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Author |
Olivier Gimenez, Christophe Barbraud |
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Journal |
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Year |
2017 |
Publication |
Population Ecology |
Abbreviated Journal |
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Volume |
59 |
Issue |
3 |
Pages |
287-291 |
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Programme |
109 |
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ISSN |
1438-390X |
ISBN  |
1438-390X |
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yes |
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Call Number |
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Serial |
7160 |
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Author |
Nathan Pacoureau, Matthieu Authier, Karine Delord, Christophe Guinet, Christophe Barbraud |
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Title |
Early-life density-dependence effects on growth and survival in subantarctic fur seals |
Type |
Journal |
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Year |
2017 |
Publication |
Population Ecology |
Abbreviated Journal |
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Volume |
59 |
Issue |
2 |
Pages |
139-155 |
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Keywords |
Arctocephalus tropicalis Capture-mark-recapture Growth model Marine top predator Population dynamics State space model |
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Abstract |
Understanding the regulation of natural populations has been a long-standing research program in ecology. Current knowledge on marine mammals and seabirds is biased toward the adult component of populations and lacking are studies investigating the juvenile component. Our goal was to estimate demographic parameters on the pre-weaning stage of a subantarctic fur seal (Arctocephalus tropicalis) population on Amsterdam Island, suspected to be regulated by density-dependence. The influence of abundance on growth parameters (length and weight) and survival was assessed over a study period spanning 16 years. We evidenced a negative trend in population growth rate when density increased. Density-dependence models were favored for pup body size and mass growth. Abundance had a clear influence on body length at high population-density, pups grew slower and were smaller at weaning than pups born in years with low population density. Abundance partly explained pup body mass variation and a weak effect was detected on pre-weaning survival. The causal mechanisms may be increased competition for food resources between breeding females, leading to a reduction of maternal input to their pups. Our results suggested that pup favored survival over growth and the development of their diving abilities in order to withstand the extreme fasting periods that are characteristic of this fur seal population. This analysis provides significant insight of density-dependent processes on early-life demographic parameters of a long lived and top-predator species, and more specifically on the pre-weaning stage with important consequences for our understanding of individual long-term fitness and population dynamics. |
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Programme |
109 |
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ISSN |
1438-390X |
ISBN |
1438-390X |
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Expedition |
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Conference |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7174 |
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| Permanent link to this record |
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Author |
Nathan Pacoureau, Matthieu Authier, Karine Delord, Christophe Guinet, Christophe Barbraud |
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Title |
Early-life density-dependence effects on growth and survival in subantarctic fur seals |
Type |
Journal |
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Year |
2017 |
Publication |
Population Ecology |
Abbreviated Journal |
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Volume |
59 |
Issue |
2 |
Pages |
139-155 |
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Keywords |
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Abstract |
Understanding the regulation of natural populations has been a long-standing research program in ecology. Current knowledge on marine mammals and seabirds is biased toward the adult component of populations and lacking are studies investigating the juvenile component. Our goal was to estimate demographic parameters on the pre-weaning stage of a subantarctic fur seal (Arctocephalus tropicalis) population on Amsterdam Island, suspected to be regulated by density-dependence. The influence of abundance on growth parameters (length and weight) and survival was assessed over a study period spanning 16 years. We evidenced a negative trend in population growth rate when density increased. Density-dependence models were favored for pup body size and mass growth. Abundance had a clear influence on body length at high population-density, pups grew slower and were smaller at weaning than pups born in years with low population density. Abundance partly explained pup body mass variation and a weak effect was detected on pre-weaning survival. The causal mechanisms may be increased competition for food resources between breeding females, leading to a reduction of maternal input to their pups. Our results suggested that pup favored survival over growth and the development of their diving abilities in order to withstand the extreme fasting periods that are characteristic of this fur seal population. This analysis provides significant insight of density-dependent processes on early-life demographic parameters of a long lived and top-predator species, and more specifically on the pre-weaning stage with important consequences for our understanding of individual long-term fitness and population dynamics. |
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Programme |
109 |
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ISSN |
1438-3896, 1438-390X |
ISBN |
1438-3896, 1438-390X |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
6662 |
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Author |
Samara Danel, Nancy Rebout, Francesco Bonadonna, Dora Biro |
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Title |
Wild skuas can use acoustic cues to locate hidden food |
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Journal |
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Year |
2022 |
Publication |
Animal Cognition |
Abbreviated Journal |
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Pages |
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Keywords |
Acoustic cue Cups task Exclusion performance Inferential reasoning by exclusion Shaking |
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Abstract |
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Programme |
354 |
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Series Volume |
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Edition |
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ISSN |
1435-9456 |
ISBN |
1435-9456 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8297 |
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Author |
C. Barbraud, J. Vasseur, K. Delord |
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Title |
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Type |
Journal |
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Year |
2018 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
41 |
Issue |
2 |
Pages |
313-322 |
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Keywords |
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Abstract |
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Programme |
109 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Approved |
