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Title |
Location of studies and evidence of effects of herbivory on Arctic vegetation: a systematic map |
Type |
Journal |
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Year |
2021 |
Publication  |
Environmental Evidence |
Abbreviated Journal |
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Volume |
10 |
Issue |
1 |
Pages |
25 |
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Programme |
1036 |
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ISSN |
2047-2382 |
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yes |
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Serial |
8386 |
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Author |
Alain Manceau, Anne-Claire Gaillot, Pieter Glatzel, Yves Cherel, Paco Bustamante |
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Title |
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Type |
Journal |
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Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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Volume |
55 |
Issue |
3 |
Pages |
1515-1526 |
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Abstract |
In vivo and in vitro evidence for detoxification of methylmercury (MeHg) as insoluble mercury selenide (HgSe) underlies the central paradigm that mercury exposure is not or little hazardous when tissue Se is in molar excess (Se:Hg > 1). However, this hypothesis overlooks the binding of Hg to selenoproteins, which lowers the amount of bioavailable Se that acts as a detoxification reservoir for MeHg, thereby underestimating the toxicity of mercury. This question was addressed by determining the chemical forms of Hg in various tissues of giant petrels Macronectes spp. using a combination of high energy-resolution X-ray absorption near edge structure and extended X-ray absorption fine structure spectroscopy, and transmission electron microscopy coupled to elemental mapping. Three main Hg species were identified, a MeHg-cysteinate complex, a four-coordinate selenocysteinate complex (Hg(Sec)4), and a HgSe precipitate, together with a minor dicysteinate complex Hg(Cys)2. The amount of HgSe decreases in the order liver > kidneys > brain = muscle, and the amount of Hg(Sec)4 in the order muscle > kidneys > brain > liver. On the basis of biochemical considerations and structural modeling, we hypothesize that Hg(Sec)4 is bound to the carboxy-terminus domain of selenoprotein P (SelP) which contains 12 Sec residues. Structural flexibility allows SelP to form multinuclear Hgx(Se,Sec)y complexes, which can be biomineralized to HgSe by protein self-assembly. Because Hg(Sec)4 has a Se:Hg molar ratio of 4:1, this species severely depletes the stock of bioavailable Se for selenoprotein synthesis and activity to one ?g Se/g dry wet in the muscle of several birds. This concentration is still relatively high because selenium is naturally abundant in seawater, therefore it probably does not fall below the metabolic need for essential selenium. However, this study shows that this may not be the case for terrestrial animals, and that muscle may be the first tissue potentially injured by Hg toxicity. |
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109 |
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0013-936X |
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yes |
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Serial |
7942 |
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Title |
Contrasting Spatial and Seasonal Trends of Methylmercury Exposure Pathways of Arctic Seabirds: Combination of Large-Scale Tracking and Stable Isotopic Approaches |
Type |
Journal |
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Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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Volume |
54 |
Issue |
21 |
Pages |
13619-13629 |
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388 |
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ISSN |
0013-936X |
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Approved |
yes |
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Call Number |
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Serial |
8023 |
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Title |
A Bad Start in Life? Maternal Transfer of Legacy and Emerging Poly- and Perfluoroalkyl Substances to Eggs in an Arctic Seabird |
Type |
Journal |
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Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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Volume |
56 |
Issue |
10 |
Pages |
6091-6102 |
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Abstract |
In birds, maternal transfer is a major exposure route for several contaminants, including poly- and perfluoroalkyl substances (PFAS). Little is known, however, about the extent of the transfer of the different PFAS compounds to the eggs, especially for alternative fluorinated compounds. In the present study, we measured legacy and emerging PFAS, including Gen-X, ADONA, and F-53B, in the plasma of prelaying black-legged kittiwake females breeding in Svalbard and the yolk of their eggs. We aimed to (1) describe the contaminant levels and patterns in both females and eggs, and (2) investigate the maternal transfer, that is, biological variables and the relationship between the females and their eggs for each compound. Contamination of both females and eggs were dominated by linPFOS then PFUnA or PFTriA. We notably found 7:3 fluorotelomer carboxylic acid?a precursor of long-chain carboxylates?in 84% of the egg yolks, and provide the first documented finding of ADONA in wildlife. Emerging compounds were all below the detection limit in female plasma. There was a linear association between females and eggs for most of the PFAS. Analyses of maternal transfer ratios in females and eggs suggest that the transfer is increasing with PFAS carbon chain length, therefore the longest chain perfluoroalkyl carboxylic acids (PFCAs) were preferentially transferred to the eggs. The mean ?PFAS in the second-laid eggs was 73% of that in the first-laid eggs. Additional effort on assessing the outcome of maternal transfers on avian development physiology is essential, especially for PFCAs and emerging fluorinated compounds which are under-represented in experimental studies. |
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330 |
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ISSN |
0013-936X |
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yes |
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Call Number |
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Serial |
8315 |
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Author |
Alain Manceau, Romain Brossier, Sarah E. Janssen, Tylor J. Rosera, David P. Krabbenhoft, Yves Cherel, Paco Bustamante, Brett A. Poulin |
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Title |
Mercury Isotope Fractionation by Internal Demethylation and Biomineralization Reactions in Seabirds: Implications for Environmental Mercury Science |
Type |
Journal |
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Year |
2021 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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Volume |
55 |
Issue |
20 |
Pages |
13942-13952 |
