Human activities disturb haul out and nursing behavior of Pacific harbor seals at Punta Banda Estuary, Mexico.

Humans frequently interact with Pacific harbor seals (Phoca vitulina richardii) at Punta Banda Estuary, Baja California, Mexico, due to the high incidence of recreational activities people undertake there. The immediate effect of these interactions is that seals flush to the water, reducing their time on land and, probably, increasing their energy expenditure. On-land observations were used to study the impact of different sources of disturbance on seal behavior and evaluate their effect on the amount of time dedicated to nursing over three pupping seasons, (2015-2017), with 0.58-0.81 disturbance events/hour recorded over the entire sampling period. Terrestrial vehicles were the source with the highest disturbance rate (number of disturbance events/h), followed closely by pedestrians. However, the proportion of seals affected was highest when pedestrians were the disturbance source. Recovery events (seals hauling out after flushing) occurred after 34% of disturbance events, after less than half of which the same number of hauled-out seals as there were prior to the disturbance were observed. Recovery time varied among the years studied, of which 2017 saw the longest recovery time. In addition, pedestrians were the disturbance source with the longest recovery time. Given that resting on land is essential for pup survival, which depends on both the establishment of the mother-pup bond from birth and its maintenance throughout nursing, flushing behavior may have significant implications for the entire colony during the nursing season. We recorded a decrease in nursing duration, which did not return to the same level even after recovery and the resumption of nursing. Terrestrial vehicles were found to be the disturbance source that shortened nursing events most significantly.

Características clínicas, demográficas y epidemiológicas de una cohorte de pacientes con síndrome de Takotsubo entre 2011 y 2016 en Medellín, Colombia / Clinical, demographic and epidemiological characteristics of a cohort of patients with Takotsubo's syndrome from 2011 to 2016 in Medellin, Colombia

Resumen Introducción: El síndrome de Takotsubo es una disfunción ventricular aguda de carácter temporal, usualmente reversible, secundaria a eventos estresantes que comprometen el eje cerebro-corazón. Objetivo: describir las características clínicas, epidemiológicas y desenlaces de una cohorte de pacientes con síndrome de Takotsubo en Medellín-Colombia. Materiales y métodos: Estudio observacional, descriptivo, ambispectivo, realizado en una cohorte de pacientes. Se revisaron las historias clínicas de pacientes que ingresaron al servicio de urgencias de una institución de tercer nivel de complejidad de la ciudad de Medellín entre enero de 2011 y diciembre de 2016 con diagnóstico de síndrome de Takotsubo. Se diseñó un cuestionario para recolectar variables demográficas, clínicas, de laboratorio e imagenológicas. Se obtuvieron medidas de frecuencia y análisis estadístico con el programa SPSS versión 21. Resultados: El 66,7% de los pacientes fueron mujeres, la mortalidad fue del 11,1% y la recurrencia del 5,6%. La mayoría de los casos tuvieron un desencadenante conocido (94,5%), siendo la infección el más frecuente (44,4%). El 77,8% de los pacientes presentó disnea al ingreso y el 27,8% requirió uso de algún vasopresor. El promedio de la fracción de eyección del ventrículo izquierdo inicial fue del 34.17+7.8 con evidencia de mejoría en el control, promedio luego del control= 54,81+10.2. Discusión y conclusiones: El síndrome de Takotsubo es una condición infrecuente, las mujeres son la población más afectada y la mayoría de los casos obedece a un factor desencadenante. La mortalidad reportada está dentro de lo esperado y se evidenció un buen pronóstico a mediano plazo. MÉD.UIS. 2020;34(1):27-33.

Abstract Introduction: Takotsubo syndrome is an acute, usually reversible, temporal ventricular dysfunction secondary to stressful events that compromise the brain-heart axis. The study's objective is to describe the clinical, epidemiological characteristics and outcomes of a cohort of patients with Takotsubo syndrome in Medellin-Colombia. Methods: Observational, descriptive, ambispective study performed in a cohort of patients. We reviewed the medical records of patients who entered the emergency department of a third-level complex institution of Medellin between January 2011 and December 2016 with Takotsubo syndrome diagnosis. A questionnaire was designed to collect demographic, clinical, laboratory, and imaging variables. Frequency measures and statistical analyses were obtained with the SPSS version 21 program. Results: 66.7% of the patients were women, mortality was 11.1%, and recurrence was 5.6%. The majority of the cases had a known trigger (94.5%), being the infection the most frequent (44.4%), 77.8% of the patients presented dyspnea on admission, and 27.8% required the use of vasopressor. The mean baseline left ventricular ejection fraction was 34.17 + 7.8 with evidence of improvement in control, average after control = 54.81 + 10.2. Discussion and conclusions: Takotsubo syndrome is an uncommon condition. Women are the most affected population and most cases are due to a secondary cause. The reported mortality is within expectations, and a good medium-term cardiac prognosis was evidenced. MÉD.UIS. 2020;34(1):27-33.

