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Isabelle Badenhausser, Lise Chambrin, Marc Lebouvier |
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2020 |
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151 p |
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136 |
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978-2-7380-1440-5 |
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7975 |
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Author |
Moe B., Hanssen S.A., Ytrehus B., Balk L., Chastel O., Christensen-Dalsgaard S., Gustavsson H., Langset M. |
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Title |
Thiamine deficiency and seabirds in Norway. A pilot study |
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Book |
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2020 |
Publication |
Norvegian institute for nature research report |
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1720 |
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Moe, B., Hanssen, S. A., Ytrehus, B., Balk, L., Chastel, O., Christensen-Dalsgaard, S., Gustavsson, H. & Langset, M. 2020.Thiamine deficiency and seabirds in Norway. A pilot study. NINA Report 1720. Norwegian Institute for Nature Research. Thiamine (vitamin B1) is vital for life-sustaining enzymes in cells. Previous studies have reported episodes of thiamine deficiency in marine ecosystems, and suggested that this have contributed to population declines of seabirds breeding in the Baltic Sea and elsewhere. Many Norwegian seabird populations have shown a strong decline in population size, but thiamine status has never been assessed. The objective of this pilot study was, thus, to document thiamin levels in selected species and their associated food webs, and explore methodological issues relevant for future studies or monitoring. The methodological tests showed that storage freezing temperature did not affect thiamine levels in egg yolk samples, and that thiamine levels in eggs could not be corrected for incubation time. Furthermore, the quantified thiamine levels differed between two laboratories, and we developed a predictive equation to convert thiamine levels in egg yolk samples between the laboratories. This pilot study has, for the first time, investigated thiamine levels in seabird eggs from selected species and populations in Norway mainland and Svalbard, and in their food webs. We revealed variation among species, populations and prey types. The lowest levels were found in eggs from common eiders and in blue mussel which is their prey. Eggs from herring gulls had also relatively low levels. The levels for common eiders and herring gulls were higher than previously reported from the Baltic Sea. Nevertheless, the levels from common eiders, herring gulls and blue mussels should be classified as thiamine deficient according to effect-ranges reported in these previous studies. The highest levels were found in eggs from kittiwakes and Atlantic puffins. The diet samples from kittiwakes and Atlantic puffins had higher thiamine levels compared to blue mussels. This is the first time thiamine levels are reported for kittiwakes and Atlantic puffins. This pilot-study cannot answer whether Norwegian seabird population sizes are affected by thiamine levels, but we cannot rule out that thiamine can be a limiting factor for some Norwegian seabird populations. This report identifies knowledge gaps and provides recommendations for future studies and monitoring. We suggest more sampling of levels to better understand variation among years, areas, species and populations, and also clinical examinations and surveys. Studies investigating potential effects on reproduction and survival is ultimately need to better understand potential effects on population dynamics. |
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330 |
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978-82-426-3471-9 |
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8727 |
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Boulinier, T., Betoulle, S., Caza, F., St Pierre, Y., Tornos, J., Gamble, A. &Amp; Tasiemski, A |
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Book Chapter |
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2020 |
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54-65 |
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333,1151 |
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Bachelor's thesis |
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1246-7375 |
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yes |
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6951 |
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Global variability in seawater Mg:Ca and Sr:Ca ratios in the modern ocean |
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2020 |
Publication |
Proceedings of the National Academy of Sciences |
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117 |
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36 |
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22281-22292 |
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136 |
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Bachelor's thesis |
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0027-8424, 1091-6490 |
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7781 |
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Searching for long period transiting exoplanets with ASTEP South at Dome C, Antarctica |
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2020 |
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SCAR 2020 Open Science Conference (abstract only) |
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Much of our understanding of gas giant exoplanets come from those transiting in front of bright stars at short orbital separations (P ~ 3 days, a ~ 0.05 au). However, these |
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1066 |
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Bachelor's thesis |
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yes |
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7807 |
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2020 |
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1066 |
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Bachelor's thesis |
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7828 |
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Author |
Vincent Lesur, Aude Chambodut |
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The French network of magnetic observatories |
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2020 |
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139 |
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7095 |
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Two-colour photometry to search for transiting exoplanets with ASTEP at Dome C, Antarctica |
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2020 |
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Scar 2020 open science conference |
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Dome C in Antarctica provides exceptional conditions for photometry thanks to the continuous night during the Antarctic winter, a high clear sky fraction, low wind speeds, and a cold and dry atmosphere. The ASTEP project (Antarctic Search for Transiting ExoPlanets) aims at detecting and characterising transiting exoplanets and qualifying this site for photometry in the visible. The main instrument, a 40 cm telescope, has been designed to perform high precision photometry under the extreme conditions of the Antarctic winter and has operated at the Concordia station since 2010. It will be upgraded with two new cameras and a new camera box in order to provide simultaneous two-colour photometry and substantially increase its throughput. The new setup will be operational for the winter campaign 2021 and will allow us to discover transiting exoplanets orbiting bright stars in particular low mass exoplanets, temperate exoplanets, exoplanets around young stars, and to refine the ephemerides of exoplanets discovered by the TESS mission. These observations will provide targets for first characterisation with the CHEOPS mission and atmospheric studies with the JWST and ARIEL missions. In this talk, I will describe the science goals and the upgrade of the ASTEP telescope. |
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7806 |
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Author |
Crouzet N., et al. |
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Towards a two-colour photometer at Dome C, Antartica |
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2020 |
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ESA SCI Science Workshop #13, 1-3 December 2020, Virtual Meeting |
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7830 |
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Supercooled Liquid Water Cloud observed, analysed and modelled at the Top of the Planetary Boundary Layer above Dome C |
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2020 |
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Antarctica, SCAR, Visio, Hobart, Australia, August 2020 |
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910 |
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7839 |
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