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Author |
Thierry Boulinier |
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Title |
Avian influenza spread and seabird movements between colonies |
Type |
Journal |
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Year |
2023 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
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Volume |
38 |
Issue |
5 |
Pages |
391-395 |
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Keywords |
colonial breeding foraging HPAI H5N1 migration movement ecology prospecting spatial disease dynamics |
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Abstract |
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Programme |
333,1151 |
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Thesis |
Bachelor's thesis |
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Series Volume  |
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Edition |
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ISSN |
0169-5347 |
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Approved |
yes |
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Call Number |
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Serial |
8502 |
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Author |
Joris Laborie, Matthieu Authier, Adrien Chaigne, Karine Delord, Henri Weimerskirch, Christophe Guinet |
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Title |
Estimation of total population size of southern elephant seals (Mirounga leonina) on Kerguelen and Crozet Archipelagos using very high-resolution satellite imagery |
Type |
Journal |
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Year |
2023 |
Publication |
Frontiers in Marine Science |
Abbreviated Journal |
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Volume |
10 |
Issue |
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Pages |
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Keywords |
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Abstract |
Southern elephant seals (Mirounga leonina) play a pivotal role in the Southern Ocean as wide-ranging marine predators and major prey consumers within Southern Ocean marine ecosystems. Due to their circumpolar distribution and the remoteness of their habitat, large uncertainties remain about their total population sizes. This is especially true for elephant seal populations in the French Southern Territories in the southern Indian Ocean (i.e. Crozet and Kerguelen Archipelagos) as many breeding sites are inaccessible for ground censuses. Here, we present a simple and efficient approach for estimating the total elephant seal populations of the Kerguelen and Crozet Archipelagos by using very high-resolution satellite imagery (<1m resolution). Twenty-eight satellite images taken during the breeding season to count female elephant seals in inaccessible areas were used and complemented the traditional annual ground counts in accessible areas. For Kerguelen Island sectors likely to host colonies and where no satellite images were available for the breeding season, a statistical predictive model was built to estimate the most likely number of breeding females to be present on a given beach according to its physiographic characteristics. Our results show the reliability of using very high-resolution satellite images, a relatively low-cost platform, to count pinniped populations and provide the first estimation of the total southern elephant seal population for both the Kerguelen 347,995 (s e = 4,950) and Crozet 13,065 (s e = 169) Archipelagos. The combined total represents over 35% of the global elephant seal population with the Kerguelen stock being numerically equivalent to the South Georgia stock. In addition, we re-examined the population trends since the last mid-century for Kerguelen and over the last five decades for Crozet. The demographic trends of the southern Indian Ocean populations show marked growth over the last decade (5.1% and 1.6% annual growth rate for Crozet and Kerguelen respectively), particularly on Crozet where the elephant seal population has more than tripled. |
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Programme |
109,1201 |
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Thesis |
Bachelor's thesis |
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Edition |
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ISSN |
2296-7745 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8535 |
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Title |
Track and dive-based movement metrics do not predict the number of prey encountered by a marine predator |
Type |
Journal |
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Year |
2023 |
Publication |
Movement Ecology |
Abbreviated Journal |
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Volume |
11 |
Issue |
1 |
Pages |
3 |
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Keywords |
Accelerometry Area-restricted search Diving behavior Foraging behavior Marine predator Prey encounter events |
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Abstract |
Studying animal movement in the context of the optimal foraging theory has led to the development of simple movement metrics for inferring feeding activity. Yet, the predictive capacity of these metrics in natural environments has been given little attention, raising serious questions of the validity of these metrics. The aim of this study is to test whether simple continuous movement metrics predict feeding intensity in a marine predator, the southern elephant seal (SES; Mirounga leonine), and investigate potential factors influencing the predictive capacity of these metrics. |
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Programme |
109,1201 |
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Thesis |
Bachelor's thesis |
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Series Issue |
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Edition |
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ISSN |
2051-3933 |
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Approved |
yes |
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Call Number |
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Serial |
8556 |
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| Permanent link to this record |
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Author |
Taiki Adachi, Philip Lovell, James Turnbull, Mike A. Fedak, Baptiste Picard, Christophe Guinet, Martin Biuw, Theresa R. Keates, Rachel R. Holser, Daniel P. Costa, Daniel E. Crocker, Patrick J. O. Miller |
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Title |
Body condition changes at sea: Onboard calculation and telemetry of body density in diving animals |
Type |
Journal |
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Year |
2023 |
Publication |
Methods in Ecology and Evolution |
Abbreviated Journal |
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Volume |
14 |
Issue |
6 |
Pages |
1457-1474 |
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Keywords |
animal health bio-logging body density buoyancy marine mammal real-time monitoring satellite transmission |
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Abstract |
The ability of marine mammals to accumulate sufficient lipid energy reserves is vital for mammals' survival and successful reproduction. However, long-term monitoring of at-sea changes in body condition, specifically lipid stores, has only been possible in elephant seals performing prolonged drift dives (low-density lipids alter the rates of depth change while drifting). This approach has limited applicability to other species. Using hydrodynamic performance analysis during transit glides, we developed and validated a novel satellite-linked data logger that calculates real-time changes in body density (?lipid stores). As gliding is ubiquitous amongst divers, the system can assess body condition in a broad array of diving animals. The tag processes high sampling rate depth and three-axis acceleration data to identify 5 s high pitch angle glide segments at depths >100 m. Body density is estimated for each glide using gliding speed and pitch to quantify drag versus buoyancy forces acting on the gliding animal. We used tag data from 24 elephant seals (Mirounga spp.) to validate the onboard calculation of body density relative to drift rate. The new tags relayed body density estimates over 200 days and documented lipid store accumulation during migration with good correspondence between changes in body density and drift rate. Our study provided updated drag coefficient values for gliding (Cd,f = 0.03) and drifting (Cd,s = 0.12) elephant seals, both substantially lower than previous estimates. We also demonstrated post-hoc estimation of the gliding drag coefficient and body density using transmitted data, which is especially useful when drag parameters cannot be estimated with sufficient accuracy before tag deployment. Our method has the potential to advance the field of marine biology by switching the research paradigm from indirectly inferring animal body condition from foraging effort to directly measuring changes in body condition relative to foraging effort, habitat, ecological factors and anthropogenic stressors in the changing oceans. Expanding the method to account for diving air volumes will expand the system's applicability to shallower-diving (<100 m) species, facilitating real-time monitoring of body condition in a broad range of breath-hold divers. |
