Linking land-use and land-cover transitions to their ecological impact in the Amazon.

Human activities pose a major threat to tropical forest biodiversity and ecosystem services. Although the impacts of deforestation are well studied, multiple land-use and land-cover transitions (LULCTs) occur in tropical landscapes, and we do not know how LULCTs differ in their rates or impacts on key ecosystem components. Here, we quantified the impacts of 18 LULCTs on three ecosystem components (biodiversity, carbon, and soil), based on 18 variables collected from 310 sites in the Brazilian Amazon. Across all LULCTs, biodiversity was the most affected ecosystem component, followed by carbon stocks, but the magnitude of change differed widely among LULCTs and individual variables. Forest clearance for pasture was the most prevalent and high-impact transition, but we also identified other LULCTs with high impact but lower prevalence (e.g., forest to agriculture). Our study demonstrates the importance of considering multiple ecosystem components and LULCTs to understand the consequences of human activities in tropical landscapes.

Temperature and productivity distinctly affect the species richness of ectothermic and endothermic multitrophic guilds along a tropical elevational gradient.

The diversity of endotherms and ectotherms may be differently affected by ambient temperature and net primary productivity (NPP). Additionally, little is known about how these drivers affect the diversity of guilds of different trophic levels. We assessed the relative role of temperature and NPP in multitrophic guilds of ectothermic (arthropods: ants, ground beetles, spiders, and harvestmen) and endothermic (large mammals) animals along a tropical elevational gradient. We sampled arthropods at eight elevation belts and large mammals at 14 elevation belts in Atlantic rainforest (ranging from 600 to 2450 m.a.s.l.) of Itatiaia National Park, Southeast Brazil. Overall arthropod species richness was more associated with temperature than overall large-mammal species richness, while the latter was more associated with NPP. When separated into trophic guilds, we found that the species richness associated with NPP increased across arthropod trophic levels from herbivores to predators. Conversely, although NPP influenced large-mammal herbivore species richness, its effects did not seem to accumulate across large-mammal trophic levels since the species richness of large-mammal omnivores was more associated with temperature and none of the variables we studied influenced large-mammal predators. We suggest that thermal physiological differences between ectotherms and endotherms are responsible for the way in which arthropods and large mammals interact with or are constrained by the environment. Furthermore, the inconsistency regarding the role of temperature and NPP on species richness across multitrophic guilds of ectotherms and endotherms could indicate that thermal physiological differences might also interfere with energy use and flux in the food web.

Similar alpha and beta diversity changes in tropical ant communities, comparing savannas and rainforests in Brazil and Indonesia.

Local biodiversity can be expected to be similar worldwide if environmental conditions are similar. Here, we hypothesize that tropical ant communities with different types of regional species pools but at similar habitat types in Brazil and Indonesia show similar diversity patterns at multiple spatial scales, when comparing (1) the relative contribution of alpha and beta diversity to gamma diversity; (2) the number of distinct communities (community differentiation); and (3) the drivers of ß-diversity (species replacement or species loss/gain) at each spatial scale. In both countries, rainforests and savannas (biome scale) were represented by three landscapes (landscape scale), each with four transects (site scale) and each transect with 10 pitfall traps (local scale). At the local scale, α-diversity was higher and ß-diversity lower than expected from null models. Hence, we observed a high coexistence of species across biomes. The replacement of species seemed the most important factor for ß-diversity among sites and among landscapes across biomes. Species sorting, landscape-moderated species distribution and neutral drift are potential mechanisms for the high ß-diversity among sites within landscapes. At the biome scale, different evolutionary histories produced great differences in ant community composition, so the replacement of species is, at this scale, the most important driver of beta diversity. According to these key findings, we conclude that distinct regional ant species pools from similar tropical habitat types are similarly constrained across several spatial scales, regardless of the continent considered.

Testing the context dependence of ant nutrient preference across habitat strata and trophic levels in Neotropical biomes.

