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Author |
Delille D., Marty G., Cansemi Soullard M. & Frankignoulle M. |
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Title |
Influence of subantarctic Macrocystis bed metabolism in diel changes of marine bacterioplankton and CO2 fluxes. |
Type |
Journal Article |
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Year |
1997 |
Publication |
Journal of plankton research |
Abbreviated Journal |
J. Plankton Res. |
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Volume |
19 |
Issue  |
9 |
Pages |
1251-1264 |
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193 |
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0142-7873 |
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yes |
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1431 |
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Author |
Sarkissian A., Roscoe H.K., Fish D., Van Roozendael M., Gil M., Chen H.B., Wang P., Pommereau J.P. & Lenoble J. |
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Title |
Ozone and NO2 air-mass factors for zenith-sky spectrometers: Intercomparison of calculations with different radiative transfer models. |
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Journal Article |
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Year |
1995 |
Publication |
Geophysical research letters |
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Volume |
22 |
Issue |
9 |
Pages |
1113-1116 |
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209 |
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0094-8276 |
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yes |
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Serial |
1800 |
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Author |
Paquet, Fabien; Dauteuil, Olivier; Hallot, Erwan; Moreau, Frédérique |
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Title |
Tectonics and magma dynamics coupling in a dyke swarm of Iceland. |
Type |
Journal Article |
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Year |
2007 |
Publication |
Journal of structural geology |
Abbreviated Journal |
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Volume |
29 |
Issue |
9 |
Pages |
1477-1493 |
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316 |
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ISSN |
0191-8141 |
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yes |
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Serial |
4822 |
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Author |
Van Petegem, F.,; Collins, T.,; Meuwis, M.-A.,; Gerday, C.,; Feller, G.,; Van Beeumen, J., |
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Title |
Crystallization and preliminary X-ray analysis of a xylanase from the psychrophile Pseudoalteromonas haloplanktis |
Type |
Journal Article |
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Year |
2002 |
Publication |
Acta crystallographica section d-biological crystallography |
Abbreviated Journal |
Acta Crystallogr. D Biol. Crystallogr. |
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Volume |
58 |
Issue |
9 |
Pages |
1494-1496 |
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Keywords |
psychrophiles; cold-adapted enzyme; glycosyl hydrolases |
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Abstract |
The 46 kDa xylanase from the Antarctic microorganism Pseudoalteromonas haloplanktis is an enzyme that efficiently catalyzes reactions at low temperatures. Here, the crystallization of both the native protein and the SeMet-substituted enzyme and data collection from both crystals using synchrotron radiation are described. The native data showed that the crystals diffract to 1.3 A resolution and belong to space group P212121, with unit-cell parameters a = 50.87, b = 90.51, c = 97.23 A. SAD data collected at the peak of the selenium absorption edge proved to be sufficient to determine the heavy-atom configuration and to obtain electron density of good quality. |
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193 |
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Publisher |
International Union of Crystallography |
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ISSN |
0907-4449 |
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Notes |
doi:10.1107/S0907444902011666 |
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yes |
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Call Number |
IPEV @ Thierry.Lemaire @ |
Serial |
5579 |
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Author |
Jenouvrier Stéphanie, Barbraud Christophe, Weimerskirch Henri, Caswell Hal, |
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Title |
Limitation of population recovery: a stochastic approach to the case of the emperor penguin
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Journal Article |
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Year |
2009 |
Publication |
Oikos |
Abbreviated Journal |
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Volume |
118 |
Issue |
9 |
Pages |
1292 -1298 |
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Abstract |
Major population crashes due to natural or human-induced environmental changes may be followed by recoveries. There is a growing interest in the factors governing recovery, in hopes that they might guide population conservation and management, as well as population recovery following a re-introduction program. The emperor penguin Aptenodytes forsteri population in Terre Adélie, Antarctica, declined by 50% during a regime shift in the mid-1970s, when abrupt changes in climate and ocean environment regimes affected the entire Southern Ocean ecosystem. Since then the population has remained stable and has not recovered. To determine the factors limiting recovery, we examined the consequences of changes in survival and breeding success after the regime shift. Adult survival recovered to its pre-regime shift level, but the mean breeding success declined and the variance in breeding success increased after the regime shift. Using stochastic matrix population models, we found that if the distribution of breeding success observed prior to the regime shift had been retained, the emperor penguin population would have recovered, with a median time to recovery of 36 years. The observed distribution of breeding success after the regime shift makes recovery very unlikely. This indicates that the pattern of breeding success is sufficient to have prevented emperor penguin population recovery. The population trajectory predicted on the basis of breeding success agrees with the observed trajectory. This suggests that the net effect of any facors other than breeding success must be small. We found that the probability of recovery and the time to recovery depend on both the mean and variance of breeding success. Increased variance in breeding success increases the probability of recovery when mean success is low, but has the opposite effect when the mean is high. This study shows the important role of breeding success in determining population recovery for a long-lived species and demonstrates that demographic mechanisms causing population crash can be different from those preventing population recovery.
