Abstract
The contents of 28 stomachs of the Black-chinned Siskin (Carduelis barbata) were analyzed from an autumn collection from the north of Patagonia. All stomachs contained food. The mean mass was 0.209 g. Eleven items (seven vegetal and four animal) were identified in the samples. The plant fraction was predominant (85.8% in weight) and corresponded to the families Asteraceae, Brassicaceae, Chenopodiaceae and Solanaceae. Camelina microcarpa and Sisymbrium sp. were the more abundant seeds. The animal fraction was represented only by insects (14.2%) in the orders Diptera (larvae) and Homoptera (families Psyllidae and Aphididae). Aphididae was represented by Pterocomma populeum in many samples. Gastroliths were present in all samples, with a mean mass of 0.093 g. The high proportion of insects in the diet of the Black-chinned Siskin is striking considering that it belongs to a family of seed-eaters.
References
BECERRA SERIAL RM Y GRIGERA D (2005) Dinámicaestacional del ensamble de aves de un bosquenorpatagónico de lenga (Nothophagus pumilio) y surelación con la disponibilidad de sustratos de ali-mentación. Hornero 20:131–139
BORRAS A, CABRERA T, CABRERA J Y SENAR JC (2003) Thefood of the citril finch in the Pyrenees and the roleof Pinus seeds as a key resource. Journal ofOrnithology 144:345–353
CRONQUIST A (1993) The evolution and classification of flower-ing plants. New York Botanical Garden, Nueva York
DOLSET ASENSIO FJ (2003) El negrito de Bolivia enlibertad. Ornitología Práctica 3:24–37
ESCOBAR MAH Y VUKASOVIC MA (2001) Depredacióndel Jilguero (Carduelis barbata) sobre larvas dePhoracantha sp. (Coleoptera: Cerambicidae). BoletínChileno de Ornitología 8:21–23

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