Revealing migratory path, important stopovers and non-breeding areas of a boreal songbird in steep decline
Animal Migration
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Abstract
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 Neotropi- cal-Nearctic migrants. Percent land “protected” at Impor- tant 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 dis- tances. 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, accel- erated high-latitude changes, may nonetheless impact boreal breeders.
Suggested Citation
Hagelin, J.C., Hallworth, M.T., Barger, C.P., Johnson, J.A., DuBour, K.A., Pendelton, G.W., DeCicco, L.H., McDuffie, L., Matsuoka, S.M., Snively, M.A., and Marra, P.P., 2021, Revealing migratory path, important stopovers and non-breeding areas of a boreal songbird in steep decline: Animal Migration, v. 8, p. 168-191, https://doi.org/10.1515/ami-2020-0116.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Revealing migratory path, important stopovers and non-breeding areas of a boreal songbird in steep decline |
| Series title | Animal Migration |
| DOI | 10.1515/ami-2020-0116 |
| Volume | 8 |
| Publication Date | December 22, 2021 |
| Year Published | 2021 |
| Language | English |
| Publisher | De Gruyter |
| Contributing office(s) | Alaska Science Center Biology WTEB |
| Description | 24 p. |
| First page | 168 |
| Last page | 191 |
| Country | United States |
| State | Alaska |