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Author |
Bost Charles-André, Cotté Cédric, Terray Pascal, Barbraud Christophe, Bon Cécile, Delord Karine, Gimenez Olivier, Handrich Yves, Naito Yasuhiko, Guinet Christophe, Weimerskirch Henri |
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Title |
Large-scale climatic anomalies affect marine predator foraging behaviour and demography |
Type |
Journal Article |
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Year |
2015 |
Publication |
Nature communications |
Abbreviated Journal |
2041-1723 |
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Volume |
6 |
Issue |
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Pages |
8220 |
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Keywords |
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Abstract  |
Understanding how organisms respond to short-term climate variations will help predict the impact of future global change. Here, Bost et al. show that large-scale climatic anomalies coincide with changes in the foraging behaviour and populations dynamics of king penguins in the Southern hemisphere. |
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Programme |
109 |
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ISSN |
2041-1723 |
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Approved |
yes |
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Call Number |
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Serial |
6305 |
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Author |
Bailleul Frédéric, Authier Matthieu, Ducatez Simon, Roquet Fabien, Charrassin Jean-Benoît, Cherel Yves, Guinet Christophe, |
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Title |
Looking at the unseen: combining animal bio-logging and stable isotopes to reveal a shift in the ecological niche of a deep diving predator
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Type |
Journal Article |
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Year |
2010 |
Publication |
Ecography |
Abbreviated Journal |
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Volume |
33 |
Issue |
4 |
Pages |
709 -719 |
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Keywords |
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Abstract |
Understanding how marine top predators exploit their environment is a central topic in marine ecology. Among all methodologies used to investigate this part of ecology, electronic devices are very useful to track animals' movements and foraging habitats, but they do not provide any dietary information. Stable isotopes provide information on trophic levels but remain imprecise to identify small spatial-scale habitats. In this study, we combined the two approaches to obtain a synoptic view of the foraging behaviour variability of southern elephant seals Mirounga leonina. Our results suggested marked differences in distribution, diving behaviour, foraging habitats, trophic levels, and dietary habits of elephant seals according to their sex and age. Thus, we characterized main foraging habitats over the Kerguelen-Heard Plateau and the Antarctic shelf for juvenile males, while females foraged mainly in oceanic waters of the Polar Frontal Zone and the Antarctic Zone. In addition, we highlighted the ontogeny of niche partitioning in this sexually dimorphic species. While females did not exhibit a major dietary shift in relation to their age and their breeding status, a different picture emerged for males. Young males had a trophic level identical to that of all females. However, at 34yr of age, males showed a progressive increase in trophic level. The inter-annual combination of bio-logging and stable isotopes could provide a powerful tool to investigate possible shifts in ecological niche between years according to environmental changes.
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Programme |
109 |
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Blackwell Publishing Ltd |
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ISSN |
1600-0587 |
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Approved |
yes |
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Call Number |
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Serial |
463 |
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| Permanent link to this record |
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Author |
Bailleul Frédéric, Authier Matthieu, Ducatez Simon, Roquet Fabien, Charrassin Jean-Benoît, Cherel Yves, Guinet Christophe, |
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| |
Title |
Looking at the unseen: combining animal bio-logging and stable isotopes to reveal a shift in the ecological niche of a deep diving predator
|
Type |
Journal Article |
| |
Year |
2010 |
Publication |
Ecography |
Abbreviated Journal |
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| |
Volume |
33 |
Issue |
4 |
Pages |
709 -719 |
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| |
Keywords |
|
|
| |
Abstract |
Understanding how marine top predators exploit their environment is a central topic in marine ecology. Among all methodologies used to investigate this part of ecology, electronic devices are very useful to track animals' movements and foraging habitats, but they do not provide any dietary information. Stable isotopes provide information on trophic levels but remain imprecise to identify small spatial-scale habitats. In this study, we combined the two approaches to obtain a synoptic view of the foraging behaviour variability of southern elephant seals Mirounga leonina. Our results suggested marked differences in distribution, diving behaviour, foraging habitats, trophic levels, and dietary habits of elephant seals according to their sex and age. Thus, we characterized main foraging habitats over the Kerguelen-Heard Plateau and the Antarctic shelf for juvenile males, while females foraged mainly in oceanic waters of the Polar Frontal Zone and the Antarctic Zone. In addition, we highlighted the ontogeny of niche partitioning in this sexually dimorphic species. While females did not exhibit a major dietary shift in relation to their age and their breeding status, a different picture emerged for males. Young males had a trophic level identical to that of all females. However, at 34yr of age, males showed a progressive increase in trophic level. The inter-annual combination of bio-logging and stable isotopes could provide a powerful tool to investigate possible shifts in ecological niche between years according to environmental changes.
