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Seasonal dynamics of a drosophilid (Diptera) assemblage and its potencial as bioindicator in open environments

BIZZO, Luis; GOTTSCHALK, Marco S.; TONI, Daniela C. De; HOFMANN, Paulo R. P.
Fonte: FUNDACAO ZOOBOTANICA RIO GRANDE SUL, MUSEU CIENCIAS NATURAIS Publicador: FUNDACAO ZOOBOTANICA RIO GRANDE SUL, MUSEU CIENCIAS NATURAIS
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
27.18%
Drosophila Fallen, 1823 (Diptera, Drosophilidae) is for long a well-established model organism for genetics and evolutionary research. The ecology of these flies, however, has only recently been better studied. Recent papers show that Drosophila assemblies can be used as bioindicators of forested environment degradation. In this work the bioindicator potential of drosophilids was evaluated in a naturally opened environment, a coastal strand-forest (restinga). Data from nine consecutive seasonal collections revealed strong temporal fluctuation pattern of the majority of Drosophila species groups. Drosophila willistoni group was more abundant at autumns, whereas D. cardini and D. tripunctata groups were, respectively, expressive at winters and springs, and D. repleta group at both seasons. The exotic species D. simulans Sturtevant, 1919 (from D. melanogaster group) and Zaprionus indianus Gupta, 1970 were most abundant at summers. Overall, the assemblage structure did not show the same characteristics of forested or urban environments, but was similar to the forests at winters and to cities at summers. This raises the question that this locality may already been under urbanization impact. Also, this can be interpreted as an easily invaded site for exotic species...

Evaluating the use of predatory insects as bioindicators of metals contamination due to sugarcane cultivation in neotropical streams

CORBI, Juliano Jose; FROEHLICH, Claudio Gilberto; TRIVINHO-STRIXINO, Susana; SANTOS, Ademir dos
Fonte: SPRINGER Publicador: SPRINGER
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
27.18%
Streams located in areas of sugarcane cultivation receive high concentrations of metal ions from soils of the adjacent areas causing accumulation of metals in the aquatic sediment. This impact results in environmental problems and leads to bioaccumulation of metal ions in aquatic organisms. In the present study, metal concentrations in different predatory insects were studied in streams near sugarcane cultivation and compared to reference sites. Possible utilisation of predatory insects as bioindicators of metal contamination due to sugarcane cultivation from 13 neotropical streams was evaluated. Ion concentrations of Al, Cd, Cr, Cu, Zn, Fe, and Mn in adult Belostomatidae (Hemiptera) and in larvae of Libellulidae (Odonata) were analysed. Nine streams are located in areas with sugarcane cultivation, without riparian vegetation (classified as impacted area) and four streams were located in forested areas (reference sites). Metal concentrations in insects were higher near sugarcane cultivations than in control sites. Cluster analysis, complemented by an ANOSIM test, clearly showed that these insect groups are good potential bioindicators of metal contamination in streams located in areas with sugarcane cultivation and can be used in monitoring programmes. We also conclude that Libellulidae appeared to accumulate higher concentrations of metals than Belostomatidae.; FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)[06/61400-2]

"Bioindicadores vegetais de poluição atmosférica: uma contribuição para a saúde da comunidade" ; Vegetal bioindicators of atmospheric pollution: a contribution to community health

Carneiro, Regina Maria Alves
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 11/08/2004 PT
Relevância na Pesquisa
27.35%
A qualidade do ar nas áreas urbanas e industriais tende a apresentar concentrações indesejáveis de contaminantes, sem que haja um sistema abrangente de monitoramento, dada a sofisticação dos métodos físico-químicos convencionais, que requerem custos elevados de implantação, operação e manutenção, custos estes, que podem ser minimizados pela adoção de metodologia complementar de biomonitoramento. O biomonitoramento é um método experimental que permite avaliar a resposta de organismos vivos à poluição, oferecendo vantagens como: custos reduzidos, eficiência para o monitoramento de áreas amplas e por longos períodos de tempo e, também, avaliação de elementos químicos em baixas concentrações ambientais. As medidas e registros efetuados por redes convencionais de monitoramento da qualidade do ar permitem verificar se normas e limites estabelecidos ou recomendados pela legislação, agências ambientais e órgãos de promoção da saúde humana estão sendo respeitados. Entretanto, tais medições não permitem conclusões imediatas sobre as conseqüências de poluentes nos seres vivos. Assim, o biomonitoramento deve ser considerado como um método complementar na análise de poluentes, podendo constituir-se em um terceiro sistema de informações...

