Authors: CÁRDENAS, A. M., TORRES, J. A. and BACH, C.
Published: Volume 30(1), June 1983. Pages 33-44.
Language: Spanish
Original Title: Estudio comparado del régimen alimentario de Acrocephalus arundinaceus y A. scirpaceus en la laguna de Zoñar
Summary:
A comparative study of the alimentary diet of A. arundinaceus and A. scirpaceus was made in Zóñar pond (Aguilar de la Frontera, Córdoba, Spain). Stomach samples were obtained using tbe emetic method as modified by MOODY (1970). The results show that both species, A. arundinaceus and A. scirpaceus, are insectivorous. For the A. scirpaceus the most abundant prey were Coleopterous, Dipterous and Hymenopterous, and Coleopterous. Hymenoperous, Dipterous and Hemipteran for the A. arundinaceus. There was also a small contríbution of vegetal material and solid particles in the alimentary diet. The diet's structure was established using two parameters: frecuency and constancy, and can be classified into three groups. The Coleopterous were included in the first group of both species, A. arundinaceus and A. scirpaceus; Dipterous and Hymenopterous were included in the second group in A. arundinaceus, and these two orders and Hemipteran in A. scirpaceus. The remaining categories were considered rare prizes (group third) for both species. The total diversity of the diet was the same for both Acrocephalus. The ZARET and RAND coefficient showed a 50 % overlap in the diets.
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