Consulta: subjectFacets:"Variability"
Registros recuperados: 122
Data/hora: 10/06/2024 12:20:56

Caracterización fenotípica y molecular de variedades de caña de azúcar cultivadas en el estado de Tabasco
Provedor de dados: 32
Autores: González Jiménez, Vianey.
Se llevó a cabo una caracterización morfológica de 12 variedades de caña de azúcar del estado de Tabasco mediante descriptores morfológicos, se identificó la filogenia por medio de secuenciamiento de la región ITS de DNA ribosómico y trnL-F cloroplástico, y se hizo una caracterización molecular usando la técnica AFLP. La descripción fenotípica se llevó a cabo considerando las características de entrenudo, hoja y yema. En la amplificación del DNA ribosómico se utilizaron los iniciadores ITS4 e ITS5. Para la amplificación del cloroplasto se utilizaron los iniciadores universales trnL-F. El procedimiento para la realización de los AFLPs se realizó siguiendo las recomendaciones descritas en el Kit AFLP®Analysis System I y AFLP® Starter Primer Kit. Entre las 12...
Tipo: Tesis
Palavras-chave: Caña de azúcar; AFLPs; DNA; Variabilidad; Maestría; Producción Agroaliemtaria en el Trópico; Sugarcane; Variability.
Ano: 2009
URL: http://hdl.handle.net/10521/1558

Morfología de frutos, perfil de ácidos grasos en semilla y diversidad genética molecular en selecciones de zapote mamey (Pouteria sapota (Jacq.) H. E. Moore &amp; Stearn).
Provedor de dados: 32
Autores: Ibarra Estrada, Martha Elva.
A México se le considera   centro de origen del zapote mamey ya que cuenta con una gran diversidad. Sin embargo, son pocos   los trabajos enfocados en estudiar tal diversidad tanto en la parte morfológica, contenido de ácidos graso o aspectos moleculares. Por lo anterior, el objetivo   del presente trabajo fue: caracterizar morfológica, bioquímica y molecularmente selecciones sobresalientes de zapote mamey. En base a las variables de fruto y el perfil de ácidos grasos en semilla, el material vegetal estudiado mostró amplia variación entre las accesiones. El peso y longitud de fruto, longitud de hilio y de semilla, número de fibras, grosor de epicarpio y ancho de semilla fueron las variables determinantes para la agrupación de las selecciones. El perfil de...
Palavras-chave: Caracterización; Frutos; Variabilidad; RAPD; RAMP; Characterization; Fruits; Lipids; Seeds; Variability; Lípidos; Semillas; Doctorado; Fruticultura.
Ano: 2012
URL: http://hdl.handle.net/10521/740

Restoring Riparian Ecosystems: The Challenge of Accommodating Variability and Designing Restoration Trajectories
Provedor de dados: 7
Autores: Hughes, Francine M. R; Anglia Polytechnic University; f.hughes@apu.ac.uk; Colston, Adrian; Wicken Fen National Nature Reserve; adrian.colston@nationaltrust.org.uk; Mountford, J. Owen; NERC Centre for Ecology and Hydrology; om@ceh.ac.uk.
Flood disturbance processes play a key role in the functioning of riparian ecosystems and in the maintenance of biodiversity along river corridors. As a result, riparian ecosystems can be described as mobile habitat mosaics characterized by variability and unpredictability. Any river restoration initiative should aim to mimic these attributes. This paper suggests that there needs to be an increased institutional capacity to accept some levels of both variability and unpredictability in the ecological outcomes of river restoration projects. Restoration projects have frequently used some form of historical or contemporary reference system to define objectives and to help in the evaluation process. Using these reference systems can give a false sense of the...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: River restoration; Predictability; Variability; Restoration trajectories; Reference systems; Wicken Fen; Floodplain forests; Restoration objectives; Restoration evaluation.
Ano: 2005

Irrigation experiments in the lab: trust, environmental variability, and collective action
Provedor de dados: 7
Autores: Baggio, Jacopo A.; Center for Behavior, Institutions and the Environment, Arizona State University; Department of Environment and Society, Utah State University; jbaggio@asu.edu; Rollins, Nathan D.; Center for Behavior, Institutions and the Environment, School of Human Evolution and Social Change, Arizona State University; nathan.rollins@asu.edu; Janssen, Marco A.; Center for Behavior, Institutions and the Environment, School of Sustainability, Arizona State University; Marco.Janssen@asu.edu.
Research on collective action and common-pool resources is extensive. However, little work has concentrated on the effect of variability in resource availability and collective action, especially in the context of asymmetric access to resources. Earlier works have demonstrated that environmental variability often leads to a reduction of collective action in the governance of shared resources. Here we assess how environmental variability may impact collective action. We performed a behavioral experiment involving an irrigation dilemma. In this dilemma participants invested first into a public fund that generated water resources for the group, which were subsequently appropriated by one participant at a time from head end to tail end. The amount of resource...
Tipo: Peer-Reviewed Reports
Palavras-chave: Asymmetry; Common-pool resources; Feedbacks; Laboratory experiments; Trust; Variability.
Ano: 2015

USING PASSIVE AND ACTIVE MULTISPECTRAL SENSORS ON THE CORRELATION WITH THE PHENOLOGICAL INDICES OF COTTON
Provedor de dados: 70
Autores: Souza,Heloisa B.; Baio,Fabio H. R.; Neves,Danilo C.
ABSTRACT: The investment in precision agriculture technologies has been growing as well the investment in vegetation index sensors with different types of data collection. This study aimed to evaluate the NDVI potential use obtained from passive and active multispectral sensors as phenological parameters indicator of cotton growth. The experiment was conducted in cultivated cotton fields during the harvest seasons of 2013/14 and 2014/15. The phenological variables analyzed in the field, were cotton plant height and number of branches per sampled cotton plant. The active sensors Crop Circle and Green Seeker were mounted on a manual support. The passive sensor Tetracam was installed on a support positioning the sensor at 4 m height from the ground. NDVI...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vegetation index; Variability; Multispectral sensors.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400782

QUALITY OF MECHANICAL SOYBEAN HARVESTING AT TWO TRAVEL SPEEDS
Provedor de dados: 70
Autores: Lima,Felipe B. F. De; Silva,Michel A. F. Da; Silva,Rouverson P. Da.
ABSTRACT: Soybean harvesting is the last operation performed in the field and therefore has high added value. Quantitative losses during this process should therefore be minimized to achieve maximum quality and increase the sustainability of the production system. The aim of the present study was to determine and characterize the quantitative losses and operational characteristics of an axial-flow combine harvester, using tools from Statistical Quality Control to determine the quality of the harvesting operation. The experiment was designed in accordance with the assumptions of statistical process control, with a total of 40 sampling points monitored over time. Quality indicators of harvester performance and crop agronomic characteristics were evaluated at...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Control charts; Variability; Harvesting losses.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601171

Observations and comments on the diatom Stephanodiscus minutulus (Kützing) Cleve &amp;amp; Möller (Bacillariophyceae) found for the first time in Chile from bottom sediments collected in Lake Laja
Provedor de dados: 73
Autores: Cruces,Fabiola; Rivera,Patricio; Urrutia,Roberto.
This study reports the presence of the diatom Stephanodiscus minutulus (Kützing) Cleve &amp;amp; Möller for the frst time in Chilean continental waters; it is a taxon reported in many aquatic systems in Europe and North America and there are only scanty records from South America (Argentina). The species was found in a sedimentary profle collected from Lake Laja (Andes Mountains), Central Chile. The principal morphological features of S. minutulus are described, and comments about its relationship with other closely related taxa are given.
Tipo: Journal article
Palavras-chave: Morphology; New record; Related taxa; Variability; Trophic state.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432010000100002

Mitochondrial genetic variability of Didelphis albiventris (Didelphimorphia, Didelphidae) in Brazilian localities
Provedor de dados: 74
Autores: Sousa,Luciene C.C.; Gontijo,Célia M.F.; Botelho,Helbert A.; Fonseca,Cleusa G.
Didelphis albiventris is a well-known and common marsupial. Due to its high adaptability, this very widespread generalist species occurs under various environmental conditions, this even including protected regions and disturbed urban areas. We studied a 653 bp fragment of cytochrome oxidase c (COI) from 93 biological samples from seven Brazilian localities, with linear distances ranging between 58 and about 1800 km to analyze the effects of geographic distances on variability and genetic differentiation. The haplotype network presented nine haplotypes and two genetic clusters compatible with the two most distant geographic areas of the states of Minas Gerais, in the southeast, and Rio Grande do Sul, in the extreme south. As each cluster was characterized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Didelphis albiventris; Marsupial; Variability; COI; Genetic differentiation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300020

Genetic diversity of carotenoid-rich bananas evaluated by Diversity Arrays Technology (DArT)
Provedor de dados: 74
Autores: Amorim,Edson P.; Vilarinhos,Alberto D.; Cohen,Kelly O.; Amorim,Vanusia B.O.; Santos-Serejo,Janay A. dos; Silva,Sebastião Oliveira e; Pestana,Kátia N.; Santos,Vânia J. dos; Paes,Norma S.; Monte,Damares C.; Reis,Ronaldo V. dos.
The aim of this work was to evaluate the carotenoid content and genetic variability of banana accessions from the Musa germplasm collection held at Embrapa Cassava and Tropical Fruits, Brazil. Forty-two samples were analyzed, including 21 diploids, 19 triploids and two tetraploids. The carotenoid content was analyzed spectrophotometrically and genetic variability was estimated using 653 DArT markers. The average carotenoid content was 4.73 µg.g-1, and ranged from 1.06 µg.g-1 for the triploid Nanica (Cavendish group) to 19.24 µg.g-1 for the triploid Saney. The diploids Modok Gier and NBA-14 and the triploid Saney had a carotenoid content that was, respectively, 7-fold, 6-fold and 9-fold greater than that of cultivars from the Cavendish group (2.19 µg.g-1)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diploids; Germplasm; Molecular markers; Musa sp.; Variability.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100014

Agronomic performance and genetic dissimilarity among cherry tomato genotypes
Provedor de dados: 75
Autores: Maciel,Gabriel M; Finzi,Rafael R; Carvalho,Fábio J; Marquez,Guilherme R; Clemente,Andressa A.
ABSTRACT The genotypes evaluation in a germplasm bank is essential to determine their commercial or usefulness, as potential parents, in a breeding program. We aimed to detect the genetic diversity of 42 tomato genotypes of cherry type, belonging to the germplasm bank of the Federal University of Uberlândia and, also evaluate their behavior. The experiment was conducted in a greenhouse in randomized block design with 42 treatments and two replications. Ten quantitative traits of agronomic importance were evaluated. The genetic divergence was obtained by multivariate analysis, using the Mahalanobis distance with different clustering methods (UPGMA and Tocher). The hybrids performance was compared by Scott-Knott (p= 0.05) and Dunnett’s test (p= 0.05). UPGMA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Variability; Grape tomato.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000200167

Содержание Zn, Cu, Pb, Cd в гонадах культивируемых Mytilus galloproincialis Lam.
Provedor de dados: 13
Autores: Челядина, Н. С.; Вялова, О. Ю.; Смирнова, Л. Л.
Показана сезонная изменчивость содержания Zn, Cu, Cd, Pb в гонадах самцов и самок. Концентрация РЬ увеличивалась с ростом массы генеративной ткани моллюска, вариабельность этого показателя выше у сам­цов. Медь в генеративной ткани самок содержалась в меньшем количестве, по сравнению с самцами, но её концентрирование стабильно на всех изучаемых стадиях гаметогенеза. Выявлены положительная корреляция между содержанием цинка и кадмия и отрицательная между содержанием цинка и свинца в гонадах мидий.
Tipo: Journal Contribution
Palavras-chave: Тяжёлые металлы; Вариабельность; Мидия; Гонады; Heavy metal; Variability; Mussel; Gonads; Black Sea Heavy metals Variability Gonads Heavy metals Gonads http://aims.fao.org/aos/agrovoc/c_2223 http://aims.fao.org/aos/agrovoc/c_34291.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/238

Análise de correspondência - uma ferramenta útil na comparação de mapas de produtividade.
Provedor de dados: 14
Autores: CARVALHO, J. R. P. de; VIEIRA, S. R.; MORAN, R. C. C. P.
O objetivo deste trabalho é apresentar a análise de correspondência como um método estatístico multivariado que pode ajudar na comparação de mapas de produtividade.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Análise de correspondência; Mapa de produtividade; Krigagem; Variabilidade temporal; Variabilidade espacial; Análise multivariada; Yield mapping; Kriging; Variability; Multivariate analysis.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/7817

Avaliação agronômica de acessos de mandioca de mesa em Paracatu-MG.
Provedor de dados: 14
Autores: VIEIRA, E. A.; FIALHO, J. de F.; SILVA, M. S.
bitstream/CPAC-2010/30388/1/bolpd-226.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Variabilidade genética.; Mandioca; Manihot esculenta; Melhoramento genético vegetal.; Cassava; Plant breeding; Variability; Genetics.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572011

Short term changes in zooplankton community during the summer-autumn transition in the open NW Mediterranean Sea: species composition, abundance and diversity
Provedor de dados: 5
Autores: Raybaud, V.; Nival, P.; Mousseau, L.; Gubanova, A.; Altukhov, D.; Khvorov, S.; Ibanez, F.; Andersen, V.
Short term changes in zooplankton community were investigated at a fixed station in offshore waters of the Ligurian Sea (DYNAPROC 2 cruise, September-October 2004). Mesozooplankton were sampled with vertical WPII hauls (200 mu m mesh-size) and large mesozooplankton, macrozooplankton and micronekton with a BIONESS multinet sampler (500 mu m mesh-size). Temporal variations of total biomass, species composition and abundance of major taxa were studied. Intrusions of low salinity water masses were observed two times during the cruise. The first one, which was the most intense, was associated with changes in zooplankton community composition. Among copepods, the abundance of Calocalanus, Euchaeta, Heterorhabdus, Mesocalanus, Nannocalanus, Neocalanus,...
Tipo: Text
Palavras-chave: Ligurian sea; Wind events; Phytoplankton community; Vertical distributions; Seasonal variations; English channel; Spring bloom; Oregon coast; Variability; Copepods.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00208/31975/30410.pdf

Detecting Regional Modes of Variability in Observation-Based Surface Ocean pCO(2)
Provedor de dados: 5
Autores: Landschuetzer, Peter; Ilyina, Tatiana; Lovenduski, Nicole S.
We use a neural network-based estimate of the sea surface partial pressure of CO2 (pCO(2)) derived from measurements assembled within the Surface Ocean CO2 Atlas to investigate the dominant modes of pCO(2) variability from 1982 through 2015. Our analysis shows that detrended and deseasonalized sea surface pCO(2) varies substantially by region and the respective frequencies match those from the major modes of climate variability (Atlantic Multidecadal Oscillation, Pacific Decadal Oscillation, multivariate ENSO index, Southern Annular Mode), suggesting a climate modulated air-sea exchange of CO2. We find that most of the regional pCO(2) variability is driven by changes in the ocean circulation and/or changes in biology, whereas the North Atlantic variability...
Tipo: Text
Palavras-chave: Ocean; CO2; Variability; Carbon; Climate; Observations.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00675/78733/80972.pdf

