It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple con... more It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple convolution process. Sometimes, such a convolution depends on physical parameters of the sample which are difficult to estimate a priori. In this case, a blind choice for those parameters usually lead to wrong results, e.g., in posterior image segmentation processing. In this manuscript, we propose a simple connection between phase-retrieval algorithms and optimization strategies, which lead us to ways of numerically determining the physical parameters
The objective of this study was to quantify total mercury in highly popular Amazonian fish pacu, ... more The objective of this study was to quantify total mercury in highly popular Amazonian fish pacu, curimatã, jaraqui, and sardinha from the Madeira River and to estimate the exposure to methylmercury from fish consumption. The samples were obtained from two locations - Puruzinho Igarapé and Santa Rosa - near Humaitá, Amazonia, Brazil in two seasons of 2015 (high and low waters). The fish were identified, weighed and measured, and lipids were quantified. Total mercury was determined by gold amalgamation-atomic absorption spectrometry. Mean levels were used to calculate exposure of Amazonian and riverine populations. There was significant correlation (p < 0.05) between length × weight for all fish; length × lipid and weight × lipid were significant only for pacu. Total mercury levels varied along muscle tissue for the fish, except for sardinha; therefore muscle from the dorsal area along the fish were sampled, homogenized and used for analysis. The levels of total mercury varied from...
Ambiente e Agua - An Interdisciplinary Journal of Applied Science, 2016
Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair ar... more Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair are usually above the limit recommended by health agencies. The objective of this study was to analyze the methylmercury (MeHg) concentration in fish tissue from the Roosevelt River. The river’s water velocity, depth, pH, temperature, electrical conductivity, dissolved oxygen and substrate type were measured, and fifty specimens distributed in 14 fish species were collected. A total of 64.3% of the sampled species were of the order Characiform and 71.4% of the species were carnivores. Fifty percent of the species had MeHg concentrations above threshold limit (Hg-T 0.5 mg kg-1) established for food by the World Health Organization. Cichla monoculus had the highest value of MeHg (2.45 mg kg-1). The MeHg concentration in fish varied according to dietary habits. The study also found bioaccumulation of MeHg in fish tissue in the following descending order: carnivorous > detritivorous > fr...
Student perception of snakes in a public school in south west Amazon, 2020
RESUMO Acredita-se que as serpentes surgiram aproximadamente há 140 milhões de anos e conhece-las... more RESUMO Acredita-se que as serpentes surgiram aproximadamente há 140 milhões de anos e conhece-las é de fundamental importância. Com isso, este trabalho tem por objetivo verificar a percepção dos alunos sobre serpentes em uma escola pública no município de Humaitá-AM. A pesquisa deu-se no primeiro semestre do ano de 2019, na Escola Municipal Centro de Excelência Irmã Carmem Cronenbold, contemplando alunos do 7º ano do Ensino Fundamental no turno matutino. Aplicou-se questionário não estruturado, no intuito de saber os conhecimentos prévios que os alunos possuíam acerca de serpentes. Verificou-se que os alunos possuem conhecimentos significativos sobre serpentes e sentem medo ao avistá-las. A maioria dos alunos citou que conhecem pessoas que já sofreram acidentes provocados por serpentes e que aquelas devem ter tratamento hospitalar o mais rápido possível. Portanto, a pesquisa realizada demonstrou que os alunos apresentam conhecimentos significativos referentes aos anfíbios e répteis, embora haja confusão em identificar corretamente os dois grupos de animais aqui mencionados. PALAVRAS-CHAVE: CONHECIMENTO; ENSINO DE CIÊNCIAS; HERPETOLOGIA ABSTRACT
It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple con... more It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple convolution process. Sometimes, such a convolution depends on physical parameters of the sample which are difficult to estimate a priori. In this case, a blind choice for those parameters usually lead to wrong results, e.g., in posterior image segmentation processing. In this manuscript, we propose a simple connection between phase-retrieval algorithms and optimization strategies, which lead us to ways of numerically determining the physical parameters.
