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A new statistic for sampling design investigation : an application to length-structured landings sampling ArchiMer
Vigneau, Joel; Mahevas, Stephanie.
Measuring fish on a market or on board a vessel is the most common action taken by biologists all around the world to gather data for stock assessment. The samples coming from this kind of survey are of vector type and are not straightforward to analyse and compare. This paper proposes a generic tool that enables to investigate in any multinomial like sampling scheme. The use of this tool will be discussed based on examples from two different sampling designs. One is a sampling of commercial market categories and the other is a métier based sampling. The research of outliers, misallocated samples or potential bias, the stratification and the analysis of within and between strata variance will be discussed with the objective of constructing the best...
Tipo: Text Palavras-chave: Stratification; Sampling design; Length structure; Market sampling.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/acte-2698.pdf
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Capacidad germinativa de semillas de Taxus globosa Schltdl. Colegio de Postgraduados
Ramírez Sánchez, Susana Elizabeth.
Taxus globosa Schtdlt. es una especie de importancia no solo por encontrarse en la NOM-059-ECOL-2010, sino, también por que produce un metabolito llamado taxol que es utilizado comercialmente para contrarrestar el cáncer. Actualmente, su obtención de esta especie es complicada, pues por encontrarse dentro de la norma, está prohibida su extracción; además su distribución en México es discontinua y su semilla presenta latencia, condición que dificulta mucho la propagación por medio de semilla; la germinación es escalonada y baja (2 al 14%). Es la única especie de este género en México y se considera endémica de nuestro país y de América central. Por lo que, en la presente investigación se buscó evaluar las diferencias morfológicas en las semillas de dos...
Palavras-chave: Taxus globosa; Germinación; Tratamientos pre-germinativos; Incubación; Estratificación; Germination; Pre-germination treatments; Incubation; Stratification; Producción de Semillas; Doctorado.
Ano: 2012 URL: http://hdl.handle.net/10521/1089
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Coccolith-derived turbidity and hydrological conditions in May in the Bay of Biscay ArchiMer
Perrot, Laurie; Gohin, Francis; Ruiz-pino, Diana; Lampert, Luis; Huret, Martin; Dessier, Aurelie; Malestroit, Pascale; Dupuy, Christine; Bourriau, Paul.
Coccolithophore blooms occur regularly from April to June in the Bay of Biscay where they have been observed for many years from ocean-colour imagery thanks to the ability of their calcite plates to scatter light. They are easily depicted on interpolated images of non-algal Suspended Particulate Matter (SPM) derived from satellite reflectance data in May, at the time of the PELGAS (PELagique GAScogne) annual surveys. Over the springs 2012 to 2015, the PELGAS surveys provided in-situ data on the turbidity throughout the water column and on the hydrological environment prevailing during the blooms in the vicinity of the continental shelf break. The satellite-derived SPM in the area of coccolithophore blooms was closely related to measured turbidity in the...
Tipo: Text Palavras-chave: Bay of Biscay; Ocean colour; Suspended particulate matter; Turbidity; Coccoliths; Stratification.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00416/52790/53689.pdf
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Coherent heat patterns revealed by unsupervised classification of Argo temperature profiles in the North Atlantic Ocean ArchiMer
Maze, Guillaume; Mercier, Herle; Fablet, Ronan; Tandeo, Pierre; Radcenco, Manuel Lopez; Lenca, Philippe; Feucher, Charlene; Le Goff, Clement.
A quantitative understanding of the integrated ocean heat content depends on our ability to determine how heat is distributed in the ocean and what are the associated coherent patterns. This study demonstrates how this can be achieved using unsupervised classification of Argo temperature profiles. The classification method used is a Gaussian Mixture Model (GMM) that decomposes the Probability Density Function of a dataset into a weighted sum of Gaussian modes. It is determined that the North Atlantic Argo dataset of temperature profiles con- tains 8 groups of vertically coherent heat patterns, or classes. Each of the temperature profile classes reveals unique and physically coherent heat distributions along the vertical axis. A key result of this study is...
