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Registros recuperados: 6
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Diet is correlated with otolith shape in marine fish ArchiMer
Mille, Tiphaine; Mahe, Kelig; Cachera, Marie; Villanueva, Ching-maria; De Pontual, Helene; Ernande, Bruno.
Previous studies have shown that food amount influence fish otolith structure, opacity and shape and that diet composition has an effect on otolith chemical composition. This study investigated the potential correlation between diet and otolith shape in 5 wild marine fish species by addressing 4 complementary questions. First, is there a global relationship between diet and otolith shape? Second, which prey categories are involved in this relationship? Third, what are the respective contributions of food quantity and relative composition to diet–otolith shape co-variation? Fourth, is diet energetic composition related to otolith shape? For each species, we investigated how otolith shape varies with diet. These questions were tackled by describing diet in...
Tipo: Text Palavras-chave: Fourier analysis; English Channel; Interspecific; Morphometric analysis; Otolith growth; Saccular otolith; Stomach contents.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00345/45639/45269.pdf
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Formulation and analysis of a diffusion-velocity particle model for transport-dispersion equations ArchiMer
Mycek, Paul; Pinon, Gregory; Germain, Gregory; Rivoalen, Elie.
The modelling of diffusive terms in particle methods is a delicate matter and several models were proposed in the literature to take such terms into account. The diffusion velocity method (DVM), originally designed for the diffusion of passive scalars, turns diffusive terms into convective ones by expressing them as a divergence involving a so-called diffusion velocity. In this paper, DVM is extended to the diffusion of vectorial quantities in the three-dimensional Navier–Stokes equations, in their incompressible, velocity–vorticity formulation. The integration of a large eddy simulation (LES) turbulence model is investigated and a DVM general formulation is proposed. Either with or without LES, a novel expression of the diffusion velocity is derived,...
Tipo: Text Palavras-chave: Diffusion velocity method; Particle method; Fourier analysis; Transport-dispersion equations; Navier-Stokes equations.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00250/36128/34772.pdf
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Periodicidades, tendencias e previsao a partir da analise espectral dinamica da serie dos niveis do rio Paraguai, em Ladario (1990/1995). Repositório Alice
NORDEMANN, D.J.R..
As series das medias mensais e anuais dos valores do nivel do rio Paraguai, em Ladario (1990/1995), foram estudadas por varios metodos numericos que incluem: analise de Fourier, periodograma, analise espectral dinamica e regressao iterativa. A finalidade do trabalho e identificar as grandes caracteristicas do regime do rio e, atraves das principais periodicidades embutidas na serie, as possiveis causas ou os fatores que podem intervir em suas variacoes. O regime do rio nao e estacionario, porem, tentou-se utilizar apenas as oito periodicidades maiores para prever o comportamento do rio numa escala de tempo de algumas decadas.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Analise de Fourier; Hidrologia; Inundacao; Fourier analysis; Hidrology; Inundation.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/95334
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Predicción del evento El Niño 97-98 en el mar ecuatoriano usando métodos estadísticos OceanDocs
Zambrano, E.; Martínez, R.; Garcés Vargas, J..
Usando series de tiempo de promedios diarios de nivel del mar en años caracterizados por la ocurrencia de eventos El Niño en la estación mareográfica de La Libertad (02°15'S-81°27'W), se aplicaron las técnicas del análisis espectral para determinar la correlación existente entre los eventos pasados y el primer semestre de 1997. Se obtuvieron niveles significativos de coherencia entre el evento El Niño 1982-1983 con el evento del 1997. El análisis espectral comparativo permitió obtener las ondas predominantes, la amplitud y el ángulo de fase de cada una de ellas. Con estos parámetros y aplicando la serie de Fourier, se generó una serie del nivel del mar que permitió predecir el comportamiento del nivel del mar en La Libertas desde julio 97 hasta marzo 98...
Tipo: Journal Contribution Palavras-chave: Prediction; El Nino phenomena; Spectral analysis; Fourier analysis; Sea level; Oceanographic data; Time series; Prediction; Spectral analysis; Sea level.
Ano: 2000 URL: http://hdl.handle.net/1834/2233
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Sources de variation intra-populationelle de la morphologie des otolithes: asymétrie directionnelle et régime alimentaire ArchiMer
Mille, Tiphaine.
Otoliths are calcified structures located in Osteichthyes’ inner ear that are involved in audition and balance. Their morphology is used as an indicator of various ecological processes or properties. This application requires identifying the endogenous and exogenous factors that act simultaneously as sources of shape variation. This thesis aims at detecting and quantifying the relative contributions of directional asymmetry and diet to otolith shape variation at the intra-population level. Directional asymmetry between left and right otoliths was found in flat-fishes, the blind-side otolith being always longer and larger, whereas it was negligible in round-fishes. However, asymmetry amplitude never exceeded 18 %, which suggests evolutionary canalization of...
Tipo: Text Palavras-chave: Otolithes; Oreille interne; Ostéichtyens; Symétrie; Alimentation; Analyse de forme; Analyse de Fourier; Morphométrie géométrique; Otoliths; Inner ear; Osteichthyes; Symmetry; Diet composition; Shape analysis; Fourier analysis; Geometric morphometrics.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00344/45536/45108.pdf
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The Vertical Structure of Large-Scale Unsteady Currents ArchiMer
Hochet, Antoine; Colin De Verdiere, Alain; Scott, Robert.
A linear model based on the quasigeostrophic equations is constructed in order to predict the vertical structure of Rossby waves and, more broadly, of anomalies resolved by altimeter data, roughly with periods longer than 20 days and with wavelengths larger than 100 km. The subsurface field is reconstructed from sea surface height and climatological stratification. The solution is calculated in periodic rectangular regions with a 3D discrete Fourier transform. The effect of the mean flow on Rossby waves is neglected, which the authors believe is a reasonable approximation for low latitudes. The method used has been tested with an idealized double- gyre simulation [performed with the Miami Isopycnal Coordinate Ocean Model (MICOM)]. The linear model is able...
Tipo: Text Palavras-chave: Circulation/ Dynamics; Ocean dynamics; Rossby waves; Waves; Oceanic; Mathematical and statistical techniques; Fourier analysis; Models and modeling; Quasigeostrophic models.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00260/37081/35586.pdf
Registros recuperados: 6
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