yes |
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Call Number |
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Serial |
7111 |
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Author |
Caio V. Z. Cipro, Y. Cherel, P. Bocher, F. Caurant, P. Miramand, P. Bustamante |
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Title |
Trace elements in invertebrates and fish from Kerguelen waters, southern Indian Ocean |
Type |
Journal |
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Year |
2018 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
41 |
Issue |
1 |
Pages |
175-191 |
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Keywords |
Food web Kerguelen Metals Myctophid Plankton Trace elements |
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Abstract |
Given the lack of background data on essential and non-essential trace elements in invertebrates and fish known to be the predominant prey of marine mammals and seabirds breeding at the Kerguelen Islands, this study intends to provide these results of great influence for predators in higher trophic levels. To this end, plankton organisms (9 species/4 phyla), mollusks (2 bivalves and 2 squid species) and fishes (8 benthic and 10 pelagic species) from Kerguelen waters were analysed for cadmium (Cd), copper (Cu), mercury (Hg) and zinc (Zn). Individual concentrations of non-essential elements (particularly Cd) showed larger variation in comparison with essential ones likely due to their homeostasis. Thus Cd ranged over 4 orders of magnitude; however, Hg ranged only 1, without significant correlation to trophic level. Instead, ecological parameters (benthic/mesopelagic habitat and feeding ecology) showed a more important influence on the results. Concerning seashore organisms, bivalves collected inside the Gulf of Morbihan had higher Cd concentrations compared to those from the Kerguelen shelf, suggesting a local source of Cd, such as runoff water from bird colonies. Comparison with the literature showed metal concentrations in invertebrates and fishes from Kerguelen Islands somewhat lower than those in the Antarctic area, with Hg prevailing in benthic species and Cd in pelagic ones. In contrast to Hg, Cd values of squids, jellyfish and the amphipod Themisto gaudichaudii were significantly higher than all other species. Finally, top predators foraging in this area that can be subject to potentially high Hg and Cd exposure through their diet at Kerguelen are reviewed. |
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Programme |
109 |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Approved |
yes |
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Call Number |
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Serial |
7115 |
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Author |
Karine Delord, Yves Cherel, Christophe Barbraud, Olivier Chastel, Henri Weimerskirch |
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Title |
High variability in migration and wintering strategies of brown skuas (Catharacta antarctica lonnbergi) in the Indian Ocean |
Type |
Journal |
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Year |
2018 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
41 |
Issue |
1 |
Pages |
59-70 |
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Keywords |
Activity Feather Geolocator Intraspecific strategies Phenology Stable isotopes |
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Abstract |
Movements of brown skuas (Catharacta antarctica lonnbergi) originating from two populations in the southern Indian Ocean were studied during the nonbreeding period using geolocation. A total of 33 individuals were equipped resulting in 34 annual tracks recovered from 50 deployments. Brown skuas varied extensively in their post-breeding movements, from true long range migrations to reach distant wintering zones, to short movements in the vicinity of breeding grounds. Overall, brown skuas migrated northward to overwinter in different areas in the southern hemisphere; individuals remained in the Indian Ocean, except two that overwintered in the Benguela Current (Atlantic Ocean). Wintering grounds were generally situated in productive dynamic upwelling waters or frontal systems. Brown skuas avoided the less productive area of the South Subtropical Gyre in the Central Indian Ocean. Individuals clearly differed in migratory strategies, targeting areas in a continuum from the sub-Antarctic to the tropics. Inter-individual differences were not sex-dependent. The migration dates varied between sexes with females leaving the breeding sites earlier and returning later compared to males. The duration of migration depended on wintering area and sex. Males had shorter migrations than females, regardless of the wintering area. Isotopic signatures clearly indicated that birds moulted in the wintering area and during migration. The low ? 15N values of feathers that grew in mixed subtropical-sub-Antarctic waters suggest that skuas fed on low trophic level prey in these areas. The origin and consequences of such strong inter-individual variation in migratory strategies requires further investigation. |
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Programme |
109 |
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Series Volume |
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Edition |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Approved |
yes |
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Call Number |
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Serial |
7117 |
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Title |
Flights of drones over sub-Antarctic seabirds show species- and status-specific behavioural and physiological responses |
Type |
Journal |
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Year |
2018 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
41 |
Issue |
2 |
Pages |
259-266 |
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Keywords |
Albatrosses Altitude Disturbance Penguins Petrels UAV |
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Abstract |
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Programme |
109 |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7127 |
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Author |
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Title |
Important marine sectors for the top predator community around Kerguelen Archipelago |
Type |
Journal |
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Year |
2017 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
40 |
Issue |
2 |
Pages |
365-378 |
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Keywords |
Distribution Habitat modelling Marine mammals Seabirds Tracking |
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Abstract |
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Programme |
109 |
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Edition |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Approved |
yes |
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Call Number |
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Serial |
7181 |
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Author |
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Title |
Status and trends of albatrosses in the French Southern Territories, Western Indian Ocean |
Type |
Journal |
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Year |
2018 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
41 |
Issue |
10 |
Pages |
1963-1972 |
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Keywords |
Amsterdam Crozet Fisheries Kerguelen Monitoring |
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Abstract |
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Programme |
109 |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
7194 |
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| Permanent link to this record |
