| Records |
| Author |
Tiphaine Jeanniard-du-Dot, Andrew W. Trites, John P. Y. Arnould, Christophe Guinet |
| Title |
Reproductive success is energetically linked to foraging efficiency in Antarctic fur seals |
Type |
Journal |
| Year |
2017 |
Publication |
PLOS ONE |
Abbreviated Journal  |
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| Volume |
12 |
Issue |
4 |
Pages |
e0174001 |
| Keywords |
Accelerometers Antarctica Bioenergetics Foraging Predation Reproductive success Seals Trophic interactions |
| Abstract |
The efficiency with which individuals extract energy from their environment defines their survival and reproductive success, and thus their selective contribution to the population. Individuals that forage more efficiently (i.e., when energy gained exceeds energy expended) are likely to be more successful at raising viable offspring than individuals that forage less efficiently. Our goal was to test this prediction in large long-lived mammals under free-ranging conditions. To do so, we equipped 20 lactating Antarctic fur seals (Arctocephalus gazella) breeding on Kerguelen Island in the Southern Ocean with tags that recorded GPS locations, depth and tri-axial acceleration to determine at-sea behaviours and detailed time-activity budgets during their foraging trips. We also simultaneously measured energy spent at sea using the doubly-labeled water (DLW) method, and estimated the energy acquired while foraging from 1) type and energy content of prey species present in scat remains, and 2) numbers of prey capture attempts determined from head acceleration. Finally, we followed the growth of 36 pups from birth until weaning (of which 20 were the offspring of our 20 tracked mothers), and used the relative differences in body mass of pups at weaning as an index of first year survival and thus the reproductive success of their mothers. Our results show that females with greater foraging efficiencies produced relatively bigger pups at weaning. These mothers achieved greater foraging efficiency by extracting more energy per minute of diving rather than by reducing energy expenditure. This strategy also resulted in the females spending less time diving and less time overall at sea, which allowed them to deliver higher quality milk to their pups, or allowed their pups to suckle more frequently, or both. The linkage we demonstrate between reproductive success and the quality of individuals as foragers provides an individual-based quantitative framework to investigate how changes in the availability and accessibility of prey can affect fitness of animals. |
| Programme |
109 |
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| ISSN |
1932-6203 |
ISBN |
1932-6203 |
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Approved |
yes |
| Call Number |
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Serial |
6640 |
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| Author |
Jeanniard?du?Dot Tiphaine, Guinet Christophe, Arnould John P.Y., Speakman John R., Trites Andrew W., Goldbogen Jeremy |
| Title |
Accelerometers can measure total and activity?specific energy expenditures in free?ranging marine mammals only if linked to time?activity budgets |
Type |
Journal |
| Year |
2017 |
Publication |
Functional Ecology |
Abbreviated Journal |
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| Volume |
31 |
Issue |
2 |
Pages |
377-386 |
| Keywords |
acceleration Antarctic fur seal energy expenditure foraging metabolic rate northern fur seal time?activity budget VeDBA |
| Abstract |
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109 |
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| ISSN |
0269-8463 |
ISBN |
0269-8463 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6641 |
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| Author |
Jeanniard?du?Dot Tiphaine, Trites Andrew W., Arnould John P. Y., Speakman John R., Guinet Christophe |
| Title |
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Type |
Journal |
| Year |
2017 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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| Volume |
7 |
Issue |
9 |
Pages |
2969-2976 |
| Keywords |
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| Programme |
109 |
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Edition |
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| ISSN |
2045-7758 |
ISBN |
2045-7758 |
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Approved |
yes |
| Call Number |
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Serial |
6642 |
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| Title |
Under the sea ice: Exploring the relationship between sea ice and the foraging behaviour of southern elephant seals in East Antarctica |
Type |
Journal |
| Year |
2017 |
Publication |
Progress in Oceanography |
Abbreviated Journal |
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| Volume |
156 |
Issue |
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Pages |
17-40 |
| Keywords |
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| Abstract |
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| Programme |
109 |
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Edition |
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| ISSN |
0079-6611 |
ISBN |
0079-6611 |
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Approved |
yes |
| Call Number |
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Serial |
6643 |
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| Title |
Variability in sea ice cover and climate elicit sex specific responses in an Antarctic predator |
Type |
Journal |
| Year |
2017 |
Publication |
Scientific Reports |
Abbreviated Journal |
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| Volume |
7 |
Issue |
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Pages |
43236 |
| Keywords |
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| Abstract |
Contrasting regional changes in Southern Ocean sea ice have occurred over the last 30 years with distinct regional effects on ecosystem structure and function. Quantifying how Antarctic predators respond to such changes provides the context for predicting how climate variability/change will affect these assemblages into the future. Over an 11-year time-series, we examine how inter-annual variability in sea ice concentration and advance affect the foraging behaviour of a top Antarctic predator, the southern elephant seal. Females foraged longer in pack ice in years with greatest sea ice concentration and earliest sea ice advance, while males foraged longer in polynyas in years of lowest sea ice concentration. There was a positive relationship between near-surface meridional wind anomalies and female foraging effort, but not for males. This study reveals the complexities of foraging responses to climate forcing by a poleward migratory predator through varying sea ice property and dynamic anomalies. |
| Programme |
109 |
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Edition |
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| ISSN |
2045-2322 |
ISBN |
2045-2322 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6644 |
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| Author |
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| Title |
Breeding success of a marine central place forager in the context of climate change: A modeling approach |
Type |
Journal |
| Year |
2017 |
Publication |
PLOS ONE |
