The influence of predators on the consumption of Crataegus monogyna fuits by Blackbirds and thruses

Authors: GUITIÁN, J., MUNILLA, I. and GUITIÁN, P.

Published: Volume 41(1), June 1994. Pages 45-54.

Language: Spanish

Original Title: Influencia de los depredadores de aves en el consumo de frutos de Crataegus monogyna por zorzales y mirlos

Keywords: avian seed dispersal, Crataegus monogyna, fruits, predation and Scotland.

Summary:

The behaviour of Redwings and Blackbirds feeding on hawthorn berries along two hedgerows in southern Scotland was studied. Hedgerow A runs alonside a heavily frequented path, so that birds are continuously disturbed by people ("predators"). Hedgerow B is undisturbed. Birds feeding along hedgerow A carried more fruits away to eat under the cover of nearby trees, and the mean number of fruits ingested in each feeding bout was lower. Fruit and seed fall along hedgerow A in 1990 and 1992 were also studied. In 1992 fruits and seeds were most abundant on the ground close to nearby trees (i.e. safe shelters). In 1992, however, the pattern of abundance of fruits and seeds on the ground reflected the pattern of abundance in the hedgerow, not the proximity of safe shelters.

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