Tipo: Text Palavras-chave: Heat content; Classification North Atlantic; Stratification; Water mass; Thermocline; Argo; Pattern.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00363/47431/47456.pdf
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Competitiveness levels in cattle herd farms Ciência Rural
Marques,Pedro Rocha; Barcellos,Júlio Otávio Jardim; Dill,Matheus Dhein; Dias,Eduardo Antunes; Azevedo,Eduardo Vaz Torres; Lampert,Vinícius do Nascimento; McManus,Concepta Margaret.
The aim of this experiment was to identify improvement demands for farms with different levels of competitiveness in the west of Rio Grande do Sul state, Brazil. A total of 63 owners of large farms were interviewed (farms with an area greater than 900ha) by applying a semi-structured questionnaire, guided by four drivers: technology (TEC), management (MAN), market relations (MR) and the institutional environment (IE).It was used the Statistical Analysis System 9.2 software to perform the cluster analysis and identify farmers' characteristics. Three random clusters with different levels of competitiveness were observed: low competitiveness level (LCL), middle competitiveness level (MCL) and high competitiveness level (HCL). The 29 variables (sub factors)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cluster; Level of impact; Management; Ranking; Stratification.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000300480
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Detecting sampling outliers and sampling heterogeneity when catch-at-length is estimated using the ratio estimator ArchiMer
Vigneau, Joel; Mahevas, Stephanie.
Measuring fish on board fishing vessels or at fish markets to collect data for stock assessment purposes is one of the most straightforward actions carried out by fisheries scientists worldwide. However, such samples are not straightforward to handle and analyse because of their vector-type structure. A generic tool that allows investigation in any multinomial-like sampling scheme is provided, as long as the scheme is built on a ratio estimator, which is the case for most length sampling in the fisheries sector. The use of this tool is discussed using data obtained from two different sampling designs, one consisting of commercial market samples by category and the other on fishing activity or metier. The identification of outliers, misallocated samples, or...
Tipo: Text Palavras-chave: Stratification; Sampling design; Market sampling; Length structure.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2731.pdf
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Diferenciação social e acesso a treinamento em organização de pesquisa. Repositório Alice
LIMA, S. M. V.; GUIMARAES, T. de A.; BORGES-ANDRADE, J. E.; COSTA, F. B. L..
O objetivo do presente trabalho e o de investigar a relação entre diferenciação social e o treinamento de curta-duração, numa amostra aleatória de 1.104 empregados da EMBRAPA. As variáveis dependentes foram participação em treinamento e quantidade destas participações. através de teste tri-quadrado e de analises de regressão múltipla, relacionou-se estas variáveis a 40 variáveis independentes estraficatórias, classificadas em quatro grupos: características individuais, ocupacionais, organizacionais e regionais. Salário médio e posição de supervisão são estratificadores de treinamento somente nas unidades de pesquisa, Aparecem exclusivamente nas unidades de apoio a pesquisa, por outro lado, a idade dos empregados e o total de cursos que suas unidades...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Acesso; Treinamento; Participacao; Organizacao; Pesquisa; Diferenciacao social; Estratificacao; Ocupacional; Access; Training; Participation; Organization; Research; Social differentiation; Stratification; Occupational.
Ano: 1988 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89041
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Dormancy overcome and seedling quality of pecan in nursery Ciência Rural
Poletto,Tales; Muniz,Marlove Fátima Brião; Poletto,Igor; Stefenon,Valdir Marcos; Maciel,Caciara Gonzatto; Rabusque,Jéssica Emilia.
ABSTRACT: This study evaluated the efficiency of methods to overcome seed dormancy in different storage periods in the production of pecan seedlings. Seeds were submitted to the following treatments: T1, T4 and T7 - control treatments (seeds with no treatment, stored at room temperature for 30, 60 and 90 days, respectively), T2, T5 and T8 - stratification (seeds were distributed in boxes with wet sand maintained at a temperature of 4°C for 30, 60 and 90 days, respectively), T3, T6 and T9 - scarification + stratification (seeds scarified with sandpaper n.80 and stratified by 30, 60 and 90 days, respectively), in completely random experimental design. Plant height, stem diameter, number of leaves, full emergence and emergence speed index (ESI) were evaluated...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scarification; Stratification; Emergence; Carya illinoinensis.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001101980
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Efeitos da fragmentação florestal sobre vespas e abelhas solitárias na Amazônia Central. II. estratificação vertical Zoologia
Morato,Elder Ferreira.
