Individual variation in migratory path and behavior among Eastern Lark Sparrows

Jeremy D. Ross 1 , Eli S. Bridge 1 , Mark J. Rozmarynowycz 2  and Verner P. Bingman 3
  • 1 Oklahoma Biological Survey, University of Oklahoma, 111 E. Chesapeake Street, Norman, Oklahoma, U.S.A. 73019
  • 2 Department of Biological Sciences, 216 Life Sciences Building, Bowling Green State University, Bowling Green, Ohio, U.S.A. 43403
  • 3 Department of Psychology and J.P. Scott Center for Neuroscience, Mind and Behavior, 255 Psychology Building, Bowling Green State University, Bowling Green, Ohio, U.S.A. 43403


Two general migration strategies prevail among temperate-breeding migratory songbirds of North America. Most “Eastern” birds migrate relatively directly from breeding to wintering grounds immediately after molting, whereas a substantial proportion of “Western” species depart breeding grounds early, and molt during extended migratory stopovers before reaching wintering areas. The Lark Sparrow is one of a few Western Neotropical migrants with a breeding range that extends into regions dominated by Eastern species. We sought to determine whether Eastern Lark Sparrows migrated in a manner consistent with Western conspecifics or follow typical Eastern songbird migratory patterns. To do so, we tracked individual Eastern Lark Sparrows equipped with geolocators between their breeding grounds in Ohio and their unknown wintering locations. Data from three Ohio Lark Sparrows revealed 1) individual variation in the duration and directness of autumn migrations, 2) autumn departures that consistently preceded molt, 3) wintering grounds in the central highlands of Mexico, and 4) brief and direct spring migrations. These observations suggest that eastern populations of prevailingly Western migrants, such as Lark Sparrows, may be behaviorally constrained to depart breeding grounds before molt, but may facultatively adjust migration en route.

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Animal Migration publishes cutting-edge research on the biology of migratory species. It covers all aspects of migratory biology, from genetics and physiology to ecosystem-level interactions between migrants and their environment and everything in between. Migration is a world-wide phenomenon, hence authors from all over the globe are encouraged to submit articles to this OA journal.