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La concentración de recursos y el herbívoro en los bosques de roble
Resumen
Las larvas de la lombriz de otoño (Alsophila pometaria) preferentemente defoliaron especies de árboles más raros en poblaciones mixtas. Esto contrasta con los hallazgos típicos donde las especies comunes experimentan mayor herbivoría.
Área de la Ciencia:
- Ecología Ecología Ecología.
- Silvicultura La silvicultura es la actividad forestal.
- Entomología Entomología.
Sus antecedentes:
- El gusano del otoño (Alsophila pometaria) es un insecto polifago que defolia las copas de los árboles.
- El tiempo de emergencia de las larvas en relación con el brote de brotes de la planta huésped influye en el herbívoro.
- La composición de las especies de árboles en un soporte puede afectar la presión de los herbívoros.
Objetivo del estudio:
- Para investigar los patrones herbívoros del gusano cancero de otoño (Alsophila pometaria) en parques de roble mixtos.
- Para determinar si el herbívoro por Alsophila pometaria está influenciado por la densidad del árbol huésped o la fenología.
Principales métodos:
- Observaciones de campo en poblaciones mixtas de roble rojo (Quercus coccinea) y roble blanco (Quercus alba).
- Monitoreo de las poblaciones de larvas de Alsophila pometaria y sus asociaciones de árboles huésped.
- Evaluación de los niveles de defoliación en diferentes especies de roble en función de su abundancia relativa.
Principales resultados:
- En los soportes dominados por el roble escarlata, los robles blancos dispersos experimentaron una mayor defoliación por Alsophila pometaria.
- En los stands dominados por el roble blanco, los robles escarlatos dispersos experimentaron una mayor defoliación.
- Las especies de árboles más raros en cada soporte sufrieron mayor herbivoría, al contrario de los modelos de herbivoría dependientes de la densidad.
Conclusiones:
- La Alsophila pometaria herbívora está influenciada por la abundancia relativa y la sincronía fenológica con los árboles huéspedes.
- La asíncronia fenológica entre la eclosión larval y el brote de brotes de las especies más raras impulsa el aumento de la herbivoría.
- Este estudio pone de relieve una relación inversa entre la densidad de la planta huésped y la intensidad de ataque de los herbívoros para Alsophila pometaria.
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