| Titre : | Clutch and chick losses in model forest-dwelling birds in the West Carpathians. |
| Auteurs : | Miroslav Saniga, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (124(2) 2003) |
| Article en page(s) : | 103-108 |
| Résumé : | From 1983-2001, clutch and chick losses were studied in Capercaillie Tetrao urogallus and from 1989-2001 in Hazel Grouse Bonasa bonasia in the West Carpathians. Clutch and chick losses of other model forest-dwelling bird species were studied in the years 1992-2001. Altogether, 920 nests with clutches and 365 nests with chicks were checked. Out of 847 clutches, 409 (48%) were destroyed. Clutch losses were highest in ground breeders (66%) and lowest in tree-cavity breeders (24%). Out of 365 nests with chicks, 207 (57%) incurred some losses. Chick losses were again highest in ground breeders (71%) and lowest in tree-cavity breeders (44%). Main mammalian predators of eggs and nestlings were Pine Marten Martes martes, Beech Marten Martes foina, mustelids Mustela sp., Red Fox Vulpes vulpes and Lynx Lynx lynx (altogether responsible for 19% of egg losses and 23% of chick losses), while Wild Boar Sus scrofa (6%/4%) and Brown Bear Ursus arctos (2%/1%) were less important. Main avian egg predators were corvid birds, particularly Jay Garrulus glandarius and Raven Corvus corax (together 14%). Avian chick predators in addition to the above mentioned corvids were hawks (Accipiter sp.) and woodpeckers (Dendrocopos sp.) (8%). Nest losses in forest-dwelling birds followed the fluctuation in small rodents with lowest losses during peak vole years (38% of clutches and 45% of nests with chicks) and highest losses during prepeak years (56% resp. 65%) and crash year (53% resp. 68%). |
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