Consulta: subjectFacets:"Density"
Registros recuperados: 138
Data/hora: 03/06/2024 03:39:31

Densidad, uso y evaluación del hábitat y de la dieta del Romerolagus diazi en el Parque Nacional Izta-Popo, Zoquiapan y anexas.
Provedor de dados: 32
Autores: Martínez García, José Antonio.
Este estudio se desarrolló del invierno 2003-2004 al invierno del 2004-2005 en el Parque Nacional Izta-Popo, Zoquiapan y Anexas, en sitios con presencia de este conejo fueron denominados como Altzomoni (AL), El Pinar (EP), El Arco (EA), y El Papayo (PA) y tuvo como objetivos el estimar la densidad, el uso del hábitat, y evaluación del hábitat y de la dieta. Se estimó el tamaño poblacional, la densidad y la determinación del ámbito hogareño y cambios de éstas, bajo distintos tipos de unidades ambientales a lo largo del año. El uso de hábitat Este se determinó por medio de la selección de comunidades vegetales, porcentaje de cada uno de los componentes de la cobertura del hábitat, además se estableció el efecto de la perturbación del hábitat, ya sea por...
Palavras-chave: Romerolagus diazi; Densidad; Uso de hábitat; Perturbación; Dieta; Capacidad nutricional de carga; Density; Habitat use; Perturbation; Diet; Nutritional carrying capacity; Doctorado; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/426

Patrones de actividad y densidad del ocelote (Leopardus pardalis) en la reserva de la biosfera "Sierra del Abra Tanchipa", San Luis Potosí, México.
Provedor de dados: 32
Autores: Martínez Hernández, Abraham.
México cuenta con escasos estudios sobre el ocelote (Leopardus pardalis) a pesar de ser una especie en peligro de extinción. En el Estado de San Luis Potosí, se ha confirmado la presencia de poblaciones residentes y probablemente se encuentran en situación de riesgo debido a las intensas modificaciones del hábitat. Por esta razón es necesario generar información para conocer el estado actual de la población y para implementar estrategias efectivas de manejo para la conservación de esta especie en la región. El objetivo del estudio fue conocer la abundancia, densidad y los patrones de actividad del ocelote en la Reserva de la Biosfera Sierra del Abra Tanchipa, empleando un método de captura–recaptura con el uso de cámaras–trampa. El estudio se realizó de...
Palavras-chave: Leopardus pardalis; Cámaras-trampa; Abundancia; Densidad; Actividad; Camera-traps; Abundance; Density; Activity; Ganadería; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1909

Densidad, uso y evaluación del hábitat y de la dieta del Romerolagus diazi en el Parque Nacional Izta-Popo, Zoquiapan y anexas.
Provedor de dados: 32
Autores: Martínez García, José Antonio.
Este estudio se desarrolló del invierno 2003-2004 al invierno del 2004-2005 en el Parque Nacional Izta-Popo, Zoquiapan y Anexas, en sitios con presencia de este conejo fueron denominados como Altzomoni (AL), El Pinar (EP), El Arco (EA), y El Papayo (PA) y tuvo como objetivos el estimar la densidad, el uso del hábitat, y evaluación del hábitat y de la dieta. Se estimó el tamaño poblacional, la densidad y la determinación del ámbito hogareño y cambios de éstas, bajo distintos tipos de unidades ambientales a lo largo del año. El uso de hábitat Este se determinó por medio de la selección de comunidades vegetales, porcentaje de cada uno de los componentes de la cobertura del hábitat, además se estableció el efecto de la perturbación del hábitat, ya sea por...
Palavras-chave: Romerolagus diazi; Densidad; Uso de hábitat; Perturbación; Dieta; Capacidad nutricional de carga; Density; Habitat use; Perturbation; Diet; Nutritional carrying capacity; Doctorado; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/426

Densidad, uso y evaluación del hábitat y de la dieta del Romerolagus diazi en el Parque Nacional Izta-Popo, Zoquiapan y anexas.
Provedor de dados: 32
Autores: Martínez García, José Antonio.
Este estudio se desarrolló del invierno 2003-2004 al invierno del 2004-2005 en el Parque Nacional Izta-Popo, Zoquiapan y Anexas, en sitios con presencia de este conejo fueron denominados como Altzomoni (AL), El Pinar (EP), El Arco (EA), y El Papayo (PA) y tuvo como objetivos el estimar la densidad, el uso del hábitat, y evaluación del hábitat y de la dieta. Se estimó el tamaño poblacional, la densidad y la determinación del ámbito hogareño y cambios de éstas, bajo distintos tipos de unidades ambientales a lo largo del año. El uso de hábitat Este se determinó por medio de la selección de comunidades vegetales, porcentaje de cada uno de los componentes de la cobertura del hábitat, además se estableció el efecto de la perturbación del hábitat, ya sea por...
Palavras-chave: Romerolagus diazi; Densidad; Uso de hábitat; Perturbación; Dieta; Capacidad nutricional de carga; Density; Habitat use; Perturbation; Diet; Nutritional carrying capacity; Doctorado; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/426

Densidad, uso y evaluación del hábitat y de la dieta del Romerolagus diazi en el Parque Nacional Izta-Popo, Zoquiapan y anexas.
Provedor de dados: 32
Autores: Martínez García, José Antonio.
Este estudio se desarrolló del invierno 2003-2004 al invierno del 2004-2005 en el Parque Nacional Izta-Popo, Zoquiapan y Anexas, en sitios con presencia de este conejo fueron denominados como Altzomoni (AL), El Pinar (EP), El Arco (EA), y El Papayo (PA) y tuvo como objetivos el estimar la densidad, el uso del hábitat, y evaluación del hábitat y de la dieta. Se estimó el tamaño poblacional, la densidad y la determinación del ámbito hogareño y cambios de éstas, bajo distintos tipos de unidades ambientales a lo largo del año. El uso de hábitat Este se determinó por medio de la selección de comunidades vegetales, porcentaje de cada uno de los componentes de la cobertura del hábitat, además se estableció el efecto de la perturbación del hábitat, ya sea por...
Palavras-chave: Romerolagus diazi; Densidad; Uso de hábitat; Perturbación; Dieta; Capacidad nutricional de carga; Density; Habitat use; Perturbation; Diet; Nutritional carrying capacity; Doctorado; Ganadería.
Ano: 2011
URL: http://hdl.handle.net/10521/426

Road Zone Effects in Small-Mammal Communities
Provedor de dados: 7
Autores: Bissonette, John A.; USGS Utah Cooperative Fish and Wildlife Research Unit, Department of Wildlands Resources, College of Natural Resources, Utah State University; john.bissonette@usu.edu; Rosa, Silvia A.; USGS-Utah Cooperative Fish and Wildlife Research Unit, Department of Wildlands Resources, College of Natural Resources, Utah State University; silviarosa2007@gmail.com.
Our study focused on the putative effects of roads on small-mammal communities in a high desert region of southern Utah. Specifically, we tested whether or not roads create adjacent zones characterized by lower small- mammal densities, abundance, and diversity. We sampled abundance of small mammals at increasing distances from Interstate 15 during two summers. We recorded 11 genera and 13 species. We detected no clear abundance, density, or diversity effects relative to distance from the road. Only two of 13 species  were never captured near roads. The abundance of the remaining 11 small mammal species was either similar at different distances from the road or higher closer to the road. We conclude that although roads may act as barriers and possible...
Tipo: Peer-Reviewed Reports
Palavras-chave: Density; Desert; Habitat quality; Road ecology; Species abundance; Utah; Vertebrate abundance.
Ano: 2009

PHYSICAL-MECHANICAL CHARACTERIZATION OF Eucalyptus urophylla WOOD
Provedor de dados: 70
Autores: Lahr,Francisco A. R.; Nogueira,Marta C. De J. A.; Araujo,Victor A. De; Vasconcelos,Juliano S.; Christoforo,André L.
ABSTRACT: Eucalyptus urophylla consists in a wood-producing species, which offers a natural multiple raw material of good quality for applications in rural and civil constructions. However, Eucalyptus urophylla still has a small utilization as building parts and elements, resulting from the possible ignorance and low diffusion of its structural possibilities. Thereby, the present research aims to measure the main thirteen mechanical properties of Eucalyptus urophylla wood for two different moisture contents, 12% and 30% (green wood). Furthermore, in these two conditions of moisture content evaluation, volumetric mass densities were also evaluated. At the end of this evaluation, which included 2688 determinations, all the obtained results were statistically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Timor White Gum; Strength modulus; Cracking; Shear stress; Hardness; Density.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500900

Potato cultivar BRS F63 Camila has higher yield at lower plant spacing
Provedor de dados: 75
Autores: Eschemback,Vlandiney; Kawakami,Jackson; Genú,Aline M; Stroparo,Dioni.
ABSTRACT The plant management used in potato crop is usually similar across the main producing regions in Brazil. Same plant spacing are commonly used, despite the differences in climate and soil of the various potato planting areas. The objective of this work was to evaluate the yield of potato cultivars in response to different plant spacing. Experiments were conducted in the field, and the treatments consisted of three cultivars (Agata, BRS Clara and BRS F63 Camila) and three plant spacing (20, 25 and 30 cm) in randomized blocks with three repetitions in two years. The total, marketable and non-marketable tuber yield, total and marketable number of tubers per area and size class, mean total and marketable tuber weight and percentage of tuber dry weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum tuberosum; Agata; BRS Clara; Density; Productivity; Variety.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100089

Солёностная и температурная толерантность морских копепод Acarita clausi и Acarita tonsa в эмбриональный период
Provedor de dados: 13
Autores: Губарева, Е. С.; Светличный, Л. С.
Speed of sinking to salinity and temperature gradients of the Marmara and Black Seas was calculated for eggs of Acartia clausi and A. tonsa laid in the upper layers basing on egg mass densities. The effect of gradual changing of temperature and salinity on egg hatching success of these species was studied.
Tipo: Book Section
Palavras-chave: Acartia clausi; Acartia tonsa; Eggs; Density; Hatching success; Marmara Sea; Black Sea.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1848

Abundance of Conepatus chinga (Carnivora, Mephitidae) and other medium-sized mammals in grasslands of southern Brazil
Provedor de dados: 76
Autores: Kasper,Carlos B.; Bastazini,Vinícius A. G.; Soares,José B. G.; Freitas,Thales R. O. de.
Between January 2007 and December 2010, the abundance of medium-sized mammals was studied, with special focus on the Molina's hog-nosed skunk, Conepatus chinga (Molina, 1782), at four locations in southern Brazil. In this study, transect line methodology was used to obtain data for Distance Analyses. Transects were traveled by car at night, searching with spotlights along the edges of secondary roads in agricultural landscapes. Along 1,811 km, we obtained 620 observations of 20 mammal species. The most common species was the exotic European hare, Lepus europaeus (Pallas, 1778); the highest abundance estimated for South America was observed in one of the study areas, where its density was estimated as 32 individuals/km². Carnivores were the most commonly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Pampa; Transect lines; Sympatric species.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212012000300009

Minimilho: efeito de densidades de plantio e cultivares na produção e em algumas características da planta de milho.
Provedor de dados: 14
Autores: PEREIRA FILHO, I. A.; GAMA, E. E. G. e; CRUZ, J. C.
bitstream/item/30783/1/Pesq.And.-23.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Minimilho; Densidade; Variedades; Sete Lagoas; Minas Gerais; Brasil; Babycorn; Production; Yield; Variation.; Plantio; Produção; Rendimento; Zea Mays.; Density; Brazil; Planting.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/478861

Variacao da densidade basica de madeira e produtividade de Eucalyptus spp.
Provedor de dados: 14
Autores: ALBINO, J. C.; TOMAZELLO FILHO, M.
Variacao da densidade basica de amdeira e produtividade de volume e massa foram estudadas em doze especies de eucalipto, em tres regioes bioclimaticas do Estado de Minas Gerais (Uberaba, Paraopeba e Vicosa). A densidade basica foi determinada pelo metodo de maximo teor de umidade; e a amostragem foi realizada pelo processo nao-destrutivo, com amostras, em forma de gaguetas, retirada atraves da sonda Presler. A avaliacao da densidade basica da madeira das especies de eucalipto foi realizada nos ensaios com7,5 anos de idade em todos os locais estudados. Foi detectado um efeito do local sobre a densidade basica e producao volumetrica de todas as especies. Em Vicosa, estas apresentaram maior crescimento em altura e diametro e menor densidade basica da madeira....
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Densidade.; Cerrado; Eucalipto; Madeira; Produtividade.; Eucalyptus; Density; Wood.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547557

Cultivares, épocas de semeadura, populações, densidades e espaçamentos de soja, recomendados para o Estado do Paraná - ano agrícola 1979/80.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54027/1/3.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Praticas culturais; Variedade recomendada; Densidade; Brasil; Parana; Soybean; Recommended varieties; Spacing; Cultural methods.; Espaçamento; Época de Semeadura; População; Soja.; Density; Brazil; Population; Sowing date.
Ano: 1979
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444334

Calibração da técnica de Time Domain Reflectometry (TRD) para avaliação da umidade do solo, em um Latossolo Amarelo, textura muito argilosa, com diferentes valores de densidade aparente do solo - avaliação no campo.
Provedor de dados: 14
Autores: TEIXEIRA, W. G.; FACCIN, O. P.; AZEVEDO, C. P. de; HUWE, B.; SCHROTH, G.
Avaliação de umidade volumetrica do solo pela técnica de time Domain Reflectometry (TDR) para Latossolo Amarelo (Xanthic ferralsol - FAO) textura muito argilosa, com diferentes valores de p. Foram determinados os coeficientes de determinacao ajustada (R2) e o erro padrao da media. Realizou-se um ajuste por regressao multipla para P e E, selecionando-se as variaveis que contribuiam significativamente para o modelo por procedimentos de selecao stepwise. Como a variacao dos valores de p esta diretamente relacionada ao uso do solo (especie presente e o manejo praticado), foram observadas importantes diferencas entre as P das areas cultivadas e as da floresta primaria. Os valores reduzidos de P proxima as plantas de pupunha (Bactris gasipaes H.B.K.) em relacao...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Propriedade fisica; Fluxo; Brasil; Amazonas; Tropical rain forest; Moisture; Fluxes; Água; Bactris Gasipaes; Cupuaçu; Floresta Tropical Úmida; Kudzu; Pueraria Phaseoloides; Pupunha; Solo; Theobroma Grandiflorum; Umidade; Uso da Terra; Density; Land use; Physical properties; Soil; Water.
Ano: 1997
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/667398

Propriedades físicas dos principais solos da Amazônia brasileira em condições naturais.
Provedor de dados: 14
Autores: BAENA, A. R. C.; DUTRA, S.
bitstream/item/31900/1/CPATU-BP33.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Propriedade física; Densidade; Brasil; Resistance; Physical proprieties; Yield.; Produtividade; Porosidade; Resistência; Solo.; Amazonia; Density; Porosity; Soil.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381146

Comparação dos métodos anel volumétrico e radiação gama na determinação da densidade aparente do solo.
Provedor de dados: 14
Autores: COSTA, E. F.; COUTO, L.
bitstream/item/45917/1/ct-1.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Sete Lagoas; Minas Gerais; Brasil; Savanna; Red dark latosol; Yellow red latosol.; Cerrado; Física do Solo; Latossolo Vermelho Escuro; Latossolo Vermelho Amarelo; Solo.; Density; Brazil; Soil physics.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/476270

Cultivares de soja 1999.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/CNPSO/16207/1/doc123.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Cultivar; Brasil; Soybean; Production.; Densidade de Semeadura; Época de Semeadura; Melhoramento; População; Produção; Soja.; Density; Brazil; Population; Plant breeding; Sowing date; Varieties.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/460383

Cultura do girassol: tecnologia de produção.
Provedor de dados: 14
Autores: CASTRO, C. de; CASTIGLIONI, V. B. R.; BALLA, A.
Escolha de area e preparo do solo; Correcao da acidez; Adubacao; Epoca de plantio; Plantio; Densidade; Controle de plantas daninhas; Doencas e pragas; Colheita.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Preparo do solo; Semeadura direta; Densidade; Planta daninha; Brasil; Parana; Sunflower; Production; Disease; Pest.; Acidez do Solo; Adubação; Colheita; Época de Semeadura; Doença; Girassol; Plantio Direto; Praga; Produção.; Fertilizer application; Harvesting; Brazil; Density; No-tillage; Soil pH; Sowing date; Tillage; Weeds.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/459921

Recomendações de cultivares de soja, épocas de semeadura, populações, densidades e espaçamentos de soja para o Estado do Paraná, para o ano agricola 1983/84.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54021/1/20.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Variedade recomendada; Brasil; Parana; Soybean; Cultural methods; Spacing; Recommended variety.; Espaçamento; Época de Semeadura; População; Pratica Cultural; Soja.; Density; Brazil; Population; Sowing date.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444340