Abbreviated Journal |
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| Volume |
12 |
Issue |
3 |
Pages |
e0173797 |
| Keywords |
Climate change Animal sexual behavior Foraging Predation Seals Bioenergetics Death rates Islands |
| Abstract |
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| Programme |
109 |
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| Series Editor |
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Series Issue |
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Edition |
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| ISSN |
1932-6203 |
ISBN |
1932-6203 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6645 |
| Permanent link to this record |
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| Author |
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| Title |
Effect of extreme sea surface temperature events on the demography of an age-structured albatross population |
Type |
Journal |
| Year |
2017 |
Publication |
Phil. Trans. R. Soc. B |
Abbreviated Journal |
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| Volume |
372 |
Issue |
1723 |
Pages |
20160143 |
| Keywords |
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| Abstract |
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| Programme |
109 |
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| ISSN |
0962-8436, 1471-2970 |
ISBN |
0962-8436, 1471-2970 |
Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6646 |
| Permanent link to this record |
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| Author |
Patrick Samantha Clare, Weimerskirch Henri, Aubry Lise |
| Title |
Reproductive success is driven by local site fidelity despite stronger specialisation by individuals for large?scale habitat preference |
Type |
Journal |
| Year |
2017 |
Publication |
Journal of Animal Ecology |
Abbreviated Journal |
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| Volume |
86 |
Issue |
3 |
Pages |
674-682 |
| Keywords |
black?browed albatross foraging niche width generalist intra?individual variability seabirds |
| Abstract |
Summary There is widespread evidence that within populations, specialists and generalists can coexist and this is particularly prevalent in marine ecosystems, where foraging specialisations are evident. While individuals may limit niche overlap by consistently foraging in specific areas, site fidelity may also emerge as an artefact of habitat choice, but both drivers and fitness consequences of site fidelity are poorly understood. Here, we examine an individual metric of site and habitat fidelity, using tracking data collected over 11 years for black?browed albatrosses (Thalassarche melanophris). Fidelity was calculated as the similarity between pairs of foraging zones, quantifying measures for within and between years. Foraging areas were identified using area?restricted search, defined as periods during which birds decrease speed and increase turning. Our results demonstrate that birds were considerably more specialised in the habitat in which they forage than the exact location they use within years, and there was a similar pattern between years. However, despite this, it was site fidelity that explained reproductive success. Within a single year, females which were more faithful to a specific location had higher reproductive success than non?specialists, and between years there was a tendency for both sexes. Our results suggest that black?browed albatrosses are highly faithful in their foraging habitat but it is rather site fidelity that is more clearly associated with reproductive success. |
| Programme |
109 |
| Campaign |
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Edition |
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| ISSN |
0021-8790 |
ISBN |
0021-8790 |
Medium |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6647 |
| Permanent link to this record |
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| Author |
Marina Renedo, Paco Bustamante, Emmanuel Tessier, Zoyne Pedrero, Yves Cherel, David Amouroux |
| Title |
Assessment of mercury speciation in feathers using species-specific isotope dilution analysis |
Type |
Journal |
| Year |
2017 |
Publication |
Talanta |
Abbreviated Journal |
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| Volume |
174 |
Issue |
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Pages |
100-110 |
| Keywords |
GC-ICPMS Inorganic mercury Inter-species transformations Keratin Methylmercury Seabirds Southern Ocean |
| Abstract |
Seabirds are considered as effective sentinels of environmental marine contamination and their feathers are extensively used as non-lethal samples for contaminant biomonitoring. This tissue represents the main route for mercury (Hg) elimination in seabirds and contains predominantly methylmercury (MeHg). In this work, we developed a robust analytical technique for precise and accurate simultaneous quantification of MeHg, inorganic Hg (iHg) and consequently total Hg (THg), in feathers by gas-chromatography (GC)-ICPMS analyses using species-specific isotope dilution technique. An optimisation of the extraction method was carried out by testing different extraction systems, reagents and spiking procedures using an internal reference feather sample. The procedure was validated for MeHg and THg concentrations with a human hair certified reference material. Microwave nitric acid extraction with spike addition before the extraction provided the best recovery and was chosen as the most appropriate species simultaneous extraction method (SSE). An additional assessment was performed by comparison of our developed extraction method and a MeHg specific extraction technique (MSE) classically used for Hg speciation studies on feathers. The developed method was applied to feather samples from a large number of seabirds from the Southern Ocean (penguins, albatrosses, petrels and skuas) to investigate the variability of Hg speciation across a large range of Hg exposure conditions and concentrations. In all cases, MeHg accounted for > 90% of THg, thus verifying the predominance of organic Hg over iHg in feathers. |
| Programme |
109 |
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Edition |
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| ISSN |
0039-9140 |
ISBN |
0039-9140 |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6648 |
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| Author |
Colin Southwell, Louise Emmerson, Akinori Takahashi, Christophe Barbraud, Karine Delord, Henri Weimerskirch |
| Title |
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Type |
Journal |
| Year |
2017 |
Publication |
Global Ecology and Conservation |
Abbreviated Journal |
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| Volume |
9 |
Issue |
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Pages |
104-115 |
| Keywords |
Abundance Area protection Fisheries management Seabird |
| Abstract |
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| Programme |
109 |
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Edition |
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| ISSN |
2351-9894 |
ISBN |
2351-9894 |
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Expedition |
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| Notes |
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Approved |
yes |
| Call Number |
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Serial |
6649 |
| Permanent link to this record |