Fulan, J. A., Anjos, M. R. (2019) Variation of the rainfall regime in the Northern region and its... more Fulan, J. A., Anjos, M. R. (2019) Variation of the rainfall regime in the Northern region and its effect on the Odonata (Insecta) in Been river, Amazonas, Brazil. Acta Zoológica Mexicana (nueva serie), 35, 1-6. https://doi.org/ ABSTRACT. The goal of this work was to know the effect of precipitation in four periods (Rising, Flood, Lowing and Dry) on Odonata larvae living near to the macrophyte Salvinia auriculata Aubl., in Been River, Amazonas, Brazil. The biological material was collected in the Been river in the section near the river Madeira, state of Amazonas, Brazil. Sampling was conducted in stands of three macrophytes S. auriculata in four periods: rising (November 2012), flood (February 2013), lowing (May 2013), and dry (August 2013). A total of 286 Odonata larvae were identified in the river studied. Six families and 14 genera were identified. The flood period showed the highest abundance in the studied period. Acanthagrion presented a positive correlation with flood period in axis 1 and Telebasis also positive, but in the dry period. In conclusion, although there are few studies on Odonata larvae associated with floating macrophytes in the Amazon, the results of this work showed the importance of knowing the distribution of larval abundance throughout the year. Flood and dry period showed to be the period with the highest abundance of Odonata genera. In addition, the principal component analysis showed that some species are more sensitive to the periods of the year, Telebasis in the dry period and Acanthagrion in the flood period. Fulan, J. A., Anjos, M. R. (2019) Variación del régimen de precipitaciones en la región norte y su efecto sobre Odonatos (Insecta) en el río Been, Amazonas, Brasil. Acta Zoológica Mexicana (nueva serie), 35, 1-6. https://doi.org/ RESUMEN. El objetivo de este trabajo fue conocer el efecto de la precipitación en cuatro períodos (aumento, inundación, baja y sequía) en las larvas de Odonata que viven cerca del macrófito Salvinia
This study presents an inventory of the ichthyofauna of the lower Roosevelt River sub-basin and i... more This study presents an inventory of the ichthyofauna of the lower Roosevelt River sub-basin and its associated tributaries. Fish sampling with fishing nets and measurements of environmental parameters of water occurred in November/2012 (rising water), February/2013 (flooding), May/2013 (falling water) and August/2013 (drought). Depth mean was 8.86 m, water transparency was 0.6 m, conductivity was 22.7 μS.cm-1 , pH was 6.59, dissolved oxygen was 7.63 mg.l-1 and temperature was 28°C. The total estimated capture area was 68,829.6 m 2 during 2,880 hours. The catch per unit Effort (CPUE) was 0.37 individuals m-2 .day-1. Species were spatially aggregated in all sampling points and river water levels. A total of 5,183 individuals distributed in 7 orders, 29 families, 104 genders and 188 species were sampled in this survey. The diversity index was 4.121 and equitability index was 0.789. The Characiforms order was the most abundant with 106 species, followed by Siluriforms with 63 species and Cichliforms with 23 species. The most abundant species was Serrasalmus rhombeus (Linnaeus, 1766) with 327 individuals (5.9%), followed by Chalceus epakros (Cope, 1870) with 309 individuals (5.6%) and Acestrorhynchus microlepis (Schomburgk, 1841) with 250 individuals (4.5%). Trophicity was characterized by omnivorous (28.6%), piscivorous (14.3%), carnivorous (13.8%) and detritivorous (12.8%). According to IBAMA's regulation, 29.25% of captured species presents ornamental potential. Levantamento de espécies de peixes do Baixo Rio Roosevelt, Sudoeste da Bacia Amazônica Resumo: Este estudo apresenta um inventário da ictiofauna da sub-bacia do baixo Rio Roosevelt e seus tributários associados. As coletas de peixes com malhadeiras e as medições de parâmetros ambientais da água ocorreram em Novembro/2012 (enchente), Fevereiro/2013 (cheia), Maio/2013 (vazante) e Agosto/2013 (seca). A média da profundidade foi 8,86 m, da transparência da água foi 0,6 m, da condutividade foi 22,7 μS.cm-1 , do pH foi 6,59, do oxigênio dissolvido foi 7,63 mg.l-1 e da temperatura da água foi 28°C. A área total de captura estimada foi 68.829,6 m 2 durante 2880 horas. A captura por unidade de esforço (CPUE) foi 0,37 indivíduos m-2 .dia-1. As espécies foram espacialmente agregadas em todos os pontos de coleta e períodos de coleta. Um total de 5183 peixes em 7 ordens, 29 famílias, 104 gêneros e 188 espécies foram coletados. O índice de diversidade foi 4,121 e o índice de equidade foi 0,789. As ordens Characiforme, Siluriforme e Cichliforme foram as mais abundantes. As espécies Serrasalmus rhombeus Linnaeus 1766 com 327 indivíduos (5,9%), Chalceus epakros (Cope 1870) com 309 indivíduos (5,6%) e Acestrorhynchus microlepis Schomburgk 1841 com 250 indivíduos (4,5%) foram as mais abundantes. Os onívoros (28,6%), piscívoros (14,3%), carnívoros (13,8%) e detritívoros (12,8%) foram os indivíduos mais abundantes. De acordo com o IBAMA, 29,25% das espécies capturadas tem potencial ornamental. Palavras-chave: Ictiofauna; Inventário; Biodiversidade; Bacia do Rio Madeira.