Densidade básica da madeira de espécies de Pinus tropicais determinada através de métodos não-destrutivos.
Provedor de dados: 14
Autores: MOURA, V. P. G.; SANTIAGO, J.
bitstream/item/75929/1/bolpd-33.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Densidade; Woody; Pines; Região tropical; Teste de procedência.; Cerrado; Madeira; Método; Procedência; Pinheiro; Variação Genética.; Pinus; Genetic variation; Density; Provenance.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547940

Características da madeira de Liquidambar styraciflua.
Provedor de dados: 14
Autores: MATTOS, P. P. de; PEREIRA, J. C. D.; SCHAITZA, E. G.; CARVALHO, P. E. R.
bitstream/item/42004/1/CT0049.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Espécie exótica; Densidade básica; Poder calorífico; Fibres.; Liquidambar; Energia; Madeira; Liquidâmbar Styraciflua; Composição Química; Fibra.; Chemical composition; Density; Wood.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/307172

Manejo cultural de minimilho.
Provedor de dados: 14
Autores: PEREIRA FILHO, I. A.; CRUZ, J. C.
bitstream/CNPMS/13766/1/Circ_07.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Minimilho; Cultivo; Epoca; Densidade; Baby corn; Date; Spacing.; Espaçamento; Plantio.; Density; Planting.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/485217

Camadas de impedimento mecanico do solo em sistemas agricolas com a soja.
Provedor de dados: 14
Autores: TORRES, E.; SARAIVA, O. F.
Impedimento mecanico do solo e desenvolvimento do sistema radicular; Resistencia do solo a penetracao: raizes x penetrometros; Propriedades fisicas do solo e producao das culturas; Avaliacao e monitoramento da compactacao do solo; Manejo da compatacao do solo no plantio direto.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Compactacao; Densidade; Semeadura direta; Brasil; Parana; Soil chemicophysical properties; Soybean; Zero tillage; Sowing direct.; Física do Solo; Manejo do Solo; Soja; Solo.; Brazil; Density; Soil management.; Soil compaction.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/461800

Recomendações de cultivares, épocas de semeadura, populações, densidade e espaçamentos de soja para o Estado do Paraná no ano agrícola 1981/82.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54020/1/10.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Variedade recomendada; Brasil; Parana; Soybean; Cultural methods; Spacing; Recommended variety.; Época de Semeadura; Espaçamento; População; Pratica Cultural; Soja.; Density; Brazil; Population; Sowing date.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444341

Manejo e tratos culturais para o cultivo do milho verde.
Provedor de dados: 14
Autores: CRUZ, J. C.; PEREIRA FILHO, I. A.
bitstream/CNPMS/13777/1/Circ_16.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Epoca; Densidade; Green corn; Management; Date; Spacing.; Espaçamento; Manejo; Milho Verde; Plantio.; Density; Planting.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/485480

Competição de cultivares, níveis de adubação e densidade de milho, em três regiões do Estado de Minas Gerais.
Provedor de dados: 14
Autores: CORREA, L. A.; CRUZ, J. C.; SILVA, J.; OLIVEIRA, A. C. de; VIANA, A. C.; SILVA, A. F. da.
bitstream/item/36061/1/ct-4.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Fertilizacao; Praticas culturais; Densidade; Minas Gerais; Brasil; Maize; Cultural practices; Fertilization.; Milho; Variedade; Zea Mays.; Brazil; Density; Varieties.
Ano: 1983
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/476264

Crescimento vegetativo de limeira-ácida ?Tahiti? sobre novos porta-enxertos no norte de Mato Grosso.
Provedor de dados: 14
Autores: RONCATTO, G.; ROMANO, M. R.; CARAVINA, S. M.; OLIBONE, D.; GIRARDI, E. A.; SOARES FILHO, W. dos S.; BOTELHO, S. de C. C.; WRUCK, D. S. M.
Resumo: A cultura da limeira-ácida ?Tahiti? surge como uma alternativa para a agricultura familiar do norte de Mato Grosso. Para sua consolidação, é necessário que se estabeleça em bases modernas de produção, tendo o porta-enxerto como um de seus pilares. O objetivo do trabalho foi avaliar variáveis de crescimento vegetativo de limeira-ácida ?Tahiti CNPMF 02? enxertada em novos porta-enxertos nos municípios de Sorriso e de Guarantã do Norte. O delineamento experimental foi em blocos ao acaso com 14 tratamentos e quatro repetições de cinco plantas na parcela. As densidades de plantio foram de 513 e 582 pl ha-1, em Sorriso, MT e Guarantã do Norte, MT, respectivamente. Todas as combinações copa/porta-enxerto apresentaram compatibilidade e crescimento...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Citrus ×latifolia; Adensamento de plantio; Enxertia; Gomose-dos-citros; Foot-rot gummosis; Gummy stem bligh; Mato Grosso; Sorriso-MT; Guarantã do Norte-MT; Tahiti CNPMF 02; BRS Santana; BRS Donadio; BRS Matta; BRS Pompeu; BRS Cunha Sobrinho; BRS Bravo; BRS Ary S; BRS N Gimenes Fernandes; LCRSC; LCR-CNPMF 03; CTSW; CTRI; CTRSD; TSKTR; Fruta Cítrica; Poncirus Trifoliata; Limão Taiti; Gomose; Doença de Planta; Planta Porta-Enxerto; Citricultura; Citrus latifolia; Poncirus; Density; Grafting (plants); Gummosis; Rootstocks.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1137539

Recomendação de cultivares, épocas de semeadura, espaçamento e densidade da soja, para o ano agrícola 1985/86, no Paraná.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54025/1/33.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Variedade recomendada; Brasil; Parana; Soybean; Culural methods; Spacing; Recommended variety.; Época de Semeadura; Espaçamento; Pratica Cultural; Soja.; Density; Brazil; Sowing date.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444338

Variacao da densidade basica da madeira e produtividade de eucalyptus spp.
Provedor de dados: 14
Autores: ALBINO, J. O.; TOMAZELLO FILHO, M.
bitstream/item/83816/1/bolpd-26.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Densidade; Eucalyptus europhylla; Productivity; Woods.; Eucalyptus Saligna; Eucalipto; Eucalyptus Citriodora; Eucalyptus Cloeziana; Eucalyptus Grandis; Floresta; Madeira; Produção.; Eucalyptus pilularis; Eucalyptus; Density; Forest trees; Wood; Yields.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/561763

Efeitos de diferentes sistemas de cultivo nas propriedades físicas e produtividade do solo.
Provedor de dados: 14
Autores: BAENA, A. R. C.; DUTRA, S.; KITAMURA, P. C.
bitstream/item/40430/1/Boletim-Pesquisa-67-CPATU.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Propriedade física; Cultivo; Densidade; Capitão Poço; Pará; Brasil; Cultivation; Management; Physical proprierties; Yield.; Manejo; Latossolo Amarelo; Porosidade; Produtividade; Solo.; Amazonia; Density; Porosity; Soil.
Ano: 1985
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381693

Densidade aparente e porosidade do solo no desenvolvimento do milho.
Provedor de dados: 14
Autores: BAENA, A. R. C.; DUTRA, S.
bitstream/item/59280/1/CPATU-ComTec24.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Desenvolvimento; Densidade; Maize; Development; Growth.; Crescimento; Milho; Porosidade; Solo; Zea Mays.; Density; Porosity; Soil.
Ano: 1979
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376654

Recomendações técnicas para a cultura da soja no Paraná 1991/92.
Provedor de dados: 14
Autores: EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária.
A agricultura e Mercosul; Manejo do solo; Rotacao de culturas; Clima; Cultivares; Populacao e densidade de semeadura; Epocas de semeadura; Instalacao da lavoura; Controle de plantas daninhas; Manejo de pragas; Controle de doencas; Colheita; Retencao foliar ("haste verde"); Tecnologia de sementes.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Recomendacao tecnica; Cultivar; Densidade; Epoca; Planta daninha; Controle; Retencao foliar; Brasil; Parana; Soybean; Technical directions; Fertilization; Variety; Weed; Control; Pest; Disease; Fungus; Nematode; Harvest; Seed.; Adubação; Bactéria; Colheita; Doença; Fungo; Manejo; Nematóide; Pratica Cultural; População; Praga; Semeadura; Rotação de Cultura; Semente; Tecnologia; Solo; Vírus.; Soja; Density; Crop rotation; Crop management; Brazil; Population; Plant density; Soil; Sowing date.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/447056

Cultura do gergelim (sesamum indicum L.) no nordeste do Brasil.
Provedor de dados: 14
Autores: BELTRAO, N. E. de M.; FREIRE, E. C.
Informacos gerais; Sistema de cultivo.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Cultivo; Densidade; Controle; Brasil; Nordeste; Weed; Control; Pest; Harvest.; Colheita; Erva Daninha; Gergelim; Praga; Sesamum Indicum; Solo.; Density; Tillage; Soil.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/262744

Qualidade física do solo em sistemas de preparo convencional e plantio direto em latossolo do cerrado.
Provedor de dados: 14
Autores: SANTOS JÚNIOR, J. de D. G.; SÁ. M. A. C. de; REIN, T. A.
RESUMO: Menor desenvolvimento inicial em plantas de soja (safra 2004/2005) foi observado em plantio direto (PD em comparação ao plantio convencional (PC) em área experimental da Embrapa Cerrados. Diferenças visuais no sistema radicular sugeriram adensamento superficial no PD. Nesse local, avaliaram-se as alterações nos atributos físicos do solo relacionados aos sistemas de preparo e ao crescimento do milho cultivado, em sucessão à soja, na safra 2005/2006. O delineamento experimental foi em blocos completos ao acaso, com quatro repetições. Atributos físico-hídricos do solo, intervalo hídrico ótimo (IHO), parâmetro S e índice de cone determinado a campo (IC campo) foram avaliados como indicadores da qualidade física do solo. Os sistemas de preparo...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Plantio convencional; Densidade; Intervalo hídrico; Water availability; Soil chemicophysical properties; Zero tillage.; Disponibilidade de Água; Física do Solo; Plantio Direto; Solo.; Density; Conventional tillage; Soil.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570280

Recomendação de cultivares, épocas de semeadura, espaçamento e densidade da soja, para o ano agrícola 1984/85, no Parana.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54023/1/30.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Variedade recomendada; Brasil; Parana; Soybean; Cultural methods; Spacing; Recommended variety.; Época de Semeadura; Espaçamento; Pratica Cultural; Soja.; Density; Brazil; Sowing date.
Ano: 1984
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444339

Recomendações de cultivares, épocas de semeadura, populações, densidades e espaçamentos de soja para o Estado do Paraná no ano agrícola 1982/83.
Provedor de dados: 14
Autores: EMBRAPA. Centro Nacional de Pesquisa de Soja (Londrina, PR).
bitstream/item/54019/1/18.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Densidade; Espoca de semeadura; Variedade recomendada; Brasil; Parana; Soybean; Cultural methods; Spacing; Recommended variety.; Espaçamento; Pratica Cultural; População; Soja.; Density; Brazil; Population; Sowing date.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/444342

Cultura do girassol: tecnologia de produção.
Provedor de dados: 14
Autores: CASTRO, C. de; CASTIGLIONI, V. B. R.; BALLA, A.
Escolha da area e preparo do solo; Correcao da acidez; Adubacao; Epoca de plantio; Plantio; Densidade; Controle de plantas daninhas; Doencas e pragas; Colheita.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Preparo; Semeadura direta; Epoca; Densidade; Planta daninha; Brasil; Sunflower; Production; Fertilization; Weed; Disease; Pest; Harvest.; Acidez; Adubação; Colheita; Doença; Girassol; Pesquisa; Praga; Semeadura; Produção; Solo.; Acidity; Density; Brazil; No-tillage; Research; Sowing date.; Soil.
Ano: 1993
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445278

Structure of the upper water column in the northwest North Atlantic: Modern versus last glacial maximum conditions
Provedor de dados: 5
Autores: De Vernal, A; Hillaire-marcel, C; Peltier, Wr; Weaver, Aj.
During the Last Glacial Maximum, the northwestern North Atlantic constituted a major conduit for Labrador and Greenland ice sheet meltwaters. Vertical density gradients in its upper water masses have been reconstructed by combining information from transfer functions based on dinocysts and from oxygen isotope measurements (delta(18)O) in planktonic foraminifera. Transfer functions yield temperature and salinity and thus potential density (sigma(theta)) for the warmest (August) and coldest (February) months in the photic zone. The delta(18)O values in different size fractions of epipelagic (Globigerina bulloides) and mesopelagic (Neogloboquadrina pachyderma left-coiled (Np1)) foraminifera allow us to assess sigma(theta) gradients through the pycnocline...
Tipo: Text
Palavras-chave: Last Glacial Maximum; LGM; North Atlantic; Salinity; Density; Pycnocline.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00223/33405/31861.pdf

Analyse des pratiques, contraintes et performances d'élevage de l'huître creuse Crassostrea gigas, en 2001, sur différentes concessions en eau profonde de la Baie de Quiberon : enquête auprès de 18 concessionnaires et plongées sur 18 semis d'huîtres de 2 ans, en juin et octobre 2001
Provedor de dados: 5
Autores: Mazurie, Joseph; Foucart, Marie; Langlade, Aime; Bouget, Jean-francois; Fleury, Pierre-gildas; Joly, Jean-pierre; Martin, Anne-genevieve.
This study deals with rearing methods, growth and mortality performances, and problems encountered by the oyster farmers from Quiberon Bay (2800 ha of leases) : it relies on a survey achieved in july 2001, about 18 oyster farmers, and 2 diving campaigns (july and october 2001) on 2 years old oyster batches from the same farmers.  The analysed enterprises vary in particular by the location and depth of their concession inside the bay, but also by their rearing scheme : a majority favours seedings with 18 month old oysters or more, according to prices and availability of oysters supplies. The duration until marketable size and mean mortalities seem to have increased since a preceding inquiry in 1986.  The main constraint, affecting priorly the south border...
Tipo: Text
Palavras-chave: Rearing practices; Density; Predators; Mortality; Growth; Bay of Quiberon; Crassostrea gigas; Cupped oyster; Pratiques culturales; Densité; Algues; Prédateurs; Mortalité; Croissance; Baie de Quiberon; Crassostrea gigas; Huître creuse.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/rapport-6103.pdf

Behaviour and habitat utilisation of seven demersal fish species on the Bay of Biscay continental slope, NE Atlantic
Provedor de dados: 5
Autores: Uiblein, F; Lorance, Pascal; Latrouite, Daniel.
Much is known in very broad terms about the distribution of deep-sea fishes, but information on fine-scale habitat selection and behaviour in the largest living space on earth is still rare. Based on video sequences from 4 dives performed with the manned submersible 'Nautile' at depths between 400 and 2000 in in the Bay of Biscay, NE Atlantic, we studied the behaviour of co-occurring slope-dwelling deep-sea fishes. Five different habitats were identified according to depth range or topographical and hydrological characteristics. For each fish species or genus that could be identified, estimates of absolute abundance were provided. The most frequently occurring species, round-nose grenadier Coryphaenoides rupestris, blackmouth catshark Galeus melastomus,...
Tipo: Text
Palavras-chave: Submersible observations; Assemblage structure; Density; Locomotion; Vertical positioning; Foraging; Species specific; Behavioural flexibility.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00000/10666/7591.pdf

Prospection en plongée du gisement d'oursins du Golfe du Morbihan (2008)
Provedor de dados: 5
Autores: Dimeet, Joel.
Une évaluation du gisement d'oursins du golfe du Morbihan a été réalisée en 2008.Six stations ont été échantillonnées : Stibiden, Roc'h Vihan, Port Blanc, Kerners, Hent tenn et Brannec, une station de plus que les années précédentes Pour les cinq stations communes à 2007 et 2008 l'augmentation de la population d'oursins est de 5 % en global et de 25% pour les individus commerciaux. Les densités totales varient entre 87 et 136 individus pour 100 m2 et les densités commerciales entre 56 et 87 oursins pour 100m2. La densité maximale d'oursins commerciaux a été observée à Port blanc. Les tailles des oursins s'échelonnent entre 22mm et 88mm. 63% des oursins échantillonnés avaient une taille supérieure à la taille de première commercialisation, soit 55mm.
Tipo: Text
Palavras-chave: Density; Size; Sampling; Survey; Gulf of Morbihan; Layer; Urchin; Densité; Taille; Évaluation; Échantillonnage; Golfe du Morbihan; Gisement; Oursin.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/rapport-6775.pdf