Utilização de líquens como bioindicadores de contaminação atmosférica por radionuclídeos naturais e metais em região impactada por TENORM; The use of lichens as bioindicators of atmospheric contamination by natural radionuclides and metals in a region impacted by TENORM

Leonardo, Lucio
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/06/2010 PT
Relevância na Pesquisa
37.18%
Este trabalho objetivou estudar a possibilidade de se utilizar líquen como bioindicador de poluição atmosférica para regiões impactadas por radionuclídeos, metais e elementos terras raras. Foram escolhidas como áreas de estudo a região de Pirapora do Bom Jesus, onde se localiza uma indústria de produção de estanho e chumbo metálicos e a região de Cubatão, onde se localiza o complexo industrial de produção de fertilizantes fosfatados. As duas instalações escolhidas são consideradas como indústrias TENORM - Technologically Enhanced Naturally Occurring Radioactive Material, pois podem ocasionar um aumento significativo na concentração dos radionuclídeos naturais nas várias etapas do processo industrial, ocasionando um aumento potencial de exposição à radiação natural em produtos, subprodutos e resíduos gerados. Para tanto foram analisados os radionuclídeos 238U, 226Ra, 210Pb, 232Th e 228Ra, os elementos terras raras e metais em amostras de matéria prima e resíduo das instalações, liquens e solos na área de influência. As amostras de líquen e solo foram analisadas para a determinação de urânio, tório, elementos terras raras e metais por análise por ativação com nêutrons. Os radionuclídeos 226Ra...

Influência do desenvolvimento florestal sobre a comunidade edáfico-epígea de Arthropoda e a mirmecofauna: bases para a bioindicação do processo sucessional na restauração ecológica; The influence of forest development on edaphic and epigeic Arthropod communities and ant fauna: bases for bioindicantion of successional process in ecological restoration

Meloni, Fernando
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 26/10/2012 PT
Relevância na Pesquisa
27.46%
A restauração ecológica visa o estabelecimento de ecossistemas semelhantes aos que originalmente ocupavam uma determinada área que foi degradada. Todavia, os resultados dos esforços envolvidos na restauração e no retorno dos processos ecológicos naturais são difíceis de serem medidos, pois faltam métodos apropriados. Os bioindicadores são ferramentas baratas e confiáveis para o diagnóstico das características ambientais e ecológicas, cujo princípio consiste em medidas simples de grupos biológicos especialmente sensíveis às mudanças no meio. Os Arthropoda que ocorrem no solo e na serapilheira, em especial as formigas, mediam processos ecológicos importantes e apresentam características que os tornam bioindicadores potenciais, mas seu uso ainda necessita de conhecimentos específicos. Assim, o presente estudo teve como objetivo testar o potencial indicador da comunidade de Arthropoda edáfico-epígea na restauração ecológica, com maior enfoque sobre as formigas. Foram avaliadas as comunidades de um gradiente sucessional formado por doze reflorestamentos com diferentes idades e três remanescentes florestais, localizados nas bacias dos rios Pardo e Mogi-Guaçu. O objetivo foi identificar quais os parâmetros que melhor refletem a resposta dessas comunidades ao desenvolvimento florestal. Os resultados indicaram que tanto a mirmecofauna como o restante da comunidade são influenciadas pelos estádios de desenvolvimento florestal. As comunidades variaram em composição e estrutura. A evolução das comunidades mostrou-se direcional...

