Data/hora: 06/06/2024 12:19:12

Provedor de dados: 	5	
País: 	France	
Título: 	Une procédure systématique pour le sous-échantillonnage des prélèvements de plancton	
Autores: 	Koutsikopoulos, Constantin; Petitgas, Pierre.	
Data: 	1990	
Ano: 	1990	
Palavras-chave: 	Plancton; Sous-échantillonnage; Effort; Précision; Plankton; Sub-sampling; Effort; Precision.	
Resumo: 	It is often necessary to sub-sample plankton samples even if the precision of the estimation is thereby decreased. A methodological optimization is looked for. The variance depends on the procedure of construction of the aliquot (strategy) and the number of individuals counted (effort). The sub-sampling effort is allocated in a general context of repartition of the total effort between sampling and sub-sampling. This effort depends on the time consumed by the sub-sampling procedure, the volume of the aliquot and the number of individuals counted. For the same effort, a systematic procedure for the construction of sub-samples is more precise than a random one because it travels through the entire sample and is thus less dependent on the spatial distribution of the organisms in the sub-sampling tank. The calculation of the subsampling variance in routine is suggested because deviations from the theoretical models are frequent, especially for the high levels of abundance.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00131/24259/22252.pdf	
Editor: 	Gauthier-Villars	
Relação: 	http://archimer.ifremer.fr/doc/00131/24259/	
Formato: 	application/pdf	
Fonte: 	Oceanologica Acta (0399-1784) (Gauthier-Villars), 1990 , Vol. 13 , N. 3 , P. 403-409	
Fonte: 	Gauthier-Villars