Animals are integrated into the wider ecosystem via their foraging and behavior. The compensation hypothesis predicts that animals target their foraging efforts (i) toward nutrients that are scarce in the environment and (ii) toward nutrients that are not present in the usual diet of species, which varies across trophic levels. Understanding how foraging for resources varies locally, such as across habitat strata, and trophic levels will help to elucidate the links between the local environment and communities to the ecological functions that animals mediate. We examined whether the relative resource use of ants varies consistently along a habitat strata gradient and across trophic levels across Neotropical biomes. We placed 4500 baited tubes, each containing one of five liquid resources (sugar, amino acid, lipid, sodium, and distilled water) in one of three habitat strata (subterranean, epigaeic, and arboreal) across 60 transects in Amazon, Atlantic Forest, Caatinga, Cerrado, Pampa, and Pantanal biomes. We assessed the relative resource use of all ants across the habitat strata and among two different trophic groups across biomes. The relative preference for sugar increased from subterranean to arboreal strata in all biomes, while the relative preference for lipids decreased at this gradient in five biomes. We also found that in general sugar-consuming ants foraged more for sugar and less for lipids than predatory ants across biomes. Conversely, we found no consistency across biomes in nutrient preference of amino acid and sodium across habitat strata or trophic levels. Overall, our results indicate sugar limitation in the arboreal stratum and lipid limitation on the ground across biomes and that the trophic level of ants strongly determines their foraging efforts-possibly because ants try to fix their dietary nutrient imbalances. Hence, our findings suggest strong local niche partitioning of sugar and lipid use across habitat strata and trophic levels and that other large spatial scale processes influence the local amino acid and sodium dynamics.

Os animais se integram nos ecossistemas pelos seus esforços e comportamento de forrageio. A hipótese da compensação prevê que os animais direcionam seus esforços de forrageio para (i) nutrientes que são escassos no ambiente e (ii) para nutrientes que não estão presentes em sua dieta, que variam entre os níveis tróficos. Assim, entender como a busca de recursos varia localmente entre os estratos de habitat e entre níveis tróficos, ajudará a entender as conexões entre o ambiente e suas comunidades com as funções ecológicas mediadas pelos animais. Avaliamos se o uso relativo de recursos das formigas varia consistentemente em um gradiente de estratos de habitat e em diferentes níveis tróficos nos biomas Neotropicais. Disponibilizamos um total de 4.500 tubos contendo um de cinco recursos líquidos (açúcar, aminoácido, lipídio, sódio e água destilada) em três estratos de habitat (subterrâneo, epigéico e arbóreo) em 60 transectos distribuídos nos biomas Amazônia, Mata Atlântica, Caatinga, Cerrado, Pampa e Pantanal. Avaliamos o uso relativo de recursos de todas as formigas ao longo dos estratos de habitat e entre dois grupos tróficos diferentes nos biomas. A preferência relativa por açúcar aumentou do estrato subterrâneo para o arbóreo em todos os biomas, enquanto a preferência relativa por lipídios diminuiu neste gradiente em cinco biomas. Também descobrimos que, em geral, as formigas consumidoras de açúcar procuram mais açúcar e menos lipídios do que as formigas predadoras nos biomas. Por outro lado, não encontramos consistência entre biomas na preferência nutricional de aminoácidos e sódio nos estratos de habitat ou níveis tróficos. No geral, nossos resultados indicam limitação de açúcar no estrato arbóreo e limitação de lipídios no solo em todos os biomas e que o nível trófico das formigas determina fortemente seus esforços de forrageamento - possivelmente porque as formigas tentam corrigir seus desequilíbrios de nutrientes na dieta. Portanto, nossas descobertas sugerem forte partição de nicho local de uso de açúcar e lipídios em estratos de habitat e níveis tróficos e que outros processos de grande escala espacial influenciam a dinâmica local de aminoácidos e sódio.

Physical exercise practice was positively associated with better dietary practices of aged people during COVID-19 social distance: A cross-sectional study.

