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	Provedor de dados Acta biol.Colomb. (1) ArchiMer (1) Autor CASTRO-REBOLLEDO,MARÍA ISABEL (1) DONATO-RONDÓN,JOHN CHARLES (1) Laurec, Alain (1) MUÑOZ-GRACIA,ISABEL (1) Menesguen, Alain (1) Palavra-chave Nutrient enrichment (2) Analyse spectrale (1) Deseasonalisation (1) Désaisonnalisation (1) Eutrophisation (1) Food webs (1) Gut content (1) Isotope ratios (1) Multivariate time-series (1) Spectral analysis (1) Séries temporelles multivariées (1) Trophic compartments (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Text (1) Ano 2014 (1) 1984 (1) País Colombia (1) France (1) Idioma Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Analyse statistique de l'évolution temporelle de paramètres hydrobiologiques dans les bassins du port du Havre ArchiMer Menesguen, Alain; Laurec, Alain. The study of the spatial structure and temporal evolution of several hydrobiological parameters in a flooding docks system provided a good illustration for the analytical power of a methodology dealing with the statistical processing of multivariate timeseries. This technique can be characterized by prior extraction of the trends, treated separately as ordinary multivariate data, and by a consequent multi-spectral analysis of the residual signais. This procedure offers the advantage of clarifying the analysis of the major features of the phenomenon (i.e. the trends) and unmasking the subtle spatio-temporal structure through the residual signais. The application on Le Havre harbour showed a strong enrichment in nutrients and also a plausible but partial... Tipo: Text Palavras-chave: Analyse spectrale; Désaisonnalisation; Séries temporelles multivariées; Eutrophisation; Spectral analysis; Deseasonalisation; Multivariate time-series; Nutrient enrichment. Ano: 1984 URL: http://archimer.ifremer.fr/doc/00113/22466/20147.pdf FOOD WEB OF A TROPICAL HIGH MOUNTAIN STREAM: EFFECTS OF NUTRIENT ADDITION Acta biol.Colomb. CASTRO-REBOLLEDO,MARÍA ISABEL; MUÑOZ-GRACIA,ISABEL; DONATO-RONDÓN,JOHN CHARLES. In order to define the effect of nutrient enrichment on trophic webs in an Andean mountain stream we performed an experiment using stable isotope ratios (δ15N and δ13C) to analyze different trophic compartments: 1) basal level: CPOM and biofilm; 2) primary consumers - macroinvertebrates: collector-gatherers (Heterelmis sp., Thraulodes sp. and Trichorythodes sp.), and collectorfilterers (Simulium sp.); 3) predators - fish (Oncorhynchus mykiss and Trichomycterus bogotensis). The average fractionation of nitrogen among the primary consumers with respect to CPOM was 4.7 ‰, and 1.7 ‰ with respect to biofilm. Predators incremented their δ15N signal by 5.9 % with respect to primary consumers. A depletion of δ15N was observed in Impact with respect to Control... Tipo: Info:eu-repo/semantics/article Palavras-chave: Food webs; Gut content; Isotope ratios; Nutrient enrichment; Trophic compartments. Ano: 2014 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2014000100004 Registros recuperados: 2 Primeira ... 1 ... Última

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