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Cascadas tróficas en un ecosistema anteriormente dominado por el bacalao.

Kenneth T Frank¹, Brian Petrie, Jae S Choi

¹Department of Fisheries and Oceans, Bedford Institute of Oceanography, Ocean Sciences Division, Post Office Box 1006, Dartmouth, Nova Scotia, B2Y 4A2, Canada. frankk@mar.dfo-mpo.gc.ca

Science (New York, N.Y.)

|June 11, 2005

Resumen

Este resumen es generado por máquina.

La eliminación de los principales depredadores como el bacalao puede reestructurar enteras redes alimentarias del océano. Este estudio demuestra un efecto de cascada trófica en un ecosistema marino grande y complejo, desafiando suposiciones anteriores.

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Área de la Ciencia:

Ecología marina Ecología marina.
La Dinámica de los Ecosistemas
Pesca Ciencia Pesca Ciencia

Sus antecedentes:

La eliminación de los principales depredadores puede desencadenar cascadas tróficas, alterando las estructuras de la red alimentaria.
Tales cascadas han sido documentadas en sistemas simples y de pequeña escala.
Su aparición en grandes y complejos ecosistemas de océano abierto sigue siendo en gran parte no confirmada.

Objetivo del estudio:

Para investigar la presencia de cascadas tróficas en un gran ecosistema marino.
Para analizar datos ecológicos a largo plazo de una región históricamente dominada por el bacalao.
Evaluar las implicaciones más amplias para el colapso de las poblaciones de peces.

Principales métodos:

Se utilizaron datos ecológicos de varias décadas del noroeste del Atlántico.
Analizó la dinámica de la red alimentaria en respuesta a los cambios en las poblaciones de depredadores máximos.
Examinó los datos históricos de la pesca y la estructura del ecosistema.

Principales resultados:

Demostró una cascada trófica significativa dentro del ecosistema del Atlántico noroeste.
La evidencia sugiere la reestructuración de la red alimentaria después de la disminución de las poblaciones de bacalao.
Se observaron efectos en cascada que afectan a los niveles tróficos inferiores.

Conclusiones:

Las cascadas tróficas pueden ocurrir e impactar significativamente en ecosistemas marinos grandes y complejos.
El colapso de las poblaciones de bacalao puede iniciar cambios duraderos en todo el ecosistema.
Los hallazgos sugieren posibles cascadas tróficas en otros sistemas de poblaciones de peces colapsados a nivel mundial.