The effect of density on sea bass (Dicentrarchus labrax) performance in a tank-based recirculating system
Provedor de dados: 5
Autores: Sammouth, Sophie; Roque D'Orbcastel, Emmanuelle; Gasset, Eric; Lemarie, Gilles; Breuil, Gilles; Marino, Giovanna; Coeurdacier, Jean-luc; Fivelstad, Sveinung; Blancheton, Jean-paul.
Sea bass (Dicentrarchus tabrax) (135 +/- 4 g) were reared under tank-based recirculating aquaculture system for a 63-day period at four densities: 10, 40, 70, 100 kg m(-3). Fish performance, stress indicators (plasma cortisol, proteonemia plus other blood parameters-Na+, K+, glucose, pH, total CO2- and water quality were monitored. At the end of the 63-day period, resistance to infection was also studied by a nodavirus challenge. A 25-day test was performed on fish from two extreme densities (10 and 100 kg m(3)) and one intermediate density (40 kg m(3)). With regards to the different density treatments, there was no significant difference between the daily feed intake (DFI) and the specific growth rate (SGR) up to a density of 70 kg m(-3). No significant...
Tipo: Text
Palavras-chave: Welfare; Performance; European sea bass; Recirculating system; Density.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6761.pdf

Deep-sea nematode assemblage has not recovered 26 years after experimental mining of polymetallic nodules (Clarion-Clipperton Fracture Zone, Tropical Eastern Pacific)
Provedor de dados: 5
Autores: Miljutin, Dmitry M.; Miljutina, Maria A.; Arbizu, Pedro Martinez; Galeron, Joelle.
We investigated nematode assemblages inhabiting the 26-year-old track created by experimental deep-sea mining of polymetallic nodules, and two adjacent, undisturbed sites, one with nodules and one without nodules. The aim was to compare density, assemblage structure, and diversity indices in order to assess the process of recovery of the nematode assemblage inhabiting the disturbed site. This experimental dredging was conducted in 1978 by the Ocean Minerals Company (USA) in the area of a French mining claim in the Clarion-Clipperton Fracture Zone (Tropical Eastern Pacific) at a depth of about 5000 m. The nematode assemblage had not returned its initial state 26 years after the experimental dredging: the total nematode density and biomass within the...
Tipo: Text
Palavras-chave: Body volume; Deep-sea; Density; Disturbance; Diversity; Dredging; Mining; Nematode; Nodule; Recolonization; Recovery.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00047/15867/13321.pdf

Variation in structure and biomass of the benthic communities at three contrasting sites in the tropical Northeast Atlantic
Provedor de dados: 5
Autores: Galeron, Joelle; Sibuet, Myriam; Mahaut, Ml; Dinet, A.
Three major size classes of the benthic metazoan communities (megafauna, macrofauna and meiofauna) were investigated simultaneously at 3 sites in the tropical Northeast Atlantic. The sites varied in their level of surface primary productivity (eutrophic, mesotrophic and oligotrophic). Results for 3 cruises in 3 seasons (Eumeli 2, winter 1991; Eumeli 3, autumn 1991; Eumeli 4, spring 1992) are given for each size class in terms of taxonomic composition, density and biomass. The benthic communities did not exhibit evidence of seasonal variation, but there were substantial differences in the quantitative structure of the metazoan communities between the 3 sites. Total metazoan density and biomass, as well as density and biomass of each size class, decreased...
Tipo: Text
Palavras-chave: Deep sea; Tropical Atlantic; Meiofauna; Macrofauna; Megafauna; Taxonomic composition; Density; Biomass; Environmental conditions.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00000/10519/7602.pdf

Some methods for quantifying quality in the scallop Pecten maximus (L.)
Provedor de dados: 5
Autores: Maguire, Julie A.; Fleury, Pierre-gildas; Burnell, Gavin M.
(Not controled OCR) Because biological systems do not work in isolation, behavioral, biochemical, and physiological tests can give an overview of an individual's vital processes and reaction to stress. Two stress gradients were applied in this study, a short acute desiccation stress and a long-term density stress. These stress gradients were used to assess the usefulness of various techniques for quality assessment: namely, a standard salinity stress test, condition index, recessing speed of the scallop, adenylic energetic charge (AEC). and percentage carbohydrate content of the striated muscle. The results showed that AEC could be used effectively to measure the effect of a short-term stress. In the striated muscle. AEC levels were useful in...
Tipo: Text
Palavras-chave: Density; Desiccation; Quality; Stress; Pecten maximus.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-2450.pdf

Eastern Tropical Atlantic Mixed Layer Depth: Assessment of Methods from In Situ Profiles in the Gulf of Guinea from Coastal to High Sea
Provedor de dados: 5
Autores: N’guessan, Benjamin Kouadio; Kouassi, Aka Marcel; Trokourey, Albert; Toualy, Elisée; Kanga, Desiré Kouamé; Brehmer, Patrice.
To assess the eastern Atlantic tropical mixed layer depth (MLD) at 4°W in the Gulf of Guinea, water temperature and density profiles from over five hundred historical observational Conductivity – Temperature - Depth (CTD) data were used. These data, obtained from key oceanographic survey databases covering 60 years (1956 to 2016) were used for a numerical and visual determination of the MLD. The numerical approach consists of the use of the algorithms of three methods; while the visual estimation of the MLD were made on both temperature and density profiles. The numerical approaches were evaluated by comparing their results on the determination of tropical MLD with those of the visual inspections by means of statistical and graphical analysis in order to...
Tipo: Text
Palavras-chave: Mixed layer depth; Gulf of Guinea; Atlantic Ocean; Density; Temperature.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71115/75615.pdf

Endurcissement du naissain d’huîtres creuses, Crassostrea gigas par le niveau d’exondation ou la densité d’élevage : récapitulatif d’essais conduits entre 2004 et 2007 en rivière d’Auray (56), pour réduire les mortalités estivales
Provedor de dados: 5
Autores: Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Claude, Serge.
This report summarizes a list of husbandry experiments conducted between 2004 and 2007 so as to reduce the summer mortalities of the oyster Crassostrea gigas by farming practices. The Japanese technique so‐called “hardening”, based on nursing the young oysters (less than 1 year‐old) in intertidal areas with high air exposure, is tested and adapted. Significant improvements of survival rates (e.g. 60% survival instead of 40% survival rate) have been obtained by transferring the spat only a few month (between march and june‐july) on “high” inter‐tidal farming plots (up to 40% of mean air exposure time). In such conditions, growth is transiently reduced, but a compensatory growth seems to happen when oysters are transferred back on low concessions. Another...
Tipo: Text
Palavras-chave: Huître; Crassostrea gigas; Mortalité; Endurcissement; Exondation; Densité; Oyster; Crassostrea gigas; Mortality; Hardening; Air exposure; Density.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00042/15350/12705.pdf

Particules en suspension dans la Baie de Seine: Concentration et sedimentation instantanee en periode d''etiage
Provedor de dados: 5
Autores: Brun, C; Benbrahim, M.
Granulometry, density estimation, massic charge, sedimentary flux of suspensions and time of suspended forms are the different parts of this report. The studies have taken place during low-water levels and don't take into consideration the effects of storms and floods.
Tipo: Text
Palavras-chave: Density; Granulometry; Low tide; Sedimentation; Particle concentration; Suspended particulate matter.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1279.pdf

Prospection en plongée du gisement d'oursins du Golfe du Morbihan (2007)
Provedor de dados: 5
Autores: Dimeet, Joel.
Une évaluation du gisement d'oursins du golfe du Morbihan a été faite en 2007. Le même protocole que les années précédentes a été utilisé. On constate cependant, qu'en règle générale, en 2007 par rapport à 2006 les quantités prélevées sont plus importantes sur toutes les stations sauf pour la station de Port Banc. Le fait que le plongeur qui a échantillonné cette zone soit non expérimenté pourrait expliquer cette différence...
Tipo: Text
Palavras-chave: Density; Size; Sampling; Survey; Gulf of Morbihan; Layer; Urchin; Densité; Taille; Évaluation; Échantillonnage; Golfe du Morbihan; Gisement; Oursins.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-6774.pdf

Point, alpha and beta diversity of carnivorous fish along a depth gradient
Provedor de dados: 5
Autores: Lorance, Pascal; Souissi, Sami; Uiblein, Franz.
The catch from bottom longline stations sampled from a series of research cruises around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was analysed in terms of fish distribution, density and diversity. The distribution of the number of species and individuals caught per station appeared to fit well the Poisson and Exponential distribution function, respectively. In particular, the parameter of the Poisson's distribution appeared to provide an index of the point (at station scale) diversity, and its confidence interval, allowing for statistical comparisons. The relationships between point diversity, the alpha diversity (in the depth strata) and the beta diversity (along the depth gradient) were investigated. Around the islands, the density and...
Tipo: Text
Palavras-chave: Canary Islands; Probability distributions; Density; Diversity; Demersal fishes; Longline.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-566.pdf

Effects of stocking density on intermediate culture of the razor clam Ensis arcuatus (Pharidae: Bivalvia)
Provedor de dados: 5
Autores: Da Costa Gonzalez, Fiz; Barreiro, Berta; Ojea, Justa; Novoa, Susana; Martinez-patino, Dorotea.
Commercial production of most bivalve species involves a phase of intermediate cultivation during which juveniles are grown under protected conditions until they can be transferred to the final grow-out location. Consequently, the aim of this study was investigating the effect of density on growth and survival in the intermediate culture of the razor clam Ensis arcuatus in raft. Two series of experiments were performed, using in the first experiment two holding systems: 5-L plastic bottles and PVC cylinders, both perforated, covered with a 1 mm mesh net to prevent razor clam escape and a 10-cm layer of coarse grained sand (300–1200 lm grain diameter). In this trial, two stocking densities were tested: 0.15 and 0.30 kg m-2. In the second one-two densities...
Tipo: Text
Palavras-chave: Ensis arcuatus; Intermediate culture; Density; Raft.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00166/27731/25980.pdf

Influence de la densite et de l'age des huitres japonaises (Crassostrea gigas ) sur la croissance et la composition biochimique en bassins de terre
Provedor de dados: 5
Autores: Bodoy, A; Geiaron, P; Garnier, Jacqueline; Heurtebise, S.
Two different biomasses (100 g multiplied by m super(-2) and 1 kg multiplied by m super(-2)) of oysters were put in identical sea-water ponds, thus leading to different trophic conditions, corresponding to rearing techniques. Changes in growth, biochemical composition and sexual maturation were recorded for two age groups. The first one included 9 month-old oysters and the second one 21 month-old oysters, at the beginning of the experiment. For both age groups, significant differences were observed in growth and biochemical composition. Lipids were accumulated faster for the lower biomass. However, the only difference concerning glycogen was observed on the older oysters. They showed a peak at the lowest biomass and a decrease at the larger biomass. Sexual...
Tipo: Text
Palavras-chave: Crassostrea gigas; Bivalvia; Sea water; Oyster culture; Glycogen; Age; Chemical composition; Lipids; Biochemistry; Sexual maturity; Rearing; Pond culture; Biomass; Growth; Density.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-916.pdf

Tropical Atlantic Mixed Layer Buoyancy Seasonality: Atmospheric and Oceanic Physical Processes Contributions
Provedor de dados: 5
Autores: Camara, Ibrahima; Mignot, Juliette; Kolodziejczyk, Nicolas; Losada, Teresa; Lazar, Alban.
This study investigates the physical processes controlling the mixed layer buoyancy using a regional configuration of an ocean general circulation model. Processes are quantified by using a linearized equation of state, a mixed-layer heat, and a salt budget. Model results correctly reproduce the observed seasonal near-surface density tendencies. The results indicate that the heat flux is located poleward of 10° of latitude, which is at least three times greater than the freshwater flux that mainly controls mixed layer buoyancy. During boreal spring-summer of each hemisphere, the freshwater flux partly compensates the heat flux in terms of buoyancy loss while, during the fall-winter, they act together. Under the seasonal march of the Inter-tropical...
Tipo: Text
Palavras-chave: Physical processes; Salt and heat budget; Density; Compensation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00634/74636/74530.pdf

Advances in measuring ocean salinity with an optical sensor
Provedor de dados: 5
Autores: Le Menn, Marc; De La Tocnaye, J. L. De Bougrenet; Grosso, P.; Delauney, Laurent; Podeur, Christian; Brault, P.; Guillerme, O.
Absolute salinity measurement of seawater has become a key issue in thermodynamic models of the oceans. One of the most direct ways is to measure the seawater refractive index which is related to density and can therefore be related to the absolute salinity. Recent advances in high resolution position sensitive devices enable us to take advantage of small beam deviation measurements using refractometers. This paper assesses the advantages of such technology with respect to the current state-of-the-art technology. In particular, we present the resolution dependence on refractive index variations and derive the limits of such a solution for designing seawater sensors well suited for coastal and deep-sea applications. Particular attention has been paid to...
Tipo: Text
Palavras-chave: Refractive index; Seawater; Density; Salinity; Refractometer.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00052/16295/13899.pdf

Evaluation of trawling disturbance on macrobenthic invertebrate communities in the Bay of Biscay, France: Abundance biomass comparison (ABC method)
Provedor de dados: 5
Autores: Vergnon, Rémi; Blanchard, Fabian.
The necessity to move from a traditional fishery management to an ecosystem approach is now acknowledged. Indicators are required to support the development of this approach. For example, community indicators have been proposed to assess the impact of fishing. We tested here the applicability of one such community indicator, the abundance-biomass comparison (ABC method), as a measure of the impact of bottom trawling (years of sampling: 2001 and 2003) on the benthic invertebrates-typically starfishes, crabs, squat lobsters, shrimps and large hard-shelled molluscs-of "Grande Vasiere", a major French fishing zone, in the Bay of Biscay. The ABC method is generally used as an impact indicator for different types of physical, biological and anthropogenic...
Tipo: Text
Palavras-chave: Atlantic Ocean; Inter annual variability; Density; Macrobenthos; ABC method; Fishing impact; Indicator; Bottom trawl survey.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2133.pdf

Comportement Mécanique de Composites Renforcés de Lamelles de Bambou, Influence du Vieillissement dans l’Eau de Mer
Provedor de dados: 5
Autores: Davies, Peter; Arhant, Mael; Le Gac, Pierre Yves; Le Gall, Maelenn; Kemlin, Guillaume.
There are more than a thousand species of bamboo and some of these contain large amounts of fibres with attractive properties. However, the extraction of the fibres without damaging them is difficult, requiring energy and special equipment. One solution is to use the bamboo in the form of thin strips taken from fibre-rich regions of the plant, as done by the Cobratex company in an innovative process. These contain the fibres but they are protected from damage and keep their alignment. This paper presents the results from a study of bamboo strips, alone and in an infused composite. The influence of seawater immersion is investigated. The composite weight gain is high, around 25 %, but most of the water is in the natural canals of the wood. The influence of...
Tipo: Text
Palavras-chave: Bamboo; Density; Mechanical properties; Wet aging.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00593/70534/68681.pdf

Prospection en plongée du gisement d'oursins du Golfe du Morbihan (2003 – 2006)
Provedor de dados: 5
Autores: Dimeet, Joel.
Une évaluation du gisement d'oursins du golfe du Morbihan a été effectuée tous les ans pendant la période 2003 - 2006 avec le même protocole.  Trois plongeurs sur quatre ont participé à toutes les plongées. Ceci nous permet de comparer les résultats d'une année sur l'autre même si les positionnements sur chaque zone ne sont pas parfaitement les mêmes et que les conditions météo (visibilité et courant) sont rarement similaires. Depuis 2003 on peut remarquer une progression constante des captures totales sur l'ensemble des stations, aussi bien pour les non commerciaux (&lt;55 mm) que pour les commerciaux. En 2003, la récolte représentait 19 % de la totalité des oursins (avec autant de commerciaux que de non commerciaux) tandis qu'elle représentait près de 31...
Tipo: Text
Palavras-chave: Brannec; Kerners; Hen tenn; Roc'h vihan; Port Blanc; Stibiden; Density; Size; Sampling; Survey; Gulf of Morbihan; Layer; Urchin; Brannec; Kerners; Hent tenn; Roc'h vihan; Port Blanc; Stibiden; Densité; Taille; Échantillonnage; Plongée; Golfe du Morbihan; Gisement; Oursin.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-6773.pdf

Recommended flax fibre density values for composite property predictions
Provedor de dados: 5
Autores: Le Gall, Maelenn; Davies, Peter; Martin, Nicolas; Baley, Christophe.
Density is one of the fundamental properties of fibres which reinforce polymer matrix composites, and is used both to estimate composite weight and to evaluate fibre content for property predictions. For traditional composites, reinforced by glass or carbon fibres, unique density values are well known for a particular fibre grade and provide reliable fibre content estimations and composite property predictions. However, this is not the case for natural fibres. This paper first reviews published density values for flax (Linum usitatissimum L.) fibres and describes the limitations of techniques used to measure fibre density. Significant variations in published densities are found, which can be related to the measurement method. New data quantify the...
Tipo: Text
Palavras-chave: Density; Flax; Archimedes; Pycnometer; Volume fraction; Tensile modulus.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00427/53875/55082.pdf

