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Author  |
Yves Cherel, Charline Parenteau, Paco Bustamante, Charles-André Bost |
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Title |
Stable isotopes document the winter foraging ecology of king penguins and highlight connectivity between subantarctic and Antarctic ecosystems |
Type |
Journal |
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Year |
2018 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
8 |
Issue |
5 |
Pages |
2752-2765 |
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Keywords |
diet myctophid prolactin seabird Southern Ocean |
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Abstract |
The poorly known winter foraging ecology of the king penguin, a major Southern Ocean consumer, was investigated at the subantarctic Crozet Islands where the largest global population breeds. Blood δ13C and δ15N values were used as proxies of the birds’ foraging habitat and diet, respectively, and circulating prolactin levels helped in determining the birds’ reproductive status. Plasma prolactin concentrations showed that king penguin adults of unknown breeding status (n = 52) that were present at the colony in winter were in fact breeders and failed breeders, but were not non -breeders. Circulating prolactin was neither related to δ13C nor δ15N values, thus suggesting that both breeders and failed breeders used the same foraging habitats and fed on the same prey. Plasma and blood cell isotopic values depicted four new relevant biological features on the feeding strategies of king penguins during the critical winter period: (1) 42% of the birds foraged in the distant Antarctic Zone, but 58% fed primarily in subantarctic waters (δ13C), (2) they preyed upon myctophids in both zones (δ15N), (3) individuals were consistent in their foraging strategies over the winter months (δ13C and δ15N), and (4) a higher proportion of females (77%–80%) than males (27%–31%) favored feeding in distant Antarctic waters (δ13C). This study highlights trophic connectivity between subantarctic and Antarctic ecosystems and hence the key role of energy export from Antarctic waters to sustain breeding populations of subantarctic predators, including during the Austral winter. |
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109,394 |
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Bachelor's thesis |
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ISSN |
2045-7758 |
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2045-7758 |
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yes |
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7114 |
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Author |
Yves Cherel, Antoine Carrouée |
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Title |
Assessing marine ecosystem complexity: isotopic integration of the trophic structure of seabird communities from the Southern Ocean |
Type |
Journal |
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Year |
2022 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
694 |
Issue |
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Pages |
193-208 |
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Keywords |
Antarctica Body size Habitat Penguins Procellariiformes Stable isotopes Trophic position |
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Abstract |
Understanding the processes structuring communities is a fundamental goal in ecology and conservation biology. Seabirds are commonly used as sentinels of marine ecosystems, but there is a lack of quantitative information providing a synoptic view of their community structure and of its underlying mechanisms. We used stable isotope analysis of chick feathers to investigate the structure of 2 communities that are representative of the subantarctic (Kerguelen) and Antarctic (Adélie Land) seabird diversity. Total area of the convex hull (a measure of the total δ13C-δ15N niche space) was 8.4-fold higher at the Kerguelen Islands than in Adélie Land, a consequence of the higher seabird diversity at the former locality. Kerguelen seabirds grouped into 2 clusters of oceanic and inshore species, with the latter group not represented in Adélie Land. Communities are primarily structured by the availability of foraging habitats (δ13C) and then of trophic resources (δ15N), with body size being a major driving force of trophic position. Ecological characteristics are more important than phylogeny to shape seabird isotopic niche breadth (standard ellipse area corrected for small sample size, SEAc), with no significant differences between Sphenisciformes, Procellariiformes, and Charadriiformes. By contrast, SEAc varies according to foraging guilds, diet, and a specialist-generalist gradient, with ubiquitous seabirds having a 10-fold larger mean SEAc than pelagic divers. This study sets a baseline against which the effects of long-term environmental changes on seabird community structure can be studied across years and conditions, and provides a relevant starting point for the investigation into the effect of climate change on Southern Ocean ecosystems. |
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109 |
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0171-8630, 1616-1599 |
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yes |
