Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation
Abstract We examined the relationship between mass late in the first summer and survival and return to the natal breeding colony for 12 cohorts (1986-1997) of female Black Brant (Branta bernicla nigricans). We used Cormack-Jolly-Seber methods and the program MARK to analyze capture-recapture data. M...
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croxfordunivpr:10.1093/auk/124.4.1281 2023-12-31T10:05:32+01:00 Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation Sedinger, James S. Chelgren, Nathan D. Hepp, G. R. 2007 http://dx.doi.org/10.1093/auk/124.4.1281 http://academic.oup.com/auk/article-pdf/124/4/1281/29692157/auk1281.pdf en eng Oxford University Press (OUP) The Auk volume 124, issue 4, page 1281-1293 ISSN 1938-4254 0004-8038 Animal Science and Zoology Ecology, Evolution, Behavior and Systematics journal-article 2007 croxfordunivpr https://doi.org/10.1093/auk/124.4.1281 2023-12-06T08:49:23Z Abstract We examined the relationship between mass late in the first summer and survival and return to the natal breeding colony for 12 cohorts (1986-1997) of female Black Brant (Branta bernicla nigricans). We used Cormack-Jolly-Seber methods and the program MARK to analyze capture-recapture data. Models included two kinds of residuals from regressions of mass on days after peak of hatch when goslings were measured; one based on the entire sample (12 cohorts) and the other based only on individuals in the same cohort. Some models contained date of peak of hatch (a group covariate related to lateness of nesting in that year) and mean cohort residual mass. Finally, models allowed survival to vary among cohorts. The best model of encounter probability included an effect of residual mass on encounter probability and allowed encounter probability to vary among age classes and across years. All competitive models contained an effect of one of the estimates of residual mass; relatively larger goslings survived their first year at higher rates. Goslings in cohorts from later years in the analysis tended to have lower first-year survival, after controlling for residual mass, which reflected the generally smaller mean masses for these cohorts but was potentially also a result of population-density effects additional to those on growth. Variation among cohorts in mean mass accounted for 56% of variation among cohorts in first-year survival. Encounter probabilities, which were correlated with breeding probability, increased with relative mass, which suggests that larger goslings not only survived at higher rates but also bred at higher rates. Although our findings support the well-established linkage between gosling mass and fitness, they suggest that additional environmental factors also influence first-year survival. Supervivencia y Ventajas Reproductivas de los Pichones de Mayor Tamaño de Branta bernicla nigricans: Variación entre y dentro de las Cohortes Article in Journal/Newspaper Branta bernicla Oxford University Press (via Crossref) The Auk 124 4 1281 1293 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Sedinger, James S. Chelgren, Nathan D. Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
topic_facet |
Animal Science and Zoology Ecology, Evolution, Behavior and Systematics |
description |
Abstract We examined the relationship between mass late in the first summer and survival and return to the natal breeding colony for 12 cohorts (1986-1997) of female Black Brant (Branta bernicla nigricans). We used Cormack-Jolly-Seber methods and the program MARK to analyze capture-recapture data. Models included two kinds of residuals from regressions of mass on days after peak of hatch when goslings were measured; one based on the entire sample (12 cohorts) and the other based only on individuals in the same cohort. Some models contained date of peak of hatch (a group covariate related to lateness of nesting in that year) and mean cohort residual mass. Finally, models allowed survival to vary among cohorts. The best model of encounter probability included an effect of residual mass on encounter probability and allowed encounter probability to vary among age classes and across years. All competitive models contained an effect of one of the estimates of residual mass; relatively larger goslings survived their first year at higher rates. Goslings in cohorts from later years in the analysis tended to have lower first-year survival, after controlling for residual mass, which reflected the generally smaller mean masses for these cohorts but was potentially also a result of population-density effects additional to those on growth. Variation among cohorts in mean mass accounted for 56% of variation among cohorts in first-year survival. Encounter probabilities, which were correlated with breeding probability, increased with relative mass, which suggests that larger goslings not only survived at higher rates but also bred at higher rates. Although our findings support the well-established linkage between gosling mass and fitness, they suggest that additional environmental factors also influence first-year survival. Supervivencia y Ventajas Reproductivas de los Pichones de Mayor Tamaño de Branta bernicla nigricans: Variación entre y dentro de las Cohortes |
author2 |
Hepp, G. R. |
format |
Article in Journal/Newspaper |
author |
Sedinger, James S. Chelgren, Nathan D. |
author_facet |
Sedinger, James S. Chelgren, Nathan D. |
author_sort |
Sedinger, James S. |
title |
Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
title_short |
Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
title_full |
Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
title_fullStr |
Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
title_full_unstemmed |
Survival and Breeding Advantages of Larger Black Brant (Branta Bernicla Nigricans) Goslings: Within- and Among-Cohort Variation |
title_sort |
survival and breeding advantages of larger black brant (branta bernicla nigricans) goslings: within- and among-cohort variation |
publisher |
Oxford University Press (OUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1093/auk/124.4.1281 http://academic.oup.com/auk/article-pdf/124/4/1281/29692157/auk1281.pdf |
genre |
Branta bernicla |
genre_facet |
Branta bernicla |
op_source |
The Auk volume 124, issue 4, page 1281-1293 ISSN 1938-4254 0004-8038 |
op_doi |
https://doi.org/10.1093/auk/124.4.1281 |
container_title |
The Auk |
container_volume |
124 |
container_issue |
4 |
container_start_page |
1281 |
op_container_end_page |
1293 |
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1786837164610289664 |