BACKGROUND & AIMS: COVID-19 is a respiratory syndrome caused by SARS-CoV-2. In the absence of effective treatment and vaccines, social distance (SD) is essential to reduce the spread of the virus. However, SD generates several behavioral changes, especially in psychological (i.e., emotions and depressive symptoms) and lifestyle-related parameters (i.e., diet, physical activity, and sleep), and the aged people could be more susceptible to COVID-19 SD-related effects (i.e., loneliness, stress, fear, concerns about life, etc.). As such, we aimed to explore the relationship between lifestyle- (physical exercise practice and sleep quality) and psychological-related factors with the dietary practices derived from the Brazilian National Food Guide of older adult during the COVID-19 SD. METHODS: A web-based survey was conducted in São Paulo, Brazil. Data were collected between August and December 2020 (a period of social isolation due to the COVID-19 pandemic). The questions were extracted from validated questionnaires to verify dietary practices (score of adhesion to the food guide for the Brazilian population), sleep quality (by Pittsburgh questionnaire), emotional food-related dimensions (by Three-factor Eating Questionnaire), and depression symptoms (by Beck's questionnaire). RESULTS: Results were from 229 aged people (mean age 66.5 ± 6.02 years old; mean BMI 27.5 ± 4.32 kg/m2; mean sleep duration 8.23 ± 1.41 h; Pittsburg sleep quality score 6.55 ± 4.83; dietary practice score 42.5 ± 6.47). In the adjusted-linear regression model, we verified that physical exercise practice at home (ß = 2.179; 95% CI: 0.599 to 3.758; p = 0.007) during COVID-19 SD was positively associated with better dietary practices in aged people. In contrast, emotional eating was negatively associated with dietary practices (ß = -0.051; 95% CI: -0.092 to - 0.009; p = 0.015). CONCLUSION: We conclude that in aged people, physical exercise practice at home during COVID-19 SD was positively associated with better dietary practices, while emotional eating was negatively associated.

From species descriptions to diversity patterns: the validation of taxonomic data as a keystone for ant diversity studies reproducibility and accuracy.

Research findings in natural sciences need to be comparable and reproducible to effectively improve our understanding of ecological and behavioural patterns. In this sense, knowledge frontiers in biodiversity studies are directly tied to taxonomic research, especially in species-rich tropical regions. Here we analysed the taxonomic information available in 470 studies on Brazilian ant diversity published in the last 50 years. We aimed to quantify the proportion of studies that provide enough data to validate taxonomic identification, explore the frequency of studies that properly acknowledge their taxonomic background, and investigate the primary resources for ant identification in Brazil. We found that most studies on Brazilian ant diversity (73.6%) explicitly stated the methods used to identify their specimens. However, the proportion of papers that provide complete data for the repository institutions and vouchered specimens is vanishingly small (5.8%). Additionally, only 40.0% of the studies consistently presented taxon authorities and years of description, rarely referencing taxonomic publications correctly. In turn, the number of specialists and institutions consulted for ant identification in Brazil has increased in the last years, along with the number of studies that explicitly provide their taxonomic procedures for ant identification. Our findings highlight a shift between generations regarding the recognition of taxonomy as fundamental science, deepening our understanding of biodiversity.

ATLANTIC ANTS: a data set of ants in Atlantic Forests of South America.