Développement et essais d’un salinomètre optique pour l’océanographie
Provedor de dados: 5
Autores: Le Menn, Monique; Malardé, Damien; David, Arnaud; Brault, Patrice; Grosso, Philippe; De Bougrenet De La Tocnaye, Jean-louis; Le Reste, Serge; Podeur, Christian.
Salinity is the essential parameter for ocean dynamics studies. Its definition and using in the equations used to calculate the thermodynamic properties of seawater, were revised in 2010, opening the possibility of new sensors developments. In this context, NOSS (NKE Optical Salinity Sensor) has emerged as one of the first underwater instrument for in situ refractive index measurement in the past years open up the scope of possibilities to access to density parameter. This achievement is the fruit of the cooperation between several institutions and the fruit of several years of developments and trials. NOSS sensor is designed to be deployed in coastal environment and open-ocean waters up to 2000m, especially on profiling floats of the Argo network.
Tipo: Text
Palavras-chave: Salinity; Density; Ocean; Seawater; Refractive index; Sensor.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00664/77601/79616.pdf

Establishment and population features of the non-native Atlantic rangia, Rangia cuneata (Mollusca: Bivalvia), in northwestern France
Provedor de dados: 5
Autores: Faillettaz, Robin; Roger, Christophe; Mathieu, Michel; Robin, Jean-paul; Costil, Katherine.
The presence of shells of the Atlantic rangia, Rangia cuneata, a brackish-water species native from the Gulf of Mexico also known as gulf wedge clam, was reported in 2017 on the French coasts of the English Channel, in the waterway that connects Caen to the sea. However, no information was available on whether a population of this alien species had successfully established in the region. Here, only empty shells—except for one live individual—were sampled in that waterway, and the sampling was shifted to the nearby marina of Ouistreham, where water is mesohaline (6.89 ± SD 0.06 PSU). In spring 2017, the mean density in the marina reached 110.45 ± 86.08 ind m-2, largely dominating the benthos community. The population was mostly composed of fairly large...
Tipo: Text
Palavras-chave: The Atlantic rangia; Alien species; Normandy (F); Brackish waters; Density; Growth; Reproduction.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00634/74623/74515.pdf

Effect of the density of the culture and the depth on the seasonal variation of the biochemical composition of Crassostrea virginica in patuxent river (Chesapeake Bay)
Provedor de dados: 5
Autores: Prou, Jean; Heral, Maurice; Goulletquer, Philippe; Forget, Maïté; Bougrier, Serge; Razet, Daniel.
The project of cultivation of oyster has been designed to evaluate the growth rate, the mortality, the reproductive effort, production and biochemical composition of the oyster function of the density and the depth. This plan was intended: - to build model of growth rate, - to demonstrate the action of the different parameters on growth rate (temperature, food effect...), - to evaluate the density effect to see if the available food could be a limiting factor, - to estimate the effect of the depth joined to the impact of the high turbidity near the bot tom, - to detect the mortality related to the prevalence of diseases.   The project began in July 1989 by dredging 20 000 small oysters at the mouth of the Patuxent River near Cove Point. Three experimental...
Tipo: Text
Palavras-chave: Physiology; Seasonal variation; Biochemical composition; Density; Crassostrea virginica; Cheseapeake Bay.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00200/31104/29503.pdf

The Bolivian river dolphin in the Tijamuchi and Ibare rivers (Upper Madeira Basin) during the rainy season in "La Niña" event
Provedor de dados: 81
Autores: Aliaga-Rossel,Enzo; Quevedo A.,Sandra.
This study determined the density of Bolivian bufeo (river dolphin) in two rivers with similar habitat characteristics during "La Niña" event of 2008. The density varied between 1 ind./km² in Tijamuchi river and 0.2 ind./km² in Ibare river. Previous studies showed higher densities in both rivers. We suggest that this reduction could be related to greater levels of human activity and the abnormal floods during "La Niña" affecting water quality due to the incorporation of garbage, latrines contents and sewage into the river.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bolivia; Inia boliviensis; Inia geoffrensis boliviensis; Water quality; Density.
Ano: 2011
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832011000200011

Culture en conditions optimisées de la macroalgue rouge &lt;Gracilaria gracilis&gt; (stackhouse) steentofr et al. dans le lac de Bizerte
Provedor de dados: 20
Autores: Ksouri, J.; Challougui, I.; Mensi, F.
La culture de Gracilaria  a été réalisée selon le mode de bouturage dans la partie Nord-Est du lac de Bizerte du 15 Avril au 31 Mai 2006 afin de déterminer l'effet des conditions initiales optimisées sur le rendement final.  Ces conditions initiales,  sont caractérisées par une culture sur le fond (sur cordes tendues), un poids initial des touffes de 200 g, une distance entre les rangées de culture de 50 cm et un écartement entre les touffes de 30 cm; de ce fait, la densité initiale est de 1,4 kg/m². Au terme de 46 jours de culture, nous avons enregistré un accroissement du poids de 200 g à 1280 g engendrant un taux de croissance spécifique de 4,03 %/j et une densité finale de 9,1kg/m² (soit 91t poids frais/ha).
Tipo: Journal Contribution
Palavras-chave: Algal culture; Aquaculture systems; Aquaculture techniques; Density; Growth rate; Off-bottom culture; Seaweed culture; Aquaculture techniques; Seaweed culture; Algal culture; Density; Growth rate; Http://aims.fao.org/aos/agrovoc/c_28992; Http://aims.fao.org/aos/agrovoc/c_6914; Http://aims.fao.org/aos/agrovoc/c_31892; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2008
URL: http://hdl.handle.net/1834/3795

Malacofauna terrestre asociada a los cayos de la región central del golfo  de Ana María, Cuba
Provedor de dados: 20
Autores: Hernández Alvarez, D.
El presente estudio se realizó en octubre del 2011 y marzo del 2012 en la región central del golfo de Ana María. Se determinó  la composición y densidad de las comunidades de moluscos terrestres mediante el método de conteo directo en parcelas  cuadradas. Para cada individuo, se anotó la especie vegetal, estrato vertical y microhábitat usado. Se encontraron las especies  Cerion sanctacruzense, Cerion sp., Cerion sp.1 y Hemitrochus maculifera, distribuidas en cinco de los cayos visitados. Las dos  primeras especies se observaron en dos cayos y las restantes en una localidad solamente. Los mayores valores de densidad se  reportaron en octubre del 2011 para C. sanctacruzense (1,77 ind/m²) y Cerion sp. (1,70 ind/m²) en los cayos Santa María de  Afuera y...
Tipo: Journal Contribution
Palavras-chave: Density.
Ano: 2012
URL: http://hdl.handle.net/1834/4636

Distribución y abundancia de las Ascidias de los fondos rocosos de la Bahía de Cuajiniquil, Costa Rica
Provedor de dados: 20
Autores: Nova-Bustos, Nidya; Hernández-Zanuy, Aida-C.; Viquez-Portuguez, Rigoberto.
Las ascidias de la costa del Pacífico centroamericano están muy poco estudiadas a pesar de que este grupo se destaca entre los miembros de la fauna bentónica de los fondos duros de la región. Teniendo en cuenta lo anterior, el objetivo del presente trabajo es conocer la distribución y abundancia de las ascidias en los fondos rocosos de la bahía de Cuajiniquil. Se ofrecen datos de la densidad (individuos por metro cuadrado de fondo) de las ascidias solitarias Rhopalaea birkelandi (Tokioka) y Ascidia ceratodes (Huntsman) a 5, 10 y 15 m de profundidad en tres transectos perpendiculares a la costa que se ubicaron en Isla David, Bajo Rojo y Bajo Viejón, sitios costeros de la bahía de Cuajiniquil, en el noroeste de Costa Rica. Otras tres especies de ascidias...
Tipo: Journal Contribution
Palavras-chave: Distribution; Abundance; Density; Marine invertebrates; Distribution; Density; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 2010
URL: http://hdl.handle.net/1834/3735

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Romdhane, M.S.; Chebil Ajjabi, L.; El Abed, O.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel fisheries; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater treatment; Water quality; Mytilus galloprovincialis; Wastewater treatment; Mussels; Nutrients; Http://aims.fao.org/aos/agrovoc/c_31155; Http://aims.fao.org/aos/agrovoc/c_25312; Http://aims.fao.org/aos/agrovoc/c_5010; Http://aims.fao.org/aos/agrovoc/c_5274.
Ano: 2008
URL: http://hdl.handle.net/1834/4154

Comparación experimental de las cepas colombianas de Artemia (Galerazamba, Manaure y Pozos Colorados)
Provedor de dados: 20
Autores: Newmark-Umbreit, F.
Se examinaron en el laboratorio las influencias de la densidad de siembra y la salinidad en la producción de biomasa, el crecimiento y la madurez sexual de cepas Colombianas de Anemia.  Los resultados indican (P&lt;0.05) que cuando se combinan densidades de siembra bajas (10 na up I ios/1 ¡tro) y salinidades de 130°/oo, se incrementa el crecimiento, la madurez sexual, y la producción de biomasa de las tres cepas estudiadas. La cepa de Galerazamba se apartó un poco de dicho comportamiento al presentar producciones importantes de biomasa y de hembras maduras sexualmentea salinidades de 130°/ooy densidades de 50 nauplios/litro. Finalmente, con base en las diferencias biométricas y el comportamiento del cultivo experimental, se concluye que la cepa de...
Tipo: Journal Contribution
Palavras-chave: Interspecific relationships; Marine crustaceans; Carcinology; Bioassays; Salinity effects; Biomass; Density; Bioassays; Biomass; Density; Http://aims.fao.org/aos/agrovoc/c_15731; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 1990
URL: http://hdl.handle.net/1834/3888

Aspectos biológicos y ecológicos de Mytilopsis sallei (Recluz, 1849) (Bivalvia: Dreissenidae) en bancos de ostra de la Ciénaga Grande de Santa Marta, Caribe colombiano
Provedor de dados: 20
Autores: Puyana, Mónica.
Mytilopsis sallei es una especie que se encuentra ampliamente distribuida sobre sustratos duros en la Ciénaga Grande de Santa Marta, siendo particularmente abundante sobre bancos de ostra de mangle (Crassostrea rhizophorae), donde alcanza densidades de hasta 5000 indiv/m2. Aunque posee una amplia tolerancia a variaciones en la salinidad y temperatura, prefiere aquellos lugares donde la afluencia de aguas dulces es constante. Puede además tolerar aguas turbias con un alto contenido de sedimentos, como en la desembocadura de los ríos. M. sallei no parece aparentemente, competir con la ostra, incluso en aquellos bancos sometidos a intensa explotación. Esto se debe a las preferencias ambientales de cada especie y a la alta productividad de las aguas de la...
Tipo: Journal Contribution
Palavras-chave: Ecology; Population structure; Salinity effects; Temperature effects; Density; Condition factor; Turbidity; Interspecific relationships; Population dynamics; Coastal lagoons; Estuaries; Ecology; Population structure; Turbidity; Estuaries; Density; Population dynamics; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1995
URL: http://hdl.handle.net/1834/3802

Abundancia y madurez sexual de Anadara Similis en el manglar de Luisico, Bahía Malaga, Pacífico colombiano
Provedor de dados: 20
Autores: Manjarrés Villamil, Alex E.; Lucero Rincón, Carlos H.; Walteros, William O.; Kantera Kintz, Jaime R.; Gil Agudelo, Diego L.
La abundancia y madurez sexual de la piangua Anadara similis fue analizada mensualmente entre septiembre de 2009 y agosto de 2010 en el archipiélago de La Plata, Bahía Málaga, Pacífico colombiano. La madurez sexual se analizó a nivel macroscópico mediante la observación del tejido reproductivo en fresco y microscópico por medio de métodos histológicos estándares. Se estimó una densidad media de 0.130 ± 0.098 ind/m2 y una talla media de 42.30 ± 5.00 mm. Los meses de mayor densidad fueron mayo (0.295 ind/m2) y agosto (0.195 ind/m2). La talla media de madurez sexual fue de 41.8 ± 4.5 mm y talla media de 41 mm donde 50% de la población ha tenido mínimo un desove (L50%). Se registraron picos máximos reproductivos durante marzo (83.3%) y abril (75.0%), aunque...
Tipo: Journal Contribution
Palavras-chave: Density; Hermaphroditism.
Ano: 2013
URL: http://hdl.handle.net/1834/5454

Réponse des différents taxons méiofaunistiques à la contamination par un antibiotique (la Penicilline G) : étude microcosmique.
Provedor de dados: 20
Autores: Nasri, A.; Boufahja, F.; Hedfi, A.; Mahmoudi, E.; Aissa, P.; Essid, N.
Une étude microcosmique a été réalisée pour déterminer l’effet d’un antibiotique (la Pénicilline G) sur une communauté méiofaunistique prélevée au niveau des sédiments de la lagune de Bizerte (Nord de la Tunisie).Cinq doses croissantes de ce contaminant émergent (D1 : 3 mg.L-1, D2 : 30 mg. L-1, D3 : 300 mg. L-1, D4 : 600 mg. L-1 et D5 : 700 mg. L-1), ont été mises en examen pendant 30 jours d’exposition. Les densités méiofaunistiques moyennes ont été très fluctuantes en comparant les microcosmes témoins avec ceux traités. Les microcosmes témoins ont été associés à une densité moyenne de 91 ± 22 ind. mic-1. Une prolifération numérique de la méiofaune a été observée lors de son exposition aux doses les plus faibles du contaminant. Ainsi, une valeur moyenne...
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Density; Microcosms; Sediments.
Ano: 2013
URL: http://hdl.handle.net/1834/5907

Distribución espacial de la densidad de Thalassia testudinum en un perfil en el Golfo de Batabanó, Cuba
Provedor de dados: 20
Autores: Piñeiro, O.; Dumas, D.
Se presenta un análisis sobre la distribución espacial de la densidad de Thalassia testudinum en un perfil que cubre una porción del Golfo de Batabanó, en el período de mayo de 2005. Se establecieron diez estaciones de muestreo donde se tomaron aleatoriamente cuatro réplicas en cada una, con un cuadrante de 25x25 cm². Como criterio de densidad se empleó el número de haces por unidad de área. Las variables ambientales registradas fueron: temperatura del agua, salinidad, profundidad y transparencia. El promedio de salinidad obtenido (38,6 ups) se encuentra por encima del rango óptimo (24-35 ups) para el desarrollo de esta planta y es mayor que el registrado antiguamente en la zona (36 ups), al parecer asociado al represamiento de los ríos. En el Análisis de...
Tipo: Preprint
Palavras-chave: Density; Density; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 2010
URL: http://hdl.handle.net/1834/3541

Corales, formaciones arrecifales y blanqueamiento de 1987 en Bahía Portete (Guajira, Colombia)
Provedor de dados: 20
Autores: Solano-P., Oscar D.
Para el reconocimiento y caracterización de las formaciones arrecifales de Bahía Pórtete se visitaron un total de 22 estaciones entre junio de 1987 y enero de I988. Se registraron por primera vez Acropora cervicomis, Agaricia agaricites, Montastrea cavernosa, Diploría clivosa e Isophyllia sinuosa, elevando a 18 el número de especies de escleractinios de la bahía. El componente principal por su abundancia y diversidad de formas fue el hidrocoral Millepora alcicomis. Las formaciones arrecifales del área se concentran sobre los costados oeste y suroeste, sin llegar a constituirse en verdaderos arrecifes. Estructuralmente se discriminan dos tipos de formaciones: tipo 1 parches arrecifales y tipo 2 praderas de fanerógamas con colonias dispersas de M. alcicomis....
Tipo: Journal Contribution
Palavras-chave: Bleaching; Ecology; Geographical distribution; Habitat; Population structure; Population dynamics; Turbidity; Density; Species diversity; Ecology; Geographical distribution; Population structure; Turbidity; Bleaching; Population dynamics; Density; Species diversity; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_15043; Http://aims.fao.org/aos/agrovoc/c_953; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 1994
URL: http://hdl.handle.net/1834/3782

Manejo de una dieta alternativa en la alimentación de  Litopenaeus vannamei  durante su engorde en estanques de tierra fertilizados
Provedor de dados: 20
Autores: Pelegrín, E.; Alvarez, J.S.; Galindo, J.
Con el interés de reducir los costos de alimentación del camarón blanco del Pacífico  Litopenaeus vannamei  en Cuba  se desarrolló un estudio en jaulas de 1 m2  de malla  raschel de 0.5 mm de luz de malla, situados dentro de un estanque de tierra, comercial en  la camaronera Cultizaza, Sancti Spiritus. Se evaluaron cinco combinaciones de alimentos  balanceados: 100 % alimento comercial importado, usado como dieta control (DC); 70 %  DC y 30 % de alimento alternativo nacional (DA); 50 % DC y 50 % DA; 30 % DC y 70 %  DA y 100 % DA, con densidades de siembra de 10 y 15 camarones/m2 . Se determinó que  no existe interacción entre los factores esquema de alimentación y densidad de siembra.  Los resultados indicaron que la combinación de 70 % dieta control y 30...
Tipo: Journal Contribution
Palavras-chave: Food; Artificial feeding; Density; Food; Density; Http://aims.fao.org/aos/agrovoc/c_9001003; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 2011
URL: http://hdl.handle.net/1834/4007

