Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway
For most shorebird species, our understanding of the basic limiting factors and when or where they operate during the annual cycle is currently inadequate to either understand ongoing declines or effectively allocate conservation resources for recovery. Whimbrels (Numenius phaeopus) exhibit delayed...
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ftbioone:10.1093/condor/duy001 2024-06-02T08:12:23+00:00 Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard world 2019-02-05 text/HTML https://doi.org/10.1093/condor/duy001 en eng American Ornithological Society doi:10.1093/condor/duy001 All rights reserved. https://doi.org/10.1093/condor/duy001 Text 2019 ftbioone https://doi.org/10.1093/condor/duy001 2024-05-07T00:52:57Z For most shorebird species, our understanding of the basic limiting factors and when or where they operate during the annual cycle is currently inadequate to either understand ongoing declines or effectively allocate conservation resources for recovery. Whimbrels (Numenius phaeopus) exhibit delayed recruitment and have low fecundity, and populations with such life-history traits are often vulnerable to increases in adult mortality. We tracked 33 adult Whimbrels with satellite transmitters for 12,802 bird-days to investigate patterns in survival and recorded 16 probable and 5 confirmed mortalities. We used Cox's proportional hazards model to estimate daily hazard rates by season and a Kaplan-Meier product limit estimator to estimate monthly survival. Daily hazard rates varied by season and were 5 times higher during migratory periods (fall and spring migration) compared to stationary periods (winter and breeding). Estimated annualized survivorship was 0.54 ± 0.21 (SE) and on the lower end of the range of 0.8–0.9 believed to be required to maintain a stable population. More than half of the mortality recorded during the study occurred during the fall hunting season and within the last remaining area throughout the Western Hemisphere where significant legal and illegal hunting occurs. One-third of mortality occurred during spring migration either within terminal staging sites or as birds made final movements to breeding grounds. Survival during the migratory periods may have been influenced by the use of transmitters. Text Numenius phaeopus BioOne Online Journals Meier ENVELOPE(-45.900,-45.900,-60.633,-60.633) The Condor 121 1 |
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BioOne Online Journals |
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English |
description |
For most shorebird species, our understanding of the basic limiting factors and when or where they operate during the annual cycle is currently inadequate to either understand ongoing declines or effectively allocate conservation resources for recovery. Whimbrels (Numenius phaeopus) exhibit delayed recruitment and have low fecundity, and populations with such life-history traits are often vulnerable to increases in adult mortality. We tracked 33 adult Whimbrels with satellite transmitters for 12,802 bird-days to investigate patterns in survival and recorded 16 probable and 5 confirmed mortalities. We used Cox's proportional hazards model to estimate daily hazard rates by season and a Kaplan-Meier product limit estimator to estimate monthly survival. Daily hazard rates varied by season and were 5 times higher during migratory periods (fall and spring migration) compared to stationary periods (winter and breeding). Estimated annualized survivorship was 0.54 ± 0.21 (SE) and on the lower end of the range of 0.8–0.9 believed to be required to maintain a stable population. More than half of the mortality recorded during the study occurred during the fall hunting season and within the last remaining area throughout the Western Hemisphere where significant legal and illegal hunting occurs. One-third of mortality occurred during spring migration either within terminal staging sites or as birds made final movements to breeding grounds. Survival during the migratory periods may have been influenced by the use of transmitters. |
author2 |
Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard |
format |
Text |
author |
Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard |
spellingShingle |
Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
author_facet |
Bryan D. Watts Fletcher M. Smith Diana J. Hamilton Tim Keyes Julie Paquet Lisa Pirie-Dominix Jennie Rausch Barry Truitt Brad Winn Paul Woodard |
author_sort |
Bryan D. Watts |
title |
Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
title_short |
Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
title_full |
Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
title_fullStr |
Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
title_full_unstemmed |
Seasonal variation in mortality rates for Whimbrels (Numenius phaeopus) using the Western Atlantic Flyway |
title_sort |
seasonal variation in mortality rates for whimbrels (numenius phaeopus) using the western atlantic flyway |
publisher |
American Ornithological Society |
publishDate |
2019 |
url |
https://doi.org/10.1093/condor/duy001 |
op_coverage |
world |
long_lat |
ENVELOPE(-45.900,-45.900,-60.633,-60.633) |
geographic |
Meier |
geographic_facet |
Meier |
genre |
Numenius phaeopus |
genre_facet |
Numenius phaeopus |
op_source |
https://doi.org/10.1093/condor/duy001 |
op_relation |
doi:10.1093/condor/duy001 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1093/condor/duy001 |
container_title |
The Condor |
container_volume |
121 |
container_issue |
1 |
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1800758800516382720 |