Comportamiento Alimenticio del Pinzón Vegetariano, Platyspiza crassirostris (Gould, 1837), en la isla Santa Cruz, Galápagos
Fecha
2018
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Facultad de Ciencias Naturales, Universidad de Guayaquil
Resumen
El comportamiento alimenticio en las aves es muy importante para los estudios ecológicos. Uno de los grupos más estudiados de paseriformes son los pinzones de Galápagos, aunque sorprendentemente el conocimiento sobre la ecología y comportamiento de muchas de estas especies no han sido estudiadas a profundidad. En este estudio utilizamos observaciones directas del comportamiento alimenticio para describir la dieta y la amplitud de nicho en la Isla Santa Cruz. Se encontró que Platyspiza crassirostris presentó una dieta generalista oportunista, consumiendo seis categorías distintas de alimento, y utiliza cinco estrategias de forrajeo. Se recalca que el Pinzón vegetariano consume además artrópodos, siendo esta la categoría de alimento que requiere mayor inversión de tiempo. Además, las estrategias principalmente utilizadas fueron engullir y morder que permiten al individuo alimentarse con mayor rapidez, lo que significa que están en riesgo por menos tiempo.
The study of feeding behavior in birds is very important for understanding ecosystems. One of the most studied model passerines are the Galápagos finches, although surprisingly many of the species in this group have not been studied indepth. In this study, we use direct observations of feeding behavior to describe the diet and the niche breadth on Santa Cruz Island. It was found that Platyspiza crassirostris has a generalist diet, consuming six types of food and using five foraging strategies. We highlight that the vegetarian finch also consumes arthropods, even though this prey type requires more time to consume. Also, the main strategies utilized are feeding (ingesting) and biting, which allows individuals to feed faster meaning they are at risk for less time.
The study of feeding behavior in birds is very important for understanding ecosystems. One of the most studied model passerines are the Galápagos finches, although surprisingly many of the species in this group have not been studied indepth. In this study, we use direct observations of feeding behavior to describe the diet and the niche breadth on Santa Cruz Island. It was found that Platyspiza crassirostris has a generalist diet, consuming six types of food and using five foraging strategies. We highlight that the vegetarian finch also consumes arthropods, even though this prey type requires more time to consume. Also, the main strategies utilized are feeding (ingesting) and biting, which allows individuals to feed faster meaning they are at risk for less time.
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Palabras clave
AVES, COMPORTAMIENTO, FORRAJEO, PINZONES, GALÁPAGOS