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8321 |
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Author |
Yves Cherel |
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Title |
A review of Southern Ocean squids using nets and beaks |
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Journal |
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Year |
2020 |
Publication |
Marine Biodiversity |
Abbreviated Journal |
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Volume |
50 |
Issue |
6 |
Pages |
98 |
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Abstract |
This review presents an innovative approach to investigate the teuthofauna from the Southern Ocean by combining two complementary data sets, the literature on cephalopod taxonomy and biogeography, together with predator dietary investigations. Sixty squids were recorded south of the Subtropical Front, including one circumpolar Antarctic (Psychroteuthis glacialis Thiele, 1920), 13 circumpolar Southern Ocean, 20 circumpolar subantarctic, eight regional subantarctic, and 12 occasional subantarctic species. A critical evaluation removed five species from the list, and one species has an unknown taxonomic status. The 42 Southern Ocean squids belong to three large taxonomic units, bathyteuthoids (n = 1 species), myopsids (n = 1), and oegopsids (n = 40). A high level of endemism (21 species, 50%, all oegopsids) characterizes the Southern Ocean teuthofauna. Seventeen families of oegopsids are represented, with three dominating families, onychoteuthids (seven species, five endemics), ommastrephids (six species, three endemics), and cranchiids (five species, three endemics). Recent improvements in beak identification and taxonomy allowed making new correspondence between beak and species names, such as Galiteuthis suhmi (Hoyle 1886), Liguriella podophtalma Issel, 1908, and the recently described Taonius notalia Evans, in prep. Gonatus phoebetriae beaks were synonymized with those of Gonatopsis octopedatus Sasaki, 1920, thus increasing significantly the number of records and detailing the circumpolar distribution of this rarely caught Southern Ocean squid. The review extends considerably the number of species, including endemics, recorded from the Southern Ocean, but it also highlights that the corresponding species to two well-described beaks (Moroteuthopsis sp. B and Psychroteuthis sp. B) are still unknown. |
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109 |
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ISSN |
1867-1624 |
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yes |
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Serial |
8072 |
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Author |
Yves Cherel |
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Title |
?Mastigoteuthis B Clarke, 1980, is a junior synonym of Asperoteuthis acanthoderma (Lu, 1977) (Cephalopoda, Oegopsida, Chiroteuthidae), a rare cosmopolitan deep-sea squid |
Type |
Journal |
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Year |
2021 |
Publication |
Marine Biodiversity |
Abbreviated Journal |
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Volume |
51 |
Issue |
1 |
Pages |
14 |
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Abstract |
The present work resolved the long-standing taxonomic problem associated with the enigmatic ?Mastigoteuthis B Clarke, 1980, by demonstrating that these lower beaks correspond to those of the large deep-sea chiroteuthid Asperoteuthis acanthoderma (Lu, 1977). A review of the existing literature listed 22 specimens of A. acanthoderma, but synonymizing ?Mastigoteuthis B with A. acanthoderma increased 14 times the species record worldwide. Pooling the data from both specimens and beaks (a total of 329 individuals) indicates that the species has a circumglobal distribution, since it occurs in tropical and subtropical waters of the Atlantic, Indian and Pacific Oceans. The synonymization also highlights trophic relationships of the species as a prey of top marine predators. Lower beaks of A. acanthoderma were mostly found in stomachs of sperm whales, but a few beaks were also recorded from stomach contents of sharks, swordfish and the wandering albatross. |
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109 |
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1867-1624 |
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yes |
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8208 |
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Author |
Yver, C., M. Schmidt, M. Ramonet, and M. Grand |
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Title |
Tropospheric hydrogen measurement in the RAMCES network, in 15th WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases, and Related Tracer Measurement Techniques, Jena, 2009. |
Type |
Conference - International - Communication |
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Year |
2009 |
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416 |
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yes |
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1308 |
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Author |
Yver Kwok C, Laurent O, Guemri A, Philippon C, Wastine B, Rella C W, Vuillemin C, Truong F, Delmotte M, Kazan V, Darding M, Lebègue B, Kaiser C, Ramonet M, |