Estudo de Tilápias do Nilo (Oreochromis niloticus) como bioindicadores da poluição por mercúrio nos lagos do Parque Ibirapuera e do Parque Ecológico do Tietê na Grande São Paulo; Study on Nile Tilapia (Oreochromis niloticus) as mercury pollution bioindicators at Parque Ibirapuera and Parque Ecológico do Tietê lakes at Greater São Paulo

Carretero, Maria Eugenia
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/12/2012 PT
Relevância na Pesquisa
27.18%
A Grande São Paulo, composta por 39 municípios, apresenta crescimento urbano e industrial expoente que contribuem para o constante acúmulo de poluentes no ambiente. Ainda assim, exibe áreas verdes remanescentes que contribuem para a sustentabilidade ambiental da cidade, como por exemplo, o Parque Ibirapuera e o Parque Ecológico do Tietê. Nesse contexto, o presente estudo visa verificar a viabilidade em utilizar as O. niloticus como bioindicadoras da poluição por mercúrio no ecossistema aquático dos dois parques da Grande São Paulo. Obteram-se para as tilápias do Nilo do Parque Ibirapuera pertencentes aos pontos de coleta A, B e C durante o inverno as respectivas concentrações de mercúrio total no sangue 2,72±4,20µg/L, 2,45±1,90µg/L e 1,19±0,05µg/L e, no hepatopâncreas as respectivas concentrações de mercúrio de 0,07±0,02 µg/g, 0,06 ±0,005 µg/g e 0,16 ±0,07 µg/g. No verão as tilápias do Parque Ibirapuera apresentaram nos mesmos pontos de coleta as respectivas concentrações de mercúrio total no sangue 2,50±0,84µg/L, 2,67±1,03µg/L e 2,430±0,790µg/L e, no hepatopâncreas as respectivas concentrações de mercúrio de 0,08 ±0,03 µg/L, 0,16 ±0...

Evaluating the use of predatory insects as bioindicators of metals contamination due to sugarcane cultivation in neotropical streams

Corbi, Juliano Jose; Froehlich, Claudio Gilberto; Trivinho-Strixino, Susana; dos Santos, Ademir
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica Formato: 545-554
ENG
Relevância na Pesquisa
27.18%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 06/61400-2; Streams located in areas of sugarcane cultivation receive high concentrations of metal ions from soils of the adjacent areas causing accumulation of metals in the aquatic sediment. This impact results in environmental problems and leads to bioaccumulation of metal ions in aquatic organisms. In the present study, metal concentrations in different predatory insects were studied in streams near sugarcane cultivation and compared to reference sites. Possible utilisation of predatory insects as bioindicators of metal contamination due to sugarcane cultivation from 13 neotropical streams was evaluated. Ion concentrations of Al, Cd, Cr, Cu, Zn, Fe, and Mn in adult Belostomatidae (Hemiptera) and in larvae of Libellulidae (Odonata) were analysed. Nine streams are located in areas with sugarcane cultivation, without riparian vegetation (classified as impacted area) and four streams were located in forested areas (reference sites). Metal concentrations in insects were higher near sugarcane cultivations than in control sites. Cluster analysis, complemented by an ANOSIM test, clearly showed that these insect groups are good potential bioindicators of metal contamination in streams located in areas with sugarcane cultivation and can be used in monitoring programmes. We also conclude that Libellulidae appeared to accumulate higher concentrations of metals than Belostomatidae.

Bioindicators as a tool for monitoring and control biofilm reactors : a simplified approach

Coutinho, L.; Salas, J. J.; Nogueira, R.; Brito, A. G.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em 11/11/2007 ENG
Relevância na Pesquisa
37.18%
The control of wastewater treatment plants requires an extensive monitoring programme based on physicochemical costly routine analysis. Microbial populations are well known indicators of operational conditions in biological reactors. This research was carried out by the CENTA and the University of Minho in the scope of the Erasmus programme. The aim of the work was the development of a simplified approach, based on biological indicators, for monitoring small biofilm wastewater treatment processes. In that regard, protozoa and metazoan were monitored at CENTA experimental plants - namely a trickling filter and a rotating biological contactor -, and correlated with influent wastewater and effluent composition. The relationship between wastewater performance and the microbiological composition of the biofilm was identified and assessed. Results indicate that a methodology based on the bioindicators provides useful data for process monitoring and control of small wastewater treatment plants, thus diminishing the associated costs of routine analysis and providing information when such analysis aren’t easily available.

Macroinvertebrates and fishes as biomonitors of heavy metal concentration in the Seixal Bay (Tagus estuary): Which species perform better?

