Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence?
Abstract We examined the growth rate of the breeding population of king penguins of Crozet archipelago over 41 years. Most colonies showed positive growth rates from the 1960s. However, there was evidence for a decrease in the larger colonies since the early 1990s, and for lower growth rates in the...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1050.3871 2023-05-15T17:03:53+02:00 Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? Karine Delord Ae Christophe Barbraud Henri Weimerskirch The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.3871 http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.3871 http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf text ftciteseerx 2020-04-05T00:28:00Z Abstract We examined the growth rate of the breeding population of king penguins of Crozet archipelago over 41 years. Most colonies showed positive growth rates from the 1960s. However, there was evidence for a decrease in the larger colonies since the early 1990s, and for lower growth rates in the smaller colonies during the 1990s. The overall population size was estimated using log linear models, and the average annual growth rate was +6.3% for the 41-year period. Four change points were detected in the annual growth rate: +21.1% during 1978-1985, +4.3% during 1985-1995, À19.2% during 1995-1999, and +10.9% during 1999-2003. Time-series analyses of the population-size estimates and the relationship between growth rate and population size both indicated density-dependence in population growth rate. Variations in population sizes are also discussed in relation to environmental fluctuations. Our results suggest that important changes occurred over the past 10 years. Text King Penguins Unknown |
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English |
description |
Abstract We examined the growth rate of the breeding population of king penguins of Crozet archipelago over 41 years. Most colonies showed positive growth rates from the 1960s. However, there was evidence for a decrease in the larger colonies since the early 1990s, and for lower growth rates in the smaller colonies during the 1990s. The overall population size was estimated using log linear models, and the average annual growth rate was +6.3% for the 41-year period. Four change points were detected in the annual growth rate: +21.1% during 1978-1985, +4.3% during 1985-1995, À19.2% during 1995-1999, and +10.9% during 1999-2003. Time-series analyses of the population-size estimates and the relationship between growth rate and population size both indicated density-dependence in population growth rate. Variations in population sizes are also discussed in relation to environmental fluctuations. Our results suggest that important changes occurred over the past 10 years. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Karine Delord Ae Christophe Barbraud Henri Weimerskirch |
spellingShingle |
Karine Delord Ae Christophe Barbraud Henri Weimerskirch Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
author_facet |
Karine Delord Ae Christophe Barbraud Henri Weimerskirch |
author_sort |
Karine Delord Ae |
title |
Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
title_short |
Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
title_full |
Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
title_fullStr |
Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
title_full_unstemmed |
Long-term trends in the population size of king penguins at Crozet archipelago: environmental variability and density dependence? |
title_sort |
long-term trends in the population size of king penguins at crozet archipelago: environmental variability and density dependence? |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.3871 http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf |
genre |
King Penguins |
genre_facet |
King Penguins |
op_source |
http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1050.3871 http://www.cebc.cnrs.fr/publipdf/2004/DPB27.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766057833060630528 |