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Programme |
109, 1201 |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Series Editor |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2041-210X |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8620 |
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| Permanent link to this record |
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Author |
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Title |
Plant consumer innovation in skuas |
Type |
Journal |
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Year |
2023 |
Publication |
Journal of Ornithology |
Abbreviated Journal |
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Volume |
164 |
Issue |
3 |
Pages |
717-719 |
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Keywords |
Animal innovation Consumer innovation Field observation Novel food Stercorarius antarcticus lonnbergi |
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Abstract |
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Programme |
109,354 |
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Thesis |
Bachelor's thesis |
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Edition |
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ISSN |
2193-7206 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8635 |
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| Permanent link to this record |
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Author |
Bernard A., Chambodut A., Zigone D., Thore J-Y., Bes De Berc M., Fotze M.,Wardinski,I. |
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Title |
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Type |
Book Chapter |
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Year |
2023 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
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Keywords |
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Abstract |
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Programme |
133,139 |
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Thesis |
Bachelor's thesis |
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Approved |
yes |
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Call Number |
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Serial |
8673 |
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Author |
Antonella Tassone, Olivier Magand, Attilio Naccarato, Maria Martino, Domenico Amico, Francesca Sprovieri, Hippolyte Leuridan, Yann Bertrand, Michel Ramonet, Nicola Pirrone, Aurelien Dommergue |
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Title |
Seven-year monitoring of mercury in wet precipitation and atmosphere at the Amsterdam Island GMOS station |
Type |
Journal |
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Year |
2023 |
Publication |
Heliyon |
Abbreviated Journal |
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Volume |
9 |
Issue |
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Pages |
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Keywords |
Atmospheric pollution Atmospheric transport Mercury measurements Source identification Southern Hemisphere Wet deposition flux |
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Abstract |
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Programme |
416,1028 |
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Thesis |
Bachelor's thesis |
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Approved |
yes |
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Call Number |
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Serial |
8679 |
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Author |
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Title |
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Type |
Journal |
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Year |
2023 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
17 |
Issue |
12 |
Pages |
5241-5254 |
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Keywords |
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Abstract |
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Programme |
1110,1205 |
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Thesis |
Bachelor's thesis |
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ISSN |
1994-0416 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8699 |
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| Permanent link to this record |
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Author |
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Title |
Microbiota composition and diversity of multiple body sites vary according to reproductive performance in a seabird |
Type |
Journal |
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Year |
2023 |
Publication |
Molecular Ecology |
Abbreviated Journal |
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Volume |
32 |
Issue |
9 |
Pages |
2115-2133 |
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Keywords |
bacteria black-legged kittiwake feathers fitness individual quality microbiota reproductive success |
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Abstract |
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Programme |
1162 |
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Series Issue |
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Edition |
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ISSN |
1365-294X |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8391 |
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| Permanent link to this record |
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Author |
Sophia Ferchiou, France Caza, Richard Villemur, Jacques Labonne, Yves St-Pierre |
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Title |
Skin and Blood Microbial Signatures of Sedentary and Migratory Trout (Salmo trutta) of the Kerguelen Islands |
Type |
Journal |
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Year |
2023 |
Publication |
Fishes |
Abbreviated Journal |
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Volume |
8 |
Issue |
4 |
Pages |
174 |
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Keywords |
Salmo trutta 16S rRNA blood microbiome fish Kerguelen Islands migration skin microbiome |
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Abstract |
Our understanding of how microbiome signatures are modulated in wild fish populations remains poorly developed and has, until now, mostly been inferred from studies in commercial and farmed fish populations. Here, for the first time, we have studied changes in the skin and blood microbiomes of the Salmo trutta population of the volcanic Kerguelen archipelago located at the northern limit of the Antarctic Ocean. The Kerguelen Islands present a natural framework of population expansion and reveal a likely situation representing further climate change in distribution areas. Our results showed that S. trutta of the Kerguelen Islands has a microbiome signature distinct from those of salmonids of the Northern Hemisphere. Our study also revealed that the skin and blood microbiomes differ between sedentary and migratory S. trutta. While 18 phyla were shared between both groups of trout, independent of the compartment, 6 phyla were unique to migratory trout. Further analyses showed that microbiome signatures undergo significant site-specific variations that correlate, in some cases, with the peculiarity of specific ecosystems. Our study also revealed the presence of potential pathogens at particular sites and the impact of abiotic factors on the microbiome, most notably due to the volcanic nature of the environment. This study contributes to a better understanding of the factors that modulate the microbiome signatures of migratory and sedentary fish populations. It will also help to better monitor the impacts of climate change on the colonization process in the sub-Antarctic region. |
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Programme |
1041 |
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Edition |
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ISSN |
2410-3888 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8404 |
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| Permanent link to this record |