Bifurcation of the subtropical south equatorial current against New Caledonia in December 2004 from a hydrographic inverse box model
Provedor de dados: 5
Autores: Ganachaud, Alexandre; Gourdeau, Lionel; Kessler, William.
The South Equatorial Current (SEC), the westward branch of the South Pacific subtropical gyre, extends from the equator to 30 degrees S at depth. Linear ocean dynamics predict that the SEC forms boundary currents on the eastern coasts of the South Pacific islands it encounters. Those currents would then detach at the northern and southern tips of the islands, and cross the Coral Sea in the form of jets. The Fiji Islands, the Vanuatu archipelago, and New Caledonia are the major topographic obstacles on the SEC pathway to the Australian coast. Large-scale numerical studies, as well as climatologies, suggest the formation of three jets in their lee: the north Vanuatu jet (NVJ), the north Caledonian jet (NCJ), and the south Caledonian jet (SCJ), implying a...
Tipo: Text
Palavras-chave: Tropical Pacific ocean; Depth integrated flow; Zonal jets; Coral sea; Circulation; Waters; Variability; Generation; Island; Heat.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00207/31809/30221.pdf

Seasonal Mesoscale and Submesoscale Eddy Variability along the North Pacific Subtropical Countercurrent
Provedor de dados: 5
Autores: Qiu, Bo; Chen, Shuiming; Klein, Patrice; Sasaki, Hideharu; Sasai, Yoshikazu.
Located at the center of the western North Pacific Subtropical Gyre, the Subtropical Countercurrent (STCC) is not only abundant in mesoscale eddies, but also exhibits prominent submesoscale eddy features. Output from a 1/30 degrees high-resolution OGCM simulation and a gridded satellite altimetry product are analyzed to contrast the seasonal STCC variability in the mesoscale versus submesoscale ranges. Resolving the eddy scales of &gt;150 km, the altimetry product reveals that the STCC eddy kinetic energy and rms vorticity have a seasonal maximum in May and April, respectively, a weak positive vorticity skewness without seasonal dependence, and an inverse (forward) kinetic energy cascade for wavelengths larger (shorter) than 250 km. In contrast, the...
Tipo: Text
Palavras-chave: Circulation/ Dynamics; Eddies; Instability; Mesoscale processes; Observational techniques and algorithms; Altimetry; Models and modeling; Ocean models; Variability; Seasonal variability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00245/35588/34142.pdf

A high-resolution study of Holocene paleoclimatic and paleoceanographic changes in the Nordic Seas
Provedor de dados: 5
Autores: Risebrobakken, B; Jansen, E; Andersson, C; Mjelde, E; Hevroy, K.
High-resolution records from IMAGES core MD95-2011 in the eastern Norwegian Sea provide evidence for relatively large- and small-scale high-latitude climate variability throughout the Holocene. During the early and mid-Holocene a situation possibly driven by consistent stronger westerlies increased the eastward influence of Arctic intermediate and near-surface waters. For the late Holocene a relaxation of the atmospheric forcing resulted in increased influence of Atlantic water. The main changes in Holocene climate show no obvious connection to changing solar irradiance, and spectral analysis reveals no consistent signature for any periodic behavior of Holocene climate at millennial or centennial timescales. There are, however, indications of consistent...
Tipo: Text
Palavras-chave: Holocene; Climate; Nordic Seas; NAO; High resolution; Variability.
Ano: 2003
URL: https://archimer.ifremer.fr/doc/00224/33500/32119.pdf

Surface circulation in the Eastern Mediterranean using drifters (2005-2007)
Provedor de dados: 5
Autores: Gerin, R.; Poulain, P. -m.; Taupier-letage, Isabelle; Millot, C.; Ben Ismail, S.; Sammari, Cherif.
Within the framework of the EGITTO/EGYPT programs, the spatial structure and the temporal variability of the surface circulation in the eastern basin of the Mediterranean Sea was studied with satellite-tracked drifters. A total of 97 drifters drogued to 15-m nominal depth were released between September 2005 and March 2007, regularly along ship-of-opportunity routes in the Sicily Channel and within specific structures during dedicated campaigns in the Levantine sub-basin. This study complements previous ones in the former and in the Ionian, but it is the first one in the latter. After editing and low-pass filtering, the drifter trajectories were used to estimate pseudo-Eulerian statistics: mean current, variance ellipses, mean and eddy kinetic energies. A...
Tipo: Text
Palavras-chave: Lagrangian drifters; General circulation; Undrogued drifters; Sea; Variability; Features; Basin; Model; Dynamics.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00204/31480/29891.pdf

On the Movements of the North Atlantic Subpolar Front in the Preinstrumental Past*
Provedor de dados: 5
Autores: Marchal, Olivier; Waelbroeck, Claire; Colin De Verdiere, Alain.
Three sediment records of sea surface temperature (SST) are analyzed that originate from distant locations in the North Atlantic, have centennial-to-multicentennial resolution, are based on the same reconstruction method and chronological assumptions, and span the past 15 000 yr. Using recursive least squares techniques, an estimate of the time-dependent North Atlantic SST field over the last 15 kyr is sought that is consistent with both the SST records and a surface ocean circulation model, given estimates of their respective error (co)variances. Under the authors' assumptions about data and model errors, it is found that the 10 degrees C mixed layer isotherm, which approximately traces the modern Subpolar Front, would have moved by ~15 degrees of...
Tipo: Text
Palavras-chave: Inverse methods; Kalman filters; Climate variability; Circulation/ Dynamics; Geographic location/entity; Oceanic variability; Variability; Mathematical and statistical techniques; Fronts; North Atlantic Ocean.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00318/42922/42423.pdf

Impact of temperature inversions on SST evolution in the South-Eastern Arabian Sea during the pre-summer monsoon season
Provedor de dados: 5
Autores: Durand, F; Shetye, Sr; Vialard, Jerome; Shankar, D; Shenoi, Ssc; Ethe, C; Madec, G.
Temperature inversions are known to occur in the near-surface ocean regime where salinity stratification is large enough to influence the density field. However, they have not been known as features that alter near-surface processes significantly to influence the sea surface temperature (SST). From the analysis of new observed datasets as well as of state-of-the-art numerical model outputs, this paper shows that heat trapped within a temperature inversion makes significant contribution to warming of the SST in the South-Eastern Arabian Sea during the pre-southwest monsoon season.
Tipo: Text
Palavras-chave: Mixed layer; Toga decade; Ocean; Variability; Salinity; Physics; Model; Onset; OGCM; Pool.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/00203/31424/29815.pdf

Mesoscale eddy variability in the southern extension of the East Madagascar Current: Seasonal cycle, energy conversion terms, and eddy mean properties
Provedor de dados: 5
Autores: Halo, Issufo; Penven, Pierrick; Backeberg, Bjoern; Ansorge, Isabelle; Shillington, Frank; Roman, Raymond.
In this study, we used more than 17 years of satellite altimetry observations and output from an ocean model to investigate the mesoscale eddy variability and forcing mechanisms to the south of Madagascar. Analysis of energy conversion terms in the model has shown seasonality on eddy formation, both by barotropic and baroclinic instabilities: maximum in winter (JJA) and minimum in summer (DJF). The eddies were mainly formed in the upper ocean (0–300 m) and at intermediate depths (800–2000 m) by barotropic and baroclinic instabilities, respectively. The former dominated in the southeastern margin of Madagascar, and the latter to the southwest, where the South-East Madagascar Current (SEMC) separates from the continental shelf. Seasonality of the eddy...
Tipo: Text
Palavras-chave: Mesoscale eddies; Barotropic; Baroclinic instabilities; Seasonality; Eddy properties; Variability.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00222/33348/31749.pdf

Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - Third Progress Report 1st January-31st December 1998 - Contract N°FAIR 95-421 Commission of the European Communities
Provedor de dados: 5
Autores: Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Buestel, Dominique; Samain, Jean-francois; Hawkins, A. J. S.; Wilins, N.; Zouros, Eleftherios; Bonhomme, Francois; Thiriot Quievreux, Catherine.
The EU project "GENEPHYS", initiated by the IFREMER laboratory GAP-La Tremblade (Génétique Aquaculture et Pathologie) and CREMA-l'Houmeau (Centre de Recherche en Ecologie Marine et Aquaculture), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main bjectives are : 1. To express the maximum variability of growth, both at the larval stage and at the adult stage, in a oyster population originating from parents of various origins. 2. To check the persistence over the time, of growth performance and related physiological functions. 3. To explain...
Tipo: Text
Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Growth; Absorption efficiency; Oysters; Crassostrea gigas.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00050/16151/13634.pdf

Global Air-Sea CO2 Flux in 22 CMIP5 Models: Multiyear Mean and Interannual Variability*
Provedor de dados: 5
Autores: Dong, Fang; Li, Yangchun; Wang, Bin; Huang, Wenyu; Shi, Yanyan; Dong, Wenhao.
To assess the capability of the latest Earth system models (ESMs) in representing historical global air-sea CO2 flux, 22 models from phase 5 of the Coupled Model Intercomparision Project (CMIP5) are analyzed, with a focus on the spatial distribution of multiyear mean and interannual variability. Results show that the global distribution of air-sea CO2 flux is reasonable in most of the models and that the main differences between models and observationally based results exist in regions with strong vertical movement. The annual mean flux in the 18-member multimodel ensemble (MME; four models were excluded because of their poor performances) mean during 1996-2004 is 1.95 Pg C yr(-1) (1 Pg = 10(15) g; positive values mean into the ocean), and all but one...
Tipo: Text
Palavras-chave: Interannual variability; Model output statistics; Model comparison; Variability; Models and modeling; Ocean models; Ensembles; Climate models.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49421/49858.pdf

General hydrodynamical features in the ligurian sea inferred from the dyome experiment
Provedor de dados: 5
Autores: Taupier-letage, Isabelle; Millot, Claude.
Tipo: Text
Palavras-chave: Hydrodynamique; Mer Ligure; Circulation générale; Moyenne échelle; Variabilité; Hydrodynamics; Ligurian Sea; General circulation; Mesoscale; Variability.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/00110/22125/19761.pdf

Surface flux and ocean heat transport convergence contributions to seasonal and interannual variations of ocean heat content
Provedor de dados: 5
Autores: Roberts, C. D.; Palmer, M. D.; Allan, R. P.; Desbruyeres, Damien; Hyder, P.; Liu, C.; Smith, D.
We present an observation-based heat budget analysis for seasonal and interannual variations of ocean heat content (H) in the mixed layer (H-mld) and full-depth ocean (H-tot). Surface heat flux and ocean heat content estimates are combined using a novel Kalman smoother-based method. Regional contributions from ocean heat transport convergences are inferred as a residual and the dominant drivers of H-mld and H-tot are quantified for seasonal and interannual time scales. We find that non-Ekman ocean heat transport processes dominate H-mld variations in the equatorial oceans and regions of strong ocean currents and substantial eddy activity. In these locations, surface temperature anomalies generated by ocean dynamics result in turbulent flux anomalies that...
Tipo: Text
Palavras-chave: Heat content; Heat transports; Interannual; Surface fluxes; Variability; Heat budget.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00387/49813/50388.pdf

Interactions basses fréquences océan-atmosphère dans l’océan Austral
Provedor de dados: 5
Autores: Maze, Guillaume.
Patterns of interannual variability of the ocean- atmosphere coupled system in the Southern Hemisphere ex- tratropics are studied with a simple dynamical model, in or- der to determine the basic physical processes of interaction independently of tropical forcing. The model used is an at- mospheric quasi-geostrophic model coupled to a "slab" oceanic mixed layer, which includes mean geostrophic advection by the Antarctic Circumpolar Current (ACC). The ocean-atmosphere coupling occurs through surface heat fluxes and Ekman cur- rent heat advection. In a fully coupled simulation, the atmos- pheric part of the model, which includes high frequency tran- sient eddies at midlatitudes, exhibits a strong Southern Annu- lar Mode (SAM) as the first mode of variability...
Tipo: Text
Palavras-chave: Climat; Océan Austral; Mode annulaire; Basse fréquence; Interactions océan-atmosphère; Variabilité; Climat; Southern Ocean; Annular mode; Low frequency; Ocean-atmosphere interactions; Variability.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00186/29734/28147.pdf

Multidecadal variability of the overturning circulation in presence of eddy turbulence
Provedor de dados: 5
Autores: Huck, Thierry; Arzel, Olivier; Sevellec, Florian.
At low-resolution, idealized ocean circulation models forced by prescribed differential surface heat fluxes show spontaneous multidecadal variability depending critically on eddy diffusivity coefficients. The existence of this critical threshold in the range of observational estimates legitimates some doubt on the relevance of such intrinsic oscillations in the real ocean. Through a series of numerical simulations with increasing resolution up to eddy-resolving ones (10 km) and various diapycnal diffusivities, this multidecadal variability proves a generic ubiquitous feature, at least in model versions with a flat bottom. The mean circulation largely changes in the process of refining the horizontal grid (along with the associated implicit viscosity and...
Tipo: Text
Palavras-chave: Circulation/ Dynamics; Meridional overturning circulation; Rossby waves; Turbulence; Variability; Multidecadal variability.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00251/36243/34798.pdf

Reconstructability of 3-Dimensional Upper Ocean Circulation from SWOT Sea Surface Height Measurements
Provedor de dados: 5
Autores: Qiu, Bo; Chen, Shuiming; Klein, Patrice; Ubelmann, Clement; Fu, Lee-lueng; Sasaki, Hideharu.
Utilizing the framework of effective surface quasi-geostrophic (eSQG) theory, we explored the potential of reconstructing the 3D upper ocean circulation structures, including the balanced vertical velocity (w) field, from high-resolution sea surface height (SSH) data of the planned SWOT satellite mission. Specifically, we utilized the 1/30°, submesoscale-resolving, OFES model output and subjected it through the SWOT simulator that generates the along-swath SSH data with expected measurement errors. Focusing on the Kuroshio Extension region in the North Pacific where regional Rossby numbers range from 0.22 to 0.32, we found that the eSQG dynamics constitutes an effective framework for reconstructing the 3D upper ocean circulation field. Using the modeled...
Tipo: Text
Palavras-chave: Variability; Models and modeling; General circulation models; Vertical motion; Circulation/ Dynamics; Quasigeostrophic models; Mesoscale processes; Observational techniques and algorithms; Oceanic variability; Altimetry.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00309/42032/41331.pdf

Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - Second Progress Report 1st January-31st December 1997 - Contract n° FAIR 95-421 Commission of the European Communities
Provedor de dados: 5
Autores: Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Hawkins, A. J. S.; Thiriot Quievreux, Catherine; Wilkins, N. P.; Zouros, Eleftherios; Bonhomme, Francois; Buestel, Dominique; Samain, Jean-francois.
The UE project "GENEPHYS", initiated by the IFREMER laboratory GAP-La Tremblade (Génétique Aquaculture et Pathologie) and CREMA-L'Houmeau (Centre de Recherche en Ecologie marine et Aquaculture), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main objectives are : 1. To express the maximum variability of growth, both at the larval stage and at the adult stage, in a oyster population originating from parents of various origins. 2. To check the persistence over the time, of growth performance and related physiological functions. 3. To explain...
Tipo: Text
Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Absorption efficiency; Growth; Oysters; Crassostrea gigas.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00050/16150/13633.pdf

