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Control trófico de la producción en una comunidad intermareal rocosa
1Department of Zoology, University of Washington, Seattle, WA 98195-1800, USA.
Science (New York, N.Y.)
|April 27, 2002
Resumen
La reducción de los pastores en la zona baja intermareal condujo a un aumento de la producción primaria, dominada por algas anuales. La biodiversidad no impulsó significativamente la producción cuando los consumidores fueron manipulados.
Área de la Ciencia:
- Ecología marina ecología marina.
- Ecología de las algas.
- Ecología comunitaria ecología comunitaria.
Sus antecedentes:
- La producción primaria es crucial para los ecosistemas marinos.
- Las interacciones entre el consumidor y los recursos dan forma a la estructura de la comunidad.
- Se debate el papel de la biodiversidad en la función del ecosistema.
Objetivo del estudio:
- Investigar el impacto de la manipulación del consumidor en la producción primaria en la zona baja intermareal.
- Para determinar la relación entre la riqueza de especies y la producción anual.
- Para evaluar la influencia del herbívoro en la dinámica de las comunidades de algas.
Principales métodos:
- Experimentos de campo que manipulan los conjuntos de pastoreo en la zona baja intermareal.
- Monitoreo de la producción primaria y la composición de las especies durante siete años.
- Comparación de las tasas de producción en parcelas manipuladas y de control.
Principales resultados:
- La producción primaria varió significativamente con la presión de pastoreo, alcanzando hasta 86 kg de masa húmeda / m2 / año.
- La reducción del herbívoro condujo al dominio de la alga anual Alaria marginata.
- El aumento de la riqueza de especies no produjo una producción adicional significativa.
Conclusiones:
- La presión del consumidor, no la riqueza de especies, es un motor clave de la producción primaria en este sistema.
- Una especie competitiva superior puede dominar cuando sus enemigos naturales son eliminados.
- Las teorías ecológicas sobre la biodiversidad de los sistemas de consumo-menos no pueden aplicarse a los entornos marinos.
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