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Aires marines protégées et récifs artificiels : méthodes d'évaluation, protocoles expérimentaux et indicateurs ArchiMer
Claudet, Joachim.
Marine Protected Areas' (MPAs) and Artificial Reef's (ARs) management requires complex assessment and monitoring programmes, dealing with different sources of variability. We studied and developed experimental designs and analysis methods suited for the establishment of a monitoring of MPAs and ARs. This methodology is developed from existing data sets in the Northwestern Mediterranean. We build multi-criteria indicators allowing a statistically testable diagnosis of the impact of MPAs and ARs on reef fish assemblages. Using ecological performance indicators permits to monitor and to give an image of the assessed system to managers. It was possible to show the global response of the fish assemblages to the protection by a MPA. This response was evidenced...
Tipo: Text Palavras-chave: Management; Northwestern Mediterranean; Statistical Power; Monitoring; Habitat; Multivariate; Indicators; Temperate Fish; Impact Assessment; Artificial Reefs; Marines Protected Areas; Gestion; Méditerranée Nord Occidentale; Puissance Statistique; Suivis; Habitat; Multivarié; Indicateurs; Poissons Tempérés; Evaluation d'Impact; Récifs Artificiels; Aires Marines Protégées.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2132.pdf
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Análise de componentes principais em caracteres morfológicos de café arábica em estádio juvenil. Repositório Alice
TEIXEIRA, A. L.; GONÇALVES, F. M. A.; REZENDE, J. C. de; ROCHA, R. B.; PEREIRA, A. A..
Objetivou-se, no presente estudo, identificar quais são os caracteres morfológicos de maior importância na discriminação entre genótipos juvenis de Coffea arabica.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Seleção precoce; Multivariada; Melhoramento do cafeeiro; Early selection; Multivariate; Coffee breeding.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/974940
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Climate change adaptation strategies of maize producers of the Central Rift Valley of Ethiopia JARTS
Ahmed, Musa Hasen.
The impacts of climate change are considered to be strong in countries located in tropical Africa that depend on agriculture for their food, income and livelihood. Therefore, a better understanding of the local dimensions of adaptation strategies is essential to develop appropriate measures that will mitigate adverse consequences. Hence, this study was conducted to identify the most commonly used adaptation strategies that farm households practice among a set of options to withstand the effects of climate change and to identify factors that affect the choice of climate change adaptation strategies in the Central Rift Valley of Ethiopia. To address this objective, Multivariate Probit model was used. The results of the model indicated that the likelihood of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultultural economics climate change; Adaptation strategies; Multivariate; Maize; Ethiopia.
Ano: 2016 URL: http://www.jarts.info/index.php/jarts/article/view/2016050350187
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Cluster evaluation of Brazilian and Moroccan goat populations using physical measurements R. Bras. Zootec.
Pires,Luanna Chácara; Machado,Théa Mírian Medeiros; Araújo,Adriana Mello de; Silva,João Batista Lopes da; Euclydes,Ricardo Frederico; Costa,Márcio da Silva; Olson,Timothy Aanen.
The aim of this study was to compare the genetic diversity of 12 populations of goats in Brazil and Morocco (n = 796) through the use of physical measurements and different multivariate techniques. Traits measured included wither height (WH), distance from the brisket to the ground (BH) and ear length (EL). The standardized Euclidean distance (D) was adopted. The D values were submitted to clustering analysis using hierarchical methods (from nearest neighbor and UPGMA - Unweighted Pair Group Method with Arithmetic Mean) and the numbers of clusters were analyzed using the Tocher optimization method. The population clustering was different depending on the method of analysis used. Among the hierarchical methods, UPGMA showed the best fit (CCC = 0.82). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biometry; Divergence genetic; Genetic resources; Multivariate; Zoometric indexes.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001000004
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Comparison of projection of distance techniques for genetic diversity studies Agronomy
Sant'Anna, Isabela de Castro; Silva, Gabi Nunes; Carneiro, Vinicius Quintão; Pontes, Daiana Salles; Nascimento, Moyses; Cruz, Cosme Damião.