Resumo Coleções biológicas representam fonte crucial para estratégias de atuação governamental. T... more Resumo Coleções biológicas representam fonte crucial para estratégias de atuação governamental. Tratam-se de depósitos de organismos que, são, ou foram, encontrados em sistemas naturais. Sua importância propaga-se desde pesquisas científicas abordando evolução, sistemática, filogenia e ecologia, objetivando fornecimento de dados utilizados para formular estratégias conservacionistas estendendo-se às práticas de ensino, entre outras, com implicações em todos os níveis da sociedade. O presente estudo visou desenvolver habilidades e competências dos conteúdos teóricos e práticos sobre coleções biológicas explorando a ictiofauna regional a fim de criar-se protocolos e procedimentos adequados a esta prática que pudessem ser reproduzidos facilitando a gestão e organização de dados. Abstract Biological collections represent crucial source for government action strategies, these are deposits of organisms that are or have been found in natural systems. Its importance propagates from scientific research addressing evolution, systematics, phylogeny and ecology, to provide data used to formulate conservation strategies extending to teaching practices, among others, with implications at all levels of society. The study aimed to develop skills and competencies of the theoretical and practical content of biological collections exploring the regional fish fauna in order to create up protocols and procedures to this practice that could be played facilitating the management and organization of data.
Resumo O desflorestamento de áreas protegidas na Amazônia implica em uma série de fatores socioam... more Resumo O desflorestamento de áreas protegidas na Amazônia implica em uma série de fatores socioambientais deletérios, dentre os quais destacam-se conflitos sociais, empobrecimento da biodiversidade, degradação do solo, comprometimento de bacias hidrográficas, além dos serviços ambientais oferecidos, que ainda hoje não são considerados em estudos de impactos ambientais e quando estudados, não são valorados economicamente ou acabam por ser subdimensionados, implicando em perdas de oportunidades econômicas associadas ao uso sustentável de recursos naturais e de áreas de interesse para a conservação. Este estudo buscou apontar atividades ilícitas no interior e entorno da área especial de proteção ambiental (APA) Rio Madeira em Rondônia de acordo com o disposto no Termo de Referência, Nº 001/CAO-AMB/MP/2006, com ação e apoio dos órgãos interinstitucionais BPM/PM, SEDAM, SIPAM, INCRA, IBAMA e EMBRAGEO para que se pudesse entender a dinâmica do desflorestamento em unidades de conservação e terras indígenas do estado. Observou-se que a presença de áreas de assentamento, fazendas, perímetro urbano de Porto Velho e a hidrelétrica de Sando Antônio no entorno da APA Rio Madeira, têm influenciado na perda de cobertura vegetal desta. Também podem influenciar mudanças na dinâmica do ecossistema da UC e presença de espécies animais e vegetais.
The deforestation of protected areas in Brazil, especially in the Amazon, has triggered a series ... more The deforestation of protected areas in Brazil, especially in the Amazon, has triggered a series of deleterious socio-environmental factors. Among the most well-known are social conflicts, impoverishment of biodiversity, soil degradation, commitment and generation of pollution sources in watersheds, as well as the environmental services offered, which are not yet considered in studies of environmental impacts and when studied, are not valued economically or end up being undersized, implying loss of economic opportunities associated with the sustainable use of natural resources and areas of conservation interest. This study aimed to characterize the activities that are not in compliance with the legislation foreseen in the National System of Conservation Units (SNUC), inside and around the special area of the State Forest of Sustained Income (FERS) Araras, in the state of Rondônia. Using Landast image, it was found that in 1998 when the FERS was created 100% of the unit was intact. Approximately a decade later with 18% of the vegetation cover of the unit suppressed and later in 2016 the area where the area was with about 70% of its native cover removed. The study showed that temporary and disordered occupation leads to the suppression of vegetation cover of areas important for the maintenance of biodiversity and environmental services, causing the creation of Conservation Units to lose their true purpose.
The Digital Elevation Model (MDE) describes the configuration of the topography of the terrestria... more The Digital Elevation Model (MDE) describes the configuration of the topography of the terrestrial surface, allowing to derive this product in contours, slope, direction of flow, drainage, slope exposure and solar energy incidence and guides the delimitation of watersheds. Different ways of obtaining models are proposed and MDE SRTM (Shuttle Radar Topography Mission) is widely used with applications in various regions of the world. In southern Amazonia, in the middle course of the Madeira River, the configuration of transition between natural formations of savanna vegetation and dense forest predominates. The canopy of dense vegetation associated with a relief with little altitudinal variation can create a canopy effect, reflecting the microwave radiation emitted by the Space Bus Endeavor, which mapped 80% of the planet's surface in February 2000, influencing abrupt variations of Altitude recorded in the MDE-SRTM. GPS points associated to digitized coordinates of topographic charts were interpolated using the Kriging method and variogram adjustment for the KRIG MDE that represents this transition region between savanna and forest. The MDE SRTM and MDE KRIG are analyzed in this paper, and the main results show that the MDE SRTM distinguishes the two major vegetation (Dense Forest and Savannah) in shades of gray and by whole dimensions. The MDE KRIG presented better representation of the relief with respect to SRTM for the generation of contour lines and delimitation of the basin in this transition region between savannah and forest in tabular formation of sedimentary terraces.
Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair ar... more Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair are usually above the limit recommended by health agencies. The objective of this study was to analyze the methylmercury (MeHg) concentration in fish tissue from the Roosevelt River. The river's water velocity, depth, pH, temperature, electrical conductivity, dissolved oxygen and substrate type were measured, and fifty specimens distributed in 14 fish species were collected. A total of 64.3% of the sampled species were of the order Characiform and 71.4% of the species were carnivores. Fifty percent of the species had MeHg concentrations above threshold limit (Hg-T 0.5 mg kg-1) established for food by the World Health Organization. Cichla monoculus had the highest value of MeHg (2.45 mg kg-1). The MeHg concentration in fish varied according to dietary habits. The study also found bioaccumulation of MeHg in fish tissue in the following descending order: carnivorous > detritivorous > frugivore. Low significant correlations were found between fish weight or length and MeHg. Further studies on MeHg contamination are recommended in tissues of fish consumed in human riverine communities in the Roosevelt River Basin. Bioacumulação de metilmercúrio em tecidos de peixes no rio Roosevelt, Sudoeste da Bacia Amazônica RESUMO O mercúrio tem sido um dos principais poluentes no sistema do rio Amazonas, cujos níveis em peixes e cabelo humano são geralmente acima dos limites recomendados pelos órgãos de saúde. O objetivo deste estudo foi analisar a concentração de metilmercúrio (MeHg) em tecidos de peixes do rio Roosevelt. Os atributos medidos do rio foram a velocidade da água, profundidade, pH, temperatura, condutividade elétrica, oxigênio dissolvido, e profundidade. Cinquenta espécimes distribuídas em 14 espécies de peixes foram coletadas. A ordem Characiformes representou 64,3% das espécies amostradas e os carnívoros representaram 71,4%. Cinquenta por cento das espécies apresentaram concentrações de MeHg acima do limite (Hg-T 0,5 mg kg-1) estabelecido para os alimentos pela Organização Mundial de Saúde. Cichla monoculus apresentou o maior valor de MeHg (2,45 mg kg-1). A concentração de MeHg variou por hábitos alimentares. Este estudo demonstrou bioacumulação de MeHg em tecidos de peixes, como segue: carnívoros > detritívoros > frugívoros. Baixas correlações entre peso ou cumprimento de peixe e MeHg foram encontradas. Recomenda-se um estudo mais aprofundado de contaminação do MeHg em tecidos de peixes consumidos nas comunidades ribeirinhas na bacia do rio Roosevelt. Palavras-chave: biomagnificação, contaminação química, poluição aquática.
People never ate much fish or depended so heavily on the sector for their welfare as they do toda... more People never ate much fish or depended so heavily on the sector for their welfare as they do today. The world consumption of fish per capita increased from 9.9 kg in 1960 to 19.2 kg in 2012. However, Brazil accounted for only 0.86% of world fish production in 2009. The North Region led the setting of fishing continental extraction (54.6%) driven by Amazonas and Pará states in 2009, but came in last place in the continental aquaculture production (10.61%) driven by Amazonas and Rondônia states. Thus, the objective of this study was to understand fish farming in the state of Rondônia in 2009 with data from a questionnaire applied to producers about area in hectares of fish farming, the number of fish stocked, and production in tons. The state of Rondônia produced 11,455.67 tons of fish in fish farming in 2009. Porto Velho was the site with one of the smaller areas and lower production of fish farming, but had the highest stocking density; while Mirante da Serra was the municipality with the largest area and highest production of fish farming, but had one of the lowest stocking densities. On the other hand, Colorado do Oeste was the site that had the highest density storage with smaller area, but its aquaculture production was intermediate compared with other municipalities. The fish farming industry is favored in Rondônia because of the high amount of fish intake in the North region and favorable conditions of production of aquatic organisms. However, it is crucial investments and incentives through public policies to increase the supply and consumption of this food in Brazil, as well as the maintenance of the intake pattern in the North and Northeast Regions.
The 8th EUROPT Workshop on Advances in Continuous Optimization was hosted by the University of Av... more The 8th EUROPT Workshop on Advances in Continuous Optimization was hosted by the University of Aveiro, Portugal. Workshop started with a Welcome Reception of the participants on July 8, followed by two working days, July 9 and July 10. This Workshop ...
