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BY-NC-ND 4.0 license Open Access Published by De Gruyter Open Access December 22, 2021

Revealing migratory path, important stopovers and non-breeding areas of a boreal songbird in steep decline

  • Julie C. Hagelin , Michael T. Hallworth , Christopher P. Barger , James A. Johnson , Kristin A. DuBour , Grey W. Pendelton , Lucas H. DeCicco , Laura A. McDuffie , Steven M. Matsuoka , Marian A. Snively , Peter P. Marra and Audrey Taylor
From the journal Animal Migration


The Olive-sided Flycatcher (Contopus cooperi) is a steeply declining aerial insectivore with one of the longest migrations of any North American passerine. We deployed light-level geolocators and archival GPS tags on breeders in boreal Alaska to determine migratory routes, important stopovers and non-breeding locations. Data from 16 individuals revealed a median 23,555 km annual journey (range: 19,387, 27,292 km) over 95 days (range: 83, 139 days) with wintering occurring in three regions of South America (NW Colombia/Ecuador, central Peru and W Brazil/S Peru). We developed a new method to identify “Important Stopovers” by quantifying intensity of use (a function of bird numbers and stop durations) along migratory routes. We identified 13 Important Stopovers that accounted for ~66% of the annual migratory period, suggestive of refueling activities. Some sites coincided with key areas previously identified for other Neotropical-Nearctic migrants. Percent land “protected” at Important Stopovers, as defined by IUCN, ranged from 3.8% to 49.3% (mean [95% CI]: 17.3% [9.6, 25.0]). Total migration speed did not differ by season (median: 255 km day-1, range: 182, 295km day-1), despite greater spring travel distances. Birds with longer non-breeding periods, however, migrated north faster. Climate-driven mismatches in migratory timing may be less of a concern for western than for eastern flycatcher populations, given recent con-generic analyses (C. sordidulus, C. virens). However, accelerated high-latitude changes, may nonetheless impact boreal breeders.


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Received: 2021-10-14
Accepted: 2021-11-01
Published Online: 2021-12-22

© 2021 Julie C. Hagelin et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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