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Redes alimentarias basadas en detritos: explotación por el salmón chum juvenil (Oncorhynchus keta)
Science (New York, N.Y.)
|May 6, 1977
Resumen
Los copépodos harpacticoides son un alimento crucial para el salmón chum joven en los estuarios. Estos copépodos prefieren el detritus, vinculando al salmón a una red alimenticia bentónica, no sólo al plancton.
Área de la Ciencia:
- Biología marina Biología marina.
- Ecología de los estuarios.
- Ciencia de la pesca Ciencia de la pesca
Sus antecedentes:
- Los copépodos harpacticoides son una fuente de alimento primaria para el salmón chum juvenil durante su fase estuarina temprana y crítica.
- El salmón Chum es un pez comercialmente importante, generalmente visto como alimento de los planctívoros.
- Comprender la dieta del salmón juvenil es vital para la gestión de esta valiosa pesquería.
Objetivo del estudio:
- Para investigar las preferencias dietéticas de los copépodos harpacticoides en entornos estuarios.
- Para determinar los vínculos tróficos entre los copépodos harpacticoides, sus fuentes de alimento y el salmón chum juvenil.
- Aclarar la contribución de las redes alimenticias bentónicas derivadas a la dieta de peces comercialmente importantes.
Principales métodos:
- Análisis del contenido intestinal de los copépodos harpacticoides.
- Análisis de isótopos estables para rastrear fuentes de alimentos.
- Examen de la composición de la dieta del salmón chum juvenil.
Principales resultados:
- Los copépodos harpacticoides ingieren preferentemente fuentes de alimento heterotróficas, en particular los detritus.
- El estudio revela una dependencia significativa de los harpacticoides de los detritos derivados del bento.
- Este hallazgo conecta el salmón chum comercialmente valioso con una red alimentaria basada en detritos.
Conclusiones:
- Los copépodos harpacticoides juegan un papel clave en la transferencia de energía de los detritos al salmón chum juvenil.
- La dieta del salmón chum en los estuarios es más compleja de lo que se suponía anteriormente, incorporando recursos bentónicos.
- Esta investigación reevalúa la posición trófica del salmón chum dentro de los ecosistemas estuarios.
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