Ants, an ecologically successful and numerically dominant group of animals, play key ecological roles as soil engineers, predators, nutrient recyclers, and regulators of plant growth and reproduction in most terrestrial ecosystems. Further, ants are widely used as bioindicators of the ecological impact of land use. We gathered information of ant species in the Atlantic Forest of South America. The ATLANTIC ANTS data set, which is part of the ATLANTIC SERIES data papers, is a compilation of ant records from collections (18,713 records), unpublished data (29,651 records), and published sources (106,910 records; 1,059 references), including papers, theses, dissertations, and book chapters published from 1886 to 2020. In total, the data set contains 153,818 ant records from 7,636 study locations in the Atlantic Forest, representing 10 subfamilies, 99 genera, 1,114 ant species identified with updated taxonomic certainty, and 2,235 morphospecies codes. Our data set reflects the heterogeneity in ant records, which include ants sampled at the beginning of the taxonomic history of myrmecology (the 19th and 20th centuries) and more recent ant surveys designed to address specific questions in ecology and biology. The data set can be used by researchers to develop strategies to deal with different macroecological and region-wide questions, focusing on assemblages, species occurrences, and distribution patterns. Furthermore, the data can be used to assess the consequences of changes in land use in the Atlantic Forest on different ecological processes. No copyright restrictions apply to the use of this data set, but we request that authors cite this data paper when using these data in publications or teaching events.

Diaspore Removal by Ants Does Not Reflect the Same Patterns of Ant Assemblages in Mining and Rehabilitation Areas.

Mining is responsible for drastic ecosystem changes and rehabilitation is used to promote the return of functions after these impacts. In this scenario, we investigated the responses of ant assemblages and diaspore removal by ants to the transformations caused by mining and rehabilitation predicting that (a) the increase in plant density (a proxy for mining intensity) led to an increase in ant richness, percentage of diaspores removed, and changes in species composition that in turn are correlated with changes in environmental variables; (b) the increase in vegetation structure (a proxy for rehabilitation ages) led to an increase in ant richness, percentage of diaspores removed, and changes in species composition that in turn are correlated with changes in environmental variables. Additionally, we also verified which functional groups were primarily responsible for diaspore removal. We sampled arboreal and epigeic ants, diaspore removal by ants, and environmental variables. We found that ant richness and diaspore removal in mining intensity gradient are positively correlated to plant density. Although vegetation structure is positively correlated with ant richness, we found no changes in diaspore removal in rehabilitation gradient. Epigeic omnivore and epigeic generalist predator ants were the most responsible for diaspore removal. Then, we observed that mining decreases ant richness, altering ant assemblages and their functions, and rehabilitation with exotic plants is ineffective to promote the colonization by the main diaspore-removing ants.

Digital dermoscopy: a complementary method in the diagnosis of scabies.

Scabies is an ectoparasitosis caused by Sarcoptes scabiei var. hominis, characterized clinically by pruritic lesions in typical locations; the crusted form is a rare manifestation. The diagnosis is usually established based on the clinical picture, but dermoscopy can be an important complementary method, as it allows the observation of a brownish triangular structure with a hang-glider appearance. A case of crusted scabies is reported; the magnification of the images obtained by digital dermoscopy allowed the demonstration of a structure usually observed only with videodermoscopy.

Isolated and Community Contexts Produce Distinct Responses by Host Plants to the Presence of Ant-Aphid Interaction: Plant Productivity and Seed Viability.

Ant-aphid interactions may affect host plants in several ways, however, most studies measure only the amount of fruit and seed produced, and do not test seed viability. Therefore, the aim of this study was to assess the effects of the presence of ant-aphid interactions upon host plant productivity and seed viability in two different contexts: isolated and within an arthropod community. For this purpose we tested the hypothesis that in both isolated and community contexts, the presence of an ant-aphid interaction will have a positive effect on fruit and seed production, seed biomass and rate of seed germination, and a negative effect on abnormal seedling rates, in comparison to plants without ants. We performed a field mesocosm experiment containing five treatments: Ant-aphid, Aphid, Community, Ant-free community and Control. We counted fruits and seeds produced by each treatment, and conducted experiments for seed biomass and germinability. We found that in the community context the presence of an ant-aphid interaction negatively affected fruit and seed production. We think this may be because aphid attendance by tending-ants promotes aphid damage to the host plant, but without an affect on seed weight and viability. On the other hand, when isolated, the presence of an ant-aphid interaction positively affected fruit and seed production. These positive effects are related to the cleaning services offered to aphids by tending-ants, which prevent the development of saprophytic fungi on the surface of leaves, which would cause a decrease in photosynthetic rates. Our study is important because we evaluated some parameters of plant fitness that have not been addressed very well by other studies involving the effects of ant-aphid interactions mainly on plants with short life cycles. Lastly, our context dependent approach sheds new light on how ecological interactions can vary among different methods of crop management.