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Title |
Comprehensive laboratory and field testing of cavity ring-down spectroscopy analyzers measuring H2O, CO2, CH4 and CO
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Type |
Journal Article |
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Year |
2015 |
Publication |
Atmospheric Measurement Techniques Discussions |
Abbreviated Journal |
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Volume |
8 |
Issue |
4 |
Pages |
4219-4272 |
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Abstract |
To develop an accurate measurement network of greenhouse gases, instruments in the field need to be stable and precise and thus require infrequent calibrations and a low consumption of consumables. For about ten years, cavity ring-down spectroscopy (CRDS) analyzers have been available that meet these stringent requirements for precision and stability. Here, we present the results of tests of CRDS instruments in the laboratory (47 instruments) and in the field (15 instruments). The precision and stability of the measurements are studied. We demonstrate that, thanks to rigorous testing, newer models generally perform better than older models, especially in terms of reproducibility between instruments. In the field, we see the importance of individual diagnostics during the installation phase, and we show the value of calibration and target gases that assess the quality of the data. Finally, we formulate recommendations for use of these analyzers in the field. |
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416 |
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Copernicus GmbH |
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ISSN |
1867-1381 |
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yes |
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Serial |
6042 |
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Author |
Yver C, Pison I, Fortems-Cheiney A, Schmidt M, Bousquet P, Ramonet M, Jordan A, Søvde A, Engel A, Fisher R, Lowry D, Nisbet E, Levin I, Hammer S, Necki J, Bartyzel J, Reimann S, Vollmer M K, Steinbacher M, Aalto T, Maione M, Arduini I, O'Doherty S, Grant A, Sturges W, Lunder C R, Privalov V, Paramonova N, |
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Title |
A new estimation of the recent tropospheric molecular hydrogen budget using atmospheric observations and variational inversion
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Type |
Journal Article |
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Year |
2010 |
Publication |
Atmos. Chem. Phys. Discuss. |
Abbreviated Journal |
1680-7316 |
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Volume |
10 |
Issue |
11 |
Pages |
28963-29005 |
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Abstract |
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Programme |
416 |
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Copernicus Publications |
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ISSN |
1680-7375 |
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yes |
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Serial |
3800 |
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Author |
Yushiro Fujii, Kenji Satake, Shingo Watada, Tung-Cheng Ho |
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Title |
Re-examination of Slip Distribution of the 2004 Sumatra–Andaman Earthquake (Mw 9.2) by the Inversion of Tsunami Data Using Green’s Functions Corrected for Compressible Seawater Over the Elastic Earth |
Type |
Journal |
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Year |
2021 |
Publication |
Pure and Applied Geophysics |
Abbreviated Journal |
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Volume |
178 |
Issue |
12 |
Pages |
4777-4796 |
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Keywords |
2004 Sumatra–Andaman earthquake far-field tsunami waveform phase-corrected Green’s function slip distribution tsunami data inversion |
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Abstract |
We re-examined the slip distribution on faults of the 2004 Sumatra–Andaman (M 9.1 according to USGS) earthquake by the inversion of tsunami data with phase-corrected Green’s functions applied to linear long waves. The correction accounts for the effects of compressibility of seawater, elasticity of solid earth, and gravitational potential variation associated with the motion of mass to reproduce the delayed arrivals and the reversed phase of the first tsunami waves. We used sea surface height (SSH) data from satellite altimetry (SA) measurements along five tracks, and the tsunami waveforms recorded at tide gauges (TGs) and ocean bottom pressure gauges (OBPGs) in and around the Indian Ocean. The inversion results for both data sets for different rupture velocities (Vr) show that the reproducibility of the spatiotemporal SSHs and tsunami waveforms is improved by the phase corrections, although the effects are not so significant within the Indian Ocean. The best slip distribution model from joint inversion of SA, TG and OBPG data with Vr of 1.3 km/s shows the largest slips of 16–25 m off Sumatra Island, large slips of 2–11 m off the Nicobar Islands, and moderate slips of 2–6 m in the Andaman Islands. The inversion results reproduce the far-field tsunami waveforms well at distant stations even more than 13,000–25,000 km from the epicenter. The total source length is about 1400 km and the seismic moment is Mw 9.2, longer and larger than that of our previous estimates based on TG records. |