Déterminisme du recrutement. Séminaire de Nantes, 2-4 juillet 1984
Provedor de dados: 5
Autores: Ifremer.
The causality of recruitment is of paramount importance for the progress of the control of marine living resources, but its study remains technically complax.The aim of the Nantes panel was to evaluate the state of advancement of three running programs on exploited species (sole, scallops and oysters), and to set out the basis of a wider national program of interest for both basic and targeted research.
Tipo: Text
Palavras-chave: Recrutement; Variabilité; Déterminisme; Sole; Coquille St Jacques; Huître; Recruitment; Variability; Causality; Sole; Scallop; Oyster.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/00136/24713/22766.pdf

Diversité génétique chez les huîtres creuses du genre Crassostrea : quelles ressources pour quelle amélioration des productions de C; gigas?
Provedor de dados: 5
Autores: Boudry, Pierre.
Despite the economic importance of oyster farming, knowledge about genetic resources of these species is still limited. The objectives of my research were to provide further information about (1) taxomomy, phylogeny and phylogeography of Crassostrea oysters, (2) to compare C. gigas and C. angulata strains of various geographic origins and (3) to study phenotypic and genetic variation for traits of aquacultural interest in C. gigas. Studies based on DNA polymorphism and chromosomes allowed to improve or correct identification, geographic range and phylogeographic relationships among several species. The comparison of various strains of C. gigas and C. angulata, both in laboratory and field conditions, revealed significant differences among taxa and the...
Tipo: Text
Palavras-chave: Crassostrea  gigas; Cupped oysters; Genetic improvement by selection; Variability; Strains testing; Phylogeny; Genetic resources; Crassostrea gigas; Huîtres creuses; Amélioration par la sélection; Variabilité; Testage de souches; Phylogénie; Ressources génétiques.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/these-3354.pdf

Typology of individual growth in sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Gardeur, J; Lemarie, Gilles; Coves, Denis; Boujard, Thierry.
The individual growth variability of passive integrated transponder tagged sea bass was studied using data sets from two different experiments. In experiment 1 (n = 485), fish submitted to different photoperiod regimes were held in fourteen groups of individual weight of 88 ± 13 g (mean ± SD). In experiment 2 (n = 748, initial weight 243 ± 30 g) fish were held in fifteen groups and had either free or restricted access to diets with three lipid levels. After adjustment for treatment and tank effects, individual growth curves were analysed using multivariate analysis (principal component analysis and clustering) and were modelled using the summary statistics technique. Different growth profiles where characterized. All of them appeared to be curvilinear....
Tipo: Text
Palavras-chave: Variability; Typology; Sea bass; Modelling; Growth curves; Variabilité; Typologie; Bar; Modélisation; Courbes de croissance.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-548.pdf

Dinophysis acuminate (dinophyceae), une espèce à géométrie variable sur les côtes françaises
Provedor de dados: 5
Autores: Lassus, Patrick; Marcaillou-le Baut, Claire.
Tipo: Text
Palavras-chave: Morphologie; Variabilité; Ultrastructure; Croissance; France; Dinophysis acuminata; Europe; Milieu marin; Zone côtière; Phytoplancton; Pyrrophycophyta; Algae; Thallophyta; Morphology; Variability; Ultrastructure; Growth; France; Europe; Marine environment; Coastal zone; Phytoplankton; Pyrrophycophyta; Algae; Thallophyta.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00133/24468/22484.pdf

On which timescales do gas transfer velocities control North Atlantic CO2 flux variability?
Provedor de dados: 5
Autores: Couldrey, Matthew P.; Oliver, Kevin I. C.; Yool, Andrew; Halloran, Paul R.; Achterberg, Eric P.
The North Atlantic is an important basin for the global ocean's uptake of anthropogenic and natural carbon dioxide (CO2), but the mechanisms controlling this carbon flux are not fully understood. The air-sea flux of CO2, F, is the product of a gas transfer velocity, k, the air-sea CO2 concentration gradient, Delta pCO(2), and the temperature-and salinity-dependent solubility coefficient, alpha, k is difficult to constrain, representing the dominant uncertainty in F on short (instantaneous to interannual) timescales. Previous work shows that in the North Atlantic, Delta pCO(2) and k both contribute significantly to interannual F variability but that k is unimportant for multidecadal variability. On some timescale between interannual and multidecadal, gas...
Tipo: Text
Palavras-chave: Carbon flux; Gas transfer velocity; Carbon cycle; Ocean model; Climate dynamics; Variability.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00383/49418/49868.pdf

Genetic bases and variability of physiological traits involved in growth in Crassostrea gigas - First Progress Report 1st January-31st December 1996 - Contract n° FAIR 95-421 Commission of the European Communities
Provedor de dados: 5
Autores: Gerard, Andre; Boudry, Pierre; Bougrier, Serge; Hawkins, A. J. S.; Thiriot Quievreux, Catherine; Wilkinns, N. P.; Zouros, Eleftherios; Bonhomme, Francois.
The EEC project "Genephys 1996-2000", initiated by the IFREMER laboratory GAP (Génetique, Aquaculture et Pathologie, La Tremblade and CREMA (Centre de Recherche en Ecologie Marine et Aquaculture, l'Houmeau), aims to establish the relationships between physiological traits involved in growth (oxygen consumption, absorption efficiency, scope for growth) and their genetic bases (determinism, variability within and among populations) in cupped oyster Crassostrea gigas. The main objectives are: 1- To express the maximum variability of growth, both at the larval stage and at the adult stage, in an oyster population originating from parents of various origins. 2- To check the persistence over the time, of growth performance and related physiological functions. 3-...
Tipo: Text
Palavras-chave: Genetic; Determinism; Variability; Physilogy; Oxygen consumption; Absorption efficiency; Growth; Oysters; Crassostrea gigas.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00050/16149/13632.pdf

Mediterranean intermediate circulation estimated from Argo data in 2003-2010
Provedor de dados: 5
Autores: Menna, M.; Poulain, P. M.
Data from 38 Argo profiling floats are used to describe the intermediate Mediterranean currents for the period October 2003-January 2010. These floats were programmed to execute 5-day cycles, to drift at a neutral parking depth of 350 m and measure temperature and salinity profiles from either 700 or 2000 m up to the surface. At the end of each cycle the floats remained at the sea surface for about 6 h, enough time to be localised and transmit the data to the Argos satellite system. The Argos positions were used to determine the float surface and intermediate displacements. At the surface, the float motion was approximated by a linear displacement and inertial motion. Intermediate velocities estimates were used to investigate the Mediterranean circulation...
Tipo: Text
Palavras-chave: Surface circulation; Tyrrhenian sea; North atlantic; Variability; Deep; Currents; Floats; Features; Strait; Waters.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00204/31477/29894.pdf

Inclusion of ecological, economic, social, and institutional considerations when setting targets and limits for multispecies fisheries
Provedor de dados: 5
Autores: Rindorf, Anna; Dichmont, Catherine M.; Thorson, James; Charles, Anthony; Clausen, Lotte Worsoe; Degnbol, Poul; Garcia, Dorleta; Hintzen, Niels T.; Kempf, Alexander; Levin, Phillip; Mace, Pamela; Maravelias, Christos; Minto, Coilin; Mumford, John; Pascoe, Sean; Prellezo, Raul; Punt, Andre E.; Reid, David G.; Roeckmann, Christine; Stephenson, Robert L.; Thebaud, Olivier; Tserpes, George; Voss, Ruediger.
Targets and limits for long-term management are used in fisheries advice to operationalize the way management reflects societal priorities on ecological, economic, social and institutional aspects. This study reflects on the available published literature as well as new research presented at the international ICES/Myfish symposium on targets and limits for long term fisheries management. We examine the inclusion of ecological, economic, social and institutional objectives in fisheries management, with the aim of progressing towards including all four objectives when setting management targets or limits, or both, for multispecies fisheries. The topics covered include ecological, economic, social and governance objectives in fisheries management, consistent...
Tipo: Text
Palavras-chave: Ecosystem-based fisheries management; Multiple objectives; Reference points; Sustainability; Variability.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00381/49262/49838.pdf

The Mediterranean Targeted Project MATER - a multiscale approach of the variability of a marine system - overview
Provedor de dados: 5
Autores: Monaco, André; Peruzzi, Stefano.
The papers presented in this volume represent only a small part of the results obtained within the scope of the first integrated programme concerning the Mediterranean Sea. The latter is considered as a downscaled model of the ocean system, and a regional sea for the targeted projects supported by the European Commission. Whatever the domain is, the variability of the system appeared as a major feature. Consequently, this theme has been selected, among the main initial objectives, as the central subject of this volume. Spatial and temporal variabilities are considered, at different scales and at different (water, particles, sediment, trophic) levels of the marine ecosystem. In the hereafter contributions, one will find the long-term (millenar, secular and...
Tipo: Text
Palavras-chave: Climate; Pluridisciplinary; Variability; Mediterranean; Marine system.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-783.pdf

Intraseasonal response of the northern Indian Ocean coastal waveguide to the Madden-Julian Oscillation
Provedor de dados: 5
Autores: Vialard, Jerome; Shenoi, S. S. C.; Mccreary, J. P.; Shankar, D.; Durand, F.; Fernando, V.; Shetye, S. R.
A new observational record of upper-ocean currents at 15 degrees N on the western coast of India is dominated by intraseasonal (55 - 110 day) variations of alongshore currents, whereas sea level at the same location has a clear seasonal signal. These observations can be interpreted within the framework of linear wave theory. At 15 degrees N, the minimum period for planetary waves is similar to 90 day, meaning that intraseasonal energy is largely trapped at the coast in the form of poleward-propagating Kelvin waves, while lower-frequency signals associated with the annual cycle can radiate offshore as planetary waves. This dynamical difference results in a steeper offshore slope of sea level at intraseasonal timescale, and thus stronger geostrophic...
Tipo: Text
Palavras-chave: Variability; Dynamics; Circulation; Currents.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00185/29631/27993.pdf

Indo-Pacific Sea surface temperature perturbations associated with intraseasonal oscillations of tropical convection
Provedor de dados: 5
Autores: Duvel, Jean Philippe; Vialard, Jerome.
The intraseasonal variability (ISV; 20-90 days) of the SST is examined using 7 yr of data from the Tropical Rainfall Measuring Mission's (TRMM) Microwave Imager ( TMI). The ISV of the SST is larger in the summer hemisphere and in regions of relatively small ocean mixed layer depth (MLD). For these regions, the reddening of the SST spectrum in regard to the surface flux spectrum suggests that the ISV of the SST is mostly controlled by the integration of the local surface forcing by ocean mixed layer. However, the precise origin of large-scale organized perturbations of the SST also depends on region and season. Since the ISV of the convection is an intermittent phenomenon, the local mode analysis (LMA) technique is used to detect only the ensemble of...
Tipo: Text
Palavras-chave: Madden julian oscillation; Western indian ocean; Summer monsoon; Mixed layer; Warm pool; Variability; Fluxes; Model; Atmosphere; Bengal.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00185/29638/27986.pdf

Variability of mechanical properties of flax fibres for composite reinforcement. A review
Provedor de dados: 5
Autores: Baley, Christophe; Gomina, Moussa; Breard, Joel; Bourmaud, Alain; Davies, Peter.
Flax fibres are a promising reinforcement in the development of biocomposites and are finding new applications in transport structures. However, there is a perceived problem with plant fibres related to the variability of the properties of these natural materials. This paper describes the factors which affect variability, from plant growth conditions to fibre sampling and testing. A large number of test results are presented (characterization of elementary fibres, bundles, assemblies of bundles, and unidirectional composites), and it is shown that provided fibre supply is carefully controlled, characterization procedures are appropriate, and manufacturing processes are optimal then excellent composite properties can be achieved with low variability.
Tipo: Text
Palavras-chave: Flax fibre; Composite; Variability; Mechanical properties.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00593/70488/68656.pdf

Hydrothermal Vent Ecosystems
Provedor de dados: 5
Autores: Fisher, Charles R.; Takai, Ken; Le Bris, Nadine.
Tipo: Text
Palavras-chave: Upper temperature limit; Pompeii worms; Field; Variability; Thermotolerance; Environments; Communities; Life.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6109.pdf

Origin, formation and variability of the Subpolar Mode Water located over the Reykjanes Ridge
Provedor de dados: 5
Autores: De Boisseson, Eric; Thierry, Virginie; Mercier, Herle; Caniaux, G.; Desbruyeres, Damien.
The origin and formation of the Subpolar Mode Water (SPMW) located over the Reykjanes Ridge in the North-Atlantic Ocean and the variability of its properties over the period 1966-2004 are investigated through the use of a global eddy-permitting (1/4 degrees) ocean/sea-ice model and a Lagrangian analysis tool. The SPMW is fed by subtropical and subpolar waters advected by the branches of the North-Atlantic Current. The SPMW acquires its properties when its source waters enter the winter mixed layer in the Iceland Basin. The SPMW temperature variability is mainly explained by variations of the relative contributions of the subtropical and subpolar water transports to the total transport. Compared to the 1966-2004 mean, lower (higher) subtropical water...
Tipo: Text
Palavras-chave: Iceland Basin; Lagrangian analysis; North Atlantic current; Subpolar mode water; Variability.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00114/22510/20192.pdf

Variation that can be expected when using particle tracking models in connectivity studies
Provedor de dados: 5
Autores: Hufnagl, Marc; Payne, Mark; Lacroix, Genevieve; Bolle, Loes J.; Daewele, Ute; Dickey-collas, Mark; Gerkema, Theo; Huret, Martin; Janssen, Frank; Kreus, Markus; Paetsch, Johannes; Pohlmann, Thomas; Ruardij, Piet; Schrum, Corinna; Skogen, Morten D.; Tiessen, Meinard C. H.; Petitgas, Pierre; Van Beek, Jan K. L.; Van Der Veer, Henk W.; Callies, Ulrich.
Hydrodynamic Ocean Circulation Models and Lagrangian particle tracking models are valuable tools e.g. in coastal ecology to identify the connectivity between offshore spawning and coastal nursery areas of commercially important fish, for risk assessment and more for defining or evaluating marine protected areas. Most studies are based on only one model and do not provide levels of uncertainty. Here this uncertainty was addressed by applying a suite of 11 North Sea models to test what variability can be expected concerning connectivity. Different notional test cases were calculated related to three important and well-studied North Sea fish species: herring (Clupea harengus), and the flatfishes sole (Solea solea) and plaice (Pleuronectes platessa). For sole...
Tipo: Text
Palavras-chave: Ocean circulation; Lagrangian approach; Variability; Marine protected areas; Renewable energy; Wind park; Model intercomparison; Ensemble.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00385/49660/50198.pdf

A mid-Holocene transition in the nitrogen dynamics of the western equatorial Pacific: Evidence of a deepening thermocline?
Provedor de dados: 5
Autores: Kienast, M.; Lehmann, M. F.; Timmermann, A.; Galbraith, E.; Bolliet, T.; Holboum, A.; Normandeau, C.; Laj, C.
Sedimentary delta(15)N records from the oligotrophic western equatorial Pacific (WEP) off Mindanao show that late Holocene sedimentary delta(15)N is substantially lower than that of the early Holocene, following a gradual &gt;3 parts per thousand decrease that occurred between 7 and 3 kyrs ago. Analyses of modem day nitrate isotope profiles from the same region indicate the sensitivity of the WEP N pools towards (1) the advection of (15)N-enriched nitrate from the Eastern Equatorial Pacific (EEP) by the North Equatorial Current (NEC) and the Mindanao Current in subsurface waters and, (2) at shallow depths, the input of new and (15)N-depleted nitrate through N, fixation. We suggest that the Holocene decrease in sedimentary delta(15)N reflects a diminished...
Tipo: Text
Palavras-chave: Tropical Pacific; El Nino; Surface temperature; Fresh water; Nitrate; Mindanao; Ocean; Variability; Holocene; Seawater.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00207/31843/30257.pdf