Digital dermoscopy: a complementary method in the diagnosis of scabies

Abstract Scabies is an ectoparasitosis caused by Sarcoptes scabiei var. hominis, characterized clinically by pruritic lesions in typical locations; the crusted form is a rare manifestation. The diagnosis is usually established based on the clinical picture, but dermoscopy can be an important complementary method, as it allows the observation of a brownish triangular structure with a hang-glider appearance. A case of crusted scabies is reported; the magnification of the images obtained by digital dermoscopy allowed the demonstration of a structure usually observed only with videodermoscopy.

Are all ant mosaics caused by competition?

In this paper we tested the hypothesis that ant mosaics are generated and maintained by stochastic processes, against the general idea that deterministic processes, such as competition, are the main forces that structure these communities. We analysed 14 published ant mosaics, described for crops and natural forests, transforming their data in presence/absence matrices. These matrices were submitted to species co-occurrence analysis, using software that generates null models. The observed species co-occurrence index was then statistically compared to the null matrices, to test whether there is evidence for biological processes structuring the ant communities. From the 14 mosaics analysed, seven had less and one had more co-occurrence than expected by chance. In six mosaics, species co-occurrence was within the 95% limits of frequency distribution of randomized matrices. Even though the observation of ant spatial distribution, together with association indices between species pairs, have usually been interpreted as a result of negative interactions, our results show that in only 50% of the studied mosaics there is evidence for this explanation. Furthermore, there are alternative hypotheses to explain the result of less co-occurrence than expected by chance, besides the competition hypothesis. Association of ant species with resources and conditions may also explain the observed pattern, although these hypotheses are rarely exploited. In conclusion, competition may be an important process when studying assembly rules in ant communities, although it is certainly not the only process involved. The importance of other biological processes and of stochastic events has to be taken into account to explain the species distribution patterns.

Estrongiloidíase gástrica em paciente imunocompetente - relato de caso / Gastric strongyloidiasis in immunocompetent patients - case report

A estrongiloidíase humana é um tipo de helmintose causada por duas espécies de nematoides intestinais pertencentes ao gênero Strongyloides. O acometimento do estômago é raro, especialmente em imunocompetentes, e quando acontece os principais sintomas gastrointestinais incluem diarreia, desconforto abdominal, náusea e anorexia. O exame anatomopatológico a partir de biópsias fornece o diagnóstico definitivo. O objetivo deste trabalho é relatar um caso atípico de estrongiloidíase gástrica em paciente imunocompetente que apresentava quadro de dor abdominal difusa recorrente.

Human strongyloidiasis is a type of helminth caused by two species of intestinal nematodes belonging to the genus Strongyloides. Stomach upset is rare, especially in immunocompetent patients, and when major gastrointestinal symptoms do occur they include diarrhea, abdominal discomfort, nausea, and anorexia. Anatomopathological examination from biopsies provides the definitive diagnosis. The objective of this study was to report an atypical case of gastric strongyloidiasis in an immunocompetent patient with recurrent diffuse abdominal pain.