Composición y densidad de corales juveniles en dos arrecifes profundos de San Andrés Isla, Caribe colombiano
Provedor de dados: 20
Autores: Vidal, A.M.; Villamil, C.M.; Acosta, A.
Coral recruitment determines the maintenance, renovation and future of the coral community. In order to determine the composition, density and importance value of scleractinian juvenile corals (&lt;2 or &lt; 4 cm of diameter; depending of the species) two localities were sampled (Reggae Nest and El Faro) at the deep leeward terrace site of San Andres Island. Also, in 47 quadrants of 1m2 distributed throughout a guide line, frequency of partial mortality, total diseases and depredation signs in juvenile corals were quantified. A total of 397 juveniles of 16 species were  egistered. The average density and richness of juveniles were not significantly different between Reggae Nest and El Faro. The average density of both localities was high compared to other...
Tipo: Journal Contribution
Palavras-chave: Juveniles; Composition; Density; Coral; Density; Juveniles; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_25393.
Ano: 2005
URL: http://hdl.handle.net/1834/2015

Estructura y regeneración del bosque de la Ciénaga de Chololón, Isla Barú, Parque Nacional Natural Corales del Rosario y San Bernardo, Caribe Colombiano
Provedor de dados: 20
Autores: Osorno Arango, A. M.; Valle, A. G.; Gil Agudelo, D. L.
Los manglares son ecosistemas que representan un enlace relevante en el ambiente de transición entre los medios marino y terrestre; poseen gran importancia a nivel biológico y socio-económico, siendo un ecosistema marino estratégico. A lo largo de la costa Caribe colombiana hay varias ciénagas o lagunas costeras en cuyo borde se han establecido diversos bosques de manglar, algunos de los cuales hasta el momento no cuentan con suficiente información cienífica que los describa a nivel cualitativo  y que represente sus procesos biológicos y los caracterice en forma cuantitativa. El presente trabjao de investigación contribuye al conocimiento actual de la estructura, distribución, abundancia y capacidad de regeración del bosque de manglar que circunda la...
Tipo: Journal Contribution
Palavras-chave: Mangroves; Structures; Density; Growth.
Ano: 2011
URL: http://hdl.handle.net/1834/4408

Ecología del cangrejo violinista Uca uruguayensis: distribución, comportamiento reproductivo y su interacción con aves migratorias.
Provedor de dados: 20
Autores: Ribeiro, P.D.
Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales (Argentina)
Tipo: Theses and Dissertations
Palavras-chave: Ecology; Density; Distribution; Reproductive behaviour; Interspecific relationships; Abundance; Trophic relationships; Predation; Environmental conditions; Distribution; Reproductive behaviour; Ecology; Predation; Density; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_37902; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_6162; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_32980.
Ano: 2004
URL: http://hdl.handle.net/1834/2960

Estimación cualitativa y cuantitativa del macrozoobentos en la macrolaguna del Golfo de Batabanó, Cuba
Provedor de dados: 20
Autores: Hidalgo Rodríguez, G.; Areces Mallea, A.
The Gulf of Batabano is an important region of the Cuban shelf, which environmental conditions are aim of several ecological assessments. In order to contribute to the characterization of their benthic communities, the structure of the macrofauna in sediments of this shallow-water ecosystem was determined. Higher diversity and abundance of macrofauna were registered in sandy and mixed with vegetation substrates, mainly dominated by polychaetes and crustaceans. Biomasses did not show a particular distributional pattern. The observed increases of densities and biomasses in November could be associated to a regular seasonal variation.
Tipo: Journal Contribution
Palavras-chave: Density; Biomass; Biomass; Density; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 2009
URL: http://hdl.handle.net/1834/3450

Quantitative data on the forest structure of a small mangrove formation in the Bay of Nenguage, Colombian Caribbean
Provedor de dados: 20
Autores: García, Camilo B.
Esta nota aporta información cuantitativa sobre la estructura de la pequeña formación de manglar que se encuentra sobre el costado oriental de la Bahía de Nenguange, Parque Nacional Natural Tayrona, con el fin de proporcionar un punto de comparación para eventuales estudios futuros. Se presentan datos sobre zonación, densidad, cubrimiento, altura, diámetro a la altura del pecho y área basal.
Tipo: Journal Contribution
Palavras-chave: Mangroves; Ecological zonation; Density; Ecological zonation; Mangroves; Density; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_16190; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 1994
URL: http://hdl.handle.net/1834/3751

Evaluación de diferentes densidades de la microalga Nannochloropsis oculata como alimento Paraartemia
Provedor de dados: 20
Autores: Tizol-C., Rafael.
Laboratory experimente were carried out to determine the possibility of using the microalgae Nannochloropsis oculata as a food source for brine shirmp. Among the range concentrations studied (3 x 105 to 14 x 105 cells/ml), 12 x 105 cells/ml offered the best resulte of survival and growth rate and it is recommended as the most effective. From correlation matrix, high valúes (r &gt; 0.90; a = 0.05) were obtained for the relation of microalgae concentration and survival, growth rate and the variation of average lenght. The mínimum cellular concentration of microalgae which is necessary for brine shrimp culture ¡s 5.6 x 105 cells/ml
Tipo: Journal Contribution
Palavras-chave: Density; Food; Growth rate; Food; Density; Growth rate; Http://aims.fao.org/aos/agrovoc/c_9001003; Http://aims.fao.org/aos/agrovoc/c_2186; Http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 1994
URL: http://hdl.handle.net/1834/3771

Efecto de la densidad de siembra sobre el crecimiento y supervivencia de Nodipecten nodosus (Bivalvia: Pectinidae) en un nuevo arte de cultivo
Provedor de dados: 20
Autores: López-Navarro, Johann; Gómez-León, Javier; Castellanos-Romero, Claudia; Acosta-Ortíz, Ernesto.
Como un aporte para determinar la factibilidad biológica y tecnológica del cultivo de Nodipecten nodosus en el Caribe colombiano, entre abril y noviembre de 2007 se evaluó el efecto de dos densidades de cobertura (30 y 50 %) sobre su crecimiento y supervivencia. En jaulas suspendidas en el mar a 5 m de profundidad se colocaron juveniles entre 60 y 65 mm de longitud. Se realizaron mediciones quincenales de la longitud de la concha y de la supervivencia. De igual manera se registró la temperatura, salinidad, seston total y materia orgánica particulada para determinar la relación presentada con estos factores; N. nodosus alcanzó una longitud de 84.7 y 87.9 mm a 30 y 50 % de densidad, espectivamente. Los tratamientos (30 y 50 %) no difirieron en la...
Tipo: Journal Contribution
Palavras-chave: Growth; Survival; Density; Mollusc culture; Mollusc culture; Growth; Survival; Density; Http://aims.fao.org/aos/agrovoc/c_4896; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_7538; Http://aims.fao.org/aos/agrovoc/c_2186.
Ano: 2010
URL: http://hdl.handle.net/1834/3775

Capacité des moules dans la réduction des teneurs en nutriments et la charge bactérienne dans les effluents piscicoles
Provedor de dados: 20
Autores: Chebil Ajjabi, L.; Romdhane, M.S.; El Abed, A.
L’effluent des élevages de poissons renferme des concentrations plus élevées en nutriments dissous et en particules en suspension que celles présentes dans l’eau entrante. Cet état entraine par conséquent, des problèmes d’ordre environnementaux affectant les eaux côtières dues à l’eutrophisation et l’augmentation de la turbidité. Afin d’améliorer la qualité de l’effluent avant son déversement dans le milieu naturel, l’utilisation des bivalves comme filtre biologique est une alternative adéquate. Cette étude analyse la capacité de la moule Mytilus galloprovincialis de réduire les teneurs en sels nutritifs et la charge bactérienne dans les effluents de loups Dicentrarchus labrax en élevage. L’effluent issu des bassins de grossissement est pompé directement...
Tipo: Journal Contribution
Palavras-chave: Aquaculture effluents; Bacteria; Biofilters; Chlorophylls; Chlorophylls; Culture effects; Density; Effluents; Filtration; Fish; Mussel culture; Nitrogen; Nutrients (mineral); Phosphorus; Suspended particulate matter; Wastewater recycling; Wastewater treatment; Water quality; Fish; Nitrogen; Phosphorus; Water quality; Mussels; Nutrients; Bacteria; Chlorophylls; Density; Effluents; Filtration; Wastewater treatment.
Ano: 2008
URL: http://hdl.handle.net/1834/3756

Nematodes as indicators pollution: a case study from the Swartkops River system, South Africa
Provedor de dados: 27
Autores: Gyedu-Ababio, T.; Furstenberg, J.P.; Baird, D.J.; Vanreusel, A.
Nematodes from the sediments of the Swartkops estuary in Port Elizabeth, South Africa were investigated at 10 selected sites along a salinity gradient in the subtidal region at neap tide. The relation between nematode density, genera, community structure and environmental parameters including concentrations of seven heavy metals, Mn, Ti, Cr, Pb, Fe, Sn and Zn in the sediment were investigated. The nematode community structure was significantly influenced by the chlorophyll a concentration and sediment particle-size distribution. The number of genera had significant negative correlation with chlorophyll a and two heavy metals, Fe and Zn in the sediment. The habitat preferences of the genera were also assessed. A combination of the Shannon-Wiener Diversity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Check lists; Density; Diversity; Ecology; Meiobenthos; Pollution; Sediment; Sediments; Nematoda [Nematodes].
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7328

Variação radial e longitudinal da massa específica básica da madeira de Araucaria angustifolia com diferentes idades
Provedor de dados: 190
Autores: Zaque, Leonardo Antônio Moraes; Ferreira, Mayra Daniela; Melo, Rafael Rodolfo.
A massa específica da madeira é uma das propriedades mais importantes do ponto de vista prático, sendo utilizada como principal indicador para diversos tipos de uso. No entanto, mesmo se tratando de uma única espécie, esse parâmetro pode variar ao longo do fuste, seja no sentido base-topo e/ou medula-casca. Deste modo, a sua determinação torna-se essencial para qualificação da madeira de qualquer espécie florestal. O presente estudo teve como objetivo avaliar as variações radial e longitudinal da massa específica básica da madeira de Araucaria angustifolia (Bert.) O. Kuntze. para indivíduos de diferentes idades. Para isso, foram abatidas doze árvores com as idades de 23, 25, 28 e 30 anos. Foram retirados discos a 10%, 35%, 55% e 75% da altura total de cada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Propriedades físicas; Medula; Densidade Physical properties; Pith; Density.
Ano: 2018
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1368

Tiller size/density compensation in grazed Tifton 85 bermudagrass swards
Provedor de dados: 86
Autores: Sbrissia,André Fischer; Silva,Sila Carneiro da; Matthew,Cory; Carvalho,Carlos Augusto Brandão de; Carnevalli,Roberta Aparecida; Pinto,Luiz Felipe de Moura; Fagundes,Jaílson Lara; Pedreira,Carlos Guilherme Silveira.
The objective of this study was to evaluate the occurrence of the tiller size/density compensation mechanism in Tifton 85 bermudagrass swards grazed by sheep under continuous stocking. Treatments corresponded to four sward steady state conditions (5, 10, 15, and 20 cm of sward surface height), maintained by sheep grazing. The experimental design was a complete randomized block with four replicates. Pasture responses evaluated include: tiller population density, tiller mass, leaf mass and leaf area per tiller, and herbage mass. Tiller volume, leaf area index, tiller leaf/stem ratio, and tiller leaf area/volume ratio were calculated and simple regression analyses between tiller population density and tiller mass were performed. Measurements were made in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cynodon; Leaf area index; Mass; Density; Plant morphology.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003001200013

Euschistus heros mass rearing technique for the multiplication of Telenomus podisi
Provedor de dados: 86
Autores: Silva,Cleonor Cavalcante; Laumann,Raul Alberto; Blassioli,Maria Carolina; Pareja,Martin; Borges,Miguel.
The objective of this work was to improve the mass rearing technique of Euschistus heros in laboratory. Nymphs and adults were reared at densities 100, 200, 300 and 400 eggs per Petri dish (9 cm diameter), and at 50, 100, 150 and 200 couples per rearing cages (900 mL), respectively. Survival rate of immature stages and survivorship and reproduction of adults were determinated. Survivorship of nymph to adult was the highest (89%) at density 100 eggs per dish. Adult survivorship was independent of density, and 100 couples per cage were the best to improve quality of the produced progeny. In these conditions, fecundity was 160.8±9.28 eggs per female, and a total of 8,950±456 eggs per cage per month was produced. Two hundred couples per cage showed a negative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Density; Egg parasitoid; Neotropical brown stink bug.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000500004

Comparison of microscopic method and computational program for pesticide deposition evaluation of spraying
Provedor de dados: 86
Autores: Chaim,Aldemir; Pessoa,Maria Conceição Peres Young; Camargo Neto,João; Hermes,Luiz Carlos.
The main objective of this work was to compare two methods to estimate the deposition of pesticide applied by aerial spraying. Hundred and fifty pieces of water sensitive paper were distributed over an area of 50 m length by 75 m width for sampling droplets sprayed by an aircraft calibrated to apply a spray volume of 32 L/ha. The samples were analysed by visual microscopic method using NG 2 Porton graticule and by an image analyser computer program. The results reached by visual microscopic method were the following: volume median diameter, 398±62 mum; number median diameter, 159±22 mum; droplet density, 22.5±7.0 droplets/cm² and estimated deposited volume, 22.2±9.4 L/ha. The respective ones reached with the computer program were: 402±58 mum, 161±32 mum,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural chemicals; Aerial application; Application methods; Density; Volume.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000400010

Phytosociological surveys: tools for weed science?
Provedor de dados: 87
Autores: Concenço,G.; Tomazi,M.; Correia,I.V.T.; Santos,S.A.; Galon,L.
In simple terms, a phytosociological survey is a group of ecological evaluation methods whose aim is to provide a comprehensive overview of both the composition and distribution of plant species in a given plant community. To understand the applicability of phytosociological surveys for weed science, as well as their validity, their ecological basis should be understood and the most suitable ones need to be chosen, because cultivated fields present a relatively distinct group of selecting factors when compared to natural plant communities. For weed science, the following sequence of steps is proposed as the most suitable: (1) overall infestation; (2) phytosociological tables/graphs; (3) intra-characterization by diversity; (4) inter-characterization and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed community; Density; Frequency; Dominance; Diversity; Similarity.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200025

Weed Management in Wheat by Cuscuta Alone and in Combination with Commercial Weedicides Allymax and Axial
Provedor de dados: 87
Autores: ABDULLAH,Y.; BALOCH,M.S.; SHAH,A.N.; HASHIM,M.M.; NADIM,M.A.; ULLAH,G.; KHAN,A.A.; SHAHZAD,M.F.
ABSTRACT: The present study was to assess the additive effects of cuscuta (akasbel) aqueous extract alone and in combination with full and reduced doses of commercially available weedicides against weeds in wheat crop during the year 2016-2017. The study was conducted in a randomized complete block design (RCBD) with 3 replications. The results showed that hand weeding and use of weedicides Allymax and Axial (full and half recommended doses) significantly controlled all prevailing weeds and increased yield and yield contributing parameters over the weedy check/control and sole application of cuscuta aqueous extract. Hand weeding and Allymax (full dose) showed minimum weed population, relative density, fresh and dry weed biomass and higher leaf area index...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wheat; Weedicides; Management; Density.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100230

Effects of weed species competition on the growth of young coffee plants
Provedor de dados: 87
Autores: Ronchi,C.P.; Silva,A.A.
The effects of competition of seven weed species on the growth of coffee plants were evaluated under greenhouse conditions. Thirty days after coffee seedling transplantation into 12 L pots with soil level area of 6.5 dm², weeds were transplanted into or sown in those pots, at densities of 0, 1, 2, 3, 4 and 5 plants per pot. Competition or weedy periods from weed transplantation or emergence to plant harvesting, at weed pre-flowering stage, were: 77 days - Bidens pilosa, 98 days - Brachiaria decumbens, 180 days - Commelina diffusa, 82 days - Leonurus sibiricus, 68 days - Nicandra physaloides, 148 days - Richardia brasiliensis and 133 days - Sida rhombifolia. Coffee plant height, stem diameter, leaf number and shoot dry matter were determined. Effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Coffea arabica; Competition; Weedy period.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582006000300001

