Índices gonadales y moleculares en el erizo de mar Lytechinus variegatus (Echinoidea: Toxopneustidae) del Golfo de Cariaco, Venezuela

Gonadal and molecular indices in the sea-urchin Lytechinus variegatus (Echinoidea: Toxopneustidae) from Cariaco Gulf, Venezuela

Autores/as

DOI:

https://doi.org/10.22370/rbmo.2023.58.2.4212

Palabras clave:

Crecimiento somático, índice ARN:ADN, índice gonadosomático, desove, surgencia, estratificación, echinoideos

Resumen

La extracción activa del erizo de mar Lytechinus variegatus en el noreste de Venezuela podría conllevar a una reducción de su densidad poblacional. Por consiguiente, el conocimiento sobre el crecimiento somático y la producción gonadal es de importancia para la explotación racional y el manejo sustentable de sus poblaciones. Durante un ciclo anual, este estudio examinó la biología reproductiva e índices moleculares de crecimiento (ARN:ADN y Proteína:ADN) de una población del erizo L. variegatus en el Golfo de Cariaco (Venezuela); un ecosistema marino regulado por las temporadas de estratificación y surgencia costera. La población de erizos de mar presentó tallas homogéneas, con incrementos significativos en la masa fresca total (MF) y el índice gonadosomático (IG) durante la estratificación. Se obtuvieron modelos de regresión significativos durante los periodos de surgencia y estratificación, particularmente entre la MF en relación con las dimensiones de la testa y linterna de Aristóteles. El desarrollo gonadal fue continuo, mostrando desoves parciales durante el período de surgencia. El cociente ARN:ADN incrementó durante la temporada de estratificación, no así el cociente Proteína:ADN. El Análisis de Componentes Principales indicó asociación entre los índices moleculares de crecimiento con el seston, contrariamente a la biomasa fitoplanctónica, y la temperatura superficial del agua. El ciclo reproductivo del L. variegatus presentó un patrón estacional asociado a la temperatura y productividad primaria; desova activamente durante la temporada de surgencia, y la gametogénesis se potencia durante la estratificación, cuando son mayores los procesos metabólicos.

Biografía del autor/a

Édgar Zapata-Vívenes, Universidad Técnica de Manabí

Autor corresponsal: edgar.zapata@utm.edu.ec

Citas

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2023-12-31

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Zapata-Vívenes, Édgar, Reyes-Luján, J., Ochoa, S., Arrieche, D., & Lodeiros, C. (2023). Índices gonadales y moleculares en el erizo de mar Lytechinus variegatus (Echinoidea: Toxopneustidae) del Golfo de Cariaco, Venezuela: Gonadal and molecular indices in the sea-urchin Lytechinus variegatus (Echinoidea: Toxopneustidae) from Cariaco Gulf, Venezuela. Revista De Biología Marina Y Oceanografía, 58(2), 98–108. https://doi.org/10.22370/rbmo.2023.58.2.4212

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