The objective of this study was to compare different graphical dispersion analysis techniques in two- or three-dimensional planes. In this study, the data from different published works were used in order to determine the best methodology for analyzing the genetic diversity of different species. In this study, efficiency is measured by the amount of original distance absorbed by the projection of distances technique, which in the case of major components is equal to the amount of total variation originally available and retained by the principal components used for dispersion purposes. The projection of dissimilarity measurement technique, principal component analysis (PCA), and principal coordinate analysis (PCoA) were used. Considering the analysis by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adaptive methods; Dissimilarity; Multivariate; Crops; Statistical..
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42483
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Genetic divergence among castor bean lines and parental strains using ward’s method based on morpho-agronomic descriptors Agronomy
Silva, Adielle Rodrigues da; Silva, Simone Alves; Santos, Laurenice Araújo; Souza, Deoclides Ricardo de; Araújo, Gilmara de Melo; Moreira, Ricardo Franco Cunha.
This study sought to evaluate the genetic divergence among castor lines and parental strains in the germplasm bank at the Federal University of Recôncavo da Bahia (Universidade Federal do Recôncavo da Bahia) using morpho-agronomic descriptors. This experiment was conducted from 2014 to 2015 with 208 treatments represented by bank accessions that were analyzed using a randomized block design, which established homogeneity of the experimental conditions with all treatments repeated in four blocks. The genetic divergence analysis was performed using Ward’s method and Tocher’s method based on Gower’s distance, which are two clustering methods used in studies with castor beans, with the help of the statistical programs R and GENES. The results revealed the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ciências Agrárias Ricinus communis L.; Multivariate; Variability Melhoramento Genético de Plantas.
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/32504
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Growth, production and yield of common bean under water replacement levels AGRIAMBI
Magalhães,Ivomberg D.; Lyra,Guilherme B.; Souza,José L. de; Lyra,Gustavo B.; Ferraz,Rener L. de S.; Cavalcante Júnior,Constantino A..
ABSTRACT The bean is a world-class crop and requires adequate water management for higher yield. The objective of this study was to evaluate the growth and the production and to fit multiple regression models to estimate the production components, total biomass accumulation and grain yield of ‘Rosinha’ bean under levels of replacement of evapotranspired water. The experimental design was randomized blocks with four repetitions. Treatments consisted of fractions of crop evapotranspiration (25, 50, 75, 100, 125 and 150% ETc). Growth variables (plant height, number of leaves, leaf area per plant, leaf area index, stem dry mass and leaf dry mass) and production components (number of pods per plant, pod length, pod diameter, pod dry mass, total biomass, pod...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phaseolus vulgaris; Irrigation; Multivariate.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001000754
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Long-term variability of the Abra alba community in the southern bight of the North Sea ArchiMer
Carpenter, P; Dewarumez, Jm; Lepretre, A.
The Abra alba community from the Gravelines area has been studied since 1976. During this period, sudden and unpredictable variations of the species composition have been observed. These important changes affect a limited number of species without changing the bionomical structure of the community. The species in question are found to be characteristic of this community, and are the more abundant ones. Multivariate statistical methods were used to study quantitative data on the benthic population collected from 1978 to 1992. This analysis was performed in association with air temperature data. Results showed the existence of a six- or seven-year cycle, and this is confirmed by the observation of two complete periods. This cycle, which is found to be...
Tipo: Text Palavras-chave: Long-term trends; Time series; Multivariate; Methods; Benthos.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20398/18065.pdf
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Multivariate phenetic divergence in paspalum germplam. Repositório Alice
REGITANO N.O.A.; BATISTA, L.A.R..
2000
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Multivariate; Paspalum; Germoplasm.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/45291
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Quality Risk and Profitability in Cattle Production: A Multivariate Approach AgEcon
Belasco, Eric J.; Schroeder, Ted C.; Goodwin, Barry K..