Estimated reservoir ages of the Black Sea since the last glacial
Provedor de dados: 5
Autores: Kwiecien, O.; Arz, H. W.; Lamy, F.; Wulf, S.; Bahr, A.; Roehl, U.; Haug, G. H.
Accelerator mass spectrometry (AMS) radiocarbon dating of ostracod and gastropod shells from the southwestern Black Sea cores combined with tephrochronology provides the basis for studying reservoir age changes in the late-glacial Black Sea. The comparison of our data with records from the northwestern Black Sea shows that an apparent reservoir age of similar to 1450 C-14 yr found in the glacial is characteristic of a homogenized water column. This apparent reservoir age is most likely due to the hardwater effect. Though data indicate that a reservoir age of similar to 1450 C-14 yr may have persisted until the Bolling-Allerod warm period, a comparison with the GISP2 ice-core record suggests a gradual reduction of the reservoir age to similar to 1000 C-14...
Tipo: Text
Palavras-chave: Mediterranean abyssal sediments; Minoan eruption; Tephra layers; Radiocarbon; Santorini; Deglaciation; History; Variability; Calibration; Resolution.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00209/31990/30430.pdf

Ocean-Atmosphere Coupling in the Monsoon Intraseasonal Oscillation: A Simple Model Study
Provedor de dados: 5
Autores: Bellon, Gilles; Sobel, Adam H.; Vialard, Jerome.
A simple coupled model is used in a zonally symmetric aquaplanet configuration to investigate the effect of ocean-atmosphere coupling on the Asian monsoon intraseasonal oscillation. The model consists of a linear atmospheric model of intermediate complexity based on quasi-equilibrium theory coupled to a simple, linear model of the upper ocean. This model has one unstable eigenmode with a period in the 30-60-day range and a structure similar to the observed northward-propagating intraseasonal oscillation in the Bay of Bengal/west Pacific sector. The ocean-atmosphere coupling is shown to have little impact on either the growth rate or latitudinal structure of the atmospheric oscillation, but it reduces the oscillation's period by a quarter. At latitudes...
Tipo: Text
Palavras-chave: Madden julian oscillation; Tropical circulation model; Sea surface temperature; Asian summer monsoon; Convective perturbations; Walker circulation; Radiation budget; Indian ocean; Variability; Simulation.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00185/29637/27987.pdf

On the ocean salinity stratification observed at the eastern edge of the equatorial Pacific warm pool
Provedor de dados: 5
Autores: Maes, Christophe.
The observations collected during a series of three oceanographic cruises dedicated to the study of the frontal zone at the eastern edge of the equatorial Pacific warm pool are used to study the role of salinity in the static stratification of the ocean upper layers. By combining physical and biogeochemical data, the position of the frontal zone at the surface could be accurately determined between 157.5 degrees E and 173.4 degrees E. A multiparameter approach is required due to the uncertainty that may result when one parameter is only considered. In the subsurface the thermohaline structures around the frontal zone reveal the predominant role of the ocean salinity stratification within the isothermal layers. However, the actual methods to determine the...
Tipo: Text
Palavras-chave: Atmosphere response experiment; Nino southern oscillation; Sea surface temperature; Barrier layer formation; Westerly wind bursts; El nino; Mixed layer; Fresh pool; Toga coare; Variability.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00208/31886/30312.pdf

Etude de la variabilité de la circulation du gyre subpolaire de l'Atlantique Nord à partir des données Ovide et de mesures satellitaires
Provedor de dados: 5
Autores: Gourcuff, Claire.
The cyclonic circulation of the North Atlantic subpolar gyre, between 50°N and 63°N, plays a key role in the climate variability. The Ovide program contributes to the observation of the circulation in this region. A section is repeated every two years in summer since 2002 between Greenland and Portugal following a path close the Fourex 1997 section. To get transport estimates across the sections, a geostrophic box inverse model is used, constrained with direct current measurements.  Our new estimates of Fourex transports show the need to use constraints temporally associated with the section to get transports estimates representative of the circulation at the section realisation dates. It is also shown that altimetry velocities can be used instead of ADCP...
Tipo: Text
Palavras-chave: Inverse Model; Courantology; Geostrophy; Altimetry; East Greenland Coastal Current; Freshwater fluxes; Heat transport; Meridionnal Overturning Circulation (MOC); Variability; North Atlantic; Subpolar gyre; Ovide; Modèle inverse; Géostrophie; Courantométrie; Altimétrie; Courant Côtier Est Groenlandais; Flux d'eau douce; Transport de chaleur; Circulation Méridienne de Retournement (MOC); Variabilité; Atlantique Nord; Gyre subpolaire; Ovide.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6226.pdf

Morphometry and Vascularization of the Rabbit Kidneys (Oryctolagus cuniculus)
Provedor de dados: 77
Autores: Santos-Sousa,C. A; Stocco,A. V; Mencalha,R; Jorge,S. F; Abidu-Figueiredo,M.
Rabbits have been used as urologic models in many studies. The aim of this study was to characterize the renal morphology and anatomical variations of the renal pedicle in rabbit. The research ethics committee of Rio de Janeiro Federal Rural University approved this study. The animals were obtained from the university's necropsy unit. Dissections were performed in 50 adult rabbits, male and females, without macroscopic renal pathology. Kidney measurements were made with a digital caliper: length, width, and thickness. The length and origin of the renal arteries and main branches and length of the renal veins were also determined. The terminology of Nomina Anatomica Veterinaria was followed. The mean and standard deviation of the length of the right kidney...
Tipo: Journal article
Palavras-chave: Blood vessels; Kidney; Measurements; Variability; Rabbit.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400017

Screening of soybean cultivars for chloride tolerance in Argentina
Provedor de dados: 46
Autores: Lúquez,J.E; Briguglio,M.A; Irigoyen,F; Eyherabide,G.A.
Soybean Glycine max [L. (Merrill)] is the most important crop in Argentina, where soil salinization is increasing. Development of salt tolerant cultivars is an effective approach to expand the crop area and minimize yield loss in saline soils. The aim of this work was to screen commercial soybean cultivars for chloride tolerance in three experiments. In the first experiment 37 cultivars were placed in paper rolls wetted with 50 mM NaCl. Germination speed and hypocotyl and radicle length were registered. Twelve cultivars were chloride tolerant as suggested by their hypocotyl and radicle length. In the second experiment, seven cultivars were grown under greenhouse conditions in containers with sandy soil, nutrients and 50 mM NaCl solution. Leaf scorch (LS)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Chloride tolerance; Germination; Screening; Variability; Glycine max [L. (Merrill)].
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332015000300005

A revision of Choleva agilis (Illiger, 1798) and related species (Coleoptera: Staphylinoidea: Cholevidae)
Provedor de dados: 16
Autores: Schilthuizen, M.
The Choleva agilis-group is revised. The three species are redescribed and their zoogeography is discussed. The phylogeny of the three species is hypothesized. Choleva jailensis Jeannel, 1923 and C. agilis clermonti van der Wiel, 1931 are new synonyms of C. agilis (Illiger, 1798). C. lederiana var. brevicollis Krogerus, 1926, is a new synonym of C. lederiana Reitter, 1901. The cavernicolous taxon gracilenta Szymczakowski, 1957, formerly regarded as a subspecies of C. lederiana, is transferred to C. septentrionis Jeannel, 1923.
Tipo: Article / Letter to the editor
Palavras-chave: Cholevidae; Choleva; Key; Phylogeny; Zoogeography; Variability; Europe; 42.75.
Ano: 1990
URL: http://www.repository.naturalis.nl/record/318021

The anatomy of the king crab Hapalogaster mertensii Brandt, 1850 (Anomura: Paguroidea: Hapalogastridae): new insights into the evolutionary transformation of hermit crabs into king crabs
Provedor de dados: 16
Autores: Keiler, J.; Richter, S.; Wirkner, C.S.
The emergence of king crabs from a hermit crab-like ancestor is one of the most curious events in decapod evolution. King crabs comprise two taxa, Lithodidae and Hapalogastridae, and while lithodids have formed the focus of various anatomical studies, the internal anatomy of hapalogastrids has never been studied although this group might represent a more ancestral morphological condition within king crabs than lithodids do. To better understand the evolutionary transformation of pagurid-like hermit crabs into king crabs, we studied the hemolymph vascular system and associated organs of representatives of Hapalogaster and present here the first micro-computer tomography data pertaining to the internal anatomy of hapalogastrids. Our results for...
Tipo: Article / Letter to the editor
Palavras-chave: Anomala; Carcinization; Circulatory system; Evolutionary morphology; Structural coherence; Variability; 42.74; 38.22; 42.62.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/579455

Karyotypes of four species of Xenodontini snakes (Serpentes: Dipsadidae) and implications for taxonomy
Provedor de dados: 16
Autores: Falcione, C.; Hernando, A.; Barrasso, D.A.; Pietro, D. di.
The karyotypes of four South American Xenodontini snake species, Lygophis dilepis, L. meridionalis, L. flavifrenatus and L. anomalus, are here described for the first time. We studied specimens from northeastern Argentina using conventional and silver (Ag-NOR) staining. While the typical ophidian karyotype is 2n = 36, we found that the karyotype of the studied species is 2n = 34, with metacentric and submetacentric chromosome pairs. The Ag-NOR staining revealed that nucleolar organizer regions (NORs) are located on one pair of microchromosomes. In L. dilepis and L. anomalus the 4th chromosome pair is heteromorphic, and we suggest that it might be considered as the ZW sex chromosome pair. The optimization of available karyological data on a molecular...
Tipo: Article / Letter to the editor
Palavras-chave: Karyosystematics; Lygophis; Variability.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/611374

A revision of the polytypic Albinaria hippolyti (Boettger, 1878) from Crete (Gastropoda Pulmonata: Clausiliidae)
Provedor de dados: 16
Autores: Schilthuizen, M.; Welter-Schultes, F.W.; Wiese, V.
On the basis of both detailed distributional field studies and morphological analyses, a revision of the polytypic species Albinaria hippolyti from Central and Eastern Crete is presented. True subspecies are distinguished from mere geographic varieties by the presence of narrow hybrid zones. Using this criterion, four adjoining subspecies are recognised: A. h. hippolyti (Boettger, 1878), A. h. aphrodite (Boettger, 1883), A. h. holtzi (Sturany, 1904) and A. h. harmonia subspec. nov. Additionally, two geographically isolated and conchologically distinctive forms are also treated as subspecies: A. h. arthuriana (Boettger, 1878) and A. h. asterousea subspec. nov. The geographical distribution and variability of each subspecies is described in detail. A. h....
Tipo: Article / Letter to the editor
Palavras-chave: Gastropoda; Pulmonata; Clausiliidae; Albinaria hippolyti; Taxonomy; Hybrid zones; Variability; Zoogeography; 42.73.
Ano: 1993
URL: http://www.repository.naturalis.nl/record/318774

A review of Chorthippus species with angled pronotal lateral keels from Greece with special reference to transitional populations between some Peloponnesean taxa (Orthoptera, Acrididae)
Provedor de dados: 16
Autores: Willemse, F.; Helversen, O. von; Odé, B.
This paper presents a summary of the current knowledge on the systematics of the Greek taxa of Chorthippus, morphologically characterised by angled lateral pronotal keels (usually grouped as Glyptobothrus). Prior to this paper, based on traditional morphology, ten taxa of Chorthippus with angled lateral pronotal keels were recognized from Greece. Based on morphology as well as (and more importantly so) bioacoustics thirteen Greek taxa are now recognised. With addition of a few additional related taxa that occur only outside Greece, all are treated in this paper: Chorthippus apricarius apricarius (Linnaeus, 1758), C. vagans vagans (Eversmann, 1848) (not in Greece), C. v. cypriotus (Uvarov, 1936) stat. nov. [Cyprus], C. v. africanus Nadig, 1981 [N. Africa],...
Tipo: Article / Letter to the editor
Palavras-chave: Chorthippus; Glyptobothrus; Greece; Acrididae; Orthoptera; Morphology; Bioacoustics; Taxonomy; Variability; Transitional or hybrid populations; Phylogeny; Evolution; Palaeobiogeography; Key; Distribution; Ecology; 42.75.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/314191

Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes
Provedor de dados: 83
Autores: Pelicice,Fernando Mayer; Thomaz,Sidinei Magela; Agostinho,Angelo Antonio.
Submerged macrophytes play an important role in structuring habitats and, therefore, in determining patterns of aquatic biodiversity. Because these plants are widespread in shallow areas of many Neotropical reservoirs, the present work investigated if variables related to habitat structure, measured in patches of submerged macrophytes (Egeria densa and E. najas), can be used to predict fish assemblage attributes (fish density and species richness). Based on patch characteristics at fine spatial extents (macrophyte patches within reservoir arms), we considered plant biomass, volume and proportional volume (i.e. percentage of macrophyte volume in the water column) as potential predictors. Fish and macrophytes were sampled with a 1-m² throw trap in littoral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic plants; Habitat structure; Predictive ecology; Variability; Tropical reservoir.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400001

Variabilidad fitoplanctónica en 5 bahías, Islas Galápagos (Ecuador)
Provedor de dados: 20
Autores: Tapia, M.E.; Torres, G.
El aporte de esta investigación, será dar una evaluación sobre la distribución cuali-cuantitativamente del fitoplancton y paralelamente iniciar una base de datos en 5 bahías de las Islas Galpagos.
Tipo: Journal Contribution
Palavras-chave: Variability; Phytoplankton; Chlorophylls; Biomass; Geographical distribution; Species diversity; Phytoplankton; Biomass; Geographical distribution; Chlorophylls; Species diversity; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_33954.
Ano: 2000
URL: http://hdl.handle.net/1834/2239

Dinámica del océano y mares de la plataforma suroccidental de Cuba: variabilidad interanual
Provedor de dados: 20
Autores: Piñeiro Soto, R.; Cobas Gómez, S.
Se presenta un análisis sobre la variabilidad anual en la dinámica oceanográfica del Golfo de Batabanó y la región oceánica adyacente. Son analizadas series anuales de temperatura superficial promedio del mar (TSM), en el período entre 1950 y 2003, de transporte Ekman (TE) entre 1967 y 2008, y del nivel medio mensual del mar (NMM) entre 1972 y 2003. La TSM oceánica fue de 28,02 °C y de 27,64 °C para la plataforma. Las máximas anomalías positivas en la zona oceánica ocurren a finales de los años 1950, inicios del 1960 y entre finales de la década de 1990 y comienzos del 2000. En la plataforma las máximas anomalías positivas ocurren entre 1997 y 1998, y el período 2002-2003. El TE anual presentó una entrada de agua a la plataforma con máximos relacionados...
Tipo: Journal Contribution
Palavras-chave: Variability; Mean sea level.
Ano: 2010
URL: http://hdl.handle.net/1834/4102