The effects of forest fragmentation on the patterns of vertical abundance and richness of solitary wasp and bee communities was investigated near Manaus, Amazonas. Wasps and bees were trap-nested at 1,5, 8 and 15 m above the ground in continuous primary forestand isolated forest fragments. In general, the number of nests and species increased with height for both groups. In particular, bee species richness at 15 m was almost twice that at 1,5 mm. However, one species of Trypoxylon Latreille, 1796 (Sphecidae) consistently nested in the understorey. Thus, patterns of abundance and richness distributions indicated stratification. A contingency analysis showed that fragmentation altered stratification of nesting activity of the wasp community in fragments....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest fragmentation; Amazonia; Stratification; Solitary wasps; Solitary bees.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000300010
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Effects of erosion and deposition on particle size distribution of deposited farmland soils on the chinese loess plateau Rev. Bras. Ciênc. Solo
Zhao,Pei; Shao,Ming An; Omran,Wail; Amer,Abdel-monem Mohamed.
Particle size distribution (PSD) in the soil profile is strongly related to erosion, deposition, and physical and chemical processes. Water cycling and plant growth are also affected by PSD. Material sedimented upstream of the dam constructions formed large areas of deposited farmland (DF) soils on the Chinese Loess Plateau (CLP), which has been the site of the most severe soil erosion in the world. Two DFs without tillage on the CLP were chosen to study the combined effect of erosion and check dams on PSD. Eighty-eight layers (each 10 cm thick) of filled deposited farmland (FDF) soils and 22 layers of silting deposited farmland (SDF) soils of each studied soil profile were collected and 932 soil samples were investigated using laser granulometry. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil texture; Stratification; Soil erodibility; Dam construction; Soil conservation.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600028
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Estrutura e diversidade do componente arbóreo da floresta na Estação Ecológica dos Caetetus, Gália, SP Rev. Bras. Bot.
DURIGAN,GISELDA; FRANCO,GERALDO ANTÔNIO DAHER CORRÊA; SAITO,MASAHIRO; BAITELLO,JOÃO BATISTA.
O estudo fitossociológico, se realizado em diferentes estratos verticais da floresta, fornece dados de grande valia para a compreensão da dinâmica da comunidade. Efetuou-se levantamento das espécies arbóreas presentes em diferentes estratos, em área de 6.000 m² de floresta madura, na Estação Ecológica dos Caetetus, Gália, SP. Foram utilizadas 60 parcelas de 10 x 10 m, para indivíduos com diâmetro do caule a 1,30 m acima do nível do solo (DAP) a partir de 5 cm (estrato superior); 10 x 2 m, para indivíduos com DAP entre 1 e 5 cm (estrato intermediário) e 60 sub-parcelas de 2 x 2 m, para indivíduos menores que 1 cm de DAP (estrato inferior). Verificou-se que a diversidade, a composição florística e a densidade relativa das espécies variam entre estratos. No...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seasonal semideciduous forest; Phytosociology; Stratification.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000400003
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Germinacao de sementes de capicova. Repositório Alice
ZAYAT, A.G.; RANAL, M.A..
