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Distribution and density of carnivorous fish species around Lanzarote and Fuerteventura, Canary Islands
Lorance, P.; Souissi, S.; Uiblein, F.; Castillo Eguia, R. (2001). Distribution and density of carnivorous fish species around Lanzarote and Fuerteventura, Canary Islands. Sci. Counc. Rep. NAFO Serial No. N44563(Doc. 01/168): 1-14
In: Scientific Council Reports. Northwest Atlantic Fisheries Organization. Northwest Atlantic Fisheries Organization: Dartmouth, N.S.. ISSN 0250-6416, more

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Keywords
    Demersal fisheries; Density; Longlining; Poisson's equation; Species diversity; ASE, Canary I. [Marine Regions]; ASE, Canary I., Lanzarote [Marine Regions]; Marine

Authors  Top 
  • Lorance, P., more
  • Souissi, S., more
  • Uiblein, F., more
  • Castillo Eguia, R.

Abstract
    The distribution patterns of the fish species around Lanzarote and Fuerteventura (Canary Islands, NE Atlantic) was investigated from 223 longline stations from 0 to 1200 m. Seventy-three species and a total of 1885 individuals were caught. The full data set was stratified according to the depth distribution of stations. The accuracy of the stratification was investigated from multivariate analysis and study of indicator species. The muitivariate analysis reveal no geographical pattern in the species distribution around these islands. Poisson's and Exponential probability distributions were fitted to the number of species and individuals caught per longline station. The probability distributions fitted well the data. This knowledge of the probability distribution of the number of species and individuals caught per station allowed to compare the density and diversity per strata because parametric confidence intervals could be estimated. The mean number of species per station, which was both the mean and variance of the Poisson's distribution was used as an index of the small-scale diversity that can be used in complement of the usual Shannon diversity index. The interest of this method for ecological studies of the fish assemblage in the context of not-trawlable grounds, in particular along the slope and other deep areas is discussed, in particular with regards to the small scale diversity.

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