Ectasia vascular do antro gástrico (estômago em melancia) ­ um relato de caso / Gastric antral vascular ectasia (watermelon stomach) ­ a case report

A Ectasia Vascular do Antro Gástrico (EVAG) é uma condição rara associada à hemorragia digestiva e anemia significativa. Acomete principalmente idosos e mulheres. É considerada uma anormalidade adquirida, resultando em ectasia da mucosa e da microvasculatura gástrica e é identificada na endoscopia digestiva alta (EDA). O diagnóstico pode se tornar complexo, pois a sua aparência endoscópica assemelha-se à gastropatia portal hipertensiva (GPH) ou à gastrite antral¹ , ². Este estudo tem como objetivo relatar um caso de EVAG e notificar a importância do conhecimento desta patologia, bem como a inclusão no diagnóstico diferencial à doenças como GPH e gastrite antral, para conduzir ao tratamento apropriado, pois apresenta bom prognóstico. Trata-se de um estudo descritivo, no qual foi relatado caso de paciente masculino, 76 anos, que procurou atendimento médico por acentuada anemia e melena. O paciente apresentava quadro anêmico há 6 meses, associado à fadiga, palidez e histórico de múltiplas transfusões sanguíneas. Foi requisitado EDA, o qual apresentou colunas vermelhas longitudinais no antro gástrico, possibilitando a associação com a clínica e seu diagnóstico. O paciente foi conduzido para terapêutica com o Coagulador de Plasma de Argônio e apresentou boa evolução4 . Pacientes idosos que apresentam anemia crônica sem causa aparente e/ou hemorragia digestiva alta, associada com a sintomatologia citada, devem ser endoscopicamente investigados para EVAG³. O diagnóstico desta patologia é muitas vezes dificultado, já que existem outras causas mais comuns de hemorragia digestiva, que mascaram o diagnóstico. Desta forma, destaca-se a importância do conhecimento dessa enfermidade, pois o tratamento adequado apresenta-se eficaz.

Gastric Antral Vascular Ectasia (GAVE) is a rare condition associated with digestive hemorrhage and significant anemia. It mainly affects elderly and women. It is considered an acquired abnormality, resulting in mucosal ectasia and gastric microvasculature and is identified in upper digestive endoscopy (EDA). The diagnosis can become complex, since its endoscopic appearance resembles hypertensive portal gastropathy (GPH) or antral gastritis¹, ². This study aims to report a case of GAVE and to notify the importance of the knowledge of this pathology, as well as the inclusion in the differential diagnosis to diseases such as GPH and antral gastritis, to lead to appropriate treatment, since it presents a good prognosis. This is a descriptive study, in which a case of a 76-year-old male patient who sought medical care for marked anemia and mane was reported. The patient presented an anemic condition for 6 months, associated with fatigue, pallor and history of multiple blood transfusions. EDA was requested, which presented longitudinal red columns in the gastric antrum, making possible the association with the clinic and its diagnosis. The patient was submitted to therapy with the Argon Plasma Coagulator and showed good evolution4. Elderly patients presenting with unexplained chronic anemia and / or upper gastrointestinal bleeding, associated with the mentioned symptomatology, should be endoscopically investigated for GAVE³. The diagnosis of this pathology is often difficult, since there are other more common causes of digestive hemorrhage, which mask the diagnosis. In this way, the importance of the knowledge of this disease is highlighted, since the appropriate treatment is effective.

Clinical and epidemiological profile of sexually transmitted diseases in children attending a referral center in the city of Manaus, Amazonas, Brazil.

BACKGROUND: Sexually transmitted diseases in children remain a public health concern that is relatively ignored. Further data are required on the management of these diseases and their association with child sexual abuse. OBJECTIVES: To describe the clinical and epidemiological profile of sexually transmitted diseases in children receiving care at a referral center in the city of Manaus, Amazonas, Brazil. METHODS: A descriptive, exploratory study was conducted to evaluate the clinical, epidemiological and laboratory characteristics of the sexually transmitted diseases (STD) found in children who received care at this clinic between January 2003 and December 2007. RESULTS: A total of 182 children with STDs were included in the study. The majority were female (65.4%), dark-skinned and with a mean age of 8.5 years. Furthermore, 89% were from the city of Manaus and their parents were usually responsible for having brought them to the clinic. Genital warts constituted the principal diagnosis in children of both sexes and 90.1% of the children had only one STD. CONCLUSIONS: The frequencies and clinical characteristics of the STDs in the children in this study were similar to data reported in the literature. Although the signs and symptoms of the STDs found in these children do not, in themselves, constitute reliable parameters by which to confirm abuse, professionals should always be alert to this possibility, since these diseases may represent a sign of sexual offenses that may be dissimulated and repetitive.