A capicova, ErechTites valerianaefolia DC. (asteraceae), e uma especie nativa do Brasil, potencialmente comerciavel como hortalica devido ao seu alto teor de vitamina A. As sementes, com o objetivo de avaliar o padrao de germinacao em condicoes de laboratorio, foram submetidas a 22 tratamentos, com cinco repeticoes de 50 sementes cada uma, incluindo estratificacao, escarificacao, utilizacao de agar e papel de filtro como substratos, aplicacao de KNO3 e hipoclorito de sodio, utilizacao de lotes com diferentes idades, tratamentos sob luz continua e no escuro, bem como combinacoes desses tratamentos. As sementes de capicova sao fotoblasticas positivas e apresentam maior germinabilidade quando coletadas no inverno (abril a setembro). O tipo de substrato...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Germinabilidade; Luz; Estratificacao; Escarificacao; Hipoclorito de sodio; Nitrato de potassio; Substrato; Erechtites valerianefolia; Hortalica; Vitamina A; Germinability; Light; Stratification; Scarification; Sodium hypochlorite; Potassium nitrate; Vegetable; Vitamin A.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/91100
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Hydrodynamics and SPM transport in a man-engineered tidal estuary: The Adour river (France) ArchiMer
Defontaine, Sophie; Sous, Damien; Morichon, Denis; Verney, Romaric; Monperrus, Mathilde.
The present paper reports on a series of field experiments aiming to characterise the functioning of a man-engineered strongly forced salt-wedge estuary: the lower estuary of the Adour river, France. Bottom-moored velocity measurements and surface boat surveys have been performed under low river discharge conditions, for both neap and spring tides, in order to provide a well-documented reference framework to understand the dynamics of water masses, turbulence and suspended particulate matter (SPM) transport in the lower estuary. An additional campaign has been carried out in high river discharge conditions. This first documented in-situ study of the Adour lower estuary demonstrates its variability in terms of hydrological regimes, from salt-wedge to...
Tipo: Text Palavras-chave: Salt-wedge estuary; Estuarine circulation; Stratification; Turbulence; Suspended particles transport; Adour river.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00588/70049/67987.pdf
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Identificacao de fungo lignocelulitico em sementes de erva-mate (Ilex paraguariensis St. Hil.). Repositório Alice
MEDEIROS, A. C. de S.; AMAZONAS, A. L. de A.; GRIGOLETTI JUNIOR, A.; URBEN, A. F..
1997
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Erva-mate; Ilex paraguariensis; Stratificacao; Chaetomium globosum; Fungo; Semente; Fungi; Seeds; Lignocellulose; Stratification.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/300075
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Impact du régime du barrage d'Arzal sur la stratification a l'embouchure de la Vilaine : étude par modélisation numérique ArchiMer
Le Hir, Pierre; Duchene, C.; Merel, A; De Nadaillac, G.; Merceron, Michel; Breton, Marguerite.
The rate of flow of the fresh water releases at the Arzal Dam into the Vilaine is likely to influence the haline structure of Vilaine Bay. In order to determine the rate of flow that causes a minimum downstream stratification, a vertical two-dimensional mathematical modelling of the Vilaine's estuary was undertaken. We obtain very similar stratification flows for different fresh water release scenarios, in spite of the rather different desalinisations and currents.
Tipo: Text Palavras-chave: Water release; Stratification; Estuary; Numerical model; Vilaine; Rejet de barrage; Stratification; Estuaire; Modèle numérique; Vilaine.
Ano: 1986 URL: https://archimer.ifremer.fr/doc/1986/rapport-2654.pdf
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Impact of artificial destratification on water availability of reservoirs in the Brazilian semiarid Anais da ABC (AABC)
LIMA NETO,IRAN E..
Abstract: Field surveys and integral modelling were carried out to study the effect of bubble plumes on the flow hydrodynamics and the time-evolution of water temperature profiles in a shallow lake with maximum depth of about 4 m. Then, model simulations were performed to verify the feasibility of destratification of ten water-supply reservoirs with capacities of 10-2,000 hm3. Finally, hydrological modelling was conducted to assess the impact of destratification on evaporation suppression and its effects on reservoir yield. The results indicate that net temperature reductions of the order of 1.0°C can be obtained, which corresponds to evaporation suppressions of approximately 10%. In turn, this resulted in increases in the regulated flow of 2-12% that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aeration; Evaporation; Bubble plumes; Lakes; Stratification; Water yield.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500904
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Influence of morphological changes on suspended sediment dynamics in a macrotidal estuary: diachronic analysis in the Seine Estuary (France) from 1960 to 2010 ArchiMer
Grasso, Florent; Le Hir, Pierre.
