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Effects of Weather on Nocturnal Migration as Seen from One Observation Point at Philadelphia

Joseph M. Devlin
The Wilson Bulletin
Vol. 66, No. 2 (Jun., 1954), pp. 93-101
Stable URL: http://www.jstor.org/stable/4158286
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Weather on Nocturnal Migration as Seen from One Observation Point at Philadelphia
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Abstract

By keeping a close watch for migrants in some small park in a large city one is able to determine the nights of migration. When it is known on what nights birds are in flight, the appropriate correlations with weather can be made. The writer has been interested in this sort of observational research and has used the Botany Garden on the campus of the University of Pennsylvania for the field work. In the spring of 1953 it was found that the majority of migrants arrived on southerly winds or on temperate calm nights. Relatively few birds came in on nights with northerly winds.

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