This study evaluates quality, production, and price risk within the context of overall profit variability in fed cattle production. The approach used offers a flexible way to estimate a large system of equations with more than three jointly related censored outcomes. Trade-offs between quality and yield grade levels and production measures, such as average daily gain and feeding efficiency, are evaluated. Simulation procedures are used to assess the impact of quality risk on overall profit variability. Results make an important contribution to existing research by explaining why price signals through grid quality grade premiums may not generate intended producer responses.
Tipo: Journal Article Palavras-chave: Censoring; Copula; Fed cattle; Grid pricing; Multivariate; Quality risk; Livestock Production/Industries.
Ano: 2010 URL: http://purl.umn.edu/97854
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Silversides in South Brazil: Morphological and ecological aspects Biocell
Bemvenuti,M. A..
Tipo: Info:eu-repo/semantics/article Palavras-chave: Silversides; Odontesthes; Brazil; Morphology; Multivariate.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000100013
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Smallholder Adoption of Soil and Water Conservation Practices in Northern Ghana AgEcon
Nkegbe, Paul K.; Shankar, Bhavani; Ceddia, M. Graziano.
Both governmental and non-governmental organizations are engaged in the promotion of soil and water conservation practices in northern Ghana, but adoption is believed to be low. This study thus examines the determinants of conservation practices by farming households in the area. Data for the study was collected from 445 households located in 15 communities in northern Ghana. Univariate, bivariate and multivariate probit models were used to analyse the decision to adopt six conservation practices in the area. Results show the major determinants of adoption are plot and cropping characteristics such as location; and socio-economic and institutional variables such as number of contacts with extension officers, membership in farmer association and distance to...
Tipo: Conference Paper or Presentation Palavras-chave: Conservation practice; Multivariate; Selectivity bias; Ghana; Resource /Energy Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/114608
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Statistical methods to study adaptability and stability in breeding lines of food-type soybeans Bragantia
Freiria,Gustavo Henrique; Gonçalves,Leandro Simões Azeredo; Furlan,Felipe Favoretto; Fonseca Junior,Nelson da Silva; Lima,Wilmar Ferreira; Prete,Cássio Egidio Cavenaghi.
ABSTRACT The grains of food-type soybean cultivars, which are characterized by the absence of lipoxygenases and the presence of high levels of proteins and isoflavones, are regarded as functional foods with high acceptance by consumers. However, few cultivars of food-type soybeans are currently available in the Brazilian market. The aim of this work was to study the adaptability and stability of various genotypes of food-type soybeans and to compare the performance of methods, which are based on analysis of variance, non-parametric, regression, multivariate and mixed models. Ten lines of food-type soybeans obtained from the Breeding Program of Soybeans for Human Consumption of the State University of Londrina (UEL/BPSHC) and two commercial varieties, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Yield; Non-parametric; Regression; Multivariate; Mixed models.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200253
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Use of Morphometric Variables for Differentiating Spanish Hound Breeds International Journal of Morphology
González,A; Luque,M; Rodero,E; González,C; Aguilera,R; Jiménez,J; Sepúlveda,N; Bravo,S; Herrera,M.
The term Podencos refers to a group of dog breeds from Spain and classification in Group 5 of dog breeds by the Fédération Cynologique Internationale (FCI). The aim of this study was to compare traits morphometric breeds of Podencos; Canario, Ibecenco, Andaluz (small, medium and large) and Orito. Ten morphometric variables were measured in 385 animals (245 females and 140 males), head length, muzzle length, height at withers, rump height, body length, head width, rump width, chest depth, chest girth and the shin circumference. Morphostructural variables were more homogeneous in the Podenco Ibicenco and the Podengo Canario, because for many years there were gradually distinctive trait standards for each breed. The discriminate analysis indicated...
Tipo: Journal article Palavras-chave: Morphometric; Dog breed; Hound; Multivariate.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400030
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