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DIET-ANALYSES OF THE LARGE WHITE-RUMPED SWIFT, APUS PACIFICUS, AT CHENLUSHAN ISLAND IN THE YELLOW SEA AND EXAMINATION OF THEIR PATTERN OF ACTIVITIESBY RADAR

CHENG ZHAOQIN ZHOU BENXIANG(Department of Biology. East China Normal University, Shanghai)  
We made observation concerning habituation of the breeding population and pattern of activities in the nesting area of Large White-rumped swifts, Apus p. pacificus, breeding at Chenlu-shan Island in the Yellow Sea from May to August in 1980, and July in 1981. Results of diet-analyses showed that they fed on insects belonging to nine different orders. Most of the insects consumed were harmful to agriculture and forests. The authors also examined the pattern of activities of the swifts by radar. Their pattern of activities was different from that of other insect-eating birds. Their pattern of activities was found to be related to insects. We found that there were relationships between the diet of the swifts and the insect populations in the air. Hence through studies of the pattern of activities of the swifts in their nesting area, we were in a better position to understand ecological characteristics of the migration of insects and the pattern of activities of the swifts under study.
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