Variabilidad oceanográfica en el Estrecho Bransfield asociada con el evento ENSO 1997-1998
Provedor de dados: 20
Autores: Martínez, R.
Dentro de las actividades científicas contempladas en la VII Expedición Ecuatoriana a la Antártida para enero de 1998 en Buque de Investigación de la Armada B/I Orión efectuó un crucero oceanográfico en el Estrecho Branfield. Se efectuaron 14 estaciones oceanográficas hasta 500 metros, se realizaron mediciones de corriente utilizando un perfilador acústico doppler. Tomando como referencia trabajos anteriores en el área en años sin influencia de eventos cálidos se compararon los parámetros físicos. Luego del análisis se concluye que el evento ENSO 97-98 tuvo repercusiones evidentes en el área de estudio manifestada en dos aspectos básicos: El incremento de la temperatura y la disminución de la salinidad a nivel superficial. Esta variación habría generado un...
Tipo: Journal Contribution
Palavras-chave: Variability; Thermohaline circulation; Salinity; Water masses; El Nino phenomena; Cruises; Research vessels; Salinity.
Ano: 1998
URL: http://hdl.handle.net/1834/3838

Environmental Design and Analysis in Marine Environmental Sampling
Provedor de dados: 20
Autores: Underwood, A.J.
The IOC-IMO-UNEP/GIPME Groups of Experts on Effects of Pollution (GEEP) has been working for a number of years on promoting new ways of understanding how pollutants affect marine biological systems. A major initial focus of GEEP was on calibration workshops where different methods were tested against one another. The Oslo (1986), Bermuda (1988) and Bremerhaven (1992) workshop publications are widely regarded as benchmarks demonstrating that biological effects  methods are reliable tools for measurement of the effects of pollutants discharged to the marine  environment. IOC through GEEP, in cooperation with UNEP, has published a series of manuals based on the successful techniques and these are listed at the back of this volume.  Monitoring programmes for...
Tipo: Book
Palavras-chave: Marine Environment; Environmental monitoring; Environment management; Variability; Marine environment; Measurement; Environmental monitoring; Marine environment; Measurement; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_4610; Http://aims.fao.org/aos/agrovoc/c_4668.
Ano: 1996
URL: http://hdl.handle.net/1834/2794

Parámetros poblacionales de la langosta común del Caribe (panulirus argus): su relación con la variabilidad ambiental
Provedor de dados: 20
Autores: de León, M.E.; Puga, R.; Piñeiro, R.
El crecimiento, la supervivencia, el reclutamiento, la reproducción y la abundancia son parámetros de vida que caracterizan a cada población y son la consecuencia de cómo ha transcurrido su ciclo de vida. Las diferencias en estos parámetros en la escala espacial han sido usadas para identificar medidas de manejo pesquero por separado entre stocks de la misma especie, asumiendo que la variación fenotípica es debida a controles genotípicos y ambientales, sin embargo, no son muchos los estudios que abordan la variación temporal de estos parámetros. Basado en los monitoreos biológicos mensuales, que se han efectuado desde hace más de 20 años sobre la langosta común del Caribe Panulirus argus, se estimaron las variaciones en los parámetros de crecimiento, la...
Tipo: Preprint
Palavras-chave: Lobster fisheries; Animal populations; Variability.
Ano: 2010
URL: http://hdl.handle.net/1834/3805

Différenciation génétique de quelques populations Tunisiennes d'Artemia leach, 1819 (crustacé, branchiopode)
Provedor de dados: 20
Autores: Ghlala., A.; Charfi-Cheikhrouha., F.
L’analyse du polymorphisme isoenzymatique de 5 populations d’Artemia de Tunisie a été entreprise afin d’évaluer les ressources génétiques de cette espèce et d’estimer la variabilité génétique intra et interpopulationnelle. Cette analyse a été effectuée sur la base de 5 systèmes enzymatiques et 11 loci dont 7 sont polymorphes : PEP3, PEP4, IDH1, IDH2, MDH1, MDH2 et APH. Parmi ces loci, l’IDH2 et la MDH1 peuvent être considérés comme des loci diagnostiques. Les paramètres de diversité génétique estimés pour l’hétérozygotie observée, le taux de polymorphisme et le nombre moyen d’allèles par locus sont de 0.051 à 0.364, de 36.4% à 45.5% et de 1.3 à 1.7 respectivement. Les valeurs des distances génétiques de Nei (1978), calculées à partir des fréquences...
Tipo: Journal Contribution
Palavras-chave: Alleles; Biopolymorphism; Biopolymorphism; Population genetics; Statistical tables; Variability; Alleles; Population genetics; Http://aims.fao.org/aos/agrovoc/c_8724; Http://aims.fao.org/aos/agrovoc/c_34326.
Ano: 2008
URL: http://hdl.handle.net/1834/4233

Variabilidad estacional del plancton en la Bahía de Manta en la costa ecuatoriana, durante el 2011
Provedor de dados: 20
Autores: Naranjo, Ch.; Tapia, M.E.
In 2011, in the Bay of Manta was presented a high diversity of phytoplankton species, determining a total of 75 species, 29 groups for the zooplankton, which were identified to species level the Phylum Chaetognatha identified 6 species and Cladocera with 2 species. The seasonal time during 2011, did not influence the average abundances of the dominant species of phytoplankton and zooplankton, using the student T Test statistic with 95% confidence However specific tests were performed between different stations have a greater diversity of species and stations with less diversity, showing a significant difference in the mean of the population of phytoplankton. The oceanographic conditions recorded in the Equatorial Pacific states mainly cooling during...
Tipo: Journal Contribution
Palavras-chave: Variability; Plankton; Chlorophylls; Biomass; Species diversity; Seasons.
Ano: 2013
URL: http://hdl.handle.net/1834/5760

Inicio, duración y término de la estación lluviosa en cinco localidades de la costa ecuatoriana
Provedor de dados: 20
Autores: Zambrano, E.; Hernández, F.
El objetivo de este trabajo es llegar a definir el inicio, término y duración de la estación lluviosa, mediante el análisis de datos de precipitación a fin de usar los resultados como fechas atribuibles a los cambios de estación climática presentes en la costa ecuatoriana.
Tipo: Journal Contribution
Palavras-chave: Atmospheric precipitations; Rainy season; Daily; Variability; El Nino phenomena; Climatology; Climatic changes; Rainy season; Climatology.
Ano: 2007
URL: http://hdl.handle.net/1834/2507

Variabilidad anual del fitoplancton marino en áreas costeras de La Libertad y Manta (Ecuador), su inter-relación con eventos El Niño
Provedor de dados: 20
Autores: Torres, G.
En este artículo se describen los resultados anuales de la biomasa fitoplanctónica cuantitativa (primer nivel trófico), períodos de mayor densidad fitoplanctónica anual en dos estaciones fijas de Manta (1991-1997), La Libertad (1994-1997) y su inter-relación en condiciones frías de 1996 y eventos cálidos El Niño en 1991-92 y 1997.
Tipo: Journal Contribution
Palavras-chave: Variability; Distribution; Biomass; Phytoplankton; El Nino phenomena; Distribution; Biomass; Phytoplankton.
Ano: 1998
URL: http://hdl.handle.net/1834/2328

Estimaciones satelitales de clorofila y los frentes oceánicos del Atlántico Sudoccidental
Provedor de dados: 20
Autores: Romero, S.I.
Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales (Argentina)
Tipo: Theses and Dissertations
Palavras-chave: Chlorophylls; Continental shelves; Shelf fronts; Estuarine front; Shelf edge fronts; Variability; Phytoplankton; Photosynthesis; Satellite sensing; Phytoplankton; Chlorophylls; Continental shelves; Photosynthesis; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_32413; Http://aims.fao.org/aos/agrovoc/c_5812.
Ano: 2008
URL: http://hdl.handle.net/1834/2827

Short-term variability in alongshore  winds and temperature off Swakopmund, Namibia, during a non-upwelling event in 1998-1999.
Provedor de dados: 20
Autores: Bartholomae, Ch.; Hagen, E.
Swakopmund is a popular coastal resort in Namibia, especially during the summer holiday season when daily sea temperatures can fluctuate several degrees in a short period. Hourly measurements of the nearbottom water temperature were collected off the Swakopmund Jetty to investigate the thermal variability in relation to local winds. The thermal regime of this coastal region appears to be controlled by the locally forced Ekman offshore transport. Related changes in offshore transport led those of the surf-zone temperature by about one day. A transfer of kinetic energy from the alongshore wind into the temperature field of the nearshore zone dominated relative short time scales (hourly). The longer periods (7–9 days) are associated with the forcing of...
Tipo: Journal Contribution
Palavras-chave: Variability; Winds; Temperature; Upwelling; Fish species; Shelf geology; Currents (water); Anomalies; Surf; Continental shelf; Coastal upwelling; Nearshore environment.
Ano: 2007
URL: http://hdl.handle.net/1834/4936

Variabilidad temporal de la fauna acompañante del camarón Farfantepenaeus notialis en el Golfo de Ana María, Cuba
Provedor de dados: 20
Autores: Valdés, E.; Villafuerte, V.; Domínguez, H.; Pérez, A.
Se analizó la diversidad de la fauna acompañante del camarón en la pesquería del Golfo de Ana María (plataforma suroriental cubana), en términos de la variabilidad temporal de los grupos taxonómicos que la integran y la abundancia relativa de las especies presentes, en particular de la ictiofauna. En el período 2002-2009, los peces fueron el principal integrante de la fauna acompañante del camarón en 82 %, seguido en orden por los crustáceos, moluscos, poríferos y equinodermos con cifras bajas. Resultó poca variabilidad entre los niveles de representatividad de los grupos taxonómicos del período 2002-2008 respecto al 2009. Se determinaron nueve especies de peces representativas (85 % de la captura), siendo dominantes la mojarra (Gerres cinereus), la...
Tipo: Journal Contribution
Palavras-chave: Variability; By-catch; Relative abundance.
Ano: 2011
URL: http://hdl.handle.net/1834/4647

Variabilidad oceanográfica en Ecuador asociada con el evento ENSO 1997-98
Provedor de dados: 20
Autores: Martínez, R.; Zambrano, E.; Garcés Vargas, J.
El objetivo de este artículo es documentar científicamente la evolución del evento "El Niño" en Ecuador, desde el punto de vista oceanográfico, sugiriendo posibles mecanismos involucrados en este proceso, vinculados a ondas interestacionales Kelvin en el océano (Kessler et al., 1995) que actúan como contraparte a las oscilaciones de 60 a 75 días en la atmósfera (Maden - Julian, 1995) y más específicamente de ondas encontradas en los espectros de nivel medio del mar y TSM en el mar ecuatoriano- colombiano con estas mismas características (Martínez, 1998).
Tipo: Journal Contribution
Palavras-chave: Variability; Isotherms; Thermohaline circulation; El Nino phenomena; Surface temperature; Cruises; Kelvin waves; Air temperature; Mean sea level; Salinity charts; Air temperature.
Ano: 2000
URL: http://hdl.handle.net/1834/2245

Variabilidad oceanográfica en el Estrecho Bransfield asociada con el evento ENSO 1997-1998
Provedor de dados: 20
Autores: Martínez, R.
Dentro de las actividades científicas contempladas en la VII Expedición Ecuatoriana a la Antártida para enero de 1998 en Buque de Investigación de la Armada B/I Orión efectuó un crucero oceanográfico en el Estrecho Branfield. Se efectuaron 14 estaciones oceanográficas hasta 500 metros, se realizaron mediciones de corriente utilizando un perfilador acústico doppler. Tomando como referencia trabajos anteriores en el área en años sin influencia de eventos cálidos se compararon los parámetros físicos. Luego del análisis se concluye que el evento ENSO 97-98 tuvo repercusiones evidentes en el área de estudio manifestada en dos aspectos básicos: El incremento de la temperatura y la disminución de la salinidad a nivel superficial. Esta variación habría generado un...
Tipo: Journal Contribution
Palavras-chave: Variability; Thermohaline circulation; Salinity; Water masses; El Nino phenomena; Cruises; Research vessels; Salinity.
Ano: 1998
URL: http://hdl.handle.net/1834/3838

Genetic evaluation and genetic gains with the selection for Jatropha curcas populations
Provedor de dados: 190
Autores: Juhász, Ana Cristina Pinto; Morais, Danielle de Lourdes Batista; Soares, Bruno Oliveira; Pimenta, Samy; Rabello, Hudson de Oliveira; Resende, Marcos Deon Vilela de.
This work aimed at estimating genetic parameters from the vegetative stage in five populations from Jatropha curcas L. The half sib progenies were cultivated at Biojan farm, in Janaúba, MG. Plant height, stem diameter, number of branches and crown projection were assessed in all plants at three and six months old. In population 2, there was no genetic variability for all traits evaluated. The genetic gains estimated with the selection from the ten best individuals in other populations were 4% to 8% for plant height (population 1 and 4), 5% to 7% for stem diameter (population 1 and 5), 14% to 25% for the number or branches (population 3 and 5) and 9% for crown projections in population 4. According to the results obtained from this study, these populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Heritability; Accuracy; Genetic gain. Variabilidade; Herdabilidade; Acurácia; Ganho genético.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/83

Sensitivities of Urochloa decumbens Plants to Glufosinate
Provedor de dados: 87
Autores: BRITO,I.P.F.S.; MARCHESI,B.B.; TROPALDI,L.; CARBONARI,C.A.; VELINI,E.D.
ABSTRACT: This study aimed to assess the response of Urochloa decumbens plants to different doses of glufosinate ammonium, and the sensitivity of plant population to the herbicide. Two studies were conducted, both in greenhouse and repeated at different times. In the dose-response analysis, two experiments were conducted using seven doses of the glufosinate ammonium (0, 50, 100, 200, 400, 800, and 1,600 g a.i. ha-1) with four replications each. In the analysis of sensitivity levels of U. decumbens to herbicide, 44 plants were sprayed with a dose of 200 g a.i. ha-1 of the herbicide. Tissue ammonium content was determined, and injury percentage was visually assessed. Experiment data were converted to mg of ammonium per kg-1 of fresh mass and submitted to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Glutamine synthetase; Weed; Variability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100238

Modelling Climate Change and Agricultural Production in Sub-Saharan Africa (SSA): In Quest of Statistics
Provedor de dados: 31
Autores: Koffi-Tessio,   Egnonto M.
Climate change is a natural and dynamic phenomenon resulting from complex interrelationships between physical, environmental and human factors. The sustainability of life on earth depends partly on the ability of mankind to maintain this natural and balanced flow of such gases such as carbon dioxide (CO2) and water vapor traping heat. Unfortunately, human beings contribute significantly to the presence of such gases known as Green House Gases (GHGs) through agricultural and industrial activities. The implications are the excess trap of sunlight and the blocking of outward radiation. In sub-Saharan Africa (SSA), the importance of agriculture cannot be stressed enough given that it is central to economic growth and most of economic activities in the region...
Tipo: Conference Paper or Presentation
Palavras-chave: Modelling; Agriculture; Climate change; Variability; Statistics; Policies; Environmental Economics and Policy; Farm Management.
Ano: 2009
URL: http://purl.umn.edu/50821