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Programme |
109 |
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Publisher |
Blackwell Publishing Ltd |
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ISSN |
1600-0706 |
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Approved |
yes |
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Call Number |
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Serial |
2202 |
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Author |
Coco I, Amata E, Marcucci M F, Ambrosino D, Villain J-P, Hanuise C, |
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Title |
The effects of an interplanetary shock on the high-latitude ionospheric convection during an IMF By-dominated period
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Type |
Journal Article |
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Year |
2008 |
Publication |
Ann. Geophys. |
Abbreviated Journal |
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Volume |
26 |
Issue |
9 |
Pages |
2937-2951 |
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Abstract |
On 6 January 1998 an interplanetary shock hit the magnetosphere around 14:15 UT and caused a reconfiguration of the northern high-latitude ionospheric convection. We use SuperDARN, spacecraft and ground magnetometer data to study such reconfiguration. We find that the shock front was tilted towards the morning flank of the magnetosphere, while the Interplanetary Magnetic Field (IMF) was By-dominated, with By<0, IMF Bz>0 and |By|>>Bz. As expected, the magnetospheric compression started at the first impact point of the shock on the magnetopause causing an increase of the Chapman-Ferraro current from dawn to dusk and yielding an increase of the geomagnetic field at the geostationary orbit and on the ground. Moreover, the high-latitude magnetometer data show vortical structures clearly related to the interaction of the shock with the magnetosphere-ionosphere system. In this context, the SuperDARN convection maps show that at very high latitudes above the northern Cusp and in the morning sector, intense sunward convection fluxes appear, well correlated in time with the SI arrival, having a signature typical for Bz>0 dominated lobe reconnection. We suggest that in this case the dynamic pressure increase associated to the shock plays a role in favouring the setting up of a new lobe merging line albeit |By|>>Bz≥0. |
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Programme |
312;911 |
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Corporate Author |
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Thesis |
Bachelor's thesis |
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Publisher |
Copernicus Publications |
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Edition |
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ISSN |
1432-0576 |
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Approved |
yes |
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Call Number |
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Serial |
2731 |
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Author |
Dobson F Stephen, Jouventin Pierre, |
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Title |
The trade-off of reproduction and survival in slow-breeding seabirds
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Type |
Journal Article |
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Year |
2010 |
Publication |
Can. J. Zool. |
Abbreviated Journal |
Can. J. Zool. |
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Volume |
88 |
Issue |
9 |
Pages |
889-899 |
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Keywords |
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Abstract |
Le compromis entre la reproduction et la survie est l’un des aspects empiriques les plus cohérents de la diversification des cycles biologiques. Une explication de ce patron interspécifique est l’évolution de différences dans l’équilibre entre les allocations à la reproduction par rapport au maintien individuel et à la survie. On s’attend, cependant, à ce que le même patron soit simplement dû à des différences de taille corporelle entre les espèces. Nous testons ces explications de rechange à l’aide de données originales sur 44 espèces d’albatros et de pétrels, des oiseaux marins à grande longévité et à reproduction très étalée. Une fois retirés les effets de la taille et de la phylogénie par des techniques de régression, il existe un important compromis entre la reproduction annuelle et la survie. Il y a aussi des compromis significatifs entre nos mesures de l’effort reproductif et l’âge à la maturité et ce dernier est fortement associé à la survie. Le taux d’alimentation des petits, le succès de l’envol des petits et la production annuelle de petits sont aussi associés de manière significative. En somme, une fois les effets de la taille retirés, il existe un compromis significatif entre la reproduction et la survie, malgré le fait que ces oiseaux longévifs pondent une seul œuf à la fois. Notre examen du patron entre les traits du cycle biologiques de ces oiseaux à reproduction étalée et notre étude de leur écologie alimentaire pélagique viennent renforcer l’explication évolutive de l’existence d’un compromis entre la reproduction et la survie. |
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354 |
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Publisher |
NRC Research Press |
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ISSN |
0008-4301 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
3038 |
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Author |
Leclaire Sarah, White Joël, Arnoux Emilie, Faivre Bruno, Vetter Nathanaël, Hatch Scott, Danchin Étienne, |
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Title |
Integument coloration signals reproductive success, heterozygosity, and antioxidant levels in chick-rearing black-legged kittiwakes
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Type |
Journal Article |
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Year |
2011 |
Publication |
Naturwissenschaften |
Abbreviated Journal |
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Volume |
98 |
Issue |
9 |
Pages |
773-782 |
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Keywords |
Biomedical and Life Sciences, |
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Abstract |
