Temporal and Geographic Variation in Survival of Juvenile Black Brant
Abstract First-year survival has important implications for the structure and growth of populations. We examined variation in seasonal survival of first-year Pacific Black Brant (Branta bernicla nigricans) marked late in summer in Alaska at two brood-rearing areas on the Yukon-Kuskokwim Delta (Tutak...
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croxfordunivpr:10.1093/condor/106.2.263 2024-09-15T18:00:17+00:00 Temporal and Geographic Variation in Survival of Juvenile Black Brant Ward, David H. Schmutz, Joel A. Sedinger, James S. Bollinger, Karen S. Martin, Philip D. Anderson, Betty A. 2004 http://dx.doi.org/10.1093/condor/106.2.263 http://academic.oup.com/condor/article-pdf/106/2/263/29712590/condor0263.pdf en eng Oxford University Press (OUP) The Condor volume 106, issue 2, page 263-274 ISSN 0010-5422 1938-5129 journal-article 2004 croxfordunivpr https://doi.org/10.1093/condor/106.2.263 2024-08-27T04:16:56Z Abstract First-year survival has important implications for the structure and growth of populations. We examined variation in seasonal survival of first-year Pacific Black Brant (Branta bernicla nigricans) marked late in summer in Alaska at two brood-rearing areas on the Yukon-Kuskokwim Delta (Tutakoke and Kokechik) and one area on the Arctic Coastal Plain to provide insight into the magnitude and timing of mortality during fall migration. First-year survival was lower in early fall (15 July–1 October), when birds fledged from brood-rearing areas and migrated to their primary fall staging area at Izembek Lagoon, Alaska, than during late fall and early winter (1 October–15 February), when birds made a long-distance transoceanic flight (>5000 km) to wintering areas in Baja California, Mexico. When compared to other years, monthly survival during early fall was 20–24% lower in 1992, the year of latest hatch dates and slowest growth of goslings. There was strong evidence to indicate that survival varied geographically within the early fall period. Monthly survival estimates during early fall were lowest for birds from Tutakoke, highest for birds from the Arctic Coastal Plain, and intermediate at Kokechik. Our findings revealed that most juvenile mortality occurred during the first 2 months following banding, and variation in juvenile survival during this period was likely influenced significantly by environmental parameters and habitat conditions on the breeding grounds. Monthly survival estimates during the subsequent 4 months were similar across geographic areas, and long-distance migration was likely the most important contributor to juvenile mortality during this period. Variación Temporal y Geográfica en la Supervivencia de Juveniles de Branta bernicla nigricans Resumen. La supervivencia durante el primer año de vida tiene implicancias importantes para la estructura y el crecimiento de las poblaciones. Examinamos la variación en la supervivencia estacional en individuos añales de Branta bernicla nigricans ... Article in Journal/Newspaper Branta bernicla Kuskokwim Alaska Yukon Oxford University Press The Condor 106 2 263 274 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract First-year survival has important implications for the structure and growth of populations. We examined variation in seasonal survival of first-year Pacific Black Brant (Branta bernicla nigricans) marked late in summer in Alaska at two brood-rearing areas on the Yukon-Kuskokwim Delta (Tutakoke and Kokechik) and one area on the Arctic Coastal Plain to provide insight into the magnitude and timing of mortality during fall migration. First-year survival was lower in early fall (15 July–1 October), when birds fledged from brood-rearing areas and migrated to their primary fall staging area at Izembek Lagoon, Alaska, than during late fall and early winter (1 October–15 February), when birds made a long-distance transoceanic flight (>5000 km) to wintering areas in Baja California, Mexico. When compared to other years, monthly survival during early fall was 20–24% lower in 1992, the year of latest hatch dates and slowest growth of goslings. There was strong evidence to indicate that survival varied geographically within the early fall period. Monthly survival estimates during early fall were lowest for birds from Tutakoke, highest for birds from the Arctic Coastal Plain, and intermediate at Kokechik. Our findings revealed that most juvenile mortality occurred during the first 2 months following banding, and variation in juvenile survival during this period was likely influenced significantly by environmental parameters and habitat conditions on the breeding grounds. Monthly survival estimates during the subsequent 4 months were similar across geographic areas, and long-distance migration was likely the most important contributor to juvenile mortality during this period. Variación Temporal y Geográfica en la Supervivencia de Juveniles de Branta bernicla nigricans Resumen. La supervivencia durante el primer año de vida tiene implicancias importantes para la estructura y el crecimiento de las poblaciones. Examinamos la variación en la supervivencia estacional en individuos añales de Branta bernicla nigricans ... |
format |
Article in Journal/Newspaper |
author |
Ward, David H. Schmutz, Joel A. Sedinger, James S. Bollinger, Karen S. Martin, Philip D. Anderson, Betty A. |
spellingShingle |
Ward, David H. Schmutz, Joel A. Sedinger, James S. Bollinger, Karen S. Martin, Philip D. Anderson, Betty A. Temporal and Geographic Variation in Survival of Juvenile Black Brant |
author_facet |
Ward, David H. Schmutz, Joel A. Sedinger, James S. Bollinger, Karen S. Martin, Philip D. Anderson, Betty A. |
author_sort |
Ward, David H. |
title |
Temporal and Geographic Variation in Survival of Juvenile Black Brant |
title_short |
Temporal and Geographic Variation in Survival of Juvenile Black Brant |
title_full |
Temporal and Geographic Variation in Survival of Juvenile Black Brant |
title_fullStr |
Temporal and Geographic Variation in Survival of Juvenile Black Brant |
title_full_unstemmed |
Temporal and Geographic Variation in Survival of Juvenile Black Brant |
title_sort |
temporal and geographic variation in survival of juvenile black brant |
publisher |
Oxford University Press (OUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1093/condor/106.2.263 http://academic.oup.com/condor/article-pdf/106/2/263/29712590/condor0263.pdf |
genre |
Branta bernicla Kuskokwim Alaska Yukon |
genre_facet |
Branta bernicla Kuskokwim Alaska Yukon |
op_source |
The Condor volume 106, issue 2, page 263-274 ISSN 0010-5422 1938-5129 |
op_doi |
https://doi.org/10.1093/condor/106.2.263 |
container_title |
The Condor |
container_volume |
106 |
container_issue |
2 |
container_start_page |
263 |
op_container_end_page |
274 |
_version_ |
1810437467393753088 |