Comparison of body mass, body mass increase, stop-over residence time and abundance of the Sedge Warbler Acrocephalus schoenobaenus between two areas of the Txingudi marsh (northern Spain).

Authors: GRANDÍO, J. M.

Published: Volume 45(2), December 1998. Pages 137-142.

Language: Spanish

Original Title: Comparación del peso y su incremento, del tiempo de estancia y de la abundancia del Carricerín Común (Acrocephalus schoenobaenus) entre dos zonas de la marisma de Txingudi (N de España).

Keywords: aphid abundance, autumn migration, body mass increase, Iberian Peninsula, reed beds, Sedge Warbler and stopover residence times.

Summary:

This work compares the body mass, its rates of increase, the stop-over residence time and the abundance of Sedge Warblers during the autumn migration between two reed beds in which there was a strong diference on the density of aphids (2640 aphids/plant vs. 235 aphids/plant). The body mass of the birds captured in the area with the largest aphid abundance was higher (12.8 g vs. 11.1 g) than in the area with less aphids. The daily body mass increase of these birds (0.96 g/day and 0.46 g/day for the reed beds with large and small aphid abundance, respectively) was similar to the daily body mass increases reported for other areas considered as critical for the migration of this species. The stop-over residence times were shorter in the reed bed with the larger aphid abundance (3.0 days vs. 4.9 days). These results demonstrate the importance of the study area for the autumn migration of this species, as well as a likely effect of small-scale differences in food abundance for this migration.

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