Composición Y Estructura Del Ensamblaje De Crustáceos Brachyura De La Plataforma Continental De La Guajira Colombiana Y Su Relación Con La Profundidad Y Las Características Del Sedimento

Abstract

Brachyura crustaceans composition and structure assemblage along be continental shelf of La Guajira and its variation according to depth gradient and sediment characteristics were determined. 44 bottom drag samples were taken at 10 and 50 m depth using a semi globe demersal net, during March and April 2005. 83 species belonging to 21 families were identified; the most important families due to their abundance of specimens and amount of species were Goneplacidae, Portunidae, and Mithracidae; and dominant species were Glyptoplax smithii, with, 12.53 % of total abundance; Portunus spinicarpus, 7.42 % and Nemausa cornuta, 6.84 %. The non-metric multidimensional scaling analysis (NMDS) did not show any well defined sampling station clusters, but meaningful statistical differences were found in the assemblage structure according to depth gradient and the different kinds of sediments. The ANOSIM tests and the ordination analysis (NMDS) pointed out that there is a single assemblage that varies gradually with depth, and to a lesser degree by physical sediments characteristics. The ordination (NMDS) also reveals that the assemblage is more heterogeneous at 10 m than at 50 m depth, possibly as a result of the larger environmental variability close to the coast, in comparison with the environmental stability that characterizes deeper zones.

Decapod crustaceans associated with the shrimp fishery of the central-south portion of Veracruz, Mexico

“…Further, the dominance of a few species also affects community structure. These findings are in line with data reported by Gómez-Lemos et al (2010), who showed that depth was one of the main factors that affected the composition of the assemblage.…”

“…Even though knowledge regarding the composition of the brachyuran crab assemblages in the area is available, understanding its interaction with shrimp fishing in the central-southern portion of Veracruz is scarce since most previous studies have been inventories and taxonomic studies (Gómez-Lemos et al 2010). The fishing activity involves removing species due to shrimp trawling and the low selectivity of fishing nets.…”

Effect of Seasonal Rains and Floods on Seedling Recruitment and Compositional Similarity in Two Lowland Tropical Forests

“…R values between 0.75 and 1 indicate that ordinations are completely different, and values between 0 and 0.25 indicate that there is minimal difference [54]. This is a robust test for comparing and validating the affinity between ecological compositional arrangements [55,56].…”

Composición y distribución de los crustáceos de profundidad capturados con nasas en el área marina del departamento del Magdalena caribe colombiano

“…La mayoría de las especies se encontraron dentro del rango de distribución batimétrica reportado previamente por otros autores en el mundo (FELDER et al, 2009;HOLTHUIS, 1991;KING, 1984;KOMAI y KOMATSU, 2009;PEQUEGNAT & PEQUEGNAT, 1970;PÉREZ-FARFANTE & BULLIS 1973;WILLIAMS, 1984;POUPIN, 1994;RATHBUN, 1937) y para Colombia (CAMPOS et al, 2005;GÓMEZ-LEMOS et al, 2010;PARAMO et al, 2017), con excepción de P. politus que solo se había registrado hasta los 330 m (FELDER et al, 2009) y en el presente estudio se capturó por encima de los 400 m (Figura 2). La amplia distribución de profundidad de algunos crustáceos decápodos se debe a que mantienen un alto metabolismo a través de su comportamiento nectobentónico (COMPANY & SARDÀ, 1998) y son capaces de movilizarse a áreas de alimentación más favorables.…”