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Northeastward reverse migration of birds over Nova Scotia, Canada, in autumn

A radar study

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Summary

During 4 seasons of study, small numbers of birds flew overland to the NNE-E, counter to the main SW migration, intermittently throughout the ‘autumn’ (31 July – 16 November). Radars also detected overwater reverse migration (RM) from New England to Nova Scotia and from Nova Scotia toward Newfoundland. RM occurred at all hours of the day and night, especially when few birds were migrating SW. Most but not all cases of RM occurred with following SW winds. RM was more common with cloud and/or poor visibility than in fair weather, but was not restricted to cloudy occasions. Mean tracks were correlated with wind direction, but were not consistently downwind. Tracks tended to be closer to downwind in early than in late autumn, and on clear than on overcast nights. Dispersion in tracks was not discernibly related to weather variables, time of day or night, or magnetic disturbance. Eleven hypotheses concerning the reasons for reverse migration in autumn are evaluated; cases of RM recorded in this study are attributable to at least three of these hypotheses (late summer dispersal, hurricanes, dawn reorientation toward coast) and possibly to several others.

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  1. environmental research associates, LGL Limited, 44 Eglinton Ave. W., M4R 1A1, Toronto, Ontario, Canada

    W. John Richardson

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Richardson, W.J. Northeastward reverse migration of birds over Nova Scotia, Canada, in autumn. Behav Ecol Sociobiol 10, 193–206 (1982). https://doi.org/10.1007/BF00299685

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  • DOI: https://doi.org/10.1007/BF00299685

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