Mortality of Bled Birds as Indicated by Recapture Rate

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Abstract
Wild birds were caught in mistnets and banded over a period of three years. A small blood sample (0.2 cc) was removed from many individuals of the more commonly captured spp., while other individuals of the same sp. were released without being bled. To determine whether the bled birds which were released suffered an increased amount of mortality compared with the birds which had not been bled, the recapture rates of the 2 groups were compared. Data from 15 spp., varying in size from black-capped chickadee to blue jay, failed to demonstrate that bleeding depressed recapture rate in any single sp. Data pooled by family, however, showed that the recapture rate of 4 fringillids, when analyzed as a group, was significantly depressed by bleeding.

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