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Programme |
452 |
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Publisher |
Blackwell Publishing Ltd |
Place of Publication |
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Language |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1600-0587 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
1957 |
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| Permanent link to this record |
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Author |
Mathilde Chevallay, Christophe Guinet, Tiphaine Jeanniard-Du-Dot |
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Title |
Should I stay or should I go? Behavioral adjustments of fur seals related to foraging success |
Type |
Journal |
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Year |
2022 |
Publication |
Behavioral Ecology |
Abbreviated Journal |
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Volume |
33 |
Issue |
3 |
Pages |
634-643 |
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Keywords |
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Abstract |
Understanding foraging strategies and decision-making processes of predators provide crucial insights into how they might respond to changes in prey availability and in their environment to maximize their net energy input. In this work, foraging strategies of Antarctic fur seals (Arctocephalus gazella, AFS) and Northern fur seals (Callorhinus ursinus, NFS) were studied to determine how they adjust their foraging behavior according to their past prey capture experiences. AFS on Kerguelen Islands are exclusively oceanic divers, while NFS population of St Paul Island shows both oceanic and neritic divers. We thus hypothesized that the two species would respond differently to a change in prey capture success depending on their foraging strategy. To test this, 40 females were equipped with tags that measured tri-axial acceleration, dive depth, and GPS coordinates, from which we derived prey capture attempts and behavioral metrics. Influence of prey capture success on horizontal and vertical movements of seals was investigated at different time scales: multi-dive, night, and trip. Both AFS and NFS traveled further during the day if they encountered low prey capture periods during the previous night. However, at the multi-dive scale, neritic NFS differed from oceanic NFS and AFS in terms of decision-making processes, e.g., both AFS and oceanic NFS dived deeper in response to low prey capture rate periods, while neritic NFS did not. Similarities in decision-making processes between NFS and AFS foraging on pelagic prey suggest that pelagic vs. neritic prey type is a key factor in defining foraging decisions of diving marine predators. |
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Programme |
109 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1465-7279 |
ISBN |
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yes |
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Call Number |
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Serial |
8435 |
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Author |
I.C. Barrio, D. Ehrich, E.M. Soininen, V.T. Ravolainen, C.G. Bueno, O. Gilg, A.M. Koltz, J.D.M. Speed, D.S. Hik, M. Mörsdorf, J.M. Alatalo, A. Angerbjörn, J. Bêty, L. Bollache, N. Boulanger-Lapointe, G.S. Brown, I. Eischeid, M.A. Giroux, T. Hájek, B.B. Hansen, S.P. Hofhuis, J.-F. Lamarre, J. Lang, C. Latty, N. Lecomte, P. Macek, L. McKinnon, I.H. Myers-Smith, Å.Ø. Pedersen, J.S. Prevéy, J.D. Roth, S.T. Saalfeld, N.M. Schmidt, P. Smith, A. Sokolov, N. Sokolova, C. Stolz, R. van Bemmelen, Ø. Varpe, P.F. Woodard, I.S. Jónsdóttir |
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Title |
Developing common protocols to measure tundra herbivory across spatial scales |
Type |
Journal |
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Year |
2022 |
Publication |
Arctic Science |
Abbreviated Journal |
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Volume |
8 |
Issue |
3 |
Pages |
638-679 |
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Keywords |
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Abstract |
Understanding and predicting large-scale ecological responses to global environmental change requires comparative studies across geographic scales with coordinated efforts and standardized methodologies. We designed, applied, and assessed standardized protocols to measure tundra herbivory at three spatial scales: plot, site (habitat), and study area (landscape). The plot- and site-level protocols were tested in the field during summers 2014–2015 at 11 sites, nine of them consisting of warming experimental plots included in the International Tundra Experiment (ITEX). The study area protocols were assessed during 2014–2018 at 24 study areas across the Arctic. Our protocols provide comparable and easy to implement methods for assessing the intensity of invertebrate herbivory within ITEX plots and for characterizing vertebrate herbivore communities at larger spatial scales. We discuss methodological constraints and make recommendations for how these protocols can be used and how sampling effort can be optimized to obtain comparable estimates of herbivory, both at ITEX sites and at large landscape scales. The application of these protocols across the tundra biome will allow characterizing and comparing herbivore communities across tundra sites and at ecologically relevant spatial scales, providing an important step towards a better understanding of tundra ecosystem responses to large-scale environmental change. |
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Programme |
1036 |
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Approved |
yes |
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Call Number |
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Serial |
8339 |
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| Permanent link to this record |