Redroot pigweed interference with lettuce crop
Provedor de dados: 87
Autores: Casadei,Eloisa; L. Bacha,Allan; S. Rodrigues,Juliana; S. Santos,Renata T.; L.C.A. Alves,Pedro; B.C. Filho,Arthur.
Abstract  Background:  Lettuce-production areas in Brazil are frequently infested by pigweed plants, which can interfere with production by competing for resources or releasing allelopathic compounds in the environment.  Objective:  The present study evaluated the effect of redroot pigweed (Amaranthus retroflexus) density and distribution on lettuce crop (Lactuca sativa L.).  Methods:  The cultivars Lídia, Verônica, Lucy Brown and Salad Bowl were used. After transplanting, these plants coexisted until harvest with four pigweed plants (equivalent to 16 plants m-2) located within or outside planting rows, or with one pigweed plant located at the center of the plot (4 plants m-2), as well as a control without weed. The experiment was conducted in an open and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa L.; Amaranthus retroflexus; Competition; Weeds; Density; Distribution.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100308

Understanding the Competitive Effects of Blessed Milkthistle Densities on Wheat
Provedor de dados: 87
Autores: REHMAN,A.; QAMAR,R.; SAFDAR,M.E.; JAVEED,H.M.R.; SHEHZAD,M.; ALI,M.; ASIF,M.; TARAR,Z.H.; AHMED,A.; JAMIL,M.
ABSTRACT: Weed-induced yield loss in wheat crop is a great threat to food security in Pakistan. A comprehensive understanding of weed-crop competition is very important to develop sustainable and cost-effective weed management. For this purpose, two-year field studies were conducted to determine the effect of different blessed milkthistle densities on the phenology and yield of wheat crop in a rice-wheat cropping scheme in Sargodha, Pakistan during 2013-2014 and 2014-2015. The experiment comprised seven treatments: control (weed free), weedy check (weedy without any control) and blessed milkthistle densities of 5, 10, 15, 20 and 25 plants m-2. In response to increasing weed density, a gradual reduction in yield and yield-related traits of wheat was noted....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blessed milkthistle; Density; Phenology; Rice-wheat cropping systems; Yield.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100210

Interference of Broadleaf Buttonweed and White-Eye in Soybean
Provedor de dados: 87
Autores: DIESEL,F.; TREZZI,M.M.; GALLON,M.; MIZERSKI,P.H.F.; BATISTEL,S.C.; PAGNONCELLI,F.B.
ABSTRACT: Weed species is one of the factors contributing to grain yield losses due to crop-weed competition. Two of the most common weeds of soybean fields in Brazil are from the Rubiaceae family: Borreria latifolia and Richardia brasiliensis. This study aimed to evaluate the effects of B. latifolia and R. brasiliensis on plant development, yield components, and soybean productivity. Two assays were conducted in a randomized block design with four replications, using a two-level factorial design, in which the first factor consisted of the species B. latifolia and R. brasiliensis and the second factor consisted of the densities 0, 2, 4, 6, 8, 10, and 12 plants m-2. Plant height, leaf area and total chlorophyll in the V6 and R5 stages, number of pods per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Interspecific competition; Glycine max; Richardia brasiliensis; Borreria latifolia; Density.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100222

Quantifying seed production by volunteer canola (Brassica napus) and Sinapis arvensis
Provedor de dados: 87
Autores: Soltani,E; Soltani,A; Galeshi,S; Ghaderi-far,F; Zeinali,E.
Volunteer canola (Brassica napus) and Sinapis arvensis are well identified weeds of different cropping systems. Quantitative information on regarding seed production by them is limited. Such information is necessary to model dynamics of soil seed banks. The aim of this work was to quantify seed production as a function of the size of those weeds. A wide range of plant size was produced by using a fan seeding system performed at two sowing dates (environments). Plant size varied from 3 to 167 g per plant for canola and from 6 to 104 g per plant for S. arvensis. Seed production ranged from 543 to14,773 seeds per plant for canola, and from 264 to 10,336 seeds per plant for S. arvensis. There was a close relationship between seed production per plant and plant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weed; Plant size; Density; Planting.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300003

Economics of Sourcing Cellulosic Feedstock for Energy Production
Provedor de dados: 31
Autores: Gustafson,   Cole R.; Maung,   Thein A.; Saxowsky,   David M.; Nowatzki,   John; Miljkovic,   Tatjana.
This study investigates the economics of supplying wheat straw and corn stover within 100 mile radius of a potential new biorefinery in southeast North Dakota. In particular, straw and stover total delivery costs, potential straw and stover supply sites and least cost transportation routes are identified using a linear programming transport model and a GIS (Geographic Information Systems) mapping system. We show that USDA/NRCS (Natural Resources Conservation Service) future crop residue removal rate policies will be important for determining whether it is economically viable to harvest crop residues as potential feedstock for energy generation. Increase in residue removal rates narrow the size of residue supply areas and consequently result in lowering...
Tipo: Conference Paper or Presentation
Palavras-chave: Wheat Straw; Corn Stover; Density; Transportation Cost; GIS; Community/Rural/Urban Development; Crop Production/Industries.
Ano: 2011
URL: http://purl.umn.edu/103260

Farmland Preservation and Residential Density: Can Development Rights Markets Affect Land Use?
Provedor de dados: 31
Autores: McConnell,   Virginia D.; Kopits,   Elizabeth; Walls,   Margaret.
This paper examines transferable development rights (TDRs) policies as a way to preserve farmland and change the density of development. Characteristics of TDR markets are described, including why they might promote efficiency, and the difficulties that arise in implementing them. Evidence from an established TDR program in Calvert County, Maryland, is used to assess the potential for TDRs to influence subdivision density, and to achieve local land preservation goals. The Calvert program has succeeded in creating an active and stable TDR market, and has therefore preserved a large amount of farmland in the region. But we find that the demand for additional density permitted with TDRs occurs mostly in rural areas and not in the higher density town centers...
Tipo: Journal Article
Palavras-chave: Land preservation; Development; Markets; Density; Land Economics/Use.
Ano: 2005
URL: http://purl.umn.edu/10240

Making Markets for Development Rights Work: What Determines Demand?
Provedor de dados: 31
Autores: Kopits,   Elizabeth; McConnell,   Virginia D.; Walls,   Margaret.
Many economists see current land use patterns as inefficient due to various market failures, and planners argue that current patterns do not follow sound planning practice. One policy of interest to both groups is transferable development rights (TDR). TDRs allow the development rights from land that is preserved in an undeveloped state to be transferred to other areas where development can be made denser. This paper addresses one of the greatest difficulties TDR programs face-insufficient demand. We develop a simple theoretical model and estimate a TDR demand function using data from Calvert County, Maryland, one of the only regions where data on individual sales are available. We find that baseline zoning is a critical determinant of TDR demand- demand...
Tipo: Working or Discussion Paper
Palavras-chave: TDRs; Density; Zoning; Subdivisions; International Development; R14; R52; R21.
Ano: 2005
URL: http://purl.umn.edu/10880

Plant species and habitat structure in a sand dune field in the brazilian Caatinga: a homogeneous habitat harbouring an endemic biota
Provedor de dados: 88
Autores: Rocha,Pedro Luís B. da; Queiroz,Luciano P. de; Pirani,José Rubens.
One dune habitat in the semi-arid Caatinga Biome, rich in endemisms, is described based on plant species composition, woody plant density, mean height and phenology and a multivariate analysis of the micro-habitats generated by variables associated to plants and topography. The local flora is composed mainly by typically sand-dweller species of Caatinga, suggesting the existence of a phytogeographic unity related to the sandy areas in the Caatinga biome, which seems to be corroborated by faunal distribution. Moreover, some species are probably endemic from the dunes, a pattern also found in vertebrates. The plant distribution is patchy, there is no conspicuous herbaceous layer and almost 50% of the ground represents exposed sand. Phenology is not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Endemic species; Phenology; Phytogeography; Semiarid.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400013

Evaluation of the technical and economic impacts of high-density broiler production in an integrated system
Provedor de dados: 89
Autores: Schmidt,GS.
This study included 35 farmers contracted by a broiler integrator company. Each farmer owned an average of seven poultry houses, housing six flocks per year per farmer, summing up 4.0 million broilers housed. Live performance was evaluated in flocks housed in three densities (D1&lt;12, 12&lt;D2&lt;14, and D3&gt;14 birds/m2), and included the following parameters: market age (MA), average flock weight (AFW), average daily gain (DWG), feed conversion ratio (FCR), livability (LB), production efficiency index (PEI) and carcass yield/m2 (CY). Production costs and gross margin were calculated with birds housed at two densities (11.5&lt;D4&lt;12.4 and 14.5&lt;D5&lt;15.5birds/m2), standardizing MA to 44 days. The economic evaluation included 15 farmers and 1.0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Density; Economic indices; Integration; Performance parameters.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000300002

INTERNAL STRUCTURE OF A VERMICULAR IRONSTONE AS DETERMINED BY X-RAY COMPUTED TOMOGRAPHY SCANNING
Provedor de dados: 90
Autores: Zinn,Yuri Lopes; Carducci,Carla Eloize; Araujo,Marla Alessandra.
Ironstones or petroplinthites are common materials in soils under humid tropical climate, generally defined as the result of Fe oxide accumulation in areas where the water table oscillates, and may exhibit considerable morphological variability. The aim of this study was to examine the internal structure and porosity of an ironstone fragment from a Petroferric Acrudox in Minas Gerais, Brazil, by computed tomography (CT) and conventional techniques. The sample analyzed had total porosity of 59.5 %, with large macropores in the form of tubular channels and irregular vughs, the latter with variable degrees of infilling by material released from the ironstone walls or the soil matrix. The CT scan also showed that the ironstone has wide variation in the density...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Laterite; Soils with plinthite; Density; Mineralogy.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200345

Mineralogy of the clay fraction of alfisols in two slope curvatures: IV - spatial correlation with physical properties
Provedor de dados: 90
Autores: Camargo,Livia Arantes; Marques Júnior,José; Pereira,Gener Tadeu.
Although the influence of clay mineralogy on soil physical properties has been widely studied, spatial relationships between these features in Alfisols have rarely been examined. The purpose of this work was to relate the clay minerals and physical properties of an Alfisol of sandstone origin in two slope curvatures. The crystallographic properties such as mean crystallite size (MCS) and width at half height (WHH) of hematite, goethite, kaolinite and gibbsite; contents of hematite and goethite; aluminium substitution (AS) and specific surface area (SSA) of hematite and goethite; the goethite/(goethite+hematite) and kaolinite/(kaolinite+gibbsite) ratios; and the citrate/bicarbonate/dithionite extractable Fe (Fe d) were correlated with the soil physical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregates; Mineral crystallinity; Density; Porosity; Penetration resistance; Cross-semivariogram.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200002

Attributes of irrigated rice as affected by soil sodicity and potassic fertilizer application
Provedor de dados: 90
Autores: Carmona,Felipe de Campos; Anghinoni,Ibanor; Holzschuh,Marquel Jonas; Martins,Amanda Posselt.
Soils of the coastal plains of Rio Grande do Sul, Brazil, are affected by salinization, which can hamper the establishment and development of crops in general, including rice. The application of high doses of KCl may aggravate the crop damage, due to the high saline content of this fertilizer. This study aimed to evaluate the effect of K fertilizer management on some properties of rice plant, grown in soils with different sodicity levels, and determine which attribute is best related to yield. The field study was conducted in four Albaqualfs with exchangeable Na percentages of 5.6, 9.0, 21 and 32 %. The management of KCl fertilizer consisted of the application of 90 kg ha-1 K2O broadcast, 90 kg ha-1 K2O in the row and 45 kg ha-1 K2O in the row + 45 kg ha-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sodium; Potassium; Oryza sativa L.; Density; Spikelet sterility; Grain yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300023

Revisiting the S-index for soil physical quality and its use in Brazil
Provedor de dados: 90
Autores: Jong van Lier,Quirijn de.
The S-index was introduced in 2004 in a publication by A.R. Dexter. S was proposed as an indicator of soil physical quality. A critical value delimiting soils with rich and poor physical quality was proposed. At present, Brazil is world leader in citations of Dexter's publication. In this publication the S-theory is mathematically revisited and extended. It is shown that S is mathematically correlated to bulk density and total porosity. As an absolute indicator, the value of S alone has proven to be incapable of predicting soil physical quality. The critical value does not always hold under boundary conditions described in the literature. This is to be expected because S is a static parameter, therefore implicitly unable to describe dynamic processes. As a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosity; Density; Water retention curve; Compaction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100001

Mortality of insects and quality of maize grains in hermetic and non-hermetic storage
Provedor de dados: 91
Autores: Viebrantz,Priscila C.; Radunz,Lauri L.; Dionello,Rafael G.
ABSTRACT Due to the need to improve the quality and safety of foods, chemical methods used to control grain pests have been replaced by alternative methods. For example, modified atmosphere within the storage units has been used. Therefore, the objective was to evaluate maize grain quality and mortality of insects of the species Sitophilus zeamais and Tribolium castaneum in hermetic and non-hermetic environments for 50 days of storage. The hermetic units consisted of polyethylene "bags" with capacity for 60 kg. A cage with 20 adults of each species and 200 g of maize was placed inside each unit. The oxygen level was quantified every five days. Evaluations of insect mortality and survival occurred at 10, 20, 30, 40 and 50 days of storage. At 0, 30 and 50...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain storage; Modified atmosphere; Pest control; Fungal incidence; Density.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500487

Survival of the copepod Mesocyclops longisetus during simulations of transport from hatchery to target areas for biological control of mosquito larvae
Provedor de dados: 103
Autores: Nunes-Silva,Aline; Lima-Keppe,Isabela de; Souza,Robson V. de; Perbiche-Neves,Gilmar.
ABSTRACT Copepods have been successfully used in many countries for the biological control of larvae of mosquitoes that vector diseases. In Brazil, this line of research has been focused on the use of the copepod Mesocyclops longisetus (Thiébaud, 1914) for the biological control of the mosquito Aedes aegypti (Linnaeus, 1792). The transportation of the copepods from the place where they are reared to where they will be used often involves long distances for extended periods of time. This study assesses the survivorship of M. longisetus during simulation of transport under different conditions. Different loading densities (20, 30, 40, 80, and 120 ind.L) and stirring times (30 minutes, one hour, two hours, and four hours) were tested. Survivorship was high,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Copepoda; Culicidae; Density.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702020000100309

Ecology of Ischnocnema parva (Anura: Brachycephalidae) at the Atlantic Rainforest of Serra da Concórdia, state of Rio de Janeiro, Brazil
Provedor de dados: 103
Autores: Martins,Ana Cristina J. S.; Kiefer,Mara C.; Siqueira,Carla C.; Van Sluys,Monique; Menezes,Vanderlaine A.; Rocha,Carlos Frederico D.
Ischnocnema (Brachycephalidae) includes many species that are important members of the leaf litter frog communities in the Atlantic Rainforest of Brazil. Ischnocnema parva (Girard, 1853) is endemic to the Atlantic Rainforest biome and is restricted to the forests of southeastern Brazil. Currently, the available information about the ecology of I. parva is scarce. We studied the diet, the habitat use, reproduction and density of I. parva in an area of Atlantic Rainforest at the Concórdia mountain range, Rio de Janeiro. Individuals of I. parva were captured in April 2005 using different sampling methods: time constrained search (transects), plots of 5 x 5 m (25 m²) on the litter, and pitfall traps with drift fences. We found 240 frogs; 35 females and 205...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activity; Density; Diet; Habitat use; Reproduction.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000200007

Seasonal variation in the leaf-litter frog community (Amphibia: Anura) from an Atlantic Forest Area in the Salto Morato Natural Reserve, southern Brazil
Provedor de dados: 103
Autores: Santos-Pereira,Manuela; Candaten,Adriane; Milani,Douglas; Oliveira,Frederico B.; Gardelin,Joana; Rocha,Carlos F. D. da.
In this study we provide the first data regarding community parameters of leaf-litter anurans inhabiting a forest floor in the state of Paraná, southern Brazil, including information on community species richness, composition, specific density and biomass. Our study was conducted at Salto Morato Natural Reserve using forty plots of 4 x 4 m for each one of the four seasons (winter, spring, summer and autumn), totaling 2.560 m² of forest floor sampled. We sampled a total of 96 frogs inhabiting the forest floor, belonging to seven species: Brachycephalus hermogenesi (Giaretta &amp;amp; Sawaya, 1998), Ischnocnema guentheri (Steindachner, 1864), Haddadus binotatus (Spix, 1824), Leptodactylus gr. marmoratus, Physalaemus spiniger (Miranda-Ribeiro, 1926),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Rainforest; Density; Richness; Seasonality.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000600008

