Data/hora: 11/06/2024 12:01:27

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