Caçador, I.; Costa, J.L.; Duarte, B.; Silva, G.; Medeiros, J.P.; Azeda, C.; Castro, N.; Freitas, J.; Pedro, S.; Almeida, Pedro R.; Cabral, H.; Costa, M.J.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
27.18%
The present study aims to evaluate the utilization of several benthic macroinvertebrate and fish species as bioindicators of heavy metal contamination in a relatively enclosed estuarine area, the Seixal Bay (Tagus estuary, Portugal). 266 specimens of 16 taxa were captured during four sampling campaigns and the concentration of lead, chromium, nickel, copper, zinc, cobalt and cadmium were quantified in fish muscle and whole soft body of the invertebrates, as well as in suspended particulate matter in the water column and sediments. Larger predator fishes with higher mobility presented low levels of contamination, probably due to their feedings sites being located outside the bay in less contaminated areas. The species of the Gobiidae family, Pomatoschistus microps, Pomatoschistus minutus and Gobius niger presented higher values of non-metabolic elements (Pb, Ni and Cd) while Scrobicularia plana, Nereis diversicolor, Carcinus maenas and Palaemon serratus were more associated to the accumulation of Cu, Cr and Zn. Nephtys hombergii and Crangon crangon, showed intermediate concentrations of all metals. These results points out to a future possible utilization of S. plana, N. diversicolor, P. serratus and C. maenas and of Pomatoschistus species as bioindicators of heavy metal contamination in ecological quality monitoring programs.

Bioindicators of erosive dynamics in beach and dune systems in the portuguese mainland coast

Martins, Mónica C.; Neto, Carlos; Gutierres, Francisco; Costa, José Carlos
Fonte: Societé Française de Phytosociologie Publicador: Societé Française de Phytosociologie
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
27.18%
The litoral psammophilic ecosystems are organized according gradients leaning from the sea to interior areas, including a succession of phytosociological associations, correspondent to well discriminate biotopes, according their geomorphologic, soil and ecological characteristics. In the stable sandy shores (in terms of erosion balance), the different communities occupy relatively wide zonal tracks, with clear transitions. However, in situations of beach downwasting and coastline retreat, the mobile sands tend to advance inland, often compressing the zonal gradient, and distinct communities tend to overlap. Since the herbaceous hemicryptophitic flora typical from the beach and instable dunes has intrinsic colonization skills, high tolerance (or even preference) to burial, and elevated growing rates, it can quickly adapt to the instability of the topographic surface, accompanying its movement to the interior. Yet, the growing rates of the woody chamaephitic vegetation, characteristic of the more interior and relatively stable dune (gray dune) are slower, in addition to a lower capability to resist to burial. Thus, sea advance and inherent sands mobility inland, combined with the dissimilar resilience of plant associations...

Seasonal dynamics of a drosophilid (Diptera) assemblage and its potencial as bioindicator in open environments

Bizzo,Luís; Gottschalk,Marco S; Toni,Daniela C. De; Hofmann,Paulo R. P
Fonte: Fundação Zoobotânica do Rio Grande do Sul Publicador: Fundação Zoobotânica do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2010 EN
Relevância na Pesquisa
27.18%
Drosophila Fallen, 1823 (Diptera, Drosophilidae) is for long a well-established model organism for genetics and evolutionary research. The ecology of these flies, however, has only recently been better studied. Recent papers show that Drosophila assemblies can be used as bioindicators of forested environment degradation. In this work the bioindicator potential of drosophilids was evaluated in a naturally opened environment, a coastal strand-forest (restinga). Data from nine consecutive seasonal collections revealed strong temporal fluctuation pattern of the majority of Drosophila species groups. Drosophila willistoni group was more abundant at autumns, whereas D. cardini and D. tripunctata groups were, respectively, expressive at winters and springs, and D. repleta group at both seasons. The exotic species D. simulans Sturtevant, 1919 (from D. melanogaster group) and Zaprionus indianus Gupta, 1970 were most abundant at summers. Overall, the assemblage structure did not show the same characteristics of forested or urban environments, but was similar to the forests at winters and to cities at summers. This raises the question that this locality may already been under urbanization impact. Also, this can be interpreted as an easily invaded site for exotic species...