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688 |
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ISSN |
1420-9136 |
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yes |
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Call Number |
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Serial |
8411 |
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Author |
Yuri I. Kantor, Myroslaw G. Harasewych, Nicolas Puillandre |
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Title |
A critical review of Antarctic Conoidea (Neogastropoda) |
Type |
Journal |
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Year |
2016 |
Publication |
Molluscan Research |
Abbreviated Journal |
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Volume |
36 |
Issue |
3 |
Pages |
153-206 |
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Keywords |
Antarctic Convergence bathymetric distribution endemism new name new species |
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Abstract |
The Antarctic Conoidean fauna is critically reviewed based on published data and specimens in the collections of the USNM, IORAS and MNHN. Forty-two species and subspecies of the superfamily Conoidea are recorded as occurring within the Antarctic Convergence (excluding the fauna of the Kerguelen Islands) and are attributed to 14 genera and seven families. These include the new taxa: Antarctospira n. gen. (type species—Leucosyrinx badenpowelli Dell, 1990); Drilliola antarctica n. sp.; Pleurotomella (Pleutoromella) tippetti n. sp.; Pleurotomella (Anomalotomella) petiti n. sp.; Xanthodaphne pastorinoi n. sp. Aforia watsoni is introduced as a new name for Pleurotoma (Surcula) lepta Watson, 1881, non Pleurotoma lepta Edwards, 1861. A lectotype is designated for Conorbella antarctica (Strebel, 1908). New combinations are also proposed. Antarctospira badenpowelli (Dell, 1990), n. comb. (previously assigned to Leucosyrinx); Antarctospira principalis (Thiele, 1912), n. comb. (previously assigned to Typhlomangelia); Antarctospira mawsoni (Powell, 1958), n. comb. (previously assigned to Leucosyrinx); Typhlodaphne paratenoceras (Powell, 1951), n. comb. (previously assigned to Leucosyrinx); Belalora weirichi (Engl, 2008), n. comb. (previously assigned to Oenopota); Pleurotomella (Anomalotomella) innocentia (Dell, 1990), n. comb. (previously assigned to Typhlodaphne); Pleurotomella (Anomalotomella) nipri (Numanami, 1996), n. comb. (previously assigned to Typhlodaphne); Xanthodaphne raineri (Engl, 2008), n. comb. (previously assigned to Pleurotomella); Aforia hedleyi (Dell, 1990), n. comb. (previously assigned to Pontiothauma). The majority of Antarctic conoidean taxa have hypodermic marginal teeth. Although there is a similar relative abundance of conoideans in Antarctic waters to that seen in other well-studied faunas, the low number of conoideans is indicative of the general impoverishment of the gastropod fauna in the region. Fourteen percent (2 of 14) of conoidean genera that occur within the Antarctic Convergence are endemic to Antarctic waters, as are 82% (34 of 42) of the species. Most taxa have very broad bathymetric ranges, some extending from bathyal to hadal depths. The greatest species diversity was at bathyal depths. |
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Programme |
281,1124,1142 |
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Bachelor's thesis |
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ISSN |
1323-5818 |
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yes |
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8285 |
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Author |
Young-Hyang Park and Frédéric Vivier |
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Title |
Circulation and hydrography over the Kerguelen Plateau |
Type |
Conference - International - Article with Reading Comitee |
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Year |
2011 |
Publication |
CYBIUM |
Abbreviated Journal |
Cybium |
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Volume |
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Issue |
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Pages |
43-55 |
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Abstract |
The Kerguelen Plateau is the largest near-meridional submarine plateau lying across the Antarctic Circumpolar Current (ACC), affecting significantly the large-scale circulation and pathways of the different water masses across the plateau. This has important implication not only for the local primary productivity and marine ecosystem but also for the meridional overturning circulation of the Southern Ocean. We give here a short review of the circulation and hydrography as well as the ACC transport over and around the Kerguelen Plateau. |
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1061 |
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0399-0974 |
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yes |
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1147 |
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