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| Lobry, Jeremy; Lepage, Mario; Rochard, Eric. |
| Detecting changes in animal communities suggests that a reference situation exists. It is a particularly difficult task in estuarine environments that are complex and fluctuate with time. Effects of human pressures are difficult to assess due to the scarcity or even the lack of evaluation and monitoring systems. In order to detect anomalies in the functioning of the system and to identify effects of perturbations upon populations and communities, it is necessary to analyse the dynamics in order to infer a reference state. This work aims to describe an approach based on K-Tab analyses and allows to define an average situation called "compromise" which is then compared to a single year of data. In this situation, the Gironde estuary, which has been monitored... |
| Tipo: Text |
Palavras-chave: Fish and shrimp assemblages dynamics; Gironde estuary; Correspondence analysis; Spatial pattern; STATIS. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1989.pdf |
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| Bacher, Cedric; Baud, Jean-pierre. |
| Seasonal growth of juvenile oysters (Crassostrea gigas) kept in an intensive upwelling system was studied from 1984 to 1986 in 60 to 90-day growth experiments. Saline ground water was used to produce Skeletonema costatum which was injected as food into the water supplying the upwelling system. Oyster density, water flow, phytoplankton concentration, temperature and frequency of food addition were controlled. Oyster growth was analysed with multidimensional contingency tables and correspondence analysis. The factors, in order of decreasing influence on growth, were temperature, food concentration and oyster density. A rearing strategy was deduced from the growth analysis for summer and winter. In summer, the density of 120,000 oysters/m2, the flow rate of... |
| Tipo: Text |
Palavras-chave: Nursery; Growth; Correspondence analysis; Multidimensional contingency table analysis; Economic efficiency; Skeletonema costatum; Crassotrea gigas; Nourriture; Croissance; Analyse des correspondances; Table de contingence multidimensionnelle; Rentabilité économique; Skeletonema costatum; Crassostrea gigas. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/publication-3061.pdf |
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| Flament, P; Lepretre, A; Noel, S; Auger, Y. |
| Dix-huit prélèvements d'aérosols ont été effectués en Manche Nord, soit en bordure de mer, soit à quelques milles au large, à l'aide d'un impacteur à cascade (5 étages). L'ensemble des données (concentrations de 8 éléments répartis en 6 classes granulométriques successives) est exploité par analyse factorielle des correspondances. Celle-ci permet de mettre en évidence de larges déformations dans les spectres granulométriques pour les éléments traceurs marin et terrestre (Na et Al). En opposition, les métaux résultant d'activité anthropique (Fe, Pb, Zn, Mn), ont des comportements beaucoup plus typés. Parmi ceux-ci, la présence du manganèse sur le site paraît être indépendante de celle des autres métaux et imputable à une seule source. Pb, Fe, Zn et cuivre... |
| Tipo: Text |
Palavras-chave: Aérosols; Éléments-traces; Analyse par correspondance; Distribution granulométrique; Littoral; Aerosols; Trace elements; Correspondence analysis; Size distribution; Coastal. |
| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00110/22082/19723.pdf |
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| Oliveira, Tiago Mendonça de; Teixeira, Cristina Mara; Pinto, Mariana Olímpia Köhler Marra; Arcebispo, Thiago Luiz Mendes; Soriano-Araújo, Amanda; Cunha, Lucas Maciel; Diniz, Soraia Araújo; Silva, Marcos Xavier. |
| Phthiraptera are lice highly adapted to living as permanent and obligatory ectoparasites of birds and mammals. High infestations by biting lice contribute to the low productivity, loss quality of the eggs, besides weight decrease of chickens. Therefore, this study aimed to evaluate and to characterize the risks involved with the presence of biting lice in laying chicken from Minas Gerais, Brazil, throught a Multiple Correspondence Analysis (MCA). A secondary database with information regarding 402 chicken houses from 42 properties of laying hens from the same region was used and adapted for this study. The variables that composed the correspondence model were selected through Chi-square tests (p ≤ 0.05). A risk index was designed to relate the presence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epidemiology; Lice; Laying hens; Risk index; Correspondence analysis. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/47474 |
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| Oliveira,Tiago Mendonça de; Teixeira,Cristina Mara; Arcebispo,Thiago Luiz Mendes; Antunes,Karla Dias; Rezende,Leandro do Carmo; Cunha,Lucas Maciel; Diniz,Soraia de Araújo; Silva,Marcos Xavier. |
| ABSTRACT: This study was accomplished with the aim to evaluate and to characterize the risks for the presence of Megninia spp. in poultry farms from Minas Gerais, using for that Correspondence Analysis (CA). A secondary database was used and adapted for this study, with information from 402 chicken houses of 42 laying hens commercial properties. Variables used to compose the correspondence model were selected through tests of Qui-square being considered the significant result of P≤0,05. A risk index was built to the presence of Megninia spp. starting from variables considered as risk factors for the presence of those ectoparasites. The CA graph produced for the epidemiological characterization of the presence of Megninia spp. presented an accumulated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Megninia spp.; Risk index; Correspondence analysis. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000900501 |
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