Estuaries are subject to extensive morphological changes through human activities, such as deepening and narrowing via dredging and channelization. The estuary sediment load, characterised by the estuarine turbidity maximum (ETM), can severely increase in response to channel deepening, shifting the estuary from a natural to hyperturbid state. The main processes driving the estuarine circulation, hydrology and sediment dynamics are relatively well known. However, their relative influence on suspended sediment concentration (SSC), as well as their role in the transition toward hyperturbid estuaries, is still a subject of debate. Therefore, this study aims at investigating the relative contribution of key estuarine drivers (gravitational circulation and tidal...
Tipo: Text Palavras-chave: Estuary deepening and narrowing; Sediment dynamics; Turbidity maximum; Tidal asymmetry; Stratification; Numerical modelling; Morphological changes.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00479/59046/65965.pdf
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Masas de agua en la plataforma continental OceanDocs
Guerrero, R.A.; Piola, A.R..
The current knowledge on the argentine continental shelf water masses is summarized in this paper. These water masses are characterized as a function of water types fed by the boundary currents and the modifications due to continental runoff, and water energy exchange with the atmosphere. Based on sea surface salinity distributions and the temperature-salinity characteristics, three masses are described: coastal waters, mid-shelf waters and slope waters. The main freshwater sources found along the coast are identified, as well as high salinity formation areas. The vertical stratification, mainly controlled by temperature, is analyzed along the annual cycle. The stratification cycle is mainly driven by the heat exchange between the atmosphere and the ocean....
Tipo: Book Section Palavras-chave: Continental shelves; Water masses; Hydrography; Water circulation; Oceanic fronts; Stratification; Water circulation; Stratification; Hydrography; Continental shelves; Http://aims.fao.org/aos/agrovoc/c_8314; Http://aims.fao.org/aos/agrovoc/c_7438; Http://aims.fao.org/aos/agrovoc/c_3727; Http://aims.fao.org/aos/agrovoc/c_32413.
Ano: 1997 URL: http://hdl.handle.net/1834/1703
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Mortalites de poissons en baie de Vilaine (Juillet 1982) Causes - Mécanismes - Propositions d'action ArchiMer
Merceron, Michel.
The massive number of fish mortalities that occurred in July of 1982 in Vilaine Bay is due to a very pronounced oxygen depletion in the bay's bottom waters. This loss was caused by the chronic fragility of this area, associated with an abnormal weather pattern. The endemism of partial oxygen depletion has been brought to light. The latter could be economically more significant than the anoxia of 1982. Preventative and warning actions have been proposed.
Tipo: Text Palavras-chave: Brittany; Dam; Estuary; Meteorological factors; Stratification; Phytoplankton; Oxygen depletion; Coastal waters; Fish kill; Estuaire; Facteurs météorologiques; Stratification; Prolifération planctonique; Déficit en oxygène; Eaux côtières; Mortalité de poisson.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/rapport-2836.pdf
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Observations on the Lateral Structure of Wind-Driven Flows in a Stratified, Semiarid Bay of the Gulf of California ArchiMer
Winant, Chloe; Valle-levinson, Arnoldo; Ponte, Aurelien; Winant, Clinton; Gutierrez-de-velasco, Guillermo; Winters, Kraig.
Time series of current velocity profiles and thermistor chains were obtained throughout a cross-bay transect for ~90 days for the purpose of comparing observed wind-driven stratified flows to theory. This study concentrates on the synoptic scale wind and its influence on the bay’s circulation. The maximum water column stratification was 3–4 °C/m throughout the deployment and influenced wind-driven flows. Low-pass filtered flows showed more complicated structures than those expected from theory: a depth-dependent recirculating structure with the along-bay flow over one half of the transect moving in opposite direction to the other half. Analysis of complex empirical orthogonal functions indicated that the first six modes explained 80 % of the flow...
Tipo: Text Palavras-chave: Wind-driven flow; Stratification; Concepcion Bay; Semiarid.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00171/28218/32176.pdf
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