Bioindicators in radiation protection

Amaral,Ademir; Fernandes,Thiago Salazar; Cavalcanti,Mariana Brayner
Fonte: Instituto de Tecnologia do Paraná - Tecpar Publicador: Instituto de Tecnologia do Paraná - Tecpar
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2008 EN
Relevância na Pesquisa
37.35%
Biodosimetry is the evaluation of absorbed dose using bioindicators. Among chromosomal aberrations, scoring of dicentrics from peripheral human blood has been used as gold standard for biodosimetry, although in case of large scale incidents its use presents some drawbacks. Advances in technology have led to new investigations allowing or permitting the use of new methods which not only improve this "classical" biodosimetry but permits the design of other bioindicators making possible faster analyses, particularly in events where many persons may have been exposed. This report presents an overview of some recent studies developed by the "Grupo de Estudos em Radioproteção e Radioecologia - GERAR", Nuclear Energy Department of UFPE - Brazil, involving biodosimetry.

Searching for bioindicators of forest fragmentation: passerine birds in the Atlantic forest of southeastern Brazil

Piratelli,A.; Sousa,SD.; Corrêa,JS.; Andrade,VA.; Ribeiro,RY.; Avelar,LH.; Oliveira,EF.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/05/2008 EN
Relevância na Pesquisa
37.35%
Aiming to evaluate the potential of Passerine birds as bioindicators of forest fragmentation, we studied the avifauna in the mountain region of the state of Rio de Janeiro by mist-netting between 2001 and 2005. We sampled six sites, including four small fragments (from 4 to 64 ha) in an agricultural area (Teresópolis), one second-growth forest (440 ha - Miguel Pereira) and a continuous forest (10,600 ha, Serra dos Órgãos National Park - SONP). Indicator Species analysis and a Monte Carlo test were run to detect associations between species and sites, considering at least 30% of perfect indication and a significant value for the statistical test, only considering species with at least 10 captures. A total of 30 Passerine birds were sampled, and due to their association to the largest area (SONP), we considered Sclerurus scansor, Mionectes rufiventris, Chiroxiphia caudata and Habia rubica as the best indicators for this area. Five species were more captured not by chance in the 440 ha second-growth: Conopophaga melanops, Myiobius barbatus, Myrmeciza loricata, Philydor atricapillus and Schiffornis virescens and no species were related to any small fragment. This analysis has identified specialized Passerine species in many aspects (foraging substract...

Chrysomelidae (insecta/coleoptera) como biondicadores de qualidade ambiental em áreas de Cerrado no estado de Goiás -Brasil; Bioindicators Chrysomelidae ( INSECTA/COLEOPTERA) enviromental quality in cerrado vegetacion in central Brazil

PIMENTA, Mayra
Fonte: Universidade Federal de Goiás; BR; UFG; Doutorado em Ciencias Ambientais; Ciências Agrárias Publicador: Universidade Federal de Goiás; BR; UFG; Doutorado em Ciencias Ambientais; Ciências Agrárias
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
27.18%
Knowledge of the composition of natural communities and their responses to anthropogenic alterations is essential for determining the conservation status of a given system and prioritizing management actions. Anthropogenic impacts could cause a reduction in biodiversity not only due to habitat loss, but also due the loss of habitat heterogeneity across given landscape, especially in systems characterized by a mosaic of different elements (e.g. the Cerrado vegetation in central Brazil). Here we evaluate leaf beetle Coleoptera/Chrysomelidae) as bioindicators in a system whith varying intensities of human impacts and different phyto-physionomies (from open field to forests). We collected 1117 leaf beetle belonging to 245 species, of which 12 species and 5 genus were considered possible bioindicators based on IndVal measure. Higher species richness was observed in forests and regenerating fields, and habitats with lower species richness included pastures, mines and veredas. Only the Eucalyptus areas had a high abundance of Chrysomelidae, followed by forests and the other habitats, which were not significantly different from each other. Natural fields, regenerating fields, natural cerrados and forest had higher values of β-diversity. In general...

