Data/hora: 29/05/2024 08:54:52

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Sampling design optimization for EROD measurements in fish
Autores: | Beliaeff, Benoit; Burgeot, Thierry.
Data: | 1997
Ano: | 1997
Palavras-chave: | Biomonitoring; Estimation; EROD activity; Statistical power; Sample size; Sampling design.
Resumo: | Activity of 7-ethoxyresorufin-O-deethylase (EROD) in fish is certainly the best-studied biomarker of exposure applied in the field to evaluate biological effects of contamination in the marine environment. Since 1991, a feasibility study for a monitoring network using this biomarker of exposure has been conducted along French coasts. Using data obtained during several cruises, this study aims to determine the number of fish required to detect a given difference between 2 mean EROD activities, i.e. to achieve an a priori fixed statistical power (l-beta) given significance level (alpha), variance estimations and projected ratio of unequal sample sizes (k). Mean EROD activity and standard error were estimated at each of 82 sampling stations. The inter-individual variance component was dominant in estimating the variance of mean EROD activity. Influences of alpha, beta, k and variability on sample sizes are illustrated and discussed in terms of costs. In particular, sample sizes do not have to be equal, especially if such a requirement would lead to a significant cost in sampling extra material. Finally, the feasibility of longterm monitoring is discussed.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00337/44787/44483.pdf

DOI:10.3354/meps153239

http://archimer.ifremer.fr/doc/00337/44787/

Editor: | Inter-research
Formato: | application/pdf
Fonte: | Marine Ecology Progress Series (0171-8630) (Inter-research), 1997 , Vol. 153 , P. 239-246

Fonte:

Inter-Research 1997

info:eu-repo/semantics/openAccess

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