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Abstract |
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Programme |
109 |
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0013-936X |
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yes |
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Call Number |
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Serial |
8427 |
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Author |
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Title |
Per- and Polyfluoroalkyl Substances Are Positively Associated with Thyroid Hormones in an Arctic Seabird |
Type |
Journal |
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Year |
2021 |
Publication |
Environmental Toxicology and Chemistry |
Abbreviated Journal |
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Volume |
40 |
Issue |
3 |
Pages |
820-831 |
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Keywords |
Avian toxicity Ecotoxicology Endocrine-disrupting compounds Per- and polyfluoroalkyl substance Thyroid hormones |
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Abstract |
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Programme |
330 |
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ISSN |
1552-8618 |
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Approved |
yes |
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Call Number |
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Serial |
7967 |
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Author |
Buscetti, M. |
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Title |
Influence of geomagnetic storms on seismometers |
Type |
Master 2 |
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Year |
2021 |
Publication |
Eost, Strasbourg |
Abbreviated Journal |
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139 |
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Approved |
yes |
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Call Number |
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Serial |
8099 |
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Author |
Alexandra Lavrillier, Semen Gabyshev, Liudmila Egorova, Galina Makarova, Maia Lomovtseva-Adukanova |
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Title |
Analysing Non-Existent and Existing Tourisms in Eastern Siberia among the Evenki, Even, Koryak and Itelmen |
Type |
Journal |
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Year |
2021 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
2020/3-2021/1 |
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Abstract |
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Programme |
1127 |
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ISSN |
0755-7809 |
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yes |
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Call Number |
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Serial |
6582 |
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Author |
Armelle Decaulne, Najat Bhiry, Janie Faucher-Roy, Clara Pelletier Boily |
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Title |
The development of Kangiqsualujjuaq and the threat of snow avalanches in a permafrost degradation context, Nunavik, Canada |
Type |
Journal |
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Year |
2021 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
2020/3-2021/1 |
Pages |
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Keywords |
active layer Canada demographic growth Nordic village slopes snow avalanches |
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Abstract |
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Programme |
1148 |
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ISSN |
0755-7809 |
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yes |
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Call Number |
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Serial |
8423 |
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Author |
Anika Immer, Thomas Merkling, Olivier Chastel, Scott A. Hatch, Etienne Danchin, Pierrick Blanchard, Sarah Leclaire |
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Title |
Spying on your neighbours? Social information affects timing of breeding and stress hormone levels in a colonial seabird |
Type |
Journal |
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Year |
2021 |
Publication |
Evolutionary Ecology |
Abbreviated Journal |
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Volume |
35 |
Issue |
3 |
Pages |
463-481 |
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Abstract |
A good overlap between offspring energetic requirements and availability of resources is required for successful reproduction. Accordingly, individuals from numerous species fine-tune their timing of breeding by integrating cues that predict environmental conditions during the offspring period. Besides acquiring information from their direct interaction with the environment (personal information), individuals can integrate information by observing the behaviours or performance of others (social information). The use of social information is often beneficial because the accumulated knowledge of conspecifics may represent a source of information more reliable than the intrinsically more limited personal information. However, although social information constitutes the major source of information in a wide range of contexts, studies investigating its use in the context of timing of breeding are scarce. We investigated whether black-legged kittiwakes (Rissa tridactyla) used social information to adjust the timing of egg-laying. We manipulated social information using a food-supplementation experiment, known to advance kittiwakes' reproductive phenology. We expected food-supplemented and unsupplemented pairs to delay and advance, respectively, their timing of laying when surrounded by a majority of neighbours from the opposite food-treatment. However, both unsupplemented and food-supplemented kittiwakes delayed egg-laying when surrounded by a higher proportion of neighbours from the opposite food-treatment. This result shows that kittiwakes use social information to time egg-laying, but that it is not used to match the seasonal peak of food availability. We suggest that when social and personal cues give contradictory environmental information, individuals may benefit from delaying laying to gather more information to make better decisions about investment into eggs. Further, we explored a potential proximate mechanism for the pattern we report. We show that baseline corticosterone, known to mediate reproductive decisions, was lower in unsupplemented females facing a higher proportion of food-supplemented neighbours. Altogether, our results suggest that to fine-tune their timing of laying, kittiwakes use complex decision-making processes in which social and personal information interplay. |
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1162 |
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ISSN |
1573-8477 |
ISBN |
1573-8477 |
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yes |
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Call Number |
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Serial |
8245 |
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| Permanent link to this record |