Kelp gulls, Larus dominicanus (Aves: Laridae), breeding in Keller Peninsula, King George Island, Antarctic Peninsula
Provedor de dados: 103
Autores: Branco,Joaquim O.; Costa,Erli S.; Araujo,Jansen de; Durigon,Edison; Alves,Maria Alice S.
We examined the distribution, abundance and density of the Kelp Gull, Larus dominicanus (Lichtenstein, 1823), at Keller Peninsula on two occasions during the breeding season of 2007-2008 (once for incubation and once for chick stages) and compared our results with previously published data. We present information on the number of eggs, incubation success, and initial development of L. dominicanus chicks in the studied sites. The abundance and density of the species has remained statistically similar in Keller Peninsula over the last 30 years (since 1978-1979). Although the abundance and density were almost unchanged, we recorded alterations in the occupation of the breeding areas by L. dominicanus, mainly the abandonment of breeding sites in the eastern...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Breeding sites; Broods development; Density; Distribution.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300021

Fish community structure in San Agustín Bay, Huatulco, Mexico
Provedor de dados: 97
Autores: RAMÍREZ-GUTIÉRREZ,MARTÍN; TAPIA-GARCÍA,MARGARITO; RAMOS-SANTIAGO,EDUARDO; ULLOA,RAÚL.
San Agustín bay is one of the most important bays in the Huatulco National Park because it includes the broadest coral reef surface of this park, which supports a great diversity of fish species. The importance of the present work is that describes quantitatively, for first time, the fish assemblage of this reef area. Visual censuses were realized on transects, according to the coral reef size, on coral and rocky reefs, and coral rubble environments. 64 species, 46 genus and 29 families were registered. Seasonal variation in fish assemblage was observed; reflecting the influence of pelagic shoaling species associated with the Gulf of Tehuantepec upwelling, during the dry season. Thus species were Selar crumenophthalmus, Caranx caninus, and Sardinops...
Tipo: Journal article
Palavras-chave: Huatulco National Park; Coral reef; Diversity; Density; Community.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400003

Ecologia populacional dos Amphipoda (Crustacea) dos fitais de Caiobá, Matinhos, Paraná, Brasil
Provedor de dados: 104
Autores: Dubiaski-Silva,Janete; Masunari,Setuko.
Spalial and temporal density distributions of Amphipoda from the phytals of Caiobá are described. Air temperature oscillated from 16ºC (August and May) to 23ºC (March), surface water temperature from 17ºC (August) to 25ºC (March) and the salinity from 29.3‰ (May) to 32.8‰ (August). Two samples of 25cm² (for algae less than 5cm long), 100 cm² (for algae between 5-10cm long) and whole plants (for algae more than 10cm long) were removed with a spatula from the rocky surface at Caiobá Beach, in August/86, November/86, March/87 and May/87. After sorting, the algal substrata were weighted, their adsorption coefficient calculated and the sediment retained among the thallii weighted. The average distance between the branching was measured for all branched algae....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphipoda; Phytal; Density; Population; Caiobá; Paraná; Brazil.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000200015

Abundance, habitat use and diet of Callicebus nigrifrons Spix (Primates, Pitheciidae) in Cantareira State Park, São Paulo, Brazil
Provedor de dados: 104
Autores: Trevelin,Leonardo C.; Port-Carvalho,Marcio; Silveira,Maurício; Morell,Eduardo.
Between april 2005 and May 2006, according to the pressuposts of line transect methodology, census were carried to estimate abundance and population density of Callicebus nigrifrons Spix, 1823 (Pitheciidae) in Cantareira State Park, State of São Paulo, southeastern Brazil (23°23'42"S, 46°35'27"W). After 275.80 Km of census sampling effort, the titis were the second most abundant primate species, presenting an abundance index of 1.4 groups for each 10 km walked and a density estimate of 12.21 ind./km² (ranging between 8.45 a 17.63 ind./km²). The collection of ancillary data during the census allowed the determination of diet and habitat use by the titis groups, and results show a relative adaptability to disturbed habitats.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Black-fronted titi monkey; Conservation; Density.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000400026

Estrutura populacional de Hyale media (Dana) (Amphipoda, Gammaridea, Hyalidae), habitante dos fitais de Caiobá, Matinhos, Paraná, Brasil
Provedor de dados: 104
Autores: Dubiaski-Silva,Janete; Masunari,Setuko.
A study of correlation between the total body length and the somites length was carried out in a population of Hyale media (Dana, 1857), in order to know which somite or group of somites has the highest correlation index with the total body length. As the sum of the length of the first to fourth pereonites showed the highest linear correlation index (Y=0.0764+0.2736X; r=0.9723), this meristic parameter was chosen to describe the population structure of the species. The following aspects were treated: distribution of the body size classes in the various phytals, population composition, seasonal fluctuation of population density. relative frequency of the ovigerous females and correlation between the body length and the number of eggs inside the marsupium of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyale media; Population; Phytal; Correlation; Density; Matinhos; Brazil.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000100003

Produção e qualidade de sementes de guandu: efeitos de doses de fósforo, potássio e espaçamentos em duas épocas de semeadura - DOI: 10.4025/actasciagron.v30i3.3554
Provedor de dados: 1
Autores: Bertolin, Danila Comelis; UNESP Ilha Solteira; Sá, Marco Eustáquio de; FAE/UNESP; Buzetti, Salatiér; FAE/UNESP; Santiago, Dênis; FAE/UNESP; Barbosa, Rafael Marani; FAE/UNESP.
O presente trabalho teve por objetivo avaliar o efeito de cinco doses de fósforo e quatro doses de potássio, em dois espaçamentos entre linhas e em duas épocas de semeadura na produção e qualidade de sementes de guandu (Cajanus cajan L. Millsp), em Selvíria, Estado do Mato Grosso do Sul. Para a determinação do efeito dos tratamentos, foi utilizado o delineamento em blocos casualizados, em fatorial 2x2x5x4, com quatro repetições, sendo os tratamentos 0, 40, 80, 120 e 160 kg ha-1 de P2O5; 0, 30, 60 e 90 kg ha-1 de K2O; espaçamentos de 0,30 e 0,50 m entre linhas e épocas de semeadura, que foram dezembro de 2003 e fevereiro de 2004. Na primeira semeadura, obteve-se maior produtividade, sendo obtido na segunda semeadura maior qualidade de sementes. No...
Palavras-chave: 5.01.00.00-9 Agronomia Cajanus cajan; Densidade; Adubação 5.01.03.00-8 Fitotecnia Cajanus cajan; Density; Fertilization.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3554

Sementes de guandu, produzidas em semeadura tardia: efeito de doses de fósforo, potássio e espaçamentos - DOI: 10.4025/actasciagron.v30i4.5318
Provedor de dados: 1
Autores: Bertolin, Danila Comelis; UNESP Ilha Solteira; Sá, Marco Eustáquio de; UNESP; Buzetti, Salatiér; UNESP; Colombo, Adriana de Souza; UNESP; Oliveira, Letícia Lisboa; UNESP; Rodrigues, Graciela Bassan; UNESP.
O presente trabalho teve por objetivo avaliar o efeito de cinco doses de P2O5 e quatro doses de K2O, em dois espaçamentos entre linhas, sobre a qualidade das sementes de guandu utilizando uma cultivar de ciclo curto, em Selvíria-Estado do Mato Grosso do Sul. Foram realizadas avaliações de velocidade de germinação, primeira contagem de germinação, germinação, envelhecimento acelerado e emergência de plantas em campo.  Para a determinação do efeito dos tratamentos, foi utilizado o delineamento inteiramente casualizado, em fatorial 2x5x4, com quatro repetições.  Os tratamentos foram: espaçamentos entre linhas de 30 e 50 cm, doses de P2O5 de 0, 40, 80, 120 e 160 kg há-1 e doses de K2O de 0, 30, 60 e 90 kg há-1. Não houve diferenças significativas entre...
Palavras-chave: 5.01.00.00-9    Agronomia Cajanus cajan L. Millsp.; Densidade; Germinação; Emergência de plantas. Cajanus cajan L. Millsp.; Density; Germination; Seedlings field emergence.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5318

Effects of stocking-density in flow-through system on the mussel Perna perna larval survival
Provedor de dados: 2
Autores: Turini, Caio Silva; Universidade Federal de Santa Catarina; Sühnel, Simone; Universidade Federal de Santa Catarina; Lagreze-Squella, Francisco José; Universidade Federal de Santa Catarina; Ferreira, Jaime Fernando; Universidade Federal de Santa Catarina; Melo, Claudio Manoel Rodrigues de; Universidade Federal de Santa Catarina.
This study evaluated the effects of larval densities, cultured in flow-through system, in the yield and quantity of larvae. The first experiment compared the larval yield of a flow­through system (80 larvae mL-1) and a batch system (8 larvae mL-1), which resulted in a higher yield and number of larvae in the flow­through system, after 23 days. The second experiment compared two larval densities (20 and 45 larvae mL-1) in flow­through system. The densities affected the yield after 15 and 23 days and the larvae final quantity after all tested times (8, 15, and 23 days). After 23 days of larviculture, the yield was highest for 20 larvae mL-1 and the larval number for 45 larvae mL-1. The third experiment also compared two larval densities (100 and 150 larvae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.06.03.00-0 bivalve mollusc; Yield; Larviculture; Density.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/23685

Características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias e estratégias de adubação nitrogenada - doi: 10.4025/actascianimsci.v33i4.10212
Provedor de dados: 2
Autores: Teixeira, Fábio Andrade; UESB; Bonomo, Paulo; UESB; Pires, Aureliano José Vieira; UESB; Silva, Fabiano Ferreira; UESB; Martins, Giselle Caroline Fernandes; UESB; Cardoso, Elisângela Oliveira; UESB.
O objetivo deste trabalho foi avaliar as características estruturais de pastos de Brachiaria decumbens diferidos por 140 dias, visando determinar a estratégia mais adequada de adubação nitrogenada. Foram estudadas quatro estratégias de adubação no início e no final do verão (0-0, 100-0, 50-50, 0-100 kg ha-1 de N), respectivamente, com quatro repetições. Para avaliação das densidades volumétricas, a forragem foi colhida em três estratos: estrato A- acima de 40 cm; B- 20-40 cm; e C- 0-20 cm do solo. O índice de tombamento foi menor (p &lt; 0,05) para a estratégia de adubação com 100 kg ha-1 de N aplicados no final do verão. No estrato B foram observadas maiores (p &lt; 0,05) densidades de forragem total, de lâmina foliar e de colmo verde para estratégia de...
Tipo: Pesquisa de campo
Palavras-chave: Forragicultura e pastagens acamamento; Densidade; Diferimento; Pastagem; Perfilho; Ureia falling; Density; Deferment; Grazing; Tiller; Urea.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10212

Tiller population density in deferred Urochroa decumbens pasture and strategies for nitrogen fertilization - doi: 10.4025/actascianimsci.v35i1.10243
Provedor de dados: 2
Autores: Teixeira, Fábio Andrade; Universidade Estadual do Sudoeste da Bahia; Bonomo, Paulo; Universidade Estadual do Sudoeste da Bahia; Pires, Aureliano José Vieira; Universidade Estadual do Sudoeste da Bahia; Silva, Fabiano Ferreira; Universidade Estadual do Sudoeste da Bahia; Abreu Filho, George; Universidade Estadual do Sudoeste da Bahia; Viana, Pablo Teixeira; Universidade Estadual do Sudoeste da Bahia.
The objective of this work was to evaluate the tiller population density in Urochroa decumbens pasture deferred for 95 and 140 days, aiming to determine the best strategy for nitrogen fertilization. Four fertilization strategies at the beginning and end of summer (0-0, 100-0, 50-50, 0-100 kg  ha-1 of N) were studied, respectively, with four repetitions. For the pastures deferred for 95 days, the population densities of vegetative tillers were greater (p &amp;lt; 0.05) for the strategy 0-100. At the end of the deferment period, the weight of the vegetative tillers per hectare was greater for the strategy 0-100, followed by the strategy 50-50. The densities of vegetative tillers, evaluated in the pastures deferred for 140 days, were greater (p &amp;lt; 0.05)...
Tipo: Pesquisa de campo
Palavras-chave: Density; Deferment; Grazing; Tiller; Urea.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10243

Structure of planktonic ciliates community (Protist, Ciliophora) from an urban lake of southern Brazil - doi: 10.4025/actascibiolsci.v35i4.18579
Provedor de dados: 3
Autores: Velho, Luiz Felipe Machado; Brão, Arianne Francielle Silva; Lansac-Tôha, Fernando Miranda; Buosi, Paulo Roberto Bressan; Meira, Bianca Ramos de; Cabral, Adalgisa Fernanda; Lansac-Tôha, Fábio Amodêo.
This study examined temporal and spatial (vertical) variations of composition, richness and abundance of the planktonic ciliates community in an urban and eutrophic lake, as well as identified the limnological factors involved in determining the patterns observed. To this end, samples of ciliates and measures of limnological variables were taken at different depths and hydrological periods. 35 ciliate species were identified, among which 14 species occurred in all periods and strata, being Prostomatida the most specious, followed by Gymnostomatida, Oligotrichida, Peritrichida, and Scuticociliatida. The patterns found for composition, abundance and species richness evidenced a vertical and temporal variation of these attributes. However, in general the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecologia - Limnologia / Ecologia de comunidades Protist; Density; Species compositio; Richness; Plankton Ecologia de Protoplâncton.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18579

The impact of oxygen consumption by the shrimp Litopenaeus vannamei according to body weight, temperature, salinity and stocking density on pond aeration: a simulation - doi: 10.4025/actascibiolsci.v33i2.7018
Provedor de dados: 3
Autores: Vinatea, Luis; UFSC; Muedas, Walter; UFMA; Arantes, Rafael; UFSC.
A simulation was conducted to determinate the impact caused by the combination of Litopenaeus vannamei respiratory rate (mg O2 shrimp-1 h-1), the behavior of SOTR (kg O2 h-1) of mechanical aerators as a function of salinity, as well as the oxygen consumption rate of the pond water and soil (mg O2 L-1 h-1) on the aeration of shrimp ponds (1, 10, 50 and 100 ha) stocked with different densities (10, 40 and 120 shrimp m-2), salinities (1, 13, 25 and 37 ppt), temperatures (20, 25 and 30°C), and shrimp wet weight (5, 10, 15 and 20 g). Results showed that under lower salinity, with larger shrimp, and higher stocking density, higher will be the quantity of required 2-HP aerators to keep dissolved oxygen over 50% saturation. In addition, under low salinity, with 5...
Palavras-chave: Aeration; Shrimp farming; Respiration; Oxygen consumption; Density Aeration; Shrimp farming; Respiration; Oxygen consumption; Density.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7018

Cannibalism among Myrmeleon brasiliensis larvae (Návas, 1914) (Neuroptera, Myrmeleontidae)
Provedor de dados: 3
Autores: Lima, Tatiane do Nascimento.
Cannibalism is influenced by various intrinsic and extrinsic factors of the population, such as density, population structure, prey availability, habitat structure and famine. These factors acting either independently or in synergy determine the frequency of cannibalism. The aims of the present study were to evaluate the effect of density and food availability on the occurrence of cannibalism among Myrmeleon brasiliensis larvae (Neuroptera, Myrmeleontidae). In the present study, the occurrence of cannibalism among M. brasiliensis larvae was greater in the treatments that simulated an absence of food in situations of both high and low density. The search for food makes a larva move about to forage, thereby increasing the risk of falling into the trap of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6 - 2.05.00.00-9 trap; Density; Antlion; Food availability Ecologia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/32822

Determination of some engineering properties, proximate composition and phytochemical properties of African star apple (chrysophyllum albidum)
Provedor de dados: 111
Autores: Isa, John.
African star apple (Chrysophyllum albidum) is a popular tree in tropical region with all the parts used for food and medicinal purposes. This study focused on the determination of some physical properties, mechanical properties, proximate composition, and phytochemical properties of the fruit. The experiment was conducted using standard procedures. Results for the physical properties of the fruits have values as follows: length per fruit 3.41 – 5.53 cm, width per fruit 3.31 – 5.08 cm, and thickness per fruit 2.93 – 4.73 cm, respectively. The density was found to be 1.073 gcm-3. The volume, angle of repose, geometric mean diameter, arithmetic mean diameter, sphericity was 47.55 cm3, 4.74 cm3, 4.13 cm3, 4.85 cm3 and 0.88 cm3 respectively. The seed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Volume; Angle of repose; Geometric mean diameter; Arithmetic mean diameter; Sphericity.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5797

The evaluation of two promising rainfed wheat cultivars as affected by different seeding rate in conventional and conservation tillage systems
Provedor de dados: 111
Autores: Khodadoost, Farshid; Pasari, Babak; Abdulahi, Abdolvahab; Rokhzadi, Asad; Mohammadi, Khosro.
This experiment was conducted to evaluate of two promising rainfed wheat cultivars as affected by different seeding rate in conventional and conservation tillage systems in the research field of the Dryland Agriculture Research Institute (DARI), Sararood branch, Kermanshah, Iran. The experiment layout designed as strip-split plot in a randomized complete block design with 3 replications during two consecutive growing seasons 2017-18 and 2018-19. The tillage systems were placed next to each other as a separate site at two levels: conventional tillage and conservation tillage (no tillage). Wheat cultivars were performed horizontally at two levels (Baran and Rijaw) and the seeding rate was carried out vertically with eight levels (75, 100, 125, 150, 175, 200,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultivar; Density; Protein; Soil organic carbon; Tillage.
Ano: 2022
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7383

