Combining multisensor images and social network data to assess the area flooded by a hurricane event.

In this study, multisensor remote sensing datasets were used to characterize the land use and land covers (LULC) flooded by Hurricane Willa which made landfall on October 24, 2018. The landscape characterization was done using an unsupervised K-means algorithm of a cloud-free Sentinel-2 MultiSpectral Instrument (MSI) image, acquired during the dry season before Hurricane Willa. A flood map was derived using the histogram thresholding technique over a Synthetic Aperture Radar (SAR) Sentinel-1 C-band and combined with a flood map derived from a Sentinel-2 MSI image. Both, the Sentinel-1 and Sentinel-2 images were obtained after Willa landfall. While the LULC map reached an accuracy of 92%, validated using data collected during field surveys, the flood map achieved 90% overall accuracy, validated using locations extracted from social network data, that were manually georeferenced. The agriculture class was the dominant land use (about 2,624 km2), followed by deciduous forest (1,591 km2) and sub-perennial forest (1,317 km2). About 1,608 km2 represents the permanent wetlands (mangrove, salt marsh, lagoon and estuaries, and littoral classes), but only 489 km2 of this area belongs to aquatic surfaces (lagoons and estuaries). The flooded area was 1,225 km2, with the agricultural class as the most impacted (735 km2). Our analysis detected the saltmarsh class occupied 541 km2in the LULC map, and around 328 km2 were flooded during Hurricane Willa. Since the water flow receded relatively quickly, obtaining representative imagery to assess the flood event was a challenge. Still, the high overall accuracies obtained in this study allow us to assume that the outputs are reliable and can be used in the implementation of effective strategies for the protection, restoration, and management of wetlands. In addition, they will improve the capacity of local governments and residents of Marismas Nacionales to make informed decisions for the protection of vulnerable areas to the different threats derived from climate change.

Social valuation of the ecosystem services from coastal wetlands: current status and perspectives / Valoración social de los servicios ecosistémicos de humedales costeros: estado actual y perspectivas

RESUMEN Los Servicios Ecosistémicos (SE) son bienes y servicios que la humanidad obtiene de la naturaleza y a los que se asigna valor ecológico, económico y social, aunque se ha brindado menor atención al estudio de este último. Esta deficiencia es más notable en el caso de los humedales costeros, que proveen importantes SE, escasamente explorados desde la perspectiva social y espacial, pese a su pertinencia en la planificación territorial. Para conocer el estado del arte relativo a la valoración social de SE de humedales costeros y la importancia del análisis espacial en el proceso, se realizó una revisión documental sistemática (2005-2018) que permitió observar una tendencia positiva en el número de publicaciones, en especial en el último trienio. Se identificó que el valor social carece de una definición estandarizada y se ha enfocado a servicios sin valor de mercado, mientras que en lo relativo a dimensión espacial, se encontró que se ha venido incorporando con esquemas de mapeo participativo, dirigido a determinar la accesibilidad a sitios de provisión de SE y a la identificación de sitios de valor social dentro de los humedales, sin que la producción de mapas sea relevante. No se encontraron elementos para determinar si la valoración social es complementaria o alternativa a la económica, pero se requiere crear un marco conceptual para la valoración integral basado en la pluralidad de valores de los SE como una estrategia de conservación de los humedales.

ABSTRACT Ecosystem Services (ES) include goods and benefits that people obtain from nature and to which ecological, economic and social values are assigned, although less attention has been given to the study of the latter. This deficiency is particularly notable for coastal wetlands, which provide important ES, rarely studied from a social and spatial perspective, despite their relevance in territorial planning. To define the state-of-the-art about social assessment of SE in coastal wetlands and the importance of spatial analysis in that process, a systematic documentary review (2005-2018) was carried out, finding a positive trend in the number of publications, with a notable increase in the last three years. It was found that social value lacks clear definition and has focused on services without market value, while in terms of spatial dimension it has been included with participatory mapping schemes, aimed at determining the accessibility to SE provision sites and the identification of social value sites within the wetlands, but with a little relevant map production. No elements were found to conclude if social valuation is complementary or alternative to the economic one, but it is necessary to create a conceptual framework for the integral valuation, based on the plurality of values of the SE as a strategy for the conservation of wetlands.

Effects of land use changes on the ecosystem service values of coastal wetlands.

