Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging
Estimating when and where survival bottlenecks occur in free-ranging marine predators is critical for effective demographic monitoring and spatial planning. This is particularly relevant to juvenile stages of long-lived species for which direct observations of death are typically not possible. We us...
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crroyalsociety:10.1098/rsbl.2020.0645 2024-10-13T14:02:29+00:00 Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging Hinke, Jefferson T. Watters, George M. Reiss, Christian S. Santora, Jarrod A. Santos, M. Mercedes Commission for the Conservation of Antarctic Marine Living Resources 2020 http://dx.doi.org/10.1098/rsbl.2020.0645 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2020.0645 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2020.0645 en eng The Royal Society http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Biology Letters volume 16, issue 12, page 20200645 ISSN 1744-9561 1744-957X journal-article 2020 crroyalsociety https://doi.org/10.1098/rsbl.2020.0645 2024-09-17T04:34:44Z Estimating when and where survival bottlenecks occur in free-ranging marine predators is critical for effective demographic monitoring and spatial planning. This is particularly relevant to juvenile stages of long-lived species for which direct observations of death are typically not possible. We used satellite telemetry data from fledgling Adélie, chinstrap and gentoo penguins near the Antarctic Peninsula to estimate the spatio-temporal scale of a bottleneck after fledging. Fledglings were tracked up to 106 days over distances of up to 2140 km. Cumulative losses of tags increased to 73% within 16 days of deployment, followed by an order-of-magnitude reduction in loss rates thereafter. The timing and location of tag losses were consistent with at-sea observations of penguin carcasses and bioenergetics simulations of mass loss to thresholds associated with low recruitment probability. A bootstrapping procedure is used to assess tag loss owing to death versus other factors. Results suggest insensitivity in the timing of the bottleneck and quantify plausible ranges of mortality rates within the bottleneck. The weight of evidence indicates that a survival bottleneck for fledgling penguins is acute, attributable to predation and starvation, and may account for at least 33% of juvenile mortality. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula The Royal Society Antarctic The Antarctic Antarctic Peninsula Biology Letters 16 12 20200645 |
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Open Polar |
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The Royal Society |
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crroyalsociety |
language |
English |
description |
Estimating when and where survival bottlenecks occur in free-ranging marine predators is critical for effective demographic monitoring and spatial planning. This is particularly relevant to juvenile stages of long-lived species for which direct observations of death are typically not possible. We used satellite telemetry data from fledgling Adélie, chinstrap and gentoo penguins near the Antarctic Peninsula to estimate the spatio-temporal scale of a bottleneck after fledging. Fledglings were tracked up to 106 days over distances of up to 2140 km. Cumulative losses of tags increased to 73% within 16 days of deployment, followed by an order-of-magnitude reduction in loss rates thereafter. The timing and location of tag losses were consistent with at-sea observations of penguin carcasses and bioenergetics simulations of mass loss to thresholds associated with low recruitment probability. A bootstrapping procedure is used to assess tag loss owing to death versus other factors. Results suggest insensitivity in the timing of the bottleneck and quantify plausible ranges of mortality rates within the bottleneck. The weight of evidence indicates that a survival bottleneck for fledgling penguins is acute, attributable to predation and starvation, and may account for at least 33% of juvenile mortality. |
author2 |
Commission for the Conservation of Antarctic Marine Living Resources |
format |
Article in Journal/Newspaper |
author |
Hinke, Jefferson T. Watters, George M. Reiss, Christian S. Santora, Jarrod A. Santos, M. Mercedes |
spellingShingle |
Hinke, Jefferson T. Watters, George M. Reiss, Christian S. Santora, Jarrod A. Santos, M. Mercedes Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
author_facet |
Hinke, Jefferson T. Watters, George M. Reiss, Christian S. Santora, Jarrod A. Santos, M. Mercedes |
author_sort |
Hinke, Jefferson T. |
title |
Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
title_short |
Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
title_full |
Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
title_fullStr |
Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
title_full_unstemmed |
Acute bottlenecks to the survival of juvenile Pygoscelis penguins occur immediately after fledging |
title_sort |
acute bottlenecks to the survival of juvenile pygoscelis penguins occur immediately after fledging |
publisher |
The Royal Society |
publishDate |
2020 |
url |
http://dx.doi.org/10.1098/rsbl.2020.0645 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2020.0645 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2020.0645 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Biology Letters volume 16, issue 12, page 20200645 ISSN 1744-9561 1744-957X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1098/rsbl.2020.0645 |
container_title |
Biology Letters |
container_volume |
16 |
container_issue |
12 |
container_start_page |
20200645 |
_version_ |
1812817638351437824 |