Habitat suitability of cetaceans in the Gulf of Mexico using an ecological niche modeling approach.

BACKGROUND: The Gulf of Mexico (GOM) is a semi-enclosed sea where the waters of the United States, Mexico and Cuba converge. Al least 21 species of cetaceans inhabit it. The only mysticete (baleen whale) is found in the northeast (U.S. waters). The distribution of the 20 species of odontocetes (toothed cetaceans) is well understood in U.S. waters, but practically unknown in Mexican and Cuban waters. In this study we used sighting data from several odontocete species to construct habitat suitability maps in order to identify geographical regions suitable for high diversity throughout the GOM. METHODS: Historical datasets of georeferenced sightings from across the GOM were used to implement the maximum entropy algorithm (MaxEnt) to model the habitat suitability of each species. Five environmental predictors were used, selected for their influence over the occurrence of cetaceans: two oceanographic predictors (sea surface temperature and chlorophyll-a concentration), and three bathymetric predictors (depth, slope, and distance to 200-m isobath). A spatial approach based on the habitat suitability maps was used to identify the suitable regions. RESULTS: Only 12 species were modeled, which were the ones with the minimum sample size required. The models performed well, showing good discriminatory power and slight overfitting. Overall, depth, minimum sea surface temperature, and bottom slope were the most contributing predictor in the models. High suitability areas of 10 species were located on the continental slope, and four suitable regions were identified: (1) the Mississippi Canyon and the Louisiana-Texas slope in the northern GOM, (2) the west Florida slope in the east-northeastern GOM, (3) the Rio Grande slope in the west-northwestern GOM, and (4) the Tamaulipas-Veracruz slope in the west-southwestern GOM. CONCLUSIONS: We were able to detect four geographic regions in the GOM where a high diversity of odontocetes is expected, all located on the continental slope. Although the methodology to identify them (spatial overlap) is a very conservative approach, it is useful for conservation and management purposes. The paucity of data did not allow all species to be modeled, which highlights the importance of establishing transboundary monitoring programs.

Clinical and sociodemographic factors associated with lupus nephritis in Colombian patients: A cross-sectional study.

INTRODUCTION: Over the past decades, incidence of SLE (Systemic Lupus Erythematosus) has increased due to early case detection and improved survival of patients. SLE presents at an earlier age and has a more severe presentation in African-American, Native American, Asian, and Hispanic populations. Worldwide, lupus nephritis (LN) is observed in 29-60% of SLE patients, it has a negative impact in renal survival and patient mortality. Several cohorts have established potential risk factors associated with lupus nephritis, such as male sex, serological markers, and some extra-renal manifestations. OBJECTIVES: To describe sociodemographic, clinical, immunological, and environmental risk factors in Colombian SLE patients and to compare the population with and without nephritis, in order to establish risk factors and possible associations. MATERIALS AND METHODS: A total of 1175 SLE patients participated in this study. During medical care, an interview and structured survey was conducted and later registered in a database. Sociodemographic, clinical, immunological, and environmental exposure variables were analyzed. Bivariate and multivariate analyses were performed using presence of LN as an outcome. RESULTS: Prevalence of LN was 38.7%. Variables significantly associated with LN included being male (OR 1.98), a duration of SLE>10 years (OR 1.48), positive anti-DNA (OR 1.34), positive anti-Sm (OR 1.45), and smoking (OR 1.66). Being non-smoker was a protective factor (OR 0.52). CONCLUSION: This study describes potential factors associated with lupus nephritis in a Latin American population. Smoking status could be a target for intervention as it is a modifiable risk factor. The association between being male and LN is observed in Latin-American populations such as presented here. Further research in other large-scale population studies and more efforts are needed to gain better insights to explicate these relationships.

Climate change and the northern elephant seal (Mirounga angustirostris) population in Baja California, Mexico.