The Effect of Information and Market Access on Adopters' Income Level
Provedor de dados: 31
Autores: Nwankwo,   Uche M.; Wolfgang,   Bokelmann.
This paper is aimed at relating income fluctuation with adoptable innovations, adopter category and their access to some variables than those explained in the neoclassical economics principle of labor market demand and supply equilibrium. Using a quantitative and qualitative case study of some farmers in two States, we considered whether respondents are earning enough income and what constraints they face. The von Hipple’s lead user concept and decision model of risk aversion under uncertainty were used to explain causes of variability. Notably, farmers with enough steady income have access to market, various information and are less risk averse.
Tipo: Conference Paper or Presentation
Palavras-chave: Variability; Information; Income; Adoption; Market.
Ano: 2008
URL: http://purl.umn.edu/48101

The Impact of Feedstock Supply and Petroleum Price Variability on Domestic Biofuel and Feedstock Markets – The Case of the United States
Provedor de dados: 31
Autores: Yano,   Yuki; Blandford,   David; Surry,   Yves R.
The promotion of biofuel use in preference to traditional petroleum-based transportation fuel has linked agricultural commodity markets and energy markets more closely together. Biofuel policies can involve multiple policy instruments, but studies examining their effects on biofuel feedstock and energy markets are scarce. In addition, the impact of alternative policy approaches in the context of variability in petroleum prices and the supply of biofuel feedstock has received limited attention. Focusing on the current situation in the United States, in which prohibitively high duties prevent imports of ethanol, this paper examines how variability in the price of petroleum and corn supply affects domestic market variability under three types of domestic...
Tipo: Working or Discussion Paper
Palavras-chave: Biofuels; Subsidies; Mandates; Variability; Agricultural and Food Policy; International Relations/Trade; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/58486

Renewable energy integration into the Australian National Electricity Market: Characterising the energy value of wind and solar generation
Provedor de dados: 31
Autores: Boerema,   Nicholas; Kay,   Merlinde; MacGill,   Iain.
This paper examines how key characteristics of the underlying wind and solar resources may impact on their energy value within the Australian National Electricity Market(NEM). Analysis has been performed for wind generation using half hour NEM data for South Australia over the 2008-9 financial year. The potential integration of large scale solar generation has been modelled using direct normal solar radiant energy measurements from the Bureau of Meteorology for six sites across the NEM. For wind energy, the level and variability of actual wind farm outputs in South Australia is analysed. High levels of wind generation in that State have been found to have a strong secondary effect on spot prices. Wind generation's low operating costs will see it displacing...
Tipo: Report
Palavras-chave: Energy value; Integration; NEM; Solar; Variability; Wind; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/107740

Do Antibiotics Reduce Production Risk for U.S. Pork Producers?
Provedor de dados: 31
Autores: Liu,   Xuanli; Miller,   Gay Y.; McNamara,   Paul E.
We combine econometric and financial analyses of the NAHMS 2000 Swine Survey data to examine whether evidence exists for reducing risk by using antibiotics for growth promotion (AGP) in the U.S. swine industry. A stochastic dominance analysis of alternative lengths of time (days) of AGP application reveals that AGP used in the range of 65—75 days is preferred by risk-averse producers. Risk is reduced and profits are increased from use of AGP. The combined impacts of increased average daily gain and decreased variability in pig live weight increase producer profits by $2.99 per pig marketed.
Tipo: Journal Article
Palavras-chave: Antibiotics; Growth promotion; Pigs; Risk; Stochastic dominance; Variability; D21; D61; D81; Q12; R32.
Ano: 2005
URL: http://purl.umn.edu/42785

Variability in Quality and Management Practices in the Mango Supply Chain from Costa Rica
Provedor de dados: 31
Autores: Zuniga-Arias,   Guillermo; Ruben,   Ruerd.
Produce quality  is one of the  features of any commodity that everyone has an opinion  about, but quality  is  a complex concept.  In  one  hand, quality  is the  consumer  perception about a certain commodity an as well  it  is a relationship between all the  intrinsic attributes of the commodity.  It is argued that homogeneous  management  activities will increase the quality of the commodity.  Reducing waste for example, but  in a more generic way will reduce the  variability of the commodity plus meeting the  costumer needs and preferences.  In this experimental article we try to disentangle the  managerial  activities  that  have  an  effect  on  the  variability  of  the  quality.    For  this  purpose we have  make use of the dispersion statistics...
Tipo: Conference Paper or Presentation
Palavras-chave: Variability; Supply Chain; Quality; Management; Agribusiness.
Ano: 2007
URL: http://purl.umn.edu/9398

A Comparison of Risk Exposure in Aquaculture and Agricultural Businesses
Provedor de dados: 31
Autores: Flaten,   Ola; Lien,   Gudbrand D.; Tveteras,   Ragnar.
Agriculture and aquaculture have common features associated with their biological nature affecting risk exposure of the businesses. The aim of this paper is to compare risk exposure in salmon farming and agricultural enterprises in Norway by using an implicit error component model to examine the risk structure of yields, prices and economic returns at the farm level. Results indicate a higher farm-level year-to-year variability in yields, prices and economic returns in salmon farming than in agricultural enterprises. The variability in livestock enterprises was generally lower than for crop enterprises. Return on assets was highest in salmon farming with an average annual return of 9.2%. All of the agricultural farm types exhibited a negative average...
Tipo: Conference Paper or Presentation
Palavras-chave: Risk analysis; Variability; Norway; Risk and Uncertainty.
Ano: 2008
URL: http://purl.umn.edu/44052

A financial analysis of the effect of the mix of crop and sheep enterprises on the risk profile of dryland farms in south-eastern Australia
Provedor de dados: 31
Autores: Hutchings,   Timothy R.; Nordblom,   Thomas L.
This study analyses the financial risk faced by representative mixed-enterprise farm businesses in four regions of south-eastern Australia. It uses discrete stochastic programming to optimise the ten-year cash flow margins produced by these farms, operating three alternative farming systems. Monte Carlo simulation analysis is used to produce a risk profile for each scenario, derived from multiple runs of this optimised model, randomised for commodity prices and decadal growing season rainfall since 1920. This analysis shows that the performance of the enterprise mixes at each site is characterised more by the level of variability of outcomes than by the mean values of financial outputs. It demonstrates that relying on mean values for climate and prices...
Tipo: Article
Palavras-chave: Farm management; Financial risk; Climate risk; Price risk; Variability; Farm Management.
Ano: 2011
URL: http://purl.umn.edu/120908

Whole farm analysis-Fertiliser nitrogen can reduce deep drainage and increase profitability
Provedor de dados: 31
Autores: Scott,   J. Fiona.
Opportunity cropping has been shown to reduce mean annual deep drainage compared to long fallow systems. A question that remained was the effect of added fertiliser nitrogen under each of the cropping systems and whether it would make a significant difference to amounts of deep drainage and to profitability. Estimates of crop yield and deep drainage results were generated using the APSLM (Agricultural Production Systems Simulator) cropping systems model, to compare long-fallow wheat/sorghum and two opportunity-cropping scenarios on a vertosol on the Liverpool Plains using rainfall data from 1958 to 1997. The results showed that fertiliser nitrogen did have a significant effect on deep drainage and gross margin under each cropping system. However, higher...
Tipo: Conference Paper or Presentation
Palavras-chave: Cropping systems; Profitability; Modelling; Variability; Whole farm budgeting; Farm Management; Land Economics/Use.
Ano: 2004
URL: http://purl.umn.edu/59705

SISTEMAS ECOLÓGICOS DE PRODUÇÃO DE SEMENTES E FORRAGEM DE FEIJÃO-MIÚDO
Provedor de dados: 31
Autores: Bevilaqua,   Gilberto Antonio Peripolli; Antunes,   Iraja Ferreira; Marques,   Robson Luis Legorio; Maia,   Manoel Souza.
A cultura do feijão-miúdo tem crescido em importância na região de clima temperado, principalmente em áreas da agricultura familiar, utilizando sistemas de base ecológica, visando a alimentação de ruminantes. Na região da planície costeira do Rio Grande do Sul a cultura apresenta grande desenvolvimento e tem se espalhado mais recentemente para outras áreas, no entanto sem informações técnicas sobre o seu manejo. A rusticidade da planta é reconhecida largamente, vegetando bem em solos mal drenados, arenosos e de baixa fertilidade, salinos e com baixa disponibilidade de água, sendo especialmente indicada como recuperadora de solo. Sua multiplicidade de usos tornou-a uma importante opção aos agricultores familiares, podendo ser utilizada além de recuperadora...
Tipo: Conference Paper or Presentation
Palavras-chave: Vigna unguiculata; Fenologia; Variabilidade; Pastoreio; Leite; Fenology; Variability; Grazing; Milk; Crop Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/109773

International Variability in Biofuel Trade: An Assessment of U.S. Policies
Provedor de dados: 31
Autores: Yano,   Yuki; Blandford,   David; Surry,   Yves R.
Although the United States has typically been in a position to import ethanol, corn-based ethanol exports are surging as the domestic market becomes saturated and world prices rise due to high prices for sugar, the competing global feedstock. The U.S. is now the world’s leading ethanol producer but domestic demand is constrained because of technical limitations in the current vehicle fleet. Higher ethanol blends have been approved for use (15% rather than 10%) but a limited number of vehicles that can use such higher blends. Infrastructure constraints also affect the potential supply of higher ethanol blends. As a result of these factors, U.S. biofuel policies can have significant implications for the world ethanol market. Usage mandates under the...
Tipo: Conference Paper or Presentation
Palavras-chave: Ethanol Exports; Biofuel Policies; Variability; International Relations/Trade; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/115793

Decomposition of Variability in Farm Household Assets and Debt
Provedor de dados: 31
Autores: Mishra,   Ashok K.; El-Osta,   Hisham S.
Farm families often hold large quantities of wealth and, like any other family, assess their financial progress by reviewing their net worth (or wealth) position periodically. Wealth has an impact on many decisions such as production, retirement, and succession of the farm. Households, in general, seek stability growth in wealth and, ideally, income as well. In the case of wealth, farm households will be better equipped to handle variability once the contributing sources are identified. This study measures how much of the variability in farm household assets and debt is attributed to the variability in farm and nonfarm sources of assets and farm and nonfarm sources of debt. Using a normalized variance decomposition approach and data from the Agricultural...
Tipo: Journal Article
Palavras-chave: Assets; Debt; Farm households; Variability; Variance decomposition; Farm Management; Financial Economics.
Ano: 2005
URL: http://purl.umn.edu/59682

Definitions of Biodiversity and Measures of Its Value
Provedor de dados: 31
Autores: Simpson,   R. David.
The destruction of natural habitats has prompted concerns about the loss of biological diversity. Regrettably, however, there is no consensus among either biologists or economists on the most meaningful measures of biodiversity. Fundamentally different definitions are useful in asking fundamentally different questions. Considerable attention has been given to the value of diversity in search models. A measure of "aggregate variability" is appropriate to such models. Values derived from search models tend to be well behaved; they exhibit diminishing returns in diversity. In contrast, a definition of diversity as "relative abundance" is more appropriate to more complex objective functions. Values derived in these models are not necessarily well behaved. The...
Tipo: Working or Discussion Paper
Palavras-chave: Biological diversity; Biodiversity; Diversity index; Abundance; Search; Variability; Consistency; Contingent valuation; Diminishing returns; Increasing returns; Environmental Economics and Policy; D43; D83; Q20.
Ano: 2002
URL: http://purl.umn.edu/10551

Effects of Site-Specific Management on the Application of Agricultural Inputs
Provedor de dados: 31
Autores: Hennessy,   David A.; Babcock,   Bruce A.; Fiez,   Timothy E.
Site-specific management of inputs in agricultural production is receiving increasing attention because of new technologies and concerns about excessive input use. This paper provides a microeconomic analysis of its implications. It shows that profit decreases with an increase in the variability of input requirements, but that the input and production effects can be quite complicated. The effects of moving from uncertainty about input requirements to variable requirements are also identified. An empirical study of nitrogen fertilization suggests that sitespecific management may reduce input use substantially, but the production and profitability impacts may not be large.
Tipo: Working or Discussion Paper
Palavras-chave: Negative externality; Site-specific management; Uncertainty; Variability; Crop Production/Industries.
Ano: 1996
URL: http://purl.umn.edu/18521

Characterization of selection effects on broiler lines using DNA fingerprinting
Provedor de dados: 89
Autores: Schmidt,GS; Hellmeister Filho,P; Zanella,EL.
The objective of this study was to evaluate the effect of selection for body weight on the genetic variability and diversity in broiler lines. Two paternal broiler lines (LL and LLc) were used. LL line was selected for 12 generations for growth and carcass and reproduction characteristics. The LLc line was established from LL line in 1985 and mated at random. Blood samples from six chickens per line were collected and used for molecular analysis. Also, a DNA pool was made for each line to compare effects between lines. Data were analyzed considering the collected information on the presence or absence of DNA bands. Band sharing scores were calculated using the DICE coefficient. The pattern of the 21 most representative bands was used. DNA fingerprinting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body weight; Fingerprinting; Molecular markers; Variability.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000200005

Sampling strategies for tropical forest nutrient cycling studies: a case study in São Paulo, Brazil
Provedor de dados: 90
Autores: Sparovek,G.; Camargo,O. A.
The precise sampling of soil, biological or micro climatic attributes in tropical forests, which are characterized by a high diversity of species and complex spatial variability, is a difficult task. We found few basic studies to guide sampling procedures. The objective of this study was to define a sampling strategy and data analysis for some parameters frequently used in nutrient cycling studies, i. e., litter amount, total nutrient amounts in litter and its composition (Ca, Mg, Κ, &amp;#925; and P), and soil attributes at three depths (organic matter, Ρ content, cation exchange capacity and base saturation). A natural remnant forest in the West of São Paulo State (Brazil) was selected as study area and samples were collected in July, 1989. The total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Utter; Soil nutrients; Variability.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831997000400014

Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene
Provedor de dados: 92
Autores: Barbosa,Nara C. C. P.; Freitas,Sérgio de; Morales,Adriana C.
Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene. Green lacewings are generalist predators, and the species Chrysoperla externa presents a great potential for use in biological control of agricultural pests due to its high predation and reproduction capacities, as well as its easy mass rearing in the laboratory. The adaptive success of a species is related to genetic variability, so that population genetic studies are extremely important in order to maximize success of the biological control. Thus, the present study used nuclear (Inter Simple Sequence Repeat - ISSR) and mitochondrial (Cytochrome Oxidase I - COI) molecular markers to estimate the genetic variability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Green lacewings; Insecta; Population structure; Variability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262014000200012

GENETIC DIVERSITY OF PASSIFLORA ACCESSIONS BASED ON MORPHOPHYSIOLOGICAL SEED DESCRIPTORS
Provedor de dados: 94
Autores: MAROSTEGA,THALITA NEVES; ARAUJO,LOURISMAR MARTINS; LUZ,PETTERSON BAPTISTA DA; NEVES,LEONARDA GRILLO; BARELLI,MARCO ANTÔNIO APARECIDO.
ABSTRACT  The aim of this work was to estimate the genetic divergence among Passifloraaccessions based on morphophysiological seed characteristics. Accessions were distributed in a completely randomized design, with four replicates of 25 seeds. Data were submitted to analysis of variance and the means grouped by the Scott-Knott method. The genetic diversity was studied according to the Tocher and UPGMA grouping method based on the Mahalanobis distance (D2) and Canonical Variables. In the cluster analyzes, four groups were formed by the UPGMA and Canonical Variables methods. In the Tocher Optimization method, seven groups were formed. of P. eichleriana, P. suberosa, P. edulis and P. foetida accessions presented the best results for the seed characteristics...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passion fruit tree; Variability; Wild; Grouping method.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000500803

