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Title: Migratory stopover timing is predicted by breeding latitude, not habitat quality, in a long-distance migratory songbird

The timing of migration can have important survival impacts, as birds must synchronize their movements with favourable environmental conditions to reach their destination. The timing of arrival at and duration of migratory stopover may be largely governed by environmental conditions experienced en route as well as by endogenous factors, but our understanding of these processes is limited. We used light-level geolocators to collect start-to-finish spatio-temporal migration data for a declining aerial insectivore, the Purple Martin ( Progne subis), that travels seasonally between North and South America. Using data obtained for birds originating from range-wide breeding populations, our objectives were to test intrinsic and extrinsic hypotheses for migration stopover duration as well as to identify important stopover regions during fall migration. We examined whether breeding latitude, fall migration timing, age, sex or habitat quality at stopover sites (measured using Normalized Difference Vegetation Index) influenced the duration of stopovers. We found that most individuals rely on the eastern coast of the Yucatan Peninsula, Honduras, and Nicaragua for stopovers during fall migration, where duration ranged from 1 to 36 days (average 6.8 ± 8.2). Stopovers in these regions were later and of longer duration for more northern breeding populations. Only breeding latitude predictedmore » stopover duration, and not habitat quality at stopovers, lending support to the hypothesis that duration is prescribed by endogenous factors. Lastly, the important core stopover regions we documented could be targeted for conservation efforts, particularly for steeply-declining, more northern breeding populations that have greater stopover duration in these areas.« less
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1]
  1. Univ. of Manitoba, Winnipeg (Canada)
  2. Consolidated Nuclear Security, LLC, Amarillo, TX (United States)
  3. Disney's Animals Science and Environment, Lake Buena Vista, FL (United States)
  4. Ellis Bird Farm, Lacombe (Canada)
  5. Univ. of Alberta, Camrose (Canada)
  6. Woodbridge (United States)
  7. Mille Lacs Band of Ojibwe, Onamia, MN (United States)
Publication Date:
Report Number(s):
PX-2209
Journal ID: ISSN 2193-7192
Grant/Contract Number:
NA0001942
Type:
Accepted Manuscript
Journal Name:
Journal of Ornithology
Additional Journal Information:
Journal Volume: 158; Journal Issue: 3; Journal ID: ISSN 2193-7192
Publisher:
Journal of Ornithology
Research Org:
Pantex Plant (PTX), Amarillo, TX (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; migration phenology; migration behavior; aerial insectivore; direct tracking; geolocator
OSTI Identifier:
1410338

Loon, A. Van, Ray, J. D., Savage, A., Mejeur, J., Moscar, L., Pearson, M., Pearman, M., Hvenegaard, G. T., Mickle, N., Applegate, K., and Fraser, Kevin C.. Migratory stopover timing is predicted by breeding latitude, not habitat quality, in a long-distance migratory songbird. United States: N. p., Web. doi:10.1007/s10336-017-1435-x.
Loon, A. Van, Ray, J. D., Savage, A., Mejeur, J., Moscar, L., Pearson, M., Pearman, M., Hvenegaard, G. T., Mickle, N., Applegate, K., & Fraser, Kevin C.. Migratory stopover timing is predicted by breeding latitude, not habitat quality, in a long-distance migratory songbird. United States. doi:10.1007/s10336-017-1435-x.
Loon, A. Van, Ray, J. D., Savage, A., Mejeur, J., Moscar, L., Pearson, M., Pearman, M., Hvenegaard, G. T., Mickle, N., Applegate, K., and Fraser, Kevin C.. 2017. "Migratory stopover timing is predicted by breeding latitude, not habitat quality, in a long-distance migratory songbird". United States. doi:10.1007/s10336-017-1435-x. https://www.osti.gov/servlets/purl/1410338.
@article{osti_1410338,
title = {Migratory stopover timing is predicted by breeding latitude, not habitat quality, in a long-distance migratory songbird},
author = {Loon, A. Van and Ray, J. D. and Savage, A. and Mejeur, J. and Moscar, L. and Pearson, M. and Pearman, M. and Hvenegaard, G. T. and Mickle, N. and Applegate, K. and Fraser, Kevin C.},
abstractNote = {The timing of migration can have important survival impacts, as birds must synchronize their movements with favourable environmental conditions to reach their destination. The timing of arrival at and duration of migratory stopover may be largely governed by environmental conditions experienced en route as well as by endogenous factors, but our understanding of these processes is limited. We used light-level geolocators to collect start-to-finish spatio-temporal migration data for a declining aerial insectivore, the Purple Martin (Progne subis), that travels seasonally between North and South America. Using data obtained for birds originating from range-wide breeding populations, our objectives were to test intrinsic and extrinsic hypotheses for migration stopover duration as well as to identify important stopover regions during fall migration. We examined whether breeding latitude, fall migration timing, age, sex or habitat quality at stopover sites (measured using Normalized Difference Vegetation Index) influenced the duration of stopovers. We found that most individuals rely on the eastern coast of the Yucatan Peninsula, Honduras, and Nicaragua for stopovers during fall migration, where duration ranged from 1 to 36 days (average 6.8 ± 8.2). Stopovers in these regions were later and of longer duration for more northern breeding populations. Only breeding latitude predicted stopover duration, and not habitat quality at stopovers, lending support to the hypothesis that duration is prescribed by endogenous factors. Lastly, the important core stopover regions we documented could be targeted for conservation efforts, particularly for steeply-declining, more northern breeding populations that have greater stopover duration in these areas.},
doi = {10.1007/s10336-017-1435-x},
journal = {Journal of Ornithology},
number = 3,
volume = 158,
place = {United States},
year = {2017},
month = {2}
}