Larvas de Odonata como bioindicadores de qualidade ambiental de cursos d’água no cerrado; Odonata larvae as bioindicators of environmental quality of Cerrado watercourses

Gonçalves, Regina Célia
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
POR
Relevância na Pesquisa
27.35%
O monitoramento biológico tem sido apresentado como um método eficaz na determinação da qualidade da água, pois utiliza a estrutura de comunidades como um indicador do grau de poluição. Dentre os grupos de invertebrados que têm sido utilizados como bioindicadores, destacam-se os insetos da ordem Odonata. Esses insetos possuem a fase larval aquática e a adulta aérea, estão presentes nos mais diversos ambientes, desde rios, riachos e lagos, até poças temporárias ou brejos. Em ambientes aquáticos associados ao Cerrado ainda é bastante restrito o número de trabalhos realizados com macroinvertebrados, principalmente com Odonata. O objetivo geral deste estudo foi avaliar o potencial de larvas de Odonata como bioindicadores da qualidade de cursos d’água de Cerrado, testando as seguintes hipóteses: i) existe correspondência entre os parâmetros descritores das assembleias (riqueza e diversidade) de Odonata e índices de integridade ambiental relacionados às características da água e estrutura do habitat e, ii) fatores abióticos, como pH, temperatura, oxigênio dissolvido, dentre outros são determinantes para a presença de determinados gêneros de Odonata nos corpos d’água. O estudo foi realizado em 12 cursos d’água localizados nos municípios de Uberlândia e Uberaba e apresentando diferentes níveis de conservação. Para a avaliação da qualidade das águas...

Crescimento de plantas de arroz sob aplica????o de herbicidas do grupo das imidazolinonas e sua atividade residual em plantas bioindicadoras; Growth of rice plants under application of herbicides imidazolinone and its residual activity in bioindicators plants

SOUSA, Camila Pinho de
Fonte: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR Publicador: Universidade Federal de Pelotas; Biologia; Programa de P??s-Gradua????o em Fisiologia Vegetal; UFPel; BR
Tipo: Dissertação Formato: application/pdf
POR
Relevância na Pesquisa
27.35%
The objective of this research was: a) evaluate the effect of imidazolinone chemical group herbicides on the growth of plants and the injuries to the photosynthetic apparatus of three rice types (varieties) exposed to these and b) evaluate the effect of soil residual herbicides imazethapyr+ imazapic on corn, cucumber, radish and tomato are used as bioindicators. At first experiments we used the herbicide Only?? and Kifix??, using a randomized split plot design in a factorial 5x3 with six replications, with the first factor rates corresponded to 0, 5, 10, 15 and 20 mg p. c. m-2 of commercial product Only?? and 0, 7, 14, 21 and 28 mg p. c. m-2 of commercial product Kifix??, and factor B type of rice (cultivated rice cv. Puit?? Inta CL, red rice ecotype sensitive to herbicides Imidazolinone and red rice ecotype with suspected herbicide tolerance imidazolinone). We evaluated the parameters of chlorophyll a fluorescence, phytotoxicity, plant height and dry mass. Analysis of chlorophyll a fluorescence was performed using a portable fluorometer (HandyPEA, Hanstech). It was concluded that cv. Puit?? Inta CL is tolerant to herbicides Only?? and Kifix?? and can be used in the Clearfield?? system and the red rice ecotype with suspected tolerance was tolerant to both herbicides...

Optical Indices as Bioindicators of Forest Condition from Hyperspectral CASI data

Zarco-Tejada, Pablo J.; Miller, J. R.; Mohammed, G. H.; Noland, T. L.; Sampson, P. H.
Fonte: Conselho Superior de Investigações Científicas Publicador: Conselho Superior de Investigações Científicas
Tipo: Comunicación de congreso Formato: 68911 bytes; application/pdf
ENG
Relevância na Pesquisa
37.18%
In Remote Sensing in the 21st Century: Economic and Environmental Applications, Proceedings of the 19th EARSeL Symposium on Remote Sensing in the 21st Century, Valladolid (Spain), 31st May - 2nd June, 1999, Casanova (Ed.), Balkema, Rotterdam, pp. 517-522; This paper reports on progress made to link physiologically-based indicators to optical indices scaling-up from leaf level to the canopy through SAIL and Kuusk Canopy Reflectance Models (CR). Hyperspectral CASI data of 2m spatial resolution, 7.5 nm spectral resolution and 72 channels were collected in 1997 and 1998 deployments over twelve sites of Acer saccharum M. in the Algoma Region, Ontario (Canada). A field sampling campaign was carried out for biochemical analysis of leaf chlorophyll and carotenoid concentrations, and fluorescence along with leaf reflectance and transmittance. Leaf-level relationships obtained between optical indices and biochemical indicators were scaled-up to canopy level through CR models using input model parameters related to the canopy structure and viewing geometry at the time of data acquisition. The result is an algorithm which predicts leaf-level bioindicators from airborne hyperspectral imagery. A modeling study was carried out to determine the influence of CR parameters such as the Leaf Angle Distribution Function (LADF)...