The Earth's climate is warming, especially in the mid- and high latitudes of the Northern Hemisphere. The northern elephant seal (Mirounga angustirostris) breeds and haul-outs on islands and the mainland of Baja California, Mexico, and California, U.S.A. At the beginning of the 21st century, numbers of elephant seals in California are increasing, but the status of Baja California populations is unknown, and some data suggest they may be decreasing. We hypothesize that the elephant seal population of Baja California is experiencing a decline because the animals are not migrating as far south due to warming sea and air temperatures. Here we assessed population trends of the Baja California population, and climate change in the region. The numbers of northern elephant seals in Baja California colonies have been decreasing since the 1990s, and both the surface waters off Baja California and the local air temperatures have warmed during the last three decades. We propose that declining population sizes may be attributable to decreased migration towards the southern portions of the range in response to the observed temperature increases. Further research is needed to confirm our hypothesis; however, if true, it would imply that elephant seal colonies of Baja California and California are not demographically isolated which would pose challenges to environmental and management policies between Mexico and the United States.

Factores, clínicos, sociodemográficos, inmunológicos y exposicionales en Lupus Eritematoso Sistémico asociados a Nefritis Lúpica en población colombiana / Factors, clinical, sociodemographic, immunological and expositional in Systemic Lupus Erythematosus associated with lupus nephritis in Colombian population

Introducción: El lupus eritematoso sistémico (LES) es una enfermedad autoinmune caracterizada por compromiso de múltiples órganos, siendo la nefritis lúpica (NL)1 una de las manifestaciones mas graves. Objetivo: Establecer factores asociados a nefritis lúpica en los pacientes con LES. Métodos: Estudio de corte trasversal tomado de una cohorte de 1175 pacientes con LES que cumplieron criterios clasificatorios para ACR 1997 o SLICC 2012, atendidos en una IPS especializada entre 2007 y 2015. Se realizó análisis bivariado de múltiples características entre pacientes con presencia y ausencia de NL a través de chi2 para variables cuantitativas y U de Mann Whitney para variables politómicas o cuantitativas sin distribución normal en búsqueda de asociación estadística.

Colony-level assessment of Brucella and Leptospira in the Guadalupe fur seal, Isla Guadalupe, Mexico.

The relatively small population size and restricted distribution of the Guadalupe fur seal Arctocephalus townsendi could make it highly vulnerable to infectious diseases. We performed a colony-level assessment in this species of the prevalence and presence of Brucella spp. and Leptospira spp., pathogenic bacteria that have been reported in several pinniped species worldwide. Forty-six serum samples were collected in 2014 from pups at Isla Guadalupe, the only place where the species effectively reproduces. Samples were tested for Brucella using 3 consecutive serological tests, and for Leptospira using the microscopic agglutination test. For each bacterium, a Bayesian approach was used to estimate prevalence to exposure, and an epidemiological model was used to test the null hypothesis that the bacterium was present in the colony. No serum sample tested positive for Brucella, and the statistical analyses concluded that the colony was bacterium-free with a 96.3% confidence level. However, a Brucella surveillance program would be highly recommendable. Twelve samples were positive (titers 1:50) to 1 or more serovars of Leptospira. The prevalence was calculated at 27.1% (95% credible interval: 15.6-40.3%), and the posterior analyses indicated that the colony was not Leptospira-free with a 100% confidence level. Serovars Icterohaemorrhagiae, Canicola, and Bratislava were detected, but only further research can unveil whether they affect the fur seal population.

Senescent phenotype achieved in vitro is indistinguishable, with the exception of Bcl-2 content, from that attained during the in vivo aging process.

Senescent phenotype can be attained by diverse agents, thus suggesting that there might be molecular differences between the senescence achieved in vivo and the senescence-like state attained in vitro under culture conditions. In this study we compare the senescent phenotype reached by cells derived from young animals when cultured in vitro with the one associated with the in vivo aging process. Several in vitro senescence parameters, including MTT reduction, proliferation rate, DNA synthesis, SA-beta-gal staining, and both in vivo and in vitro Bcl-2 content, were determined. Alterations in DNA electrophoretic mobility were evaluated to test differences in bulk chromatin structure. Our results indicate that although it is possible to achieve a senescent phenotype with cells derived from young animals aged in culture, this phenotype differs from the one observed in older animals, due to lack of in vivo damage inducers to which cells are being exposed during natural aging.