It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple con... more It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple convolution process. Sometimes, such a convolution depends on physical parameters of the sample which are difficult to estimate a priori. In this case, a blind choice for those parameters usually lead to wrong results, e.g., in posterior image segmentation processing. In this manuscript, we propose a simple connection between phase-retrieval algorithms and optimization strategies, which lead us to ways of numerically determining the physical parameters
The objective of this study was to quantify total mercury in highly popular Amazonian fish pacu, ... more The objective of this study was to quantify total mercury in highly popular Amazonian fish pacu, curimatã, jaraqui, and sardinha from the Madeira River and to estimate the exposure to methylmercury from fish consumption. The samples were obtained from two locations - Puruzinho Igarapé and Santa Rosa - near Humaitá, Amazonia, Brazil in two seasons of 2015 (high and low waters). The fish were identified, weighed and measured, and lipids were quantified. Total mercury was determined by gold amalgamation-atomic absorption spectrometry. Mean levels were used to calculate exposure of Amazonian and riverine populations. There was significant correlation (p < 0.05) between length × weight for all fish; length × lipid and weight × lipid were significant only for pacu. Total mercury levels varied along muscle tissue for the fish, except for sardinha; therefore muscle from the dorsal area along the fish were sampled, homogenized and used for analysis. The levels of total mercury varied from...
Ambiente e Agua - An Interdisciplinary Journal of Applied Science, 2016
Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair ar... more Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair are usually above the limit recommended by health agencies. The objective of this study was to analyze the methylmercury (MeHg) concentration in fish tissue from the Roosevelt River. The river’s water velocity, depth, pH, temperature, electrical conductivity, dissolved oxygen and substrate type were measured, and fifty specimens distributed in 14 fish species were collected. A total of 64.3% of the sampled species were of the order Characiform and 71.4% of the species were carnivores. Fifty percent of the species had MeHg concentrations above threshold limit (Hg-T 0.5 mg kg-1) established for food by the World Health Organization. Cichla monoculus had the highest value of MeHg (2.45 mg kg-1). The MeHg concentration in fish varied according to dietary habits. The study also found bioaccumulation of MeHg in fish tissue in the following descending order: carnivorous > detritivorous > fr...
Student perception of snakes in a public school in south west Amazon, 2020
RESUMO Acredita-se que as serpentes surgiram aproximadamente há 140 milhões de anos e conhece-las... more RESUMO Acredita-se que as serpentes surgiram aproximadamente há 140 milhões de anos e conhece-las é de fundamental importância. Com isso, este trabalho tem por objetivo verificar a percepção dos alunos sobre serpentes em uma escola pública no município de Humaitá-AM. A pesquisa deu-se no primeiro semestre do ano de 2019, na Escola Municipal Centro de Excelência Irmã Carmem Cronenbold, contemplando alunos do 7º ano do Ensino Fundamental no turno matutino. Aplicou-se questionário não estruturado, no intuito de saber os conhecimentos prévios que os alunos possuíam acerca de serpentes. Verificou-se que os alunos possuem conhecimentos significativos sobre serpentes e sentem medo ao avistá-las. A maioria dos alunos citou que conhecem pessoas que já sofreram acidentes provocados por serpentes e que aquelas devem ter tratamento hospitalar o mais rápido possível. Portanto, a pesquisa realizada demonstrou que os alunos apresentam conhecimentos significativos referentes aos anfíbios e répteis, embora haja confusão em identificar corretamente os dois grupos de animais aqui mencionados. PALAVRAS-CHAVE: CONHECIMENTO; ENSINO DE CIÊNCIAS; HERPETOLOGIA ABSTRACT
It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple con... more It was recently shown that the phase retrieval imaging of a sample can be modeled as a simple convolution process. Sometimes, such a convolution depends on physical parameters of the sample which are difficult to estimate a priori. In this case, a blind choice for those parameters usually lead to wrong results, e.g., in posterior image segmentation processing. In this manuscript, we propose a simple connection between phase-retrieval algorithms and optimization strategies, which lead us to ways of numerically determining the physical parameters.