Plant biometrics of malay, rose and water apple
Provedor de dados: 94
Autores: Nacata,Guilherme; Andrade,Renata Aparecida de.
Abstract  Due to the lack of studies comparing Syzygium malaccensis(L) Meer e Perry, Syzygium aqueum Burm.f. and Syzygium jambos (L) Alston Syzygium in relation to the botanical genus Sygygium regarding the physical characteristics, the present research was conducted, aiming at biometrically characterizing each of the three species, as well as comparing them. The fruits were collected from the São Paulo State University (Unesp), School of Agricultural and Veterinarian Sciences, Jaboticabal. Syzygium plants were used for the evaluation of: fruit and seed masses (g); width and length of leaves (cm) and of seeds (cm); percentage of fruit pulp; length of leaf petiole (cm); and leaf area (cm2). Fifty fruits, leaves and seeds of each species were used, with 5...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Description; Morphological characterization; Syzygium; Variability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000600601

SELECTION VIA MIXED MODELS IN SEGREGATING GUAVA FAMILIES BASED ON YIELD AND QUALITY TRAITS
Provedor de dados: 94
Autores: QUINTAL,SILVANA SILVA RED; VIANA,ALEXANDRE PIO; CAMPOS,BIANCA MACHADO; VIVAS,MARCELO; AMARAL JÚNIOR,ANTONIO TEIXEIRA DO.
ABSTRACT  Aiming at the generation of new guava varieties with superior attributes, we conducted this study adopting the REML/BLUP procedure at individual level. Seventeen segregating guava families were evaluated in a randomized-block design with two replicates and 12 plants per plot. Families were obtained after controlled biparental pollination. The studied individuals showed high genotypic variance for fruit weight (FW), total yield (YLD), and ascorbic acid content (AAC). The heritability coefficients of the mean of progenies led to high progeny-selection accuracy for pulp yield (PY), soluble solids content (SSC), in addition to FW, YLD, and AAC; moderate accuracy for fruit acidity (FA) and SSC/FA ratio; and low accuracy for mesocarp thickness (MT) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Psidium guajava; Variability; REML/BLUP.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000200802

Individual responses of growing pigs to threonine intake
Provedor de dados: 96
Autores: Isola,Renan Di Giovanni; Hauschild,Luciano; Perondi,Dani; Andretta,Ines; Gobi,Jaqueline de Paula; Remus,Aline; Veira,Alini Mari.
ABSTRACT A nitrogen balance test was performed to evaluate the individual responses of growing pigs to threonine intake. Eight commercial barrows were used (body weight ranging from 15 to 20 kg). A dose-response study was performed, in which the threonine supply increased in seven equidistant steps (the seven dietary threonine levels ranged from 50 to 120% of the requirements) every three days for each pig. The levels of all other amino acids were 20% higher than the tested amino acid. Nitrogen retention as a function of threonine intake was calculated per individual and per group (NLIN and NLMixed, respectively) using a linear plateau model. The highest break point value was 42.42 g of threonine intake (the most demanding individual), whereas the lowest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amino acids; Individuals; Nitrogen retention; Requirements; Variability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100500

Molecular characterization of GSyV-1 and GLRaV-3 and prevalence of grapevine viruses in a grape-growing area
Provedor de dados: 63
Autores: Moura,Cátia Jacira Martins de; Fajardo,Thor Vinícius Martins; Eiras,Marcelo; Silva,Fábio Nascimento da; Nickel,Osmar.
ABSTRACT: The aims of this study were to determine the prevalence of viruses in 119 samples from 32 grapevine cultivars, collected from nine vineyards in a specific grape-growing area in southeastern Brazil, perform a partial molecular characterization of 14 isolates of Grapevine Syrah virus 1 (GSyV-1) and Grapevine leafroll-associated virus 3 (GLRaV-3) and assess the coat protein genetic variability of these viruses. The detection of viruses was implemented by real-time RT-PCR (reverse transcription polymerase chain reaction) aiming to detect seven viruses and one viroid. With the exception of the Grapevine Cabernet Sauvignon reovirus (GCSV), the viruses and viroid that were evaluated were widespread in the sampled areas, often in high prevalence and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis; Diagnosis; Variability; Incidence; Leafroll.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100043

Phenology and morphological diversity of sweet potato (Ipomoea batatas) landraces of the Vale do Ribeira
Provedor de dados: 63
Autores: Veasey,Elizabeth Ann; Silva,Jurema Rosa de Queiroz; Rosa,Mariana Silva; Borges,Aline; Bressan,Eduardo de Andrade; Peroni,Nivaldo.
The phenotypic diversity of sweet potato (Ipomoea batatas) landraces was assessed using morphological traits, verifying how this diversity is distributed among the households and settlements of the Vale do Ribeira, Brazil. A total of 74 accessions, involving 53 landraces, collected from 30 households distributed among 18 settlements that practice traditional agriculture in the municipalities of Iguape, Ilha Comprida, and Cananeia, as well as four commercial varieties acquired in markets of Iguape and Piracicaba, were evaluated under an ex situ experimental condition in Piracicaba, SP, Brazil. Nine phenological and floral descriptors, nine morphological vegetative aerial descriptors and five storage root traits were recorded. The 14 aerial vegetative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Local varieties; Morphology; Phenotypic diversity; Traditional agriculture; Variability.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400013

Polyphasic analysis of Acidovorax citrulli strains from northeastern Brazil
Provedor de dados: 63
Autores: Silva,Kirley Michele Marques; Xavier,André Silva; Gama,Marco Aurélio Siqueira; Lima,Nelson Bernardi; Lyra,Maria do Carmo Castanho Pereira; Mariano,Rosa Lima Ramos; Souza,Elineide Barbosa.
ABSTRACT Bacterial fruit blotch (BFB) of cucurbit plants is caused by Acidovorax citrulli and represents a serious concern to melon (Cucumis melo L.) growers worldwide, including those in Brazil. Thirty-four A. citrulli strains from different melon production areas of northeastern Brazil were characterized for their virulence on melon fruits and their substrate utilization and molecular profiles. Based on the analysis of BFB severity on melon fruits, the A. citrulli strains were divided into three groups, classified as mildly, moderately or highly virulent. Although host-related groups were not observed, the watermelon and ‘melão-pepino’ strains exhibited only low or moderate virulence on melon fruit. Substrate utilization profiles revealed that 94 % of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis melo; Bacterial fruit blotch; Variability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000300252

Somaclonal variation in micropropagated Heliconia bihai cv. Lobster Claw I plantlets (Heliconiaceae)
Provedor de dados: 63
Autores: Rodrigues,Paulo Hercílio Viegas.
The occurrence of somaclonal variation is described in various cultures of agronomic interest. Such variation can be of benefit in the development of new flower varieties. In this study, the occurrence of somaclonal variation in micropropagated changes of Heliconia bihai cv. Lobster Claw I was investigated. Stem apexes were introduced in MS culture media with the addition of 2.5 mg L-1 of benzylaminopure (BAP) and 500 mg L-1 of sodium cefotaxime. After selecting the apex stem, it was sub-cultivated in MS media and supplemented with 4.0 mg L-1 of BAP to induce side buds. To conduct the trial, 2,000 plants were selected and compared with plants originated from rhizomes. To calculate the percentage of the variants, the plant stature, the form and color of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Tissue culture; Flower growing; Variability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600017

More adequate probability distributions to represent the saturated soil hydraulic conductivity
Provedor de dados: 63
Autores: Mesquita,Maria da Glória Bastos de Freitas; Moraes,Sérgio Oliveira; Corrente,José Eduardo.
The saturated soil hydraulic conductivity (Ksat) is one of the most relevant variables in studies of water and solute movement in the soil. Its determination in the laboratory and in the field yields high dispersion results, which could be an indication that this variable has a no symmetrical distribution. Adjustment of the normal, lognormal, gamma and beta distributions were examined in order to search for a probability were density function that would more adequately describe the distribution of this variable. The experiment consisted in determining the saturated hydraulic conductivity, through the constant head permeameter method, in undisturbed samples of three soils of different textures from the central western region of the São Paulo State, Brazil,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water movement; Variability; Probability functions.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000400025

Genetic structure analysis of Mauritia flexuosa natural population from the Lençóis Maranhenses region using microsatellite markers
Provedor de dados: 63
Autores: Castro,Domingos Augusto Mendonça; Costa,Tatiana Santos; Cardoso,Ariane Santos; Ramos,Helaine Christine Cancela; López,Jorge Alberto; Diniz,Leandro Eugenio Cardamone.
ABSTRACT Buriti (Mauritia flexuosa L.f), a palm tree native to South America and widely distributed in Brazil, displays significant ecological, economic and biotechnological importance. However, the disorderly extractivism and environmental degradation of its endemic areas are leading to reductions in, and/or extinction of the buriti palm tree, causing ecological imbalance with significant economic losses for rural communities and genetic diversity. Consequently, populational genetic diversity studies have become relevant as a strategy for conserving the species. Therefore, this study evaluated the genetic structure of 10 populations from the Lençóis Maranhenses region, in the state of Maranhão, Brazil, using microsatellite markers. Results indicated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buriti; SSR; Preservation; Diversity; Variability.
Ano: 2022
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000101101

Cold tolerance at the germination stage of rice: methods of evaluation and characterization of genotypes
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe.
Rice cold tolerance at the germination stage is important in Rio Grande do Sul (RS) where temperatures below 15°C prevent or reduce germination and plant establishment in early sowings. The present study aimed at identifying an adequate method for cold tolerance evaluation of the rice germination stage and at verifying the variability among 24 rice genotypes of different origins. Cold tolerance was evaluated in experiment I, germination under two conditions: 13°C for 28 days and 28°C for seven days, and in experiment II, germination under 28°C for 72 hours, 13°C for 96 hours and again 28°C for 72 hours. In experiment I measured characteristics were germination index, percentage of seeds with coleoptile length superior to 5 mm and percentage of reduction in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Low temperature; Variability; Indica and Japonica subspecies.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100001

Daily rainfall variability at a local scale (1,000 ha), in Piracicaba, SP, Brazil, and its implications on soil water recharge
Provedor de dados: 63
Autores: Reichardt,K.; Angelocci,L.R.; Bacchi,O.O.S.; Pilotto,J.E.
Daily rainfall variability at a local scale (1,000 ha) was studied at Piracicaba, SP, Brazil, for the period of one year (1993-1994), in order to better understand the process of soil water recharge. Coefficients of variation of daily data for ten observation points varied from 2.2 to 169.3% and the variability was independent of rain type, i.e. whether convective, frontal or of other origin. Data were not related to separation distances between observation points and it is concluded that one observation point does not represent areas as far as 1,000 to 2,500 m apart, for daily, monthly or even quarterly averages. Yearly totals for the ten observation points presented a coefficient of variation as low as 3.06%, indicating that all points can replace each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Rainfall; Soil water recharge.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000100008

Reaction of sources of resistance to white mold to microsatellite haplotypes of Sclerotinia sclerotiorum
Provedor de dados: 63
Autores: Lehner,Miller da Silva; Paula Júnior,Trazilbo José de; Vieira,Rogério Faria; Lima,Renan Cardoso; Soares,Bruno de Almeida; Silva,Rhaphael Alves.
ABSTRACT White mold caused by the fungus Sclerotinia sclerotiorum is the most yield-limiting disease of common bean in Brazil. To date, there has been no commercial cultivar resistant to this disease. In a greenhouse we evaluated white mold resistance sources (Cornell 605, A195 and G122) against eight isolates of S. sclerotiorum from five Brazilian states. A Brazilian cultivar (BRSMG Madrepérola) and a susceptible check (Beryl) were used as control. Treatments were arranged in factorial combinations (5 × 8) in a completely random design with four replicates. Disease severity was assessed on a rating scale of 1-to-9 together with lesion length, which was used to determine an area under the disease progress curve (AUDPC). Polymorphisms detected in ten...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Common bean; Crop breeding; Variability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000200184

Molecular fingerprinting of Fusarium oxysporum f. sp. passiflorae isolates using AFLP markers
Provedor de dados: 63
Autores: Silva,Aline dos Santos; Oliveira,Eder Jorge de; Haddad,Fernando; Jesus,Onildo Nunes de; Oliveira,Saulo Alves Santos de; Costa,Maria Angélica Pereira de Carvalho.
Fusarium oxysporum f. sp. passiflorae W.L. Gordon (FOP) is one of the most important fungal pathogens of passion fruits. Understanding molecular variation of isolates from different areas is of utmost importance. Molecular fingerprinting on 14 isolates of FOP were conducted using AFLP molecular markers (Amplified Fragment Length Polymorphism), and their genetic variability were estimated. Twenty-five AFLP primer combinations were selected for amplification of FOP isolates and one for Fusarium oxysporum f. sp. cubense W.C. Snyder &amp;amp; H.N. Hansen (FOC), resulting in 99% polymorphic fragments, with an average of 40 fragments per primer combination. Specific fingerprints could be generated for most of the isolates evaluated; we observed a high power of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passion fruit; Fusarium wilt; Fingerprint; Variability; Molecular marker.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200008

Genetic divergence among and within Colletotrichum lindemuthianum races assessed by RAPD
Provedor de dados: 102
Autores: Talamini,Viviane; Souza,Elaine A.; Pozza,Edson A.; Silva,Gilvan F.; Ishikawa,Francine H.; Camargo Júnior,Osnil A.
Genetic divergence within and among races of Colletotrichum lindemuthianum was determined using RAPD markers. In addition to the different races of the fungus three isolates of the sexual stage of Colletotrichum lindemuthianum (Glomerella cingulata f.sp. phaseoli) were included in this study. The band patterns generated using 11 primers produced 133 polymorphic bands. The polymorphic bands were used to determine genetic divergence among and within the pathogen races. The isolates analyzed were divided into six groups with 0.75 relative similarity. Group VI, formed by three isolates of the sexual phase of Colletotrichum lindemuthianum, was the most divergent. Races previously determined using differential cultivars did not correlate with the results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Common bean; DNA; Molecular characterization; Variability.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000600002

Assessment of 112 tomato (Solanum lycopersicum L.) cultivars for industrial processing in Portoviejo, Ecuador
Provedor de dados: 109
Autores: Cañadas-López,Álvaro Gustavo; Rade-Loor,Diana Yasbhet; Quijije-Pinargote,Raúl Ovidio; Sotomayor,Ignacio Antonio; Ormaza-Molina,Alexandra Maricela.
Abstract Tomato (Solanum lycopersicum L.) processing industry requires varieties with increased production and quality, and also with resistance to pest, in order for producers to cultivate these. The aim of this study was to carry out an evaluation of 112 tomato cultivars for production and quality characteristics from the following providers: Orsetti Seed, Heiz Seed, Ohio University, United Genetic and Harrys Moran. The experiment was conducted at the Experimental Research Station Portoviejo of INIAP. Statistical analyses used were principal components analysis for a group of112 cultivars based on production parameter: yield (t.ha-1), average fruit weight (g), number of fruits per plant, defective fruits per plant; in addition to quality parameters as:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Production; Quality; Paste; Food processing; Breeding program.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000200347

