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Título
Diet and grit characteristics in young Eurasian Bullfinches (Pyrrhula pyrrhula) inhabiting Iberian hedgerows
Autor
Año del Documento
2022
Editorial
BirdLife
Descripción
Producción Científica
Documento Fuente
Ornis Fennica, 2022, vol. 99, n. 4, p. 163–183
Zusammenfassung
For the first time, the diet of young Iberian Bullfinches (Pyrrhula pyrrhula iberiae)
is studied, specifically in a hedgerow habitat in northwestern Spain, through stomach
(younger nestlings up to 8 days of age, which died without researcher intervention) and
faecal sac (older nestlings) analysis, and secondarily direct observation (nestlings and
dependent juveniles). Also, for the first time, grit use by bullfinch nestlings is described
in some detail. Bullfinches fed their young with a mixture of seeds and invertebrates,
with greater quantitative importance of the former. The identity of the seeds varied
considerably between spring and summer, and animal fraction gradually decreased from
May to July for older nestlings, in both cases presumably because of the seasonal changes
in food availability. Caterpillars and spiders were the most important arthropod prey in
the diet. Apparently, the young were not fed non-arthropod invertebrates. The relative
importance of invertebrates, which are very rich in proteins, was greater for younger
nestlings than for older ones. Difficult to digest hard-bodied prey, such as beetles, were
not present in the stomachs of the youngest nestlings. The frequency of occurrence and
amount of grit in stomachs increased with nestling age, along with the need to grind
food. There were no remarkable differences in number of units, size, or number of colour
types of gastroliths between months. The high floristic diversity in the study area, which
has great overall conservation value, provides a wide range of resources for bullfinches,
including plenty of food for their young.
Materias Unesco
2401.20 Ornitología
2401.02 Comportamiento Animal
Palabras Clave
Grit characteristics
Hedgerows
Nestling diet
Pyrrhula pyrrhula
ISSN
0030-5685
Revisión por pares
SI
Version del Editor
Propietario de los Derechos
© El autor
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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