Do you know this syndrome? Huntchinson-Gilford Syndrome (Progeria).

Huntchinson-Gilford Syndrome (Progeria) is a rare autosomal dominant disease characterized by premature aging. It is reported the case of child whose alopecia started at the age of 6 months on the occipital region. The child also presented scleroderma plaques on the abdomen. This syndrome presents alterations in many organs and systems such as the skin and the skeletal and cardiovascular systems. The diagnosis is clinical and there is no treatment for it but recognition is necessary to minimize early atherosclerosis through the control of dyslipidemia.

Can anthropic fires affect epigaeic and hypogaeic Cerrado ant (Hymenoptera: Formicidae) communities in the same way? / ¿Pueden los incendios afectar a las comunidades de hormigas epígeas e hipógeas (Hymenoptera: Formi cidae) de Cerrado de la misma manera?

AbstractFire occurrences are a common perturbation in Cerrado ecosystems, and may differently impact the local biodiversity. Arthropods are one of the taxa affected by fires, and among them, ants are known as good bioindicators. We aimed to evaluate the effect of anthropic fires on epigaeic and hypogaeic ant communities (species richness and composition) in Cerrado areas with different post-fire event recovery periods. We conducted the study in four Cerrado areas during two weeks of 2012 dry season: one unburned and three at different post-fire times (one month, one and two years). We sampled ants with pitfall traps in epigaeic and hypogaeic microhabitats. We collected 71 ant morpho-species from 25 genera. In the epigaeic microhabitat we sampled 56 morpho-species and 42 in the hypogaeic microhabitat. The area with the shortest recovery time presented lower epigaeic ant species richness (4.3 ± 2.00) in comparison to the other areas (8.1 ± 2.68 species on one year area; 10.3 ± 2.66 species on two years area; 10.4 ± 2.31 species on control area), but recovery time did not affect hypogaeic ant species richness. Regarding ant species composition, fire did not directly affect hypogaeic ant species, which remained the same even one month after fire event. However, two years were not enough to reestablish ant species composition in both microhabitats in relation to our control group samples. Our study is the first to assess anthropic fire effects upon epigaeic and hypogaeic ants communities; highlighting the importance of evaluating different microhabitats, to more accurately detect the effects of anthropic disturbances in biological communities. We concluded that ant communities are just partially affected by fire occurrences, and epigaeic assemblages are the most affected ones in comparison to hypogaeic ants. Furthermore the study provides knowledge to aid in the creation of vegetation management programs that allow Cerrado conservation.Rev. Biol. Trop. 64 (1): 95-104. Epub 2016 March 01.

