AUTUMN AND SPRING WEIGHTS OF SOME PALAEARCTIC MIGRANTS IN CENTRAL NIGERIA

Abstract

SUMMARY During the winters 1963/64 and 1964/65 some 700 weights of 19 species of Palaearctic migrants caught in Central Nigeria were obtained. Where there were adequate weights for analysis, mean weights in the spring were significantly heavier than mean autumn weights; mean weight gains in the spring varied from 47% (Pied Flycatcher) to 21% (Garden Warbler and Spotted Flycatcher). Individual gains were higher.