Dispersion statistics and sample size estimates for three fish species (Symphodus ocellatus, Serranus scriba and Diplodus annularis) in the Lavezzi Islands Marine Reserve (South Corsica, Mediterranean Sea)

Citation
D. Mouillot et al., Dispersion statistics and sample size estimates for three fish species (Symphodus ocellatus, Serranus scriba and Diplodus annularis) in the Lavezzi Islands Marine Reserve (South Corsica, Mediterranean Sea), MAR ECOL-P, 20(1), 1999, pp. 19-34
Citations number
49
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Aquatic Sciences
Journal title
MARINE ECOLOGY-PUBBLICAZIONI DELLA STAZIONE ZOOLOGICA DI NAPOLI I
ISSN journal
0173-9565 → ACNP
Volume
20
Issue
1
Year of publication
1999
Pages
19 - 34
Database
ISI
SICI code
0173-9565(199907)20:1<19:DSASSE>2.0.ZU;2-U
Abstract
For the correct management of the future International Marine Park of Bonif acio, a sampling strategy must be adopted to follow the population fluctuat ions of certain species of fish. This sampling will be carried out by SCUBA visual census using the fixed point method. The information to be gleaned using this method will include estimates of biomass. These data will subseq uently be used to perform both spatial comparisons between sites and tempor al comparisons over periods of several years. In order to reveal the existe nce of statistically significant differences, the sampling strategy adopted must allow accurate means to be obtained which possess relatively low coef ficients of variability. The calculation of this optimum sampling depends o n the spatial distribution of the species examined. The Taylor law (s(2) = a x (x) over bar(b)), which represents a much utilized mean-variance relati onship, will be used to compare the aggregation of three species of fish (S ymphodus ocellatus, Serranus scriba and Diplodus annularis) on two differen t substrate types (Posidonia oceanica meadows and rocks) and for four sites in the Lavezzi Islands. The goodness of fit of this law to the biomass dat a will allow an optimum sampling strategy to be determined for each species with coefficients of variability of 10 and 25%.