Carotenoid pigments are important for immunity and as antioxidants, and carotenoid-based colors are believed to provide honest signals of individual quality. Other colorless but more efficient antioxidants such as vitamins A and E may protect carotenoids from bleaching. Carotenoid-based colors have thus recently been suggested to reflect the concentration of such colorless antioxidants, but this has rarely been tested. Furthermore, although evidence is accruing for multiple genetic criteria for mate choice, carotenoid-based colors have rarely been shown to reflect both phenotypic and genetic quality. In this study, we investigated whether gape, tongue, eye-ring, and bill coloration of chick-rearing black-legged kittiwakes Rissa tridactyla reflected circulating levels of carotenoids and vitamins A and E. We further investigated whether integument coloration reflected phenotypic (body condition and fledging success) and genetic quality (heterozygosity). We found that the coloration of fleshy integuments was correlated with carotenoid and vitamin A levels and fledging success but only in males. Furthermore, the coloration of tongue and eye-ring was correlated with heterozygosity in both males and females. Integument colors might therefore be reliable signals of individual quality used by birds to adjust their parental care during the chick-rearing period. |
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Programme |
1162 |
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Thesis |
Bachelor's thesis |
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Publisher |
Springer Berlin / Heidelberg |
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Series Editor |
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Edition |
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ISSN |
0028-1042 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
3515 |
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Author |
Eléaume Marc, Hemery Lenaïg, Bowden David, Roux Michel, |
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Title |
A large new species of the genus Ptilocrinus (Echinodermata, Crinoidea, Hyocrinidae) from Antarctic seamounts
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Type |
Journal Article |
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Year |
2011 |
Publication |
Polar Biology |
Abbreviated Journal |
Polar Biol. |
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Volume |
34 |
Issue |
9 |
Pages |
1385-1397 |
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Keywords |
Biomedical and Life Sciences, |
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Abstract |
Ptilocrinus amezianeae n. sp. is a new species of stalked crinoid attributed to the family Hyocrinidae. Forty-five specimens were collected from seamounts north of the Ross Sea, and one specimen from the Kerguelen Plateau at depths ranging from 450 to 1,680 m. The collection from Admiralty and Scott seamounts constitutes the first example of a hyocrinid population known both from in situ photographs and from numerous collected specimens ranging from small juvenile to large adult. Variation in theca and stalk articulation characters throughout ontogeny is congruent with the molecular data and indicates that all the specimens examined belong to a single species. Tegmen and pinnule architecture, brachial arrangement, and stalk articular facets indicate that Ptilocrinus amezianeae n. sp. has close affinities with P. clarki and P. pinnatus from the northeastern Pacific and displays the most derived characters among these three species. Two cases of true arm division into two unequal branches suggest that Ptilocrinus and Calamocrinus are closely related. The picture and video transects on Admiralty seamount show a patchy distribution of living specimens with patches of mean density ca. 2.6 individuals m-2. In situ photographs also document predation by a sea urchin and a sea star on tegmen and proximal arms. The COI gene sequences analyzed in 25 specimens from Admiralty and Scott seamounts display low pairwise distances, low nucleotidic diversity, and intermediate haplotype diversity. These results, together with disarticulated ossicles and attachment disks observed on in situ photographs, indicate that the population investigated here is in decline. |
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Programme |
1124 |
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Publisher |
Springer Berlin / Heidelberg |
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Edition |
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ISSN |
0722-4060 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
3719 |
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Author |
Gómez-Díaz Elena, Boulinier Thierry, Sertour Natacha, Cornet Muriel, Ferquel Elisabeth, McCoy Karen D, |
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Title |
Genetic structure of marine Borrelia garinii and population admixture with the terrestrial cycle of Lyme borreliosis
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Type |
Journal Article |
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Year |
2011 |
Publication |
Environmental Microbiology |
Abbreviated Journal |
Environ. Microbiol. |
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Volume |
13 |
Issue |
9 |
Pages |
2453-2467 |
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Keywords |
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Abstract |
Despite the importance of population structure for the epidemiology of pathogenic bacteria, the spatial and ecological heterogeneity of these populations is often poorly characterized. Here, we investigated the genetic diversity and population structure of the Lyme borreliosis (LB) spirochaete Borrelia garinii in its marine cycle involving colonial seabirds and different host races of the seabird tick Ixodes uriae. Multilocus sequence analyses (MLSA) on eight chromosomal and two plasmid loci (ospA and ospC) indicate that B. garinii circulating in the marine system is highly diverse. Microevolution in marine B. garinii seems to be mainly clonal, but recombination and selection do occur. Sequence types were not evenly distributed among geographic regions, with substantial population subdivision between Atlantic and Pacific Ocean basins. However, no geographic structuring was evident within regions. Results of selection analyses and phylogenetic discordance between chromosomal and plasmid loci indicate adaptive evolution is likely occurring in this system, but no pattern of host or vector-associated divergence was found. Recombination analyses showed evidence for population admixture between terrestrial and marine strains, suggesting that LB spirochaetes are exchanged between these enzootic cycles. Importantly, our results highlight the need to explicitly consider the marine system for a complete understanding of the evolutionary ecology and global epidemiology of Lyme borreliosis.
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Programme |
333 |
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Publisher |
Blackwell Publishing Ltd |
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Edition |
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ISSN |
1462-2920 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
3778 |
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