Effect of the cereal harvest and causes of reproductive failure in a breeding population of Montagu's Harrier (Circus pygargus L.) in the SE of Ciudad Real (central Spain).

Authors: CASTAÑO, J. P.

Published: Volume 42(2), December 1995. Pages 167-172.

Language: Spanish

Original Title: Efecto de la actividad de siega y causas de fracaso reproductivo en una población de Aguilucho Cenizo (Circus pygargus L.) en el SE de Ciudad Real

Keywords: Circus pygargus, harvest, Montagu's Harrier, mortality causes and reproduction

Summary:

Causes of clutch loss and nestling mortality have been studied in 134 nests of Montagu's Harrier in the SE of Ciudad Real (central Spain) during 1988-1994. In this area, Montagu's Harriers nest in cultivated lands (mainly cereal crops). Clutch loss affected up to 18% of nests. Nestling mortality affected up to 47% of chicks. The main cause of breeding failure in this population was cereal harvesting. Harvest mortality has been estimated about 70% of nestlings in this area when no protection activities are conducted. Relationships between mortality, type of crop used for nesting and date of breeding are discussed.

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