Changes in the coastal landscape of Southern Sinaloa (Mexico), between 2000 and 2010, were analyzed to relate spatial variations in wetlands extent with the provision and economic value of the ecosystem services (ES). Remote sensing techniques applied to Landsat TM imagery were used to evaluate land use/land cover changes while the value transfer method was used to assess the value of ES by land cover category. Five wetland types and other four land covers were found as representative of the coastal landscape. Findings reveal a 14 % decrease in the saltmarsh/forested mangrove area and a 12 % increase in the area of shrimp pond aquaculture (artificial wetland) during the study period. ES valuation shows that the total value flow increased by 9 % from $215 to $233 million (2007 USD) during the 10-year period. This increase is explained as result of the high value worldwide assigned to saltmarsh. We recognize limitations in the transfer-based approach in quantifying and mapping ES values in the region, but this method provides with value estimates spatially defined, and also provides some guidance in the preliminary screening of policies and projected development in the context of data-scarce regions.

Molecular identification of the parasites causing cutaneous leishmaniasis on the Caribbean coast of Colombia.

All clinical manifestations of leishmaniasis exist in Colombia, the cutaneous form being the most frequent in the department of Sucre, where the Leishmania species associated with cutaneous leishmaniasis (CL) is unknown. This study was carried out to determine which Leishmania species was responsible for CL in Sucre, based on amplification and sequencing of the Cyt b gene. Isolates of Leishmania were obtained after CL diagnosis of eight patients who received attention in several health care centers of the study area. The nucleotide sequences obtained from patients were compared to Leishmania reference strains and six of the isolates identified as Leishmania (Viannia) braziliensis, the remaining two being identified as Leishmania (Viannia) panamensis and Leishmania (Viannia) guyanensis. This represents the first report of the presence of L. (V.) guyanensis on the Caribbean coast of Colombia.

Strategies and ethical considerations for the recruitment of young men who have sex with men: challenges of a vaccination trial in Mexico.

BACKGROUND: The importance of recruiting and retaining study participants from minority groups is well recognized; however, there are no established rules for recruitment as its success depends on the setting and population. PURPOSE: To describe and analyze recruitment strategies, ethical considerations, and recruitment outcomes from a study to evaluate the efficacy the Human Papilloma Virus vaccine in young men who have sex with men (MSM). METHODS: The recruitment settings were university and community sites in the state of Morelos, Mexico. Eligibility requirement were men between 18 and 23 years old, who were free of anal-genital lesions as confirmed by clinical exploration, HIV negative, with no history of sexual relations with female partners and with fewer than five male lifetime sexual partners. Recruitment goals were 25 study participants in a four and a half month period. In addition to traditional recruitment strategies (flyers and media advertising, specific training of the recruitment team and adequate choice of recruitment sites)-engagement of local leaders in the MSM community formed a crucial part of the strategy. Special consideration was given to confidentiality and respect for study participants and a Bill of Participant Rights was developed as an explicit commitment to respect and acceptance. RESULTS: In total 723 MSM were initially contacted, 243 filled out the recruitment questionnaire, of which 151 met the criteria to be invited to the clinical examination. After clinical examination and interviews with the recruitment team, 131 fulfilled the inclusion criteria, of whom 73 were enrolled in the study - nearly triple the recruitment goal. Among the initial recruitment strategies (application of the screening questionnaire) attending meetings with MSM activist organizations was the most successful (326), followed by recruitment at bars and dance clubs (107). LIMITATIONS: The recruitment strategies should be formally evaluated for their effectiveness to identify those which are most successful. In addition, future studies should consider the evaluation of study participants' perceptions of the recruitment strategies. CONCLUSIONS: Recruiting MSM in a developing country such as Mexico presented multiple challenges. We recommend that future studies actively engage the local MSM community and pay special attention to designing recruitment strategies that guarantee the confidentiality of and respect for participants.

Assessment of runoff response to landscape changes in the San Pedro subbasin (Nayarit, Mexico) using remote sensing data and GIS.

Results on runoff estimates as a response to land-use and land-cover changes are presented. We used remote sensing and GIS techniques with rainfall time-series data, spatial ancillary information, and the curve-number method (NRCS-CN) to assess the runoff response in the San Pedro subbasin. Thematic maps with eight land-cover classes derived from satellite imagery classification (1973, 1990, and 2000) and hydrologic soil-group maps were used as the input for the runoff calculation. About 20% to 25% of the subbasin landscape has changed since 1973, mainly as consequence of the growth of agriculture. Forest is the main cover, although further analyses indicate that forest is degrading from good to poor conditions when evaluated as a function of the spectral response. Soils with low infiltration rates, classified as the hydrological soil-group "C", were dominant in the area (52%). The overlaying of all the hydrological soil groups with the land-use map produced a total of 43 hydro-group and land-use categories for which runoff was calculated using the curve-number method. Estimates of total runoff volumes (26 x 10(6) m3) were similar for the three dates analyzed in spite of landscape changes, but there were temporal variations among the hydro-group and land-use categories as a consequence. Changes are causing the rise of covers with high runoff potential and the increase of runoff depth is expected, but it can be reversed by different management of subbasin hydro-groups and land-use units.

