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Title |
Spatial Heterogeneity as a Genetic Mixing Mechanism in Highly Philopatric Colonial Seabirds |
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Journal |
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Year |
2015 |
Publication |
PLOS ONE |
Abbreviated Journal |
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Volume |
10 |
Issue |
2 |
Pages |
e0117981 |
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Keywords |
Animal sexual behavior Animal sociality Birds Inbreeding Penguins Population genetics Seabirds Spatial autocorrelation |
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Abstract |
How genetic diversity is maintained in philopatric colonial systems remains unclear, and understanding the dynamic balance of philopatry and dispersal at all spatial scales is essential to the study of the evolution of coloniality. In the King penguin, Aptenodytes patagonicus, return rates of post-fledging chicks to their natal sub-colony are remarkably high. Empirical studies have shown that adults return year after year to their previous breeding territories within a radius of a few meters. Yet, little reliable data are available on intra- and inter-colonial dispersal in this species. Here, we present the first fine-scale study of the genetic structure in a king penguin colony in the Crozet Archipelago. Samples were collected from individual chicks and analysed at 8 microsatellite loci. Precise geolocation data of hatching sites and selective pressures associated with habitat features were recorded for all sampling locations. We found that despite strong natal and breeding site fidelity, king penguins retain a high degree of panmixia and genetic diversity. Yet, genetic structure appears markedly heterogeneous across the colony, with higher-than-expected inbreeding levels, and local inbreeding and relatedness hotspots that overlap predicted higher-quality nesting locations. This points towards heterogeneous population structure at the sub-colony level, in which fine-scale environmental features drive local philopatric behaviour, while lower-quality patches may act as genetic mixing mechanisms at the colony level. These findings show how a lack of global genetic structuring can emerge from small-scale heterogeneity in ecological parameters, as opposed to the classical model of homogeneous dispersal. Our results also emphasize the importance of sampling design for estimation of population parameters in colonial seabirds, as at high spatial resolution, basic genetic features are shown to be location-dependent. Finally, this study stresses the importance of understanding intra-colonial dispersal and genetic mixing mechanisms in order to better estimate species-wide gene flows and population dynamics. |
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1932-6203 |
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1932-6203 |
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yes |
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6695 |
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Title |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins.
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Type |
Journal Article |
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Year |
2014 |
Publication |
PloS one |
Abbreviated Journal |
1932-6203 |
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Volume |
9 |
Issue |
12 |
Pages |
e114052-e114052 |
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137 |
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Public Library of Science |
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1932-6203 |
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yes |
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5848 |
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![find book details (via ISBN) isbn](img/isbn.gif)
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Title |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
Type |
Journal |
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Year |
2014 |
Publication |
PLOS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
12 |
Pages |
e114052 |
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Keywords |
Animal sexual behavior Animal sociality Birds Foraging Ocean temperature Penguins Seasons Sex ratio |
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137 |
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1932-6203 |
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1932-6203 |
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yes |
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6693 |
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Title |
Age-Related Mercury Contamination and Relationship with Luteinizing Hormone in a Long-Lived Antarctic Bird
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Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
7 |
Pages |
e103642- |
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109 |
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Public Library of Science |
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1932-6203 |
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yes |
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Call Number |
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Serial |
5100 |
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Title |
Emperors in Hiding: When Ice-Breakers and Satellites Complement Each Other in Antarctic Exploration
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Type |
Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
6 |
Pages |
e100404- |
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Abstract |
Evaluating the demographic trends of marine top predators is critical to understanding the processes involved in the ongoing rapid changes in Antarctic ecosystems. However, the remoteness and logistical complexity of operating in Antarctica, especially during winter, make such an assessment difficult. Satellite imaging is increasingly recognised as a valuable method for remote animal population monitoring, yet its accuracy and reliability are still to be fully evaluated. We report here the first ground visit of an emperor penguin colony first discovered by satellite, but also the discovery of a second one not indicated by satellite survey at that time. Several successive remote surveys in this coastal region of East Antarctica, both before and after sudden local changes, had indeed only identified one colony. These two colonies (with a total of ca. 7,400 breeding pairs) are located near the Mertz Glacier in an area that underwent tremendous habitat change after the glacier tongue broke off in February 2010. Our findings therefore suggest that a satellite survey, although offering a major advance since it allows a global imaging of emperor penguin colonies, may miss certain colony locations when challenged by certain features of polar ecosystems, such as snow cover, evolving ice topology, and rapidly changing habitat. Moreover our survey shows that this large seabird has considerable potential for rapid adaptation to sudden habitat loss, as the colony detected in 2009 may have moved and settled on new breeding grounds. Overall, the ability of emperor penguin colonies to relocate following habitat modification underlines the continued need for a mix of remote sensing and field surveys (aerial photography and ground counts), especially in the less-frequented parts of Antarctica, to gain reliable knowledge about the population demography and dynamics of this flagship species of the Antarctic ecosystem.
