Consulta: subjectFacets:"Modèle linéaire"
Registros recuperados: 3
Data/hora: 08/06/2024 09:24:03

Puissance de peche et relations avec les caracteristiques techniques des navires. Exemple de flottilles pratiquant le chalutage en Mediterranee
Provedor de dados: 5
Autores: Perodou, Jean-bernard; Andrianavaly, Jean.
The topic of this work is to analyse two sets of fishing statistics, one concerns ships which landed their catches at Sète during the 88-94 period, the other ships which landed their catches in different fish markets of Lion's gulf during the 94-97 period. Cpue are treated by a log-linear model with three qualitative variables which provides fishing powers of ships, abundance index of species in monthly strata and in annual strata. These three factors are revealed to be statistically significant and form the following hierarchy : first fishing power of ships, secondly monthly index and thirdly annual index of abundance of species. Engine power is revealed to be a minor explicative factor of differences between fishing powers of ships. Two other explicative...
Tipo: Text
Palavras-chave: Chalutiers du golfe du Lion; Indice d'abondance; Puissance de pêche; Modèle linéaire; Statistique de pêche; Lion's gulf trawlers; Abundance index; Fishing power; Linear model; Fishing statistic.
Ano: 1999
URL: https://archimer.ifremer.fr/doc/1999/rapport-1574.pdf

Analyse des tendances des séries temporelles de la concentration en azote minéral dissous dans les trois principaux estuaires de la façade Manche-Atlantique
Provedor de dados: 5
Autores: Gailhard, Isabelle.
Estuaries are areas which, from their structure, their fonctioning, and their localisation, are subject to significant contribution of nutrients. One of the objectif of the RNO, the French network for coastal water quality monitoring, is to assess the levels and trends of nutrient concentrations in estuaries. A linear model was used in order to describe and to explain the total dissolved nitrogen concentration evolution in the three most important estuaries on the Chanel-Atlantic front (Seine, Loire and Gironde). As a first step, the selection of a reliable data set was performed. Then total dissolved nitrogen evolution schemes in estuary environment were graphically studied, and allowed a resonable choice of covariables. The salinity played a major role...
Tipo: Text
Palavras-chave: Nutriments; Estuaire; Loire; Seine; Gironde; Schéma de dilution; Modèle linéaire; Tendance; Nutrients; Estuary; Seine; Loire; Gironde; Dilution schema; Linear mode1; Trend.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00079/19070/16665.pdf

Application of Leslie's model on a population of common dolphins (Delphinus delphis): Sensitivity study
Provedor de dados: 5
Autores: Fifas, Spyros; Goujon, Michel; Antoine, Loic.
The rapid development of the albacore tuna (Thunnus alalunga) driftnet fishery in the Pay of Biscay (Atlantic ocean, France) has incited European management authorities to ask for a study of its ecological impact on populations of common dolphins and striped dolphins. A programme with onboard observers has been led during 1992 and 1993, and a sighting survey has allowed the evaluation of the abundances of fractions of populations in the studied area. For the population of common dolphins, the biological parameter estimation has allowed the building of a discrete age-structured model based on a Leslie matrix. Sensitivity studies have been conducted using four model parameters (age of first reproduction, interval between births, juvenile and adult survival...
Tipo: Text
Palavras-chave: Survival rate; Driftnet fishery; Common dolphin; Linear model; Taux de survie; Pêche au filet maillant dérivant; Modèle linéaire; Modèle linéaire.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-865.pdf