Organochlorine Pesticides in the Ferruginous Pygmy Owl (Glaucidium brasilianum) in Chiapas, Mexico.

Concentrations of organochlorine pesticides were quantified in samples of feathers (n = 17) and blood (n = 15) of the ferruginous pygmy owl (Glaucidium brasilianum). The individuals were captured near the Protected Natural Area Cerro Sonsonate, Chiapas, Mexico, between February and June 2014. In both tissues, pesticides belonging to seven organochlorine chemical families were detected. However, the organochlorine pesticide concentrations differed between feathers and blood. The highest concentrations of hexachlorocyclohexanes were found in feathers (0.63 ± 0.89 µg/g), whereas the highest concentrations of ΣDrines were found in blood (0.31 ± 0.47 µg/mL). By using the summed concentrations for each of the seven families of pesticides found in feathers, we did not find any significant correlation between the pesticides and pectoral muscle or body weight (p > 0.15). The ΣDDT group was the only pesticide family that showed a positive correlation with owl body weight (r = 0.60, p = 0.05); the concentrations of these pesticides were also high in feather and blood tissues (r = 0.87, p = 0.02). Our results confirm that ferruginous pygmy owls in the study area are exposed to these pesticides.

Peer victimization at school and associated factors in Campeche, Mexico / Victimización por pares en la escuela y factores asociados en Campeche, México

Abstract Objectives: to estimate the prevalence ofpeer victimization (VI-P) and to identify factors associated to it. Methods: a cross sectional study based on a state-representativesample; 2555 students from primary and secondary schools of Campeche, in the academic year 2015-2016 participated. They were interviewed face to face. VI-P was analyzed by sex, age and various school-related aspects with prevalence rate and 95% confidence interval. The analysis of interactions among the studied factors was carried out using a hierarchical log-lineal model. With the significant terms,a multiviarite analysis using a logistic model was performed. Based on this model, maximum and minimum predictive values for VI-P were calculated by odds inverse transformation. Results: the global prevalence of VI-P was 60.4% (CI95%= 58.6-62.3). The prevalence of violence physical, psycho-emotional, patrimonial, and sexual, were 28.8, 52.9, 26.5, and 8.7%, respectively. Students in the first year, who were male, had classes scheduled in the evening, attended a public school and resided in a municipality of high/highest margination index, had the highest probability (75.3%) of suffering VI-P. Conclusions: given the high levels of VI-P found, and its possible effects, it is necessary implement truly effective measures to prevent it.

Resumen Objetivos: estimar la prevalencia de la victimización por pares (VI-P) e identificar factores asociados. Métodos: se realizó un estudio transversal en una muestra representativa de las escuelas del estado de Campeche; se entrevistaron 2555 estudiantes de primaria y secundaria del ciclo escolar 2015-2016. Los alumnos fueron entrevistados cara a cara. Se analizó la tasa de prevalencia de VI-P según sexo, edad y varios aspectos relacionados con la escuela, con un intervalo de confianza de 95%. Las interacciones entre los factores estudiados se analizaron mediante un modelo jerárquico log-linear saturado. A partir de los términos que resultaron significativos, se realizó un análisis multivariado mediante un modelo logístico. Con base en este modelo, se calcularon los valores predictivos máximo y mínimo para la VI-P mediante la transformación inversa de probabilidades. Resultados: la prevalencia global de VI-P fue 60.4% (CI95%= 58.6-62.3). Las prevalencias de violencia física, psicoemocional, patrimonial y sexual fueron: 28.8, 52.9, 26.5 y 8.7%, respectivamente. Los estudiantes de primer grado, hombres, del turno vespertino, que asisten a una escuela pública, y de municipios con alto/muy alto índice de marginación, tuvieron la mayor prevalencia de VI-P (75.3%). Conclusiones: dados los altos niveles de VI-P encontrados, y considerando sus posibles efectos, es necesario implementar medidas realmente efectivas para prevenir este tipo de violencia.