Fish community of a fringing reef at Mochima National Park, Venezuela
E Mendez de E, LJ Ruiz, A Prieto, A Torres de J, A Farina, S Sant, J Barrio, B Marin
Abstract
Se analizó la comunidad de peces asociada a una franja arrecifal en Cautaro, Parque Nacional Mochima, Venezuela. Las observaciones y conteo de las especies se realizaron mensualmente, desde diciembre de 2000 hasta mayo de 2002, mediante censos visuales y a una profundidad media de 2 m. Se identificaron 86 especies, pertenecientes a 31 familias. Las familias con mayor número de especies fueron Scaridae (10), Haemulidae y Labridae (9), asà como Pomacentridae (7) y Serranidae (6), las cuales, conjuntamente con la única especie de Sparidae, acumularon 77.52% de la abundancia total. Las especies Diplodus argenteus (13.15%), Microspathodon chrysurus (13.00%) y Thalassoma bifasciatum (10.79%) fueron las más abundantes y frecuentes (>50%), por lo que pueden considerarse tÃpicas y caracterÃsticas del área estudiada. La diversidad total fue de 4.54 bits indâ??1 y osciló entre 3.33 y 4.25 bits indâ??1 con un promedio de 3.86 bits indâ??1. La equitabilidad varió entre 0.74 y 0.89. El número de individuos por especie, en relación al rango, se ajustó con una regresión lineal altamente significativa (r = 0.976) y un Ãndice de diversidad de la serie logarÃtmica de ï¿¡ï? = 14.19. El análisis trófico de la comunidad indicó que las especies carnÃvoras constituyeron el grupo dominante (63.10%), seguido por las herbÃvoras (21.40%) y omnÃvoras (15.50%). No se detectaron diferencias significativas entre el número de especies observadas y el esperado de acuerdo con la distribución Log-normal, lo cual indica una tendencia a la estabilización en relación al número de especies.
The fish community associated with a fringing reef was studied at Cautaro, Mochima National Park, Venezuela. A systematic sampling design based on visual censuses was carried out from December 2000 to May 2002. A total of 86 species belonging to 31 families were identified, dominated by Scaridae (10), Haemulidae and Labridae (9), Pomacentridae (7) and Serranidae (6), which accumulated, together with the sole species of Sparidae, 77.52% of the total abundance. Diplodus argenteus (13.15%), Microspathodon chrysurus (13.00%) and Thalassoma bifasciatum (10.79%) were the most abundant and frequent (>50%) species, and can therefore be considered typical and characteristic of the study area. The total diversity was 4.54 bits indâ??1 and oscillated between 3.33 and 4.25 bits indâ??1, with an average of 3.86. Equitability varied between 0.74 and 0.89. The relationship between species abundance and rank was significant (r = 0.976) and the diversity index of the log-series based on the number of species was ï¿¡ï? = 14.19. The trophic analysis of the community indicated that the carnivorous species constituted the dominant group (63.10%), followed by the herbivores (21.40%) and omnivores (15.50%). The normal distribution fitted the species abundance data, indicating a tendency towards stabilization in relation to the number of species.
The fish community associated with a fringing reef was studied at Cautaro, Mochima National Park, Venezuela. A systematic sampling design based on visual censuses was carried out from December 2000 to May 2002. A total of 86 species belonging to 31 families were identified, dominated by Scaridae (10), Haemulidae and Labridae (9), Pomacentridae (7) and Serranidae (6), which accumulated, together with the sole species of Sparidae, 77.52% of the total abundance. Diplodus argenteus (13.15%), Microspathodon chrysurus (13.00%) and Thalassoma bifasciatum (10.79%) were the most abundant and frequent (>50%) species, and can therefore be considered typical and characteristic of the study area. The total diversity was 4.54 bits indâ??1 and oscillated between 3.33 and 4.25 bits indâ??1, with an average of 3.86. Equitability varied between 0.74 and 0.89. The relationship between species abundance and rank was significant (r = 0.976) and the diversity index of the log-series based on the number of species was ï¿¡ï? = 14.19. The trophic analysis of the community indicated that the carnivorous species constituted the dominant group (63.10%), followed by the herbivores (21.40%) and omnivores (15.50%). The normal distribution fitted the species abundance data, indicating a tendency towards stabilization in relation to the number of species.
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D.R. UNIVERSIDAD AUTONOMA DE BAJA CALIFORNIA