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El tamaño del ecosistema determina la longitud de la cadena alimentaria en los lagos

D M Post¹, M L Pace, N G Hairston

¹Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York 14853, USA. dmp18@cornell.edu

|July 13, 2000

Resumen

El tamaño del ecosistema, no la productividad, determina la longitud de la cadena alimentaria en los sistemas naturales. Este hallazgo impacta la comprensión de las comunidades ecológicas y los niveles de contaminantes en los depredadores.

Área de la Ciencia:

Ecología Ecología Ecología.
La Dinámica de los Ecosistemas

Sus antecedentes:

La longitud de la cadena alimentaria es una característica ecológica clave que influye en la estructura de la comunidad y la bioacumulación de contaminantes.
Las hipótesis anteriores sobre los determinantes de la longitud de la cadena alimentaria (productividad, tamaño del ecosistema) carecen de un soporte empírico sólido.

Objetivo del estudio:

Probar empíricamente la hipótesis de la productividad, la hipótesis del tamaño del ecosistema y la hipótesis del espacio productivo para la longitud de la cadena alimentaria.
Determinar los principales impulsores de la longitud de la cadena alimentaria en los ecosistemas naturales.

Principales métodos:

Análisis comparativo de la longitud de la cadena alimentaria en varios ecosistemas naturales.
Pruebas estadísticas de las relaciones entre la longitud de la cadena alimentaria, el tamaño del ecosistema y la productividad.

Principales resultados:

La longitud de la cadena alimentaria aumenta significativamente con el tamaño del ecosistema.
No se encontró una relación significativa entre la longitud de la cadena alimentaria y la productividad del ecosistema.

Conclusiones:

El tamaño del ecosistema es el principal determinante de la longitud de la cadena alimentaria, lo que contradice las hipótesis centradas únicamente en la productividad.
Los hallazgos sugieren que el tamaño del ecosistema influye en la disponibilidad de recursos y la complejidad del hábitat, lo que da forma a la estructura de la cadena alimentaria.

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