Larvas de peces en el área centro sur de la zona marino-costera del Ecuador
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
La comunidad de larvas de peces fue analizada con base a la información obtenida frente a las localidades de Manta y La Libertad durante Abril 2016 – Abril 2018. Se analizó la comunidad larvaria a través de su composición, abundancia, variación temporal, diversidad y riqueza. Las muestras fueron obtenidas mediante arrastres superficiales con redes cónicas simples de 330 μm de ojo de la malla, la cuantificación se realizó mediante cámaras de Bogorov y la variación espacial y temporal de la abundancia fue determinada mediante el análisis no paramétrico de Kruskal Wallis. La abundancia total fue de 2 265 larvas.100m-3, siendo el orden Perciformes el que dominó en ambas localidades, mientras que E. gracilis, Paralabrax sp., M. cephalus, B. bathymaster y S. atricauda fueron las especies representativas. Las máximas concentraciones se registraron en mayo y septiembre 2016 y enero 2017 frente a Manta y en junio 2016 y julio 2017 frente a La Libertad. La composición y abundancia de las larvas registraron diferencias a nivel espacial y temporal como resultado de las condiciones oceanográficas de cada localidad estudiada, mientras que, la distribución y abundancia de las especies representativas estarían relacionadas con desplazamientos poblacionales en los periodos reproductivos, características ecológicas de cada especie y las condiciones oceanográficas existentes durante la investigación.
The fish larvae community was analyzed based on the information obtained about fish larvae from Manta and La Libertad during April 2016 - April 2018. The larval community was analyzed through its composition, abundance, temporal variation, diversity and richness. The samples were obtained through superficial trawls with simple conic nets of 330 μm mesh size and Bogorov cameras were used for the quantification. Variations in abundance at spatial and temporal level were determined by the Kruskal Wallis' nonparametric analysis. Total abundance was 2 265 larvae.100m-3, being order Perciformes, the dominant in both localities, while E. gracilis, Paralabrax sp., M. cephalus, B. bathymaster and S. atricauda were the most representative species. The highest density concentrations were registered in May and September 2016 and January 2017 in Manta, whilst in front of La Libertad were registered in June 2016 and July 2017. The differences in larvae composition and abundance at spatial and temporal level are the result of the oceanographic conditions of each locality studied, while the distribution and abundance of the representative species could be related to population displacements during reproductive periods, ecological characteristics of the species and oceanographic conditions presented during the investigation.
The fish larvae community was analyzed based on the information obtained about fish larvae from Manta and La Libertad during April 2016 - April 2018. The larval community was analyzed through its composition, abundance, temporal variation, diversity and richness. The samples were obtained through superficial trawls with simple conic nets of 330 μm mesh size and Bogorov cameras were used for the quantification. Variations in abundance at spatial and temporal level were determined by the Kruskal Wallis' nonparametric analysis. Total abundance was 2 265 larvae.100m-3, being order Perciformes, the dominant in both localities, while E. gracilis, Paralabrax sp., M. cephalus, B. bathymaster and S. atricauda were the most representative species. The highest density concentrations were registered in May and September 2016 and January 2017 in Manta, whilst in front of La Libertad were registered in June 2016 and July 2017. The differences in larvae composition and abundance at spatial and temporal level are the result of the oceanographic conditions of each locality studied, while the distribution and abundance of the representative species could be related to population displacements during reproductive periods, ecological characteristics of the species and oceanographic conditions presented during the investigation.
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DIVERSIDAD, GERRIDAE, LARVAS DE PECES, PERCIFORMES