Artikel-Suche

Patrick Scherler, Valentijn van Bergen, Benedetta Catitti, Urs Kormann, Stephanie Witczak, Melanie Andereggen, Jana S. Herzog, Adrian Aebischer, Nicolas Roth, Martin U. Grüebler

Brutbiologie des Rotmilans Milvus milvus in den Westschweizer Voralpen.

2023

120

276–292

Key words
(von 1994 bis 2006 vergeben)

Brutbiologie, Brutpflege, Nestbaum, Nestbau, Gelegegrösse, Flüggewerden, Bruterfolg

Schlagwort_Vogelart
(wissenschaftlich)

Corvus corone, Milvus milvus, Accipiter gentilis, Bubo bubo

Schlagwort_Vogelart
(deutsch)

Rabenkrähe, Rotmilan, Habicht, Uhu

Sensebezirk, Freiburg, Gantrisch, Bern

deutsch

Abhandlung

Breeding biology of the Red Kite Milvus milvus in the foothills of the Alps of Western Switzerland. – Reproduction is a central element in the life of birds: it directly determines fitness. Gathering information on the reproductive biology and performance of individuals and populations is, therefore, the basis for answering many ecological, evolutionary, and management-relevant questions. We present a comprehensive overview of the breeding biology parameters of a population of Red Kites in western Switzerland, collected between 2015 and 2020. We group these parameters as (1) breeding population metrics (e.g., brood density, nest turnover, partner fidelity), (2) pre-hatching metrics (e.g., nest-tree characteristics, nesting behaviour, egg-laying phenology, clutch sizes), and (3) post-hatching metrics (e.g., brood care, fledging dates, diet, breeding success, productivity). The results show that the study region harbours one of the highest breeding densities of the species worldwide. The breeding success of pairs was about average, compared to other populations, and we observed strong annual variation in the proportion of pairs without breeding attempt. The diet of nestlings consisted of a considerable proportion of items of anthropogenic origin. Our data provide an important base for comparative studies and further investigation on the mechanisms underlying the observed patterns.