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137 |
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Public Library of Science |
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1932-6203 |
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yes |
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Call Number |
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Serial |
5287 |
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![find book details (via ISBN) isbn](img/isbn.gif)
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Title |
Emperors in Hiding: When Ice-Breakers and Satellites Complement Each Other in Antarctic Exploration |
Type |
Journal |
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Year |
2014 |
Publication |
PLOS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
6 |
Pages |
e100404 |
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Keywords |
Animal sexual behavior Animal sociality Antarctica Birds Census Glaciers Penguins Tongue |
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Abstract |
Evaluating the demographic trends of marine top predators is critical to understanding the processes involved in the ongoing rapid changes in Antarctic ecosystems. However, the remoteness and logistical complexity of operating in Antarctica, especially during winter, make such an assessment difficult. Satellite imaging is increasingly recognised as a valuable method for remote animal population monitoring, yet its accuracy and reliability are still to be fully evaluated. We report here the first ground visit of an emperor penguin colony first discovered by satellite, but also the discovery of a second one not indicated by satellite survey at that time. Several successive remote surveys in this coastal region of East Antarctica, both before and after sudden local changes, had indeed only identified one colony. These two colonies (with a total of ca. 7,400 breeding pairs) are located near the Mertz Glacier in an area that underwent tremendous habitat change after the glacier tongue broke off in February 2010. Our findings therefore suggest that a satellite survey, although offering a major advance since it allows a global imaging of emperor penguin colonies, may miss certain colony locations when challenged by certain features of polar ecosystems, such as snow cover, evolving ice topology, and rapidly changing habitat. Moreover our survey shows that this large seabird has considerable potential for rapid adaptation to sudden habitat loss, as the colony detected in 2009 may have moved and settled on new breeding grounds. Overall, the ability of emperor penguin colonies to relocate following habitat modification underlines the continued need for a mix of remote sensing and field surveys (aerial photography and ground counts), especially in the less-frequented parts of Antarctica, to gain reliable knowledge about the population demography and dynamics of this flagship species of the Antarctic ecosystem. |
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137 |
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ISSN |
1932-6203 |
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1932-6203 |
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yes |
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Call Number |
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Serial |
6689 |
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Title |
A New Method to Quantify within Dive Foraging Behaviour in Marine Predators
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Type |
Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
6 |
Pages |
e99329- |
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109 |
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Public Library of Science |
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ISSN |
1932-6203 |
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yes |
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Call Number |
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Serial |
5066 |
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Permanent link to this record |
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Title |
Tuberculosis Epidemiology and Selection in an Autochthonous Siberian Population from the 16th-19th Century
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Type |
Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
2 |
Pages |
e89877- |
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Programme |
1038 |
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Public Library of Science |
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1932-6203 |
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yes |
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4900 |
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Author |
Viviant Morgane, Monestiez Pascal, Guinet Christophe, |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Can We Predict Foraging Success in a Marine Predator from Dive Patterns Only? Validation with Prey Capture Attempt Data
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Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
3 |
Pages |
e88503- |
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Abstract |
Predicting how climatic variations will affect marine predator populations relies on our ability to assess foraging success, but evaluating foraging success in a marine predator at sea is particularly difficult. Dive metrics are commonly available for marine mammals, diving birds and some species of fish. Bottom duration or dive duration are usually used as proxies for foraging success. However, few studies have tried to validate these assumptions and identify the set of behavioral variables that best predict foraging success at a given time scale. The objective of this study was to assess if foraging success in Antarctic fur seals could be accurately predicted from dive parameters only, at different temporal scales. For this study, 11 individuals were equipped with either Hall sensors or accelerometers to record dive profiles and detect mouth-opening events, which were considered prey capture attempts. The number of prey capture attempts was best predicted by descent and ascent rates at the dive scale; bottom duration and descent rates at 30-min, 1-h, and 2-h scales; and ascent rates and maximum dive depths at the all-night scale. Model performances increased with temporal scales, but rank and sign of the factors varied according to the time scale considered, suggesting that behavioral adjustment in response to prey distribution could occur at certain scales only. The models predicted the foraging intensity of new individuals with good accuracy despite high inter-individual differences. Dive metrics that predict foraging success depend on the species and the scale considered, as verified by the literature and this study. The methodology used in our study is easy to implement, enables an assessment of model performance, and could be applied to any other marine predator.
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109 |
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Public Library of Science |
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1932-6203 |
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5118 |
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Author |
Patrick Samantha C, Weimerskirch Henri, |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Personality, Foraging and Fitness Consequences in a Long Lived Seabird
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Type |
Journal Article |
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Year |
2014 |
Publication |
PLoS ONE |
Abbreviated Journal |
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Volume |
9 |
Issue |
2 |
Pages |
e87269- |
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109 |
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Public Library of Science |
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ISSN |
1932-6203 |
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yes |
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Call Number |
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Serial |
5094 |
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Permanent link to this record |