[Natural infection of Lutzomyia cayennensis cayennensis with trypanosomatid parasites (Kinetoplastida: Trypanosomatidae) in Los Montes de Maria, Colombia]. / Infección natural de Lutzomyia cayennensis cayennensis con parásitos tripanosomatídeos (Kinetoplastida: Trypanosomatidae) en los Montes de Maria, Colombia.

The presence of sand flies naturally infected with trypanosomatid parasites was determined in Los Montes de Maria, Colombia, a region considered endemic for visceral and cutaneous leishmaniasis. Phlebotomines were collected using CDC light-traps, and sticky traps soaked with castor oil placed in the peri and intradomestic habitats. Six species of Lutzomyia were morphologically identified among the 159 sand flies captured: Lu. evansi, Lu. cayennensis cayennensis, Lu. trinidadensis, Lu. atroclavata, Lu. gomezi and Lu. dubitans. A DNA band of 800 pb corresponding to the small-subunit ribosomal RNA gene (ssrRNA) of the family Trypanosomatidae was amplified in one pool of nine females of Lu. cayennensis cayennensis. This finding constitutes the first evidence of natural infection of this sand fly species with trypanosomatid parasites in Los Montes de Maria.

Neumotórax espontáneo en el embarazo: presentación de un caso / Spontaneous pneumothorax in pregnancy: case report

Introducción: el neumotórax espontáneo es poco frecuente durante el embarazo. La causa más común es la ruptura de una bula o burbuja subpleural apical a causa de incremento en la demanda respiratoria durante el periodo periparto. El principal riesgo materno es compromiso respiratorio; los riesgos fetales, reducción en el aporte de oxígeno y trabajo de parto pretérmino. El riesgo de recurrencia es de 30 a 40 %, particularmente durante el trabajo de parto. El tratamiento se basa en la magnitud del neumotórax; hasta 75 % de los casos se trata con pleurostomía cerrada. Caso clínico: mujer de 22 años de edad, segundo embarazo intrauterino, de 24.2 semanas de gestación, sin antecedente de tabaquismo ni otras toxicomanías, sin sintomatología respiratoria ni historia de neumotórax previo. Presentó dolor pleurítico en hemitórax derecho de inicio súbito, transfictivo y pungitivo, acompañado de disnea. A la exploración física, síndrome de rarefacción pulmonar, sin compromiso obstétrico. La radiografía simple de tórax en proyección posteroanterior mostró neumotórax derecho con colapso pulmonar total. Conclusiones: debe considerarse el diagnóstico en casos de dolor torácico y disnea durante el embarazo y trabajo de parto. El caso reseñado se manejó conservadoramente de manera exitosa con drenaje intercostal a mediano plazo, sin recurrencia ni complicaciones.

BACKGROUND: Spontaneous pneumothorax is a rare condition during pregnancy. The most common cause is the rupture of a subpleural apical bulla or bleb, due to the increased respiratory demand of the peripartum period. The main risk for the mother is respiratory compromise; fetal risks include reduction in oxygen supply and preterm labor. The risk of recurrence is 30-40%, particularly during labor. Treatment is based on the magnitude of pneumothorax. Up to 75% of patients are treated with chest tube drainage. We present the case report of a previously healthy patient. CASE REPORT: Our patient was a 22-year-old female at 24.2 weeks of her second pregnancy. The patient was a non-smoker, had no history of any drug addictions, and no history of previous pulmonary disease. The patient presented with sudden onset of pleuritic right-sided pleuritic chest pain associated with dyspnea. Chest examination was notable for decreased breath sounds and hyperresonance over the right hemithorax. Chest radiography showed right spontaneous pneumothorax with total lung collapse. CONCLUSIONS: Diagnosis of pneumothorax should be considered in any pregnant woman with chest pain and dyspnea. The presented case was successfully treated with closed intercostal chest tube thoracostomy for 7 weeks.

[Spontaneous pneumothorax in pregnancy. Case report]. / Neumotórax espontáneo en el embarazo. Presentación de un caso.