Bioindicators of Forest Sustainability: Progress Report

Sampson, P. H.; Mohammed, G. H.; Colombo, S. J.; Noland, T. L.; Miller, J. R.; Zarco-Tejada, Pablo J.
Fonte: Ontario Ministry of Natural Resources Publicador: Ontario Ministry of Natural Resources
Tipo: Capítulo de libro Formato: 2777840 bytes; application/pdf
Relevância na Pesquisa
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Measurable indicators are needed to gauge the effects of management activities and natural phenomena on forest sustainability. To meet this need, the Bioindicators of Forest Sustainability Project is testing physiological approaches to develop a Forest Condition Rating (FCR) system. An FCR system would directly support provincial policy (e.g., Forest Resource Assessment Policy) and national initiatives (e.g., Criteria and Indicators) by providing an understanding of ecosystem condition. Furthermore, this project addresses a pressing need for indicators that can support operational forest management and possible concerns of sustainability at the local level. Development of an FCR system involves interpreting remotely sensed spectral information with the aid of ground-based assessments of structural and functional (i.e., physiological) aspects of forest condition. Analysis of this spectral information may reveal indicators of health across a wide range of tree species and ages. Current research activities include controlled laboratory studies, ground-based field assessments and acquisition of hyperspectral airborne data to develop gradients in key spectral features that correspond to actual differences in physiology. This report provides first-year progress results. Preliminary correlations in controlled experiments have been made between leaf-based spectral reflectance and physiological status. Compilation of a leaf-based spectral database has been initiated. The database shows the influence of species...

Bioindicators of climate and trophic state in lowland and highland aquatic ecosystems of the Northern Neotropics

Pérez,Liseth; Lorenschat,Julia; Massaferro,Julieta; Pailles,Christine; Sylvestre,Florence; Hollwedel,Werner; Brandorff,Gerd-Oltmann; Brenner,Mark; Gerald,Islebe; Lozano,María del Socorro; Scharf,Burkhard; Schwalb,Antje
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2013 EN
Relevância na Pesquisa
37.18%
Chironomids, diatoms and microcrustaceans that inhabit aquatic ecosystems of the Northern Neotropics are abundant and diverse. Some species are highly sensitive to changes in water chemical composition and trophic state. This study was undertaken as a first step in developing transfer functions to infer past environmental conditions in the Northern lowland Neotropics. Bioindicator species abundances were related to multiple environmental variables to exploit their use as environmental and paleoenvironmental indicators. We collected and analyzed water and surface sediment samples from 63 waterbodies located along a broad trophic state gradient and steep gradients of altitude (~0-1 560m.a.s.l.) and precipitation (~400-3 200mm/y), from NW Yucatán Peninsula (Mexico) to southern Guatemala. We related 14 limnological variables to relative abundances of 282 diatom species, 66 chironomid morphospecies, 51 species of cladocerans, 29 non-marine ostracode species and six freshwater calanoid copepods. Multivariate statistics indicated that bicarbonate is the strongest driver of chironomid and copepod distribution. Trophic state is the second most important factor that determines chironomid distribution. Conductivity, which is related to the precipitation gradient and marine influence on the Yucatán Peninsula...

Benthic foraminifera as bioindicators of anthropogenic impacts in two north African lagoons: a comparison with ostracod assemblages

Ruiz,Francisco; González-Regalado,María Luz; Galán,Emilio; González,María Isabel; Prudencio,María Isabel; Dias,María Isabel; Abad,Manuel; Toscano,Antonio; Prenda,José; Mara García,Edith Xio
Fonte: Instituto de Geología, UNAM Publicador: Instituto de Geología, UNAM
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 EN
Relevância na Pesquisa
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Numerous investigations have used the foraminiferal assemblages or species as bioindicators. This paper tests the responses of these microorganisms to different environmental changes (heavy metal pollution, treatment stations, artificial inlets, agricultural and urban sewages) and compares them to those observed previously on ostracod assemblages. Foraminifera are more tolerant to these changes, while ostracods present a more specialized response.