THE EFFECT OF RIPENING PERIODS ON PHYSICAL, CHEMICAL AND MECHANICAL PROPERTIES OF SERVICE TREE FRUITS (Sorbus Domestica L.)
Provedor de dados: 111
Autores: Altuntaş, Ebubekír.
The effect of ripening periods on physical, chemical and mechanical properties of service tree fruits (Sorbus domestica L.) were determined. The geometric mean diameter, fruit mass, volume, surface area and fruit density of service tree fruits decreased with increase ripening periods, while, bulk density increased with ripening periods. L*, a*, b*, Chroma decreased with increase ripening periods, while hue angle increased with ripening periods respectively. The friction coefficients of service tree fruits with increase ripening periods were lower for laminate than the other surfaces. The total soluble solid content and total acidity of service tree fruits decreased at ripening period. Titratable acidity was higher in physiological maturity as compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ripening; Density; Color; Friction; Acidity.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3276

Drying behaviour and engineering properties of Lima beans
Provedor de dados: 111
Autores: MOHITE, ASHISH M; Sharma, Neha.
In this present research communication, selected engineering properties of lima beans and drying behaviour of beans using different dryers were studied. The results for geometric mean diameter and sphericity were found as 8.82 and 0.66. Bulk, tap and true densities were found as 568.1 kg/m3,625.8 kg/m3 and 769 kg/m 3 respectively. Arithmetic mean diameter, equivalent mean diameter and square mean diameter values were found to be 4.84 mm, 24.89 mm and 8.08 mm. Values for static coefficient of friction was highest on plywood surface followed by mild sheet and stainless steel. Ash content, crude fat and fiber content was found as 3.85%, 20.11% and 4.23 for lima beans. The drying behaviour of beans at three temperatures 40 oC,60 oC and 80oC at constant air...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seeds; Drying rate; Density.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4838

Physicochemical and thermal properties honey samples from Enugu North senatorial zone, Nigeria: Effects of floral locations
Provedor de dados: 111
Autores: Asoiro, Felix Uzochukwu; Simeon, Meshack Imologie; Azuka, Chinenye Eberechukwu.
The effects of floral location on the physicochemical and thermal parameters of honey samples from Enugu North senatorial zone were evaluated. Floral location had significant effects (P 0.05) on viscosity, electrical conductivity, sugar content, free acidity, ach content, moisture content, density, pH, colour, thermal heat conductivity and thermal heat diffusivity except, F/G ratio and specific heat capacity. Honeys from Igbo-Eze South were more viscose than the rest of the honey samples from other floral locations, with a mean viscosity value at 25 oC (15.58cSt) higher than that at 60 oC (12.63cSt). The electrical conductivity, ash content, moisture content and density  ranged between 226.5 - 211.45 µS cm-1, 0.06 -  0.57%, 16.59 – 22.55% and 0.82 – 1.25 g...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moisture content; Fructose; Free acidity; Density; Thermal heat diffusivity; Viscosity; Electrical conductivity.
Ano: 2022
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7343

Study of machine parameters in twin-screw extruder for pulses based extrudate
Provedor de dados: 111
Autores: Shukla, Prabhakar; Sudhakar, Anjali; Sharma, Anjali.
Legumes are prime source of plant proteins, calories and other nutrients. Extrusion cooking of legumes increases the digestibility of legume protein. Extrusion technology has been applied to generate analogues of foods made from animal products, as well as snacks using blends of various plant raw materials e.g. oil seeds [soybeans, peanut with a cereal flour]. Present work was under taken for producing extruded product from pigeon pea. The legumes viz. pigeon pea and Bengal gram were cleaned and ground to required particle size by multipurpose grinder mill to pass through sieve ASTM No. 20. The moisture content of sample was adjusted to 14% moisture level (w.b.). Before extrusion, the feed was allowed to come to ambient temperature and then remixed, after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Extrusion; Protein; Moisture content; Density; Dimension.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6861

Uptake and nitrogen efficiency in forage maize: effects of nitrogen and plant density
Provedor de dados: 115
Autores: Fallah,S.; Tadayyon,A.
Efficient nitrogen (N) fertilizer management is critical for the economic production of maize (Zea mays L.) and the long-term protection of environmental quality. To study the effects of N doses and plant density on the N uptake and efficiency on forage maize cv. SC 704, an experiment was conducted in the Shahrekord region (32° 21' N, 50° 49' E; altitude 2050 m), Iran, at the Agricultural Research Station of Shahrekord University, during the 2007 growing season. The experiment was arranged with four plant densities (92 600, 104 200, 119 000 and 138 900 plants ha-1) and four nitrogen doses (200, 240, 280 and 320 kg ha-1) in a randomized complete block design with four replications. Increases of the plant density led to a significant N uptake in stalk, grain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L.; Density; Efficiency; Fertilization; Uptake.
Ano: 2010
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952010000500005

Herpetofauna of an Atlantic rainforest area (Morro São João) in Rio de Janeiro State, Brazil
Provedor de dados: 42
Autores: Almeida-Gomes,Mauricio; Vrcibradic,Davor; Siqueira,Carla C.; Kiefer,Mara C.; Klaion,Thaís; Almeida-Santos,Patrícia; Nascimento,Denise; Ariani,Cristina V.; Borges-Junior,Vitor N.T.; Freitas-Filho,Ricardo F.; van Sluys,Monique; Rocha,Carlos F.D.
We studied the herpetofaunal community from the Atlantic forest of Morro São João, in Rio de Janeiro State, Brazil, and present data on species composition, richness, relative abundance and densities. We combined three sampling methods: plot sampling, visual encounter surveys and pit-fall traps. We recorded sixteen species of amphibians and nine of reptiles. The estimated densities (based on results of plot sampling) were 4.5 ind/100 m2 for amphibians and 0.8 ind/100 m² for lizards, and the overall density (amphibians and lizards) was 5.3 ind/100 m². For amphibians, Eleutherodactylus and Scinax were the most speciose genera with three species each, and Eleutherodactylus binotatus was the most abundant species (mean density of 3.0 frogs/100 m²). The reptile...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herpetofauna; Atlantic rainforest; Brazil; Richness; Density.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200007

Use of intertidal areas by shrimps (Decapoda) in a brazilian Amazon estuary
Provedor de dados: 42
Autores: SAMPAIO,HEBERT A.; MARTINELLI-LEMOS,JUSSARA M.
The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops) in an Amazon estuary. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature) and measured the area (m2) and volume (m3) of every pool through bathymetry. The average pH, salinity, temperature, area and volume of tide pools were 8.75 (± 0.8 standard deviation), 35.45 (± 3), 29.49 °C (± 2.32), 27.41 m2 (± 41.18), and 5.19 m3(± 8.01), respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Habitat; Density; Biomass; Decapoda.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100333

Parameters from the community of leaf-litter frogs from Estação Ecológica Estadual Paraíso, Guapimirim, Rio de Janeiro State, southeastern Brazil
Provedor de dados: 42
Autores: Rocha,Carlos F.D.; Vrcibradic,Davor; Kiefer,Mara C.; Siqueira,Carla C.; Almeida-Gomes,Mauricio; Borges Júnior,Vitor N.T.; Hatano,Fábio H.; Fontes,Angélica F.; Pontes,Jorge A.L.; Klaion,Thais; Gil,Lívia O.; Sluys,Monique Van.
We studied the leaf-litter frog community of Estação Ecológica Estadual Paraíso, in Guapimirim, Rio de Janeiro State, southeastern Brazil. Herein we combined three sampling methods (large plots, visual encounter surveys and pit-fall traps) to present data on species composition, richness, relative abundance and densities. The local assemblage of frogs associated to the leaf-litter was composed by 14 species, belonging to nine families. Haddadus binotatus, a direct-developing frog, was the most abundant species in the community. The estimated density of the local leaf-litter frog assemblage based on plot sampling was 4.3 frogs/100 m². Haddadus binotatus had the highest density (1.1 ind/100 m²). Frogs were predominantly found at night. Thoropa miliaris had...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Atlantic Forest; Brazil; Community parameters; Density; Leaf-litter.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400013

Density of ocelots in a semiarid environment in northeastern Brazil
Provedor de dados: 49
Autores: Penido,Gabriel; Astete,Samuel; Furtado,Mariana Malzoni; Jácomo,Anah Tereza de Almeida; Sollmann,Rahel; Torres,Natalia; Silveira,Leandro; Marinho Filho,Jader.
Abstract Ocelots play a key role in ecological communities as mesopredators affecting the lower trophic level and other mesopredators. They show great variability in ecological traits across their distribution, but knowledge of this species is missing in several regions where it occurs. Here, we present the first study of ocelot in the Brazilian semiarid of Caatinga. Arid habitats might keep carnivore population density low and therefore vulnerable to environmental shocks and to human-induced changes, at risk of local extinction. To assess their population status, we used camera traps between September 2009 and January 2010. We estimated the density of ocelots using a spatially explicit capture-recapture method (SECR) to be 3.16 ± 0.46 individuals per 100...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Arid environments; Brazil; Density; Ocelot; SECR.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400503

Effects of plant cover on the macrofauna of Spartina marshes in northern Brazil
Provedor de dados: 52
Autores: Braga,Cesar França; Beasley,Colin Robert; Isaac,Victoria Judith.
Data on macrofauna density and diversity, and the height and density of Spartina brasiliensis, were obtained from salt marsh beds of a tropical estuary in northern Brazil. Sampling was carried out at four distinct times of the year, during the wet and dry seasons and in the transition periods between these. Sampling was also carried out in salt marshes of three size classes, small, medium and large. Variables were analyzed in relation to time of year and salt marsh size class. Overall, 46 taxa were found, with polychaetes, isopods and the gastropod Neritina virginea dominating the fauna. Macrofauna density and diversity were positively correlated with culm density, indicating a possible role in protection from predation. All the three variables were higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrofauna; Spartina; Density; Diversity; Seasonality; Tropical estuary.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600013

Diel Variations and Ecological Aspects in Fish Assemblages of a Sandy Beach in the Semi-Arid Region of Northeast Brazil.
Provedor de dados: 52
Autores: Dantas,Natália Carla Fernandes Medeiros; Silva Júnior,Carlos Antônio Beserra; Lippi,Daniel Lino; Feitosa,Caroline Vieira.
ABSTRACT For the demersal fish that inhabit sandy beaches, the variation between day and night periods represents a determinant factor in their behavior, especially for species that live in shallow waters. This research aims at determining whether there are differences in the fish assemblage structure of the sandy beach of São Cristóvão, RN, Brazil, between diurnal and nocturnal periods. Samplings were carried out in 2011, during spring high tide period, with an otter trawl net. Dissimilarity between diurnal and nocturnal fish assemblages was confirmed by PERMANOVA results. No statistical differences were observed for richness and diversity of fish assemblage between day and night periods. The first and third order carnivores were the significantly more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Demersal ichthyofauna; Density; Diversity; Total length; Day; Night.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100347

Densidad y diversidad del zooplancton en los ríos Salado y Negro --Planicie del Río Paraná -- Argentina
Provedor de dados: 57
Autores: MARGARITA FRUTOS,SANTA.
Zooplankton abundance and diversity of Salado and Negro rivers were compared in relation to the water level fluctuations. The zooplankton pumper samples were collected between March, 1993 and October, 1994. Mean zooplankton density at Salado river was very higher in upstreem. Zooplankton density in the Negro and Salado rivers were variable in the high water phase. Changes in the density appeared to be related to the hydrologic phases, seasonal cycle and conductivity variation. The zooplankton abundance was positively correlated with the abiotic and biotic factors (temperature, transparency and fitoplankton). The dominant group in the two studied rivers were the rotifers. The dominant species in the high water phase were limnoplanktonic and scarce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: The rivers; Zooplankton; Density; Diversity and similarity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300008

Variation of density, species composition and dominance of Rotifers at a shallow tropical reservoir (Broa reservoir, SP, Brazil) in a short scale time
Provedor de dados: 57
Autores: RODRÍGUEZ,M. P.; MATSUMURA-TUNDISI,T.
Rotifers are the predominant group of zooplankton found in the majority of reservoirs, constituting more than 60% of the total zooplankton present. Being opportunistic organisms, they easily adapt to changes in environmental conditions, and it is therefore difficult to establish a constant level of composition and occurrence of a species in specific areas at specific times. In order to establish how changes in composition and predominance of a species occurs within a dynamic system, the daily variation in the total density of rotifers and that of the dominant species were studied at short intervals during a period of 20 days at Lobo (Broa) reservoir. Filinia pejleri and Keratella americana were the predominant species, making up 64.3% of the total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Composition; Dominance; Rotifers; Reservoir.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100002

Dry matter production and partitioning of maize hybrids and dwarf unes at four plant populations
Provedor de dados: 65
Autores: Sangoi,Luis; Salvador,Ricardo.
This experiment was conducted in Ames, Iowa, USA, to compare dry matter accumulation patterns of maize genotypes contrasting in height and leafiness, and to test whether reduction in plant height an leaf number through the use of dwarfing genes or earliness can improve grain dry matter allocation. Five plant genotypes were tested: a full season hybrid adapted to central lowa (NK 4525), a short season hybrid adapted to northern Minnesota (C1070), and three dwarf lines (156-A, 302-E and I17- A). The dwarves contained, respectively, the homozygous, independent, recessive dwarfing genes d3, d1 and br2. Each genotype was sown at four plant populations: 25, 50, 75 and 100.000 plants. ha-1. Hybrids had the greatest rates of decrease in total biomass and grain dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Plant height; Density; Harvest index.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781997000100001

Growth ring analysis of Euxylophora paraensis through x-ray microdensitometry
Provedor de dados: 65
Autores: Andrade,Eva Santos de; Garcia,Silvana dos Santos Carvalho; Albernaz,Ana Luisa Kerti Mangabeira; Tomazello Fillho,Mario; Moutinho,Victor Hugo Pereira.
ABSTRACT: Euxylophora paraensis Huber - Rutaceae, popularly known as yellow heart, is a species with a low-density population that has suffered intense exploitation in recent decades. This has led to its inclusion in the IBAMA list of endangered species. This study aimed to evaluate the existence of growth rings and their annuity in five trees of Euxylophora paraensis through the x-ray microdensitometry technique, as well as to compare them using the classical method. Application feasibility of this technique can be deepened through future, broader dendroecological studies, which may better elucidate the understanding of the species population dynamics and promote more sustainable uses. Wood disks were collected from the base of five 29-year-old trees from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendrochronology; Yellow heart; Density; Amazon.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400501

Effects of one haustorium-inducing quinone DMBQ on growth and development of root hemiparasitic plant Monochasma savatieri
Provedor de dados: 65
Autores: Chen,Lanlan; Zhu,Zaibiao; Guo,Qiaosheng; Guo,Jun; Huang,Zhigang; Shi,Yongtao; Wen,Zhencui.
ABSTRACT: Monochasma savatieri Franch. ex Maxim is a perennial, parasitic herb used in traditional Chinese medicine and its wild resources have decreased sharply in recent years due to destructively harvesting and habitat destruction. Haustorium formation is a key event of parasites, but the concentrations of haustorium-inducing factors vary with species and cultivation conditions. In this study, we investigated the effects of the 2,6-dimethoxy-p-benzoquinone (DMBQ) concentration and cultivation density on the growth traits, haustorium formation and biomass of M. savatieri in the absence of a host plant. The results showed that both the DMBQ concentration and cultivation density regulated growth traits, haustorium formation and biomass in M. savatieri. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Artificial cultivation; Density; DMBQ; Fuzzy membership function; Growth promotion.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000300202

BULLFROG HEMOGRAM UNDER MANAGEMENT STRESS
Provedor de dados: 64
Autores: Teixeira,Patrícia Coelho; Vicentini,Irene Bastos Franceschini; Ferreira,Claudia Maris; França,Fernanda Menezes; Bordon,Isabela Cristina Antunes da Costa; Ranzani-Paiva,Maria José Tavares.
Stress is one of the major obstacles in frog culture and can be caused by factors such as inappropriate farming systems; inadequate management among other situations. The objective of the present study was to assess the hemogram, erythrogram and leukogram of bullfrogs (L. catesbeianus) when exposed to stress caused by different types of management: density and handling (manipulation), developed in the laboratory and repeated in the field for the appropriate comparisons in a experimental period of 30 days. The density experiment was conducted with four treatments: 70 animals m-2 (D70); 100 animals m-2 (D100), Control; 150 animals m-2 (D150) and 200 animals m-2 (D200), with 10, 14, 21 and 28 animals/box in the laboratory, respectively. Each treatment was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: L. catesbeianus; Density; Handling; Physiological response; Hematology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200154