Fulan, J. A., Anjos, M. R. (2019) Variation of the rainfall regime in the Northern region and its... more Fulan, J. A., Anjos, M. R. (2019) Variation of the rainfall regime in the Northern region and its effect on the Odonata (Insecta) in Been river, Amazonas, Brazil. Acta Zoológica Mexicana (nueva serie), 35, 1-6. https://doi.org/ ABSTRACT. The goal of this work was to know the effect of precipitation in four periods (Rising, Flood, Lowing and Dry) on Odonata larvae living near to the macrophyte Salvinia auriculata Aubl., in Been River, Amazonas, Brazil. The biological material was collected in the Been river in the section near the river Madeira, state of Amazonas, Brazil. Sampling was conducted in stands of three macrophytes S. auriculata in four periods: rising (November 2012), flood (February 2013), lowing (May 2013), and dry (August 2013). A total of 286 Odonata larvae were identified in the river studied. Six families and 14 genera were identified. The flood period showed the highest abundance in the studied period. Acanthagrion presented a positive correlation with flood period in axis 1 and Telebasis also positive, but in the dry period. In conclusion, although there are few studies on Odonata larvae associated with floating macrophytes in the Amazon, the results of this work showed the importance of knowing the distribution of larval abundance throughout the year. Flood and dry period showed to be the period with the highest abundance of Odonata genera. In addition, the principal component analysis showed that some species are more sensitive to the periods of the year, Telebasis in the dry period and Acanthagrion in the flood period. Fulan, J. A., Anjos, M. R. (2019) Variación del régimen de precipitaciones en la región norte y su efecto sobre Odonatos (Insecta) en el río Been, Amazonas, Brasil. Acta Zoológica Mexicana (nueva serie), 35, 1-6. https://doi.org/ RESUMEN. El objetivo de este trabajo fue conocer el efecto de la precipitación en cuatro períodos (aumento, inundación, baja y sequía) en las larvas de Odonata que viven cerca del macrófito Salvinia
This study presents an inventory of the ichthyofauna of the lower Roosevelt River sub-basin and i... more This study presents an inventory of the ichthyofauna of the lower Roosevelt River sub-basin and its associated tributaries. Fish sampling with fishing nets and measurements of environmental parameters of water occurred in November/2012 (rising water), February/2013 (flooding), May/2013 (falling water) and August/2013 (drought). Depth mean was 8.86 m, water transparency was 0.6 m, conductivity was 22.7 μS.cm-1 , pH was 6.59, dissolved oxygen was 7.63 mg.l-1 and temperature was 28°C. The total estimated capture area was 68,829.6 m 2 during 2,880 hours. The catch per unit Effort (CPUE) was 0.37 individuals m-2 .day-1. Species were spatially aggregated in all sampling points and river water levels. A total of 5,183 individuals distributed in 7 orders, 29 families, 104 genders and 188 species were sampled in this survey. The diversity index was 4.121 and equitability index was 0.789. The Characiforms order was the most abundant with 106 species, followed by Siluriforms with 63 species and Cichliforms with 23 species. The most abundant species was Serrasalmus rhombeus (Linnaeus, 1766) with 327 individuals (5.9%), followed by Chalceus epakros (Cope, 1870) with 309 individuals (5.6%) and Acestrorhynchus microlepis (Schomburgk, 1841) with 250 individuals (4.5%). Trophicity was characterized by omnivorous (28.6%), piscivorous (14.3%), carnivorous (13.8%) and detritivorous (12.8%). According to IBAMA's regulation, 29.25% of captured species presents ornamental potential. Levantamento de espécies de peixes do Baixo Rio Roosevelt, Sudoeste da Bacia Amazônica Resumo: Este estudo apresenta um inventário da ictiofauna da sub-bacia do baixo Rio Roosevelt e seus tributários associados. As coletas de peixes com malhadeiras e as medições de parâmetros ambientais da água ocorreram em Novembro/2012 (enchente), Fevereiro/2013 (cheia), Maio/2013 (vazante) e Agosto/2013 (seca). A média da profundidade foi 8,86 m, da transparência da água foi 0,6 m, da condutividade foi 22,7 μS.cm-1 , do pH foi 6,59, do oxigênio dissolvido foi 7,63 mg.l-1 e da temperatura da água foi 28°C. A área total de captura estimada foi 68.829,6 m 2 durante 2880 horas. A captura por unidade de esforço (CPUE) foi 0,37 indivíduos m-2 .dia-1. As espécies foram espacialmente agregadas em todos os pontos de coleta e períodos de coleta. Um total de 5183 peixes em 7 ordens, 29 famílias, 104 gêneros e 188 espécies foram coletados. O índice de diversidade foi 4,121 e o índice de equidade foi 0,789. As ordens Characiforme, Siluriforme e Cichliforme foram as mais abundantes. As espécies Serrasalmus rhombeus Linnaeus 1766 com 327 indivíduos (5,9%), Chalceus epakros (Cope 1870) com 309 indivíduos (5,6%) e Acestrorhynchus microlepis Schomburgk 1841 com 250 indivíduos (4,5%) foram as mais abundantes. Os onívoros (28,6%), piscívoros (14,3%), carnívoros (13,8%) e detritívoros (12,8%) foram os indivíduos mais abundantes. De acordo com o IBAMA, 29,25% das espécies capturadas tem potencial ornamental. Palavras-chave: Ictiofauna; Inventário; Biodiversidade; Bacia do Rio Madeira.
