Efectos de la calidad del alimento en la tucura Dichroplus pratensist Bruner (Orthoptera: Acrididae)

Patricia C. Pereyra, Norma E. Sánchez, María L. de Wysiecki


Los acridios están frecuentemente asociados a plantas que sufren estrés hidrico y térmico, en pastizales con sequías estacionales marcadas. El objetivo de este trabajo fue evaluar el efecto de hojas de maíz, Zea mays, sometidas a marchitamiento artificial, en el comportamiento alimentario, la supervivencia y la fecundidad de Dichroplus pratensls en laboratorio. Se utilizaron hojas turgentes y hojas marchitas para evaluar la preferencia alimentaria, tasas de consumo, crecimiento y eficiencia de conversión de alimento. Se computó la supervivencia diaria, la duración del 5to estadio ninfal, el período de preoviposición y la fecundidad en hembras criadas con ambos tipos de alimentos.
Tanto ninfas de 5to estadio como adultos mostraron una marcada preferencia por el alimento marchito. Las ninfas alimentadas con hojas marchitas crecieron y consumieron más que las alimentadas con hojas turgentes. En los adultos, hubo una mayor tendencia al consumo de alimento marchito, sin embargo, no se hallaron diferencias entre alimentos para la tasa de crecimiento relativo. No hubo tampoco diferencias entre tratamientos en la supervivencia, duración del 5to estadio ninfal, período de preoviposición y fecundidad.

Palabras clave

Dichroplus pratensis, acridios, calidad del alimento, preferencia alimentaria

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