The effect of poisoning on the movement of rooks Corvus frugilegus L. in southern hawke's Bay, New Zealand

摘要: Abstract The effect of poison bait at a rookery on the movement rooks (Corvus frugilegus L.) was studied using marking and radiotelemetry five rookeries in southern Hawke's Bay, New Zealand. In November 1987 1988, before poisoning, were retrapped near other than those where they marked, showing that feeding areas overlapped. Birds marked located north north-east original 1988. spite extensive searches throughout study area, no southward seen. Between July 12 moved to south-east direction. Poisoning DRC-1339, killed 38 rooks, including 10 birds 4 rookeries. At least six one with transmitter survived, as well three transmitters released after poisoning. These seen 1989, 2 3 km sout...