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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Population development, breeding biology and behaviour of Tengmalm's Owl near Hof and Munich
Auteurs :	Helmut Meyer, Auteur ; Karl Heinz Gleixner, Auteur ; Siegfried Rudroff, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (37(2) May, 1998)
Article en page(s) :	81-107
Résumé :	In two spruce forest areas near Hof (North Bavaria) and Munich (distance 250 km), populations of Tengmalm's Owl were built up with the aid of nest boxes. The development of the populations was accompanied by trapping and ringing and later also by age determination. Outlines are given for placing Tengmalm's Owl nest boxes. Trapping methods for both sexes are described. For the trapping of malemale a new basket device has been developed and since 1995 preferred to "high net" trapping. Populations developed similarly in both study areas: With the number of boxes the number of broods increased, followed next by saturation and oscillation of numbers. Age composition, determined with the "primaries method" from 1994 to 1996, correlates well with the peak year 1993. Breeding biology data of the 10 forest areas near Hof differ considerably from each other. They seem to imply that areas east of river Sachsische Saale offer better habitat quality than those west of it. Contrary to other German Tengmalm's Owl strongholds, comparison of reproduction rates between nest boxes and holes of Black Woodpecker near Munich shows no significant difference. On average breeding started on April 4 near Hof and on April 12 near Munich. Both study areas showed an earlier onset of breeding as a consequence of rodent mass concentrations in early spring. This, too, was the reason for 2 secondary broods 1996 near Munich, accompanied by acute shortage of femalefemale. In 5 broods the female took part in the rearing of young even after she had left the nest. A case of trigyny near Hof is explained with a maximum availability of nest boxes together with an individual habit of one local male to show courtship behaviour at potential nest sites. All ringing data confirm higher breeding site fidelity in malemale. Locally hatched femalefemale, however, took part in 26% of broods near Munich and only in 1% near Hof.

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