Summary
Amount of predation by Falco eleonorae on trans-mediterranean migrants
About 2000 pairs ofFalco eleonorae breed on Mediterranean (and Atlantic) islands. These 4000 adults rear approximately 4000 young during the latter stages of the autumn migration. The author tries to calculate the number of migratory birds on which the Falcons prey in the last 60 days of their stay in the Palearctic region. He supposes the mean weight of the favourite prey to be 20 grams and the daily amount of food 80 grams and thus calculates that 1.750.000 birds of the size of a Nightingale serve annually as food for these Falcons during the period August 25 to October 25.Moreau (1961) estimated the number of Palearctic migrants crossing the Mediterranean sea to be about 600 millions. If this figure should be nearly correct, more than one out of every 600 migrants becomes a victim ofFalco eleonorae.
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Literatur
Heinroth, O. u. M. (1927): Die Vögel Mitteleuropas. Band II. Berlin-Lichterfelde.
Moreau, R. E. (1961): Problems of Mediterranean-Saharan migration — Ibis 103 a, p. 373–427, 580–623.
Slijper, H. J. (1960): Enkele gegevens over het gewicht en de dagelijke voedselhoevelheid van den Torenvalk(Falco tinnunculus) — Limosa 33, p. 54–56.
Stresemann, E. (1943): Überblick über die Vögel Kretas und den Vogelzug in der Aegaeis — J. f. Orn. 91, p. 448–514.
Walter, H. (1968): Zur Abhängigkeit der Eleonorenfalken(Falco eleonorae) vom mediterranen Vogelzug — J. f. Orn. 109, p. 323–365.
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Stresemann, E. Der Eingriff der Eleonorenfalken in den herbstlichen Vogelzug. J Ornithol 109, 472–474 (1968). https://doi.org/10.1007/BF01671583
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DOI: https://doi.org/10.1007/BF01671583