ResumenLos incendios son una alteración común en los ecosistemas del Cerrado brasileño y pueden causar diferentes efectos sobre la biodiversidad. Los artrópodos son uno de los taxones comúnmente afectados por el fuego, y entre ellos, se conoce que las hormigas son buenos bioindicadores. El objetivo de este trabajo fue evaluar el efecto de los incendios antrópicos sobre las comunidades de hormigas epígeas e hipógeas (riqueza de especies y composición) en áreas del Cerrado en diferentes tiempos de recuperación. Para ello, el estudio se realizó en cuatro áreas del Cerrado durante la temporada seca del 2012: una área no quemada y otras tres áreas en diferentes momentos post-incendio (un mes, uno y dos años). Las hormigas fueron muestreadas utilizando trampas de caída en los microhábitats epígeo e hipógeo. Fueron recolectadas 71 morfo-especies de hormigas pertenecientes a 25 géneros. En el microhábitat epígeo recolectamos 56 morfo-especies y en el microhábitat hipógeo 42. El área con el menor tiempo de recuperación presentó una menor riqueza de especies de hormigas epígeas (4.3 ± 2.00) en comparación con las otras áreas (8.1 ± 2.68 especies en el área de un año; 10.3 ± 2.66 especies en el área de dos años; 10.4 ± 2.31 especies en el área de control), pero el tiempo de recuperación no afectó riqueza de especies de hormigas hipógeas. En cuanto a la composición de especies, el fuego no afectó directamente a las especies de hormigas hipógeas, la cual se mantuvo igual, incluso un mes después del incendio. Sin embargo, dos años no fueron suficientes para restablecer la composición de especies de hormigas en ambos microhábitats en relación con las muestras del área control. Nuestro estudio es el primero en evaluar los efectos del fuego antrópico sobre las comunidades de hormigas epígeas y hipógeas; se destaca la importancia de la evaluación de diferentes microhábitats para detectar con mayor precisión los efectos de las alteraciones antrópicas en las comunidades biológicas. Las comunidades de hormigas son solo parcialmente afectadas por incendios y las epígeas son las más perjudicadas. Además, este estudio proporciona conocimientos que pueden ayudar a la creación de programas de manejo de la vegetación del Cerrado, lo que permite conservar este importante bioma brasileño.

Case for diagnosis. Mycosis fungoides.

An 18-year old female patient presented with a single, erythematous, desquamative plaque. The clearly outlined lesion was situated in the abdominal region. The patient reported that it had been present for the past year and that she had used no previous medication. Histopathology showed lymphocytic infiltration with atypia, principally affecting the superficial dermis with epidermotropism and mild spongiosis. Immunophenotyping revealed a predominance of CD3-positive cells, confirming the diagnosis of mycosis fungoides.

Agreement between dermatological diagnoses made by live examination compared to analysis of digital images.

BACKGROUND: Teledermatology is seldom used in Brazil, although some incipient initiatives have been implemented in the state of Amazonas. Further studies are still required to confirm the feasibility and efficacy of this diagnostic tool. OBJECTIVES: To evaluate the efficacy of an asynchronous method of teledermatology using simple, inexpensive technological resources. METHODS: One hundred and seventy-four patients were examined by four dermatologists, two clinic-based dermatologists, who diagnosed the patients following live examination (A1 and A2), and two consultant specialists in image dermatology, who reached diagnoses by examining images of the lesions and the patients' clinical histories (B1 and B2). The agreement between live examination and examination of images was evaluated. RESULTS: Agreement between the two live examiners (A1 and A2) with respect to the principal diagnosis was 83.3% compared to 81.0% between the physicians who diagnosed by examining images (B1 and B2). Agreement between the principal diagnosis established by live examination and that obtained from examining images ranged from 78.2% to 83.9%, CONCLUSION: Agreement between diagnoses of dermatological diseases reached following examination of digital images and those reached following live examination of the patient was excellent.

Você conhece esta síndrome? / Do you know this syndrome?

A Síndrome de Huntchinson-Gilford (Progeria) é uma rara doença autossômica dominante, caracterizada pelo envelhecimento precoce. Relata-se caso de uma criança, que aos 6 meses iniciou alopecia na região occipital e placas esclerodermiformes no abdome. Esta síndrome apresenta alterações em vários órgãos e sistemas como a pele, esquelético e sistema cardiovascular. O diagnóstico é clínico e não possui tratamento, porém seu reconhecimento é necessário para minimizar a aterosclerose precoce através do controle da dislipidemia.

Huntchinson-Gilford Syndrome (Progeria) is a rare autosomal dominant disease characterized by premature aging. It is reported the case of child whose alopecia started at the age of 6 months on the occipital region. The child also presented scleroderma plaques on the abdomen. This syndrome presents alterations in many organs and systems such as the skin and the skeletal and cardiovascular systems. The diagnosis is clinical and there is no treatment for it but recognition is necessary to minimize early atherosclerosis through the control of dyslipidemia.