BACKGROUND: Spontaneous pneumothorax is a rare condition during pregnancy. The most common cause is the rupture of a subpleural apical bulla or bleb, due to the increased respiratory demand of the peripartum period. The main risk for the mother is respiratory compromise; fetal risks include reduction in oxygen supply and preterm labor. The risk of recurrence is 30-40%, particularly during labor. Treatment is based on the magnitude of pneumothorax. Up to 75% of patients are treated with chest tube drainage. We present the case report of a previously healthy patient. CASE REPORT: Our patient was a 22-year-old female at 24.2 weeks of her second pregnancy. The patient was a non-smoker, had no history of any drug addictions, and no history of previous pulmonary disease. The patient presented with sudden onset of pleuritic right-sided pleuritic chest pain associated with dyspnea. Chest examination was notable for decreased breath sounds and hyperresonance over the right hemithorax. Chest radiography showed right spontaneous pneumothorax with total lung collapse. CONCLUSIONS: Diagnosis of pneumothorax should be considered in any pregnant woman with chest pain and dyspnea. The presented case was successfully treated with closed intercostal chest tube thoracostomy for 7 weeks.

Presentación de un caso de corrección cosmética de pectus excavatum / Cosmetic correction of pectus excavatum: A case presentation

El pectus excavatum representa del 90 al 92% de las deformidades congénitas de la pared anterior del tórax; el resto comprende pectus carinatum, tórax hendido, síndrome de Cantrelly síndrome de Poland. En México, se presenta en 1 de cada 1,000 nacidos vivos. La deformidad es poco evidente al nacimiento; sin embargo, en la infancia se hace más evidente y puede llegar a constituir un problema relevante funcional, psicosocial y/o estético para el adolescente. La patogenia se atribuye al crecimiento anormal de los cartílagos costales. Siguiendo el principio fundamental de que toda deformación congénita que produce síntomas reclama la atención del cirujano, se recomienda la cirugía correctiva en la edad temprana de la vida, porque la manipulación operatoria se lleva a cabo en un palmo de extensión. Presentamos el caso de un varón de 18 años de edad, de 1.90 metros de estatura, jugador de baloncesto, a quien se le colocó una prótesis modelada de silicon por debajo del plano fasciomuscular, para corregir el defecto físico.

Pectus excavatum is the commonest congenital defect of the anterior chest wall, accounting for 90-92% of all cases, the rest is distributed between pectus carinatum, cleft sternum, Cantrell's syndrome and Poland's syndrome. In Mexico, pectus excavatum occurs in 1 of 1,000 live births. This deformity is barely noticed at birth but becomes more evident during childhood and may constitute a functional, psychosocial and/or aesthetic problem for the adolescent. The pathophysiology involved is an abnormal growth of costal cartilages. Following the fundamental principle that any symptomatic congenital deformity claims the surgeon's attention, corrective surgery is recommended early in life, when the surgical manipulation is made in a small field. We present the case of an 18 year old, 1.9 m tall, basketball player, who had a modelled silicon implant inserted beneath the fasciomuscular layer, as a cosmetic repair of his deformity.

Short term effects of Glomus claroideum and Azospirillum brasilense on growth and root acid phosphatase activity of Carica papaya L. under phosphorus stress.

Arbuscular mycorrhizal fungi (AMF) are able to increase root enzymatic activity of acid and alkaline phosphatases. However, the role of AMF on phosphatase activity has not been reported in papaya (Carica papaya L.), which is frequently established at places with soil phosphorus (P) deficiencies. The goals of this research were to determine the effect of Glomus claroideum (Gc), and plant growth promoting rhizobacterium Azospirillum brasilense strain VS7 [Ab]) on root phosphatase activity and seedling growth of Carica papaya L. cv. Red Maradol under low P conditions. There were four treatments-colonization with: 1) Gc, 2) Ab, 3) Gc+Ab, and 4) non-inoculated seedlings. Plants were established in a coarse sand:sandy loam substrate under P-limitation (11 microg P ml(-1)), supplied with a modified Long Ashton Nutrient Solution. Seedling growth was severely reduced by low P. Gc+Ab inoculated plants had greater total dry matter and leaf area than non-colonized plants. Gc-inoculated plants had greater leaf area than non-colonized plants. Treatments did not differ in leaf area ratio, specific leaf area and, total chlorophyll content. There was a non-significant effect on stem relative growth rate with Gc and Gc+Ab plants. Mycorrhizal colonization enhanced the bacterial population 3.4-fold in the Gc+Ab treatment compared with the population quantified in Ab treatment. Soluble and extractable root acid phosphatase activity (RAPA) was higher in Gc inoculated plants. We discussed on the possible relation among both inoculated microorganisms and also with the P-limitation which plants were established.