Resumo Coleções biológicas representam fonte crucial para estratégias de atuação governamental. T... more Resumo Coleções biológicas representam fonte crucial para estratégias de atuação governamental. Tratam-se de depósitos de organismos que, são, ou foram, encontrados em sistemas naturais. Sua importância propaga-se desde pesquisas científicas abordando evolução, sistemática, filogenia e ecologia, objetivando fornecimento de dados utilizados para formular estratégias conservacionistas estendendo-se às práticas de ensino, entre outras, com implicações em todos os níveis da sociedade. O presente estudo visou desenvolver habilidades e competências dos conteúdos teóricos e práticos sobre coleções biológicas explorando a ictiofauna regional a fim de criar-se protocolos e procedimentos adequados a esta prática que pudessem ser reproduzidos facilitando a gestão e organização de dados. Abstract Biological collections represent crucial source for government action strategies, these are deposits of organisms that are or have been found in natural systems. Its importance propagates from scientific research addressing evolution, systematics, phylogeny and ecology, to provide data used to formulate conservation strategies extending to teaching practices, among others, with implications at all levels of society. The study aimed to develop skills and competencies of the theoretical and practical content of biological collections exploring the regional fish fauna in order to create up protocols and procedures to this practice that could be played facilitating the management and organization of data.
Resumo O desflorestamento de áreas protegidas na Amazônia implica em uma série de fatores socioam... more Resumo O desflorestamento de áreas protegidas na Amazônia implica em uma série de fatores socioambientais deletérios, dentre os quais destacam-se conflitos sociais, empobrecimento da biodiversidade, degradação do solo, comprometimento de bacias hidrográficas, além dos serviços ambientais oferecidos, que ainda hoje não são considerados em estudos de impactos ambientais e quando estudados, não são valorados economicamente ou acabam por ser subdimensionados, implicando em perdas de oportunidades econômicas associadas ao uso sustentável de recursos naturais e de áreas de interesse para a conservação. Este estudo buscou apontar atividades ilícitas no interior e entorno da área especial de proteção ambiental (APA) Rio Madeira em Rondônia de acordo com o disposto no Termo de Referência, Nº 001/CAO-AMB/MP/2006, com ação e apoio dos órgãos interinstitucionais BPM/PM, SEDAM, SIPAM, INCRA, IBAMA e EMBRAGEO para que se pudesse entender a dinâmica do desflorestamento em unidades de conservação e terras indígenas do estado. Observou-se que a presença de áreas de assentamento, fazendas, perímetro urbano de Porto Velho e a hidrelétrica de Sando Antônio no entorno da APA Rio Madeira, têm influenciado na perda de cobertura vegetal desta. Também podem influenciar mudanças na dinâmica do ecossistema da UC e presença de espécies animais e vegetais.
The deforestation of protected areas in Brazil, especially in the Amazon, has triggered a series ... more The deforestation of protected areas in Brazil, especially in the Amazon, has triggered a series of deleterious socio-environmental factors. Among the most well-known are social conflicts, impoverishment of biodiversity, soil degradation, commitment and generation of pollution sources in watersheds, as well as the environmental services offered, which are not yet considered in studies of environmental impacts and when studied, are not valued economically or end up being undersized, implying loss of economic opportunities associated with the sustainable use of natural resources and areas of conservation interest. This study aimed to characterize the activities that are not in compliance with the legislation foreseen in the National System of Conservation Units (SNUC), inside and around the special area of the State Forest of Sustained Income (FERS) Araras, in the state of Rondônia. Using Landast image, it was found that in 1998 when the FERS was created 100% of the unit was intact. Approximately a decade later with 18% of the vegetation cover of the unit suppressed and later in 2016 the area where the area was with about 70% of its native cover removed. The study showed that temporary and disordered occupation leads to the suppression of vegetation cover of areas important for the maintenance of biodiversity and environmental services, causing the creation of Conservation Units to lose their true purpose.
The Digital Elevation Model (MDE) describes the configuration of the topography of the terrestria... more The Digital Elevation Model (MDE) describes the configuration of the topography of the terrestrial surface, allowing to derive this product in contours, slope, direction of flow, drainage, slope exposure and solar energy incidence and guides the delimitation of watersheds. Different ways of obtaining models are proposed and MDE SRTM (Shuttle Radar Topography Mission) is widely used with applications in various regions of the world. In southern Amazonia, in the middle course of the Madeira River, the configuration of transition between natural formations of savanna vegetation and dense forest predominates. The canopy of dense vegetation associated with a relief with little altitudinal variation can create a canopy effect, reflecting the microwave radiation emitted by the Space Bus Endeavor, which mapped 80% of the planet's surface in February 2000, influencing abrupt variations of Altitude recorded in the MDE-SRTM. GPS points associated to digitized coordinates of topographic charts were interpolated using the Kriging method and variogram adjustment for the KRIG MDE that represents this transition region between savanna and forest. The MDE SRTM and MDE KRIG are analyzed in this paper, and the main results show that the MDE SRTM distinguishes the two major vegetation (Dense Forest and Savannah) in shades of gray and by whole dimensions. The MDE KRIG presented better representation of the relief with respect to SRTM for the generation of contour lines and delimitation of the basin in this transition region between savannah and forest in tabular formation of sedimentary terraces.
Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair ar... more Mercury is a major pollutant in the Amazon River system, and its levels in fish and human hair are usually above the limit recommended by health agencies. The objective of this study was to analyze the methylmercury (MeHg) concentration in fish tissue from the Roosevelt River. The river's water velocity, depth, pH, temperature, electrical conductivity, dissolved oxygen and substrate type were measured, and fifty specimens distributed in 14 fish species were collected. A total of 64.3% of the sampled species were of the order Characiform and 71.4% of the species were carnivores. Fifty percent of the species had MeHg concentrations above threshold limit (Hg-T 0.5 mg kg-1) established for food by the World Health Organization. Cichla monoculus had the highest value of MeHg (2.45 mg kg-1). The MeHg concentration in fish varied according to dietary habits. The study also found bioaccumulation of MeHg in fish tissue in the following descending order: carnivorous > detritivorous > frugivore. Low significant correlations were found between fish weight or length and MeHg. Further studies on MeHg contamination are recommended in tissues of fish consumed in human riverine communities in the Roosevelt River Basin. Bioacumulação de metilmercúrio em tecidos de peixes no rio Roosevelt, Sudoeste da Bacia Amazônica RESUMO O mercúrio tem sido um dos principais poluentes no sistema do rio Amazonas, cujos níveis em peixes e cabelo humano são geralmente acima dos limites recomendados pelos órgãos de saúde. O objetivo deste estudo foi analisar a concentração de metilmercúrio (MeHg) em tecidos de peixes do rio Roosevelt. Os atributos medidos do rio foram a velocidade da água, profundidade, pH, temperatura, condutividade elétrica, oxigênio dissolvido, e profundidade. Cinquenta espécimes distribuídas em 14 espécies de peixes foram coletadas. A ordem Characiformes representou 64,3% das espécies amostradas e os carnívoros representaram 71,4%. Cinquenta por cento das espécies apresentaram concentrações de MeHg acima do limite (Hg-T 0,5 mg kg-1) estabelecido para os alimentos pela Organização Mundial de Saúde. Cichla monoculus apresentou o maior valor de MeHg (2,45 mg kg-1). A concentração de MeHg variou por hábitos alimentares. Este estudo demonstrou bioacumulação de MeHg em tecidos de peixes, como segue: carnívoros > detritívoros > frugívoros. Baixas correlações entre peso ou cumprimento de peixe e MeHg foram encontradas. Recomenda-se um estudo mais aprofundado de contaminação do MeHg em tecidos de peixes consumidos nas comunidades ribeirinhas na bacia do rio Roosevelt. Palavras-chave: biomagnificação, contaminação química, poluição aquática.
People never ate much fish or depended so heavily on the sector for their welfare as they do toda... more People never ate much fish or depended so heavily on the sector for their welfare as they do today. The world consumption of fish per capita increased from 9.9 kg in 1960 to 19.2 kg in 2012. However, Brazil accounted for only 0.86% of world fish production in 2009. The North Region led the setting of fishing continental extraction (54.6%) driven by Amazonas and Pará states in 2009, but came in last place in the continental aquaculture production (10.61%) driven by Amazonas and Rondônia states. Thus, the objective of this study was to understand fish farming in the state of Rondônia in 2009 with data from a questionnaire applied to producers about area in hectares of fish farming, the number of fish stocked, and production in tons. The state of Rondônia produced 11,455.67 tons of fish in fish farming in 2009. Porto Velho was the site with one of the smaller areas and lower production of fish farming, but had the highest stocking density; while Mirante da Serra was the municipality with the largest area and highest production of fish farming, but had one of the lowest stocking densities. On the other hand, Colorado do Oeste was the site that had the highest density storage with smaller area, but its aquaculture production was intermediate compared with other municipalities. The fish farming industry is favored in Rondônia because of the high amount of fish intake in the North region and favorable conditions of production of aquatic organisms. However, it is crucial investments and incentives through public policies to increase the supply and consumption of this food in Brazil, as well as the maintenance of the intake pattern in the North and Northeast Regions.
The 8th EUROPT Workshop on Advances in Continuous Optimization was hosted by the University of Av... more The 8th EUROPT Workshop on Advances in Continuous Optimization was hosted by the University of Aveiro, Portugal. Workshop started with a Welcome Reception of the participants on July 8, followed by two working days, July 9 and July 10. This Workshop ...
Uploads
Papers by M. Anjos