendation, 32% of participants reported that perceived improved safety of Descovy, compared with Truvada, motivated their decision to change their prescription. Other factors cited included the smaller size of the pill and "newness" of Descovy. Further, several participants mentioned negative advertising about Truvada as rationale for switching. Although scientific consensus supports the safety of both TDF/FTC and TAF, our results suggest that current messaging through physicians and other sources have emphasized superior safety of TAF-implying that TDF/FTC may not be safe in the long term. Efforts to shift users onto TAF may undermine public perception of TDF-formulated PrEP.

Building capacity of community health centers to overcome data challenges with the development of an agile COVID-19 public health registry: a multistate quality improvement effort.

OBJECTIVE: During the coronavirus disease 2019 (COVID-19) pandemic, federally qualified health centers rapidly mobilized to provide SARS-CoV-2 testing, COVID-19 care, and vaccination to populations at increased risk for COVID-19 morbidity and mortality. We describe the development of a reusable public health data analytics system for reuse of clinical data to evaluate the health burden, disparities, and impact of COVID-19 on populations served by health centers. MATERIALS AND METHODS: The Multistate Data Strategy engaged project partners to assess public health readiness and COVID-19 data challenges. An infrastructure for data capture and sharing procedures between health centers and public health agencies was developed to support existing capabilities and data capacities to respond to the pandemic. RESULTS: Between August 2020 and March 2021, project partners evaluated their data capture and sharing capabilities and reported challenges and preliminary data. Major interoperability challenges included poorly aligned federal, state, and local reporting requirements, lack of unique patient identifiers, lack of access to pharmacy, claims and laboratory data, missing data, and proprietary data standards and extraction methods. DISCUSSION: Efforts to access and align project partners' existing health systems data infrastructure in the context of the pandemic highlighted complex interoperability challenges. These challenges remain significant barriers to real-time data analytics and efforts to improve health outcomes and mitigate inequities through data-driven responses. CONCLUSION: The reusable public health data analytics system created in the Multistate Data Strategy can be adapted and scaled for other health center networks to facilitate data aggregation and dashboards for public health, organizational planning, and quality improvement and can inform local, state, and national COVID-19 response efforts.

Recruiting vulnerable populations to participate in HIV prevention research: findings from the Together 5000 cohort study.

PURPOSE: The aim of the article was to examine factors associated with completing enrollment milestones in the Together 5000 cohort of at-risk men (n = 8661), transmen (n = 53), and transwomen (n = 63) who have sex with men. METHODS: Between 2017 and 2018, participants completed an online enrollment survey and were offered opportunities to complete an incentivized secondary online survey as well as self-administered at-home HIV testing (OraSure). We explored factors associated with completing each study component. RESULTS: In total, 8777 individuals completed our enrollment survey, 6166 (70.3%) completed the secondary survey, and 5010 returned the at-home HIV test kit that was mailed to them (81.3% of those mailed a kit). In our multivariable models, those who were White, with more years of education, were more likely to complete study components, although the magnitude of these associations was small. For example, 50.9% of those enrolled, 47.9% of those completing the secondary survey, and 46.8% of those completing HIV testing were persons of color-a statistically significant, but meaningfully insignificant decline. CONCLUSIONS: These findings highlight the need for researchers to identify barriers that may prevent persons of color and younger individuals from participating in research studies.

Space-time patterns and drivers of migrant bird communities in coastal Piauí State, Brazil

Introduction: Migration is a natural phenomenon that includes annual movements of many bird species in response to seasonal cycles. With approximately one third of all living bird species, South America has an important avifauna, and many migrants land in Brazil at stopping points and wintering sites. Objective: To identify associations between migrant birds and coastal vegetation, and environmental influence of on migration. Methods: At 10 points along the coast of Piauí State, Brazil, we made visual censuses and mist net captures, between April 2009 and February 2016. Results: We identified 82 migrant bird species (13 orders; 28 families) that represented 41 intracontinental migrating species, 26 northern visiting species, 14 nomad species and one vagrant species. The richness peaks were at the beginning and end of both dry and rainy seasons, matching insolation and atmospheric pressure. There were spatial pattern differences among vegetation complexes. Chrysolampis mosquitus is an indicator of caatinga vegetation, Numenius phaeopus of wetland, Charadrius collaris of non-flooding fields, Rostrhamus sociabilis of forest-grassland transition, and Columbina picui of orchards. Despite differences in number and species composition within vegetation types, the temporal pattern in species richness was similar among flooded fields, non-flooded fields, and transition grassland categories. Conclusions: Migrant birds occupy specific environments during their permanence along the coast of Piauí State, with richness matching insolation and atmospheric pressure.

Introducción: La migración es un fenómeno natural que incluye los movimientos anuales de muchas especies de aves en respuesta a los ciclos estacionales. Con aproximadamente un tercio de todas las especies de aves conocidas, América del Sur tiene una avifauna importante y muchas aves migratorias tienen puntos de parada e invernada en Brasil. Objetivo: Identificar asociaciones entre las aves migratorias y la vegetación costera, y la influencia del medio ambiente en la migración. Métodos: En 10 puntos a lo largo de la costa del Estado de Piauí, Brasil, realizamos censos visuales y capturas con redes de niebla, entre abril 2009 y febrero 2016. Resultados: Identificamos 82 especies de aves migratorias (13 órdenes; 28 familias) que representaron 41 especies migratorias intracontinentales, 26 especies visitantes del norte, 14 especies nómadas y una especie vagante. Los picos de riqueza se dieron al principio y al final de las estaciones seca y lluviosa, coincidiendo con la insolación y la presión atmosférica. Hubo diferencias en el patrón espacial entre los complejos de vegetación. Chrysolampis mosquitus es un indicador de vegetación de caatinga, Numenius phaeopus de humedales, Charadrius collaris de campos que no se inundan, Rostrhamus sociabilis de transición bosque-pastizales y Columbina picui de huertos. A pesar de las diferencias en el número y composición de especies dentro de los tipos de vegetación, el patrón temporal en la riqueza de especies fue similar entre las categorías de campos inundados, campos no inundados y pastizales de transición. Conclusiones: Las aves migratorias ocupan ambientes específicos durante su permanencia a lo largo de la costa del estado de Piauí, con una riqueza acorde con la insolación y la presión atmosférica.

Synthesis of novel peptide linkers: simultaneous cyclization and labeling.

Synthesis of novel peptide linkers was accomplished by monocarboxylation of 1,3,5-tris(bomomethyl)benzene with a wide variety of carboxylic acids in the presence of diisopropylethylamine. These reagents can be used to simultaneously cyclize and label peptides containing two cysteines. Many labels are compatible with this method including lipids, fluorescent groups, and biotin.