Distribution, abundance and assemblages of decapod crustaceans in waters off Guinea-Bissau (north-west Africa)

作者：Munoz Isabel^*; Garcia Isarch Eva; Sobrino Ignacio; Burgos Candelaria; Funny Rita; Gonzalez Porto Marcos

来源：Journal of the Marine Biological Association of the United Kingdom, 2012, 92(3): 475-494.

DOI：10.1017/S0025315411001895

• decapod crustaceans
• species composition
• diversity
• abundance
• bathymetric distribution
• faunal assemblages
• Guinea-Bissau
• central eastern Atlantic
• north-west Africa

This study constitutes a first contribution to the knowledge of the ecology of the decapod crustaceans in waters off Guinea-Bissau. Samples were collected during a survey undertaken between October and November 2008. A total of 122 species of decapod crustaceans were identified. Results showed an increase of decapod biomass and abundance with depth, reaching maxima values in the 200-500 m depth stratum but decreasing at depths over 500 m. Average diversity by strata increased with depth, with maximum over the deep slope. Seven main assemblages were identified: five primarily associated with depth-coastal shelf (%26lt;60 m), shelf (60-200 m), upper slope (200-300 m), middle slope (300-500 m), deep slope (500-1000 m)-and two other northern shelf assemblages affected by sediment type-coastal shelf-north (%26lt;50 m) and shelf-north (50-100 m). Species of each assemblage are typified. This study provides new information about composition, distribution, abundance and assemblage structure of decapod crustaceans in Guinea-Bissau that may be useful for future assessment of the effect of trawling pressure in the area.

• 出版日期2012-5