Variación espacio-temporal de la densidad y biomasa seca del guacuco tivela mactroides (Bivalvia: Veneridae) de la ensenada de la guardia, Isla de Margarita, Venezuela |Spatial-temporal variation of density and dry biomass of the triagonal clam tivela mactroides (Bivalvia: Veneridae) from la guardia inlet, Margarita Island, Venezuela
Resumen
El guacuco Tivela mactroides era muy abundante en playas arenosas de algunas costas del nororiente de Venezuela, donde es explotado comercialmente. Dada su importancia ecológica y económica y su desigual extracción en el área, se evaluó la densidad y biomasa seca de T. mactroides en la ensenada de La Guardia, Isla de Margarita, Venezuela. Las muestras obtenidas fueron procesadas en el laboratorio, para determinar la densidad en ind/m2 y biomasa seca en g/m2. La densidad, presentó diferencias espaciales y temporales, registrando el mayor valor promedio en el sector central (102 ind/m2) y el menor valor promedio en el sector occidental (19 ind/m2). La biomasa total anual promedio fue de 901 g/m2/año en la ensenada de La Guardia, con variaciones espaciales y temporales de la misma debido a cambios fisiológicos en los organismos (periodos de maduración y engorde) en respuesta a la variación de los parámetros ambientales que dependen del efecto de la surgencia costera estacional en la costa nororiental de Venezuela.
Palabras clave: Mollusca, Bivalvia, manejo, pesquería.
ABSTRACT
The triagonal clam Tivela mactroides was very abundant in sandy beaches in north-east of Venezuela coastline, where is submitted to an open access fisheries. To see the ecological and economical importance and it desigual extraction in the area, we estimated density and dry biomass of T. mactroides in La Guardia inlet, Margarita Island, Venezuela. The samples were taken with a core, monthly and processed in the laboratory. Density was estimated as ind/m2 and dry biomass as g/m2. Density was presents difference in space and time, where the mayor value was to central sector (102 ind/m2) and the minor value to the occidental sector (19 ind/m2). The total annual dry biomass, shows a value of 901 g/m2/year in La Guardia inlet, being variable during the year and between stations maybe conditioned to physiologic changes from the organisms as a response of environmental parameters which depends to the stationed upwelling effect in the northeaster coast of Venezuela.
Key words: Mollusca, Bivalvia, management, fishery.
Palabras clave: Mollusca, Bivalvia, manejo, pesquería.
ABSTRACT
The triagonal clam Tivela mactroides was very abundant in sandy beaches in north-east of Venezuela coastline, where is submitted to an open access fisheries. To see the ecological and economical importance and it desigual extraction in the area, we estimated density and dry biomass of T. mactroides in La Guardia inlet, Margarita Island, Venezuela. The samples were taken with a core, monthly and processed in the laboratory. Density was estimated as ind/m2 and dry biomass as g/m2. Density was presents difference in space and time, where the mayor value was to central sector (102 ind/m2) and the minor value to the occidental sector (19 ind/m2). The total annual dry biomass, shows a value of 901 g/m2/year in La Guardia inlet, being variable during the year and between stations maybe conditioned to physiologic changes from the organisms as a response of environmental parameters which depends to the stationed upwelling effect in the northeaster coast of Venezuela.
Key words: Mollusca, Bivalvia, management, fishery.
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