Author/Editor     Denac, Damijan
Title     Chick shelters did not prevent raptor predation on chiks in a mixed common tern Sterna hirundo and black-headed gull Larus ridibundus colony in Slovenia
Type     članek
Source     Vogelwelt
Vol. and No.     Letnik 127, št. 3
Publication year     2006
Volume     str. 187-91
Language     eng
Abstract     Predation is a serious threat to colonial waierbirds, especially in managed colonies for conservation of threatened species. While the effectiveness of a simple antipredator measure, the placing of chick shelters, has been tested against gulls, there are few studies on their effectiveness abainst raptor predation. The quantified protective effect of chick shelters abainst raptor predation in a mixed Common Tern and Black-headed Gull colony is now reported. Three identical artificial breeding rafts were equipped with different numbers of chick shelters. All chicks were observed to be subject to predaiion by Goshawk Accipiter gentilis, with an intensity independent of the presence or number of chick shelters, indicating that they offered uo protective function. 1VIore sophisticated protective measures are thus needed to control raptor predation in a managed colony.
Descriptors     BIRDS
PREDATORY BEHAVIOR
ANIMAL NUTRITION
CHICKENS
SLOVENIA