Characterization of lulo ( Solanum quitoense Lam.) genetic diversity in the department of Boyaca, Colombia
Provedor de dados: 109
Autores: Morillo-Coronado,Ana Cruz; Tovar-León,Yeily Paola; Morillo-Coronado,Yacenia.
Abstract Lulo (Solanum quitoense Lam.) is an exotic fruit with major economic importance in the Andean region. It has gained importance in the agricultural sector due to organoleptic and cultivation characteristics. There are not studies on this plant genetic resource in the province of Neira, Boyaca department, Colombia. Given these concerns, the aim of this research was to characterize the genetic diversity with random amplified microsatellite markers (RAM). Twenty-one S. quitoense materials were collected in the Soaquira and Sacaneca, Boyaca-Colombia districts to calculate genetic diversity and similarity indices. In addition, the analysis with the Nei-Li coefficient formed three groups at 0.60 similarity level showing a loose distribution of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andean fruit; RAM microsatellites; Solanum; Variability.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000300430

MOLECULAR VARIABILITY OF THREE GENES OF POTATO VEIN YELLOW VIRUS INFECTING Solanum tuberosum, USING SINGLE STRAND CONFORMATIONAL POLYMORPHISM
Provedor de dados: 37
Autores: CUBILLOS-ABELLO,Karen Andrea; GUZMÁN BARNEY,María Mónica.
Potato yellow vein virus (PYVV), a virus with tripartite RNA (ss+) genome is classified as member of the genus Crinivirus within the family Closteoviridae. PYVV is the causal agent of potato yellow vein disease (PYVD) with yield loss between 25 %-50 % in field. Single strand conformational polymorphism (SSCP) has been reported to estimate variability in different viruses' species. In this study, the molecular variability of PYVV analyzed by SSCP patterns of three genes: major capsid protein (CP), minor capsid protein (CPm), and heat shock protein (Hsp70) obtained from 60 virus isolates from potato plants expressing PYVD. Leaves collected in Nariño, Colombia from 30 Solanum tuberosum Phureja Group (PhG) and 30 from the Andigena Group (AG). Genes amplified...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Closteroviridae; Potato; Variability; Viral proteins.
Ano: 2015
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2015000100026

Fruit biometry and seed germination of Syagrus romanzoffiana (Cham.) Glassm
Provedor de dados: 39
Autores: Goudel,Flora; Shibata,Marília; Coelho,Cileide Maria Medeiros; Miller,Paul Richard Momsen.
Syagrus romanzoffiana (Cham.) Glassm. is a species native to Brazil that is of ecological and aesthetic importance. This study aims to describe the biometric characteristics of S. romanzoffiana fruits and to assess the effects that treatments meant to overcome dormancy and partial drying have on seed germination. For biometric characterization, each repetition consisted of 50 fruits from eight clusters (total, 400 fruits). To evaluate methods for overcoming dormancy, seeds representative of populations were treated by perforation of the operculum; perforation of the operculum and immersion in water for 24 hours; cracking; exposure to fire for three minutes; and non-removal of fibers. There was also a control group. In a second experiment, seeds were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dormancy; Syagrus romanzoffiana; Palm; Drying; Variability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100015

Caracterização estatística de variáveis usadas para ensaiar uma semeadora-adubadora em semeadura direta e convencional - DOI: 10.4025/actasciagron.v31i4.951
Provedor de dados: 1
Autores: Vale, Welington Gonzaga do; UENF; Garcia, Ricardo Ferreira; UENF; Thiebaut, Jose Tarcísio Lima; UENF; Gravina, Geraldo de Amaral; UENF.
O objetivo deste trabalho foi caracterizar, estatisticamente, as variáveis patinagem dos rodados,  espaço percorrido por parcela, área da parcela trabalhada, capacidade de campo teórica e efetiva de uma semeadora em sistema de semeadura direta (SD) e convencional (SC), com base na verificação do ajuste de uma série de dados a uma distribuição estatística, visando indicar a melhor forma de representação e valores a serem adotados para que estas variáveis sejam utilizadas em operações de práticas agrícolas. O experimento na SC foi realizado com velocidade de 1,5 m s-1, com 190 repetições, durante a semeadura de milho em solo classificado como Cambissolo; o experimento na SD, com 1,8 m s-1 e 58 repetições, durante a semeadura de sorgo em solo classificado...
Palavras-chave: 5.03.00.00-8    Engenharia Agrícola mecanização agrícola; Variabilidade; Número de amostras Mecanização agrícola agricultural mechanization; Variability; Number of samples.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/951

Population structure and impact of recurrent selection on popcorn using EST-SSR markers
Provedor de dados: 1
Autores: Guimarães, Amanda Gonçalves; Amaral Júnior, Antônio Teixeira do; Almeida Filho, Janeo Eustáquio de; Pena, Guilherme Ferreira; Vittorazzi, Cássio; Pereira, Messias Gonzaga.
The success of any recurrent selection program depends on the genetic variability of the evaluated population, which is used to refer to the diversity of existing alleles at many genetic loci. Thus, the goal of the present study was to investigate the impact of recurrent selection across nine cycles of a UENF-14 popcorn population through the analysis of genetic diversity and structure using microsatellite markers (EST-SSRs). Genomic DNA was extracted from young leaves of 25 individuals from each cycle (C0, C1 C2, C3, C4, C5, C6, C7, and C8), totaling 225 samples from the UENF-14 population. Fifty EST-SSR markers were used for the analysis of genetic diversity across the recurrent selection cycles, 16 of which were polymorphic. Thirty-four alleles were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays L. var. Everta; Variability; Microsatellite markers; Heterozygosity; Equilibrium.; Melhoramento Vegetal.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35218

Population structure and impact of recurrent selection on popcorn using EST-SSR markers
Provedor de dados: 1
Autores: Guimarães, Amanda Gonçalves; Amaral Júnior, Antônio Teixeira do; Almeida Filho, Janeo Eustáquio de; Pena, Guilherme Ferreira; Vittorazzi, Cássio; Pereira, Messias Gonzaga.
The success of any recurrent selection program depends on the genetic variability of the evaluated population, which is used to refer to the diversity of existing alleles at many genetic loci. Thus, the goal of the present study was to investigate the impact of recurrent selection across nine cycles of a UENF-14 popcorn population through the analysis of genetic diversity and structure using microsatellite markers (EST-SSRs). Genomic DNA was extracted from young leaves of 25 individuals from each cycle (C0, C1 C2, C3, C4, C5, C6, C7, and C8), totaling 225 samples from the UENF-14 population. Fifty EST-SSR markers were used for the analysis of genetic diversity across the recurrent selection cycles, 16 of which were polymorphic. Thirty-four alleles were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.03.05-9; 2.08.04.00-8 Zea mays L. var. Everta; Variability; Microsatellite markers; Heterozygosity; Equilibrium. Melhoramento Vegetal.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/35218

Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands of the tropical southwestern Atlantic
Provedor de dados: 42
Autores: SOUZA,CHRISTIANE S. DE; LUZ,JOANA A.G.; MAFALDA JUNIOR,PAULO O.
Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands off Northeastern Brazil were analyzed from 133 oceanographic stations during the months of January – April of 1997 and April – July of 1998. Oblique zooplankton tows, using 50 cm diameter Bongo nets with 500µm mesh with a flowmeter to determine the filtered volume, were carried out to a maximum of 200m depth. The Superficial Equatorial Water, which had a salinity &gt; 36 PSU and temperature &gt; 20°C, occupied the top 80 to 200m depth. Below this water mass was the South Atlantic Central Water with salinity ranging from 34.5 to 36 PSU and temperature from 6 to 20°C. The community of chaetognaths showed six species: Pterosagitta draco,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Northeastern Brazil; Seamounts; Spatial distribution; Variability; Zooplankton.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301151

Plot size and number of replications to evaluate the grain yield in oat cultivars
Provedor de dados: 53
Autores: Lavezo,André; Cargnelutti Filho,Alberto; Bem,Cláudia Marques de; Burin,Cláudia; Kleinpaul,Jéssica Andiara; Pezzini,Rafael Vieira.
ABSTRACT The objectives of this study were to determine the optimum plot size (Xo) and the number of replications to evaluate grain yield and verify the variability of Xo among oat cultivars. Thirtytwo uniformity trials of 3 × 3 m were performed, being 8 from each cultivar (URS Charrua, URS Taura, URS Estampa, and URS Corona). Each uniformity trial was divided in 36 basic experimental units (BEU) of 0.5 × 0.5 m. Grain yield was determined in each BEU. The Xo was determined by the method of maximum curvature of the coefficient of variation model. Mean comparisons among cultivars were performed by the Scott-Knott test via bootstrap. The number of replications was calculated by an iterative process until convergence for experiments in completely randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa L.; Variability; Uniformity trial; Experimental design.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400512

Identification of variability for agronomically important traits in rice mutant families
Provedor de dados: 53
Autores: Luz,Viviane Kopp da; Silveira,Solange Ferreira da Silveira; Fonseca,Gabriela Magalhães da; Groli,Eder Licieri; Figueiredo,Ricardo Garcia; Baretta,Diego; Kopp,Mauricio Marini; Magalhães Junior,Ariano Martins de; Maia,Luciano Carlos da; Oliveira,Antonio Costa de.
ABSTRACT The increase of yield potential in new rice (Oryza sativa L.) varieties has been a major challenge for genetic improvement. The generation of mutants, followed by their characterization, constitutes a great possibility to isolate and select genes and genotypes that present agronomic traits of interest. This study aimed to evaluate the effect of chemical mutagen ethyl methane sulphonate (EMS) on agronomic traits in 340 M3 families of rice derived from BRS Querência cultivar. Seeds from each family and the original genotype BRS Querência were sown in the experimental field, and the characters main panicle length, main panicle weight, main panicle grain weight, flag leaf width and plant height were evaluated. Data were subjected to analysis of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Ethyl methane sulphonate; Mutagenic; Variability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100041

Early selection of elite plants in Asparagus
Provedor de dados: 53
Autores: COINTRY,ENRIQUE LUIS; LÓPEZ ANIDO,FERNANDO SEBASTIÁN; GATTI,ILEANA; CRAVERO,VANINA PAMELA; FIRPO,INÉS TERESA; GARCÍA,STELLA MARIS.
In order to establish an efficient selection criterion the variability in three asparagus populations was evaluated defining the most important yield components and analysing its evolution along three growing seasons. The yield components, coefficient of variation (CV) and the proportion of plants contributing to 80% of the total yield were estimated. The elite plants were selected by mean of total yield and clusters techniques. Multiple regression showed that spear number (SN) and spear weight (SW) were the most important yield components. In every population, total yield (TY) and SN showed the highest values of CV, independently of sex. 69% of the plants contributed to the 80% of the total yield in the first year while in the second and third year the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asparagus; Variability; Elite plants; Selection; Plant breeding.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052000000100005

Variability of Vernier acuity measurements in untrained subjects of different ages
Provedor de dados: 56
Autores: Abbud,C.M.M.; Cruz,A.A.V.
The Vernier acuity of 50 normal untrained subjects (20 males and 30 females) was measured by the method of adjustment. Subjects were divided into five age ranges with 10 subjects in each age group: 5-10, 11-20, 21-30, 31-40, and 41-50 years. All subjects had normal visual acuity (20/20) and volunteered to participate in the experiment. Children were selected from a local school and adults recruited from the technical staff of the Department of Ophthalmology of the School of Medicine. Vernier acuity was higher in adults compared to children. Intraindividual variability was high and it was estimated that for most individuals of all age groups a range of 100 to 700 trials was necessary to obtain a mean with a precision of 10%. These results suggest that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vernier acuity; Variability; Age.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000200011

Comparison of the variability of the onset and recovery from neuromuscular blockade with cisatracurium versus rocuronium in elderly patients under total intravenous anesthesia
Provedor de dados: 56
Autores: Xiaobo,Feng; Jianjuan,Ke; Yanlin,Wang.
This study was designed to compare the variability of the onset and offset of the effect of two neuromuscular blocking drugs with different elimination pathways in adult and elderly patients during total intravenous anesthesia (TIVA). After Ethics Committee approval and patients’ informed consent, the drugs were compared in 40 adult and 40 elderly patients scheduled for elective surgery under TIVA with tracheal intubation who were randomized to receive a single bolus dose of 0.15 mg/kg cisatracurium or 0.9 mg/kg rocuronium. The time of onset of maximum depression, duration of action, and recovery index time were measured and recorded for each patient and variability is reported as means ± standard deviation. Time of onset was significantly shorter for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neuromuscular relaxant; Rocuronium; Cisatracurium; Variability; Elderly.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000700016

Forage characters of different Paspalum species in Rio Grande do Sul: a meta-analysis
Provedor de dados: 65
Autores: Graminho,Larissa Arnhold; Dall’Agnol,Miguel; Pötter,Luciana; Lopes,Rodrigo Ramos; Simioni,Carine; Weiler,Roberto Luís.
ABSTRACT: The objective of this study was to evaluate, through meta-analysis, the forage characteristics of various species of the genus Paspalum and to use them to select the best ecotypes that can be used in artificial hybridization as parents and hybrids for pasture production and natural pasture recovery systems. Data were obtained from studies conducted by the Department of Forage Plants and Agrometeorology of the Universidade Federal do Rio Grande do Sul. Database comprised tests conducted with ecotypes and/or hybrids of Paspalum spp. in plots for evaluating total dry mass production, leaf dry mass production, and stem dry mass production by means of cuts. Total dry mass production, which included leaves and stems, differed between the ecotypes and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apomixis; Hybridization; Plant breeding; Natural pasture; Variability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000700651

Classification of the coefficient of variation to variables in beef cattle experiments
Provedor de dados: 65
Autores: Vaz,Marcos André Braz; Pacheco,Paulo Santana; Seidel,Enio Júnior; Ansuj,Angela Pellegrin.
ABSTRACT: This research was conducted to propose a classification of the coefficient of variation (CV%) in many categories of variables of production and carcass of beef cattle experiments. The data was collected from theses and dissertations. We used the methods of classification considering mean and standard deviation, and considering median and pseudo-sigma. The two methods showed similar results so both can be used to classify CV%. We propose only three categories to rank CV%: low, medium and high.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal science; Animal experimentation; Variability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001100651

Characterization of trees, fruits and genetic diversity in natural populations of mangaba
Provedor de dados: 64
Autores: Silva,Ana Veruska Cruz da; Amorim,Julie Anne Espíndola; Vitória,Marina Ferreira da; Ledo,Ana da Silva; Rabbani,Allivia Rouse Carregosa.
ABSTRACT The state of Sergipe is the largest mangaba producer, which is a fruit native to Brazil, and has cultural, social and economic importance in its area of occurrence. It is an endangered species due to human actions, and despite its economic potential, there are still no commercial plantations. The study was carried out in order to characterize trees, fruits and the genetic diversity of natural populations of mangaba in Sergipe, Brazil. Fruits from Abaís Beach/Estância (AB) presented, on average, twice the vitamin C content (414.81 mg of vit. C/100g), when compared with the others. The use of ISSR primers was efficient in estimating the genetic similarity of populations. The primers clustered the populations of mangaba according to their origin,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hancornia speciosa Gomes; Postharvest; Molecular markers; Variability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000300255