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Author |
H. Angot, O. Magand, D. Helmig, P. Ricaud, B. Quennehen, H. Gallée, M. Del Guasta, F. Sprovieri, N. Pirrone, J. Savarino, A. Dommergue |
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Title |
New insights into the atmospheric mercury cycling in central Antarctica and implications on a continental scale |
Type |
Journal |
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Year |
2016 |
Publication |
Atmos. chem. phys. |
Abbreviated Journal |
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| |
Volume |
16 |
Issue |
13 |
Pages |
8249-8264 |
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Keywords |
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Abstract |
Under the framework of the GMOS project (Global Mercury Observation System) atmospheric mercury monitoring has been implemented at Concordia Station on the high-altitude Antarctic plateau (75°06′ S, 123°20′ E, 3220 m above sea level). We report here the first year-round measurements of gaseous elemental mercury (Hg(0)) in the atmosphere and in snowpack interstitial air on the East Antarctic ice sheet. This unique data set shows evidence of an intense oxidation of atmospheric Hg(0) in summer (24-hour daylight) due to the high oxidative capacity of the Antarctic plateau atmosphere in this period of the year. Summertime Hg(0) concentrations exhibited a pronounced daily cycle in ambient air with maximal concentrations around midday. Photochemical reactions and chemical exchange at the air–snow interface were prominent, highlighting the role of the snowpack on the atmospheric mercury cycle. Our observations reveal a 20 to 30 % decrease of atmospheric Hg(0) concentrations from May to mid-August (winter, 24 h darkness). This phenomenon has not been reported elsewhere and possibly results from the dry deposition of Hg(0) onto the snowpack. We also reveal the occurrence of multi-day to weeklong atmospheric Hg(0) depletion events in summer, not associated with depletions of ozone, and likely due to a stagnation of air masses above the plateau triggering an accumulation of oxidants within the shallow boundary layer. Our observations suggest that the inland atmospheric reservoir is depleted in Hg(0) in summer. Due to katabatic winds flowing out from the Antarctic plateau down the steep vertical drops along the coast and according to observations at coastal Antarctic stations, the striking reactivity observed on the plateau most likely influences the cycle of atmospheric mercury on a continental scale. |
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Programme |
1028 |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1680-7324 |
ISBN |
1680-7324 |
Medium |
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Area |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
6591 |
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| Permanent link to this record |
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Author |
Angot, H., Magand, O., Helmig, D., Ricaud, P., Quennehen, B., Gallée, H., Del Guasta, M., Sprovieri, F., Pirrone, N., Savarino, J., and Dommergue, A. |
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Title |
New insights into the atmospheric mercury cycling in central Antarctica and implications on a continental scale |
Type |
Journal Article |
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Year |
2016 |
Publication |
ATMOSPHERIC CHEMISTRY AND PHYSICS |
Abbreviated Journal |
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Volume |
16 |
Issue |
13 |
Pages |
8249-8264 |
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Keywords |
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Abstract |
Under the framework of the GMOS project (Global Mercury Observation System) atmospheric mercury monitoring has been implemented at Concordia Station on the high-altitude Antarctic plateau (75°06′ S, 123°20′ E, 3220 m above sea level). We report here the first year-round measurements of gaseous elemental mercury (Hg(0)) in the atmosphere and in snowpack interstitial air on the East Antarctic ice sheet. This unique data set shows evidence of an intense oxidation of atmospheric Hg(0) in summer (24-hour daylight) due to the high oxidative capacity of the Antarctic plateau atmosphere in this period of the year. Summertime Hg(0) concentrations exhibited a pronounced daily cycle in ambient air with maximal concentrations around midday. Photochemical reactions and chemical exchange at the air–snow interface were prominent, highlighting the role of the snowpack on the atmospheric mercury cycle. Our observations reveal a 20 to 30 % decrease of atmospheric Hg(0) concentrations from May to mid-August (winter, 24 h darkness). This phenomenon has not been reported elsewhere and possibly results from the dry deposition of Hg(0) onto the snowpack. We also reveal the occurrence of multi-day to weeklong atmospheric Hg(0) depletion events in summer, not associated with depletions of ozone, and likely due to a stagnation of air masses above the plateau triggering an accumulation of oxidants within the shallow boundary layer. Our observations suggest that the inland atmospheric reservoir is depleted in Hg(0) in summer. Due to katabatic winds flowing out from the Antarctic plateau down the steep vertical drops along the coast and according to observations at coastal Antarctic stations, the striking reactivity observed on the plateau most likely influences the cycle of atmospheric mercury on a continental scale. |
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Programme |
910 |
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Campaign |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISSN |
1680-7316 |
ISBN |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
6446 |
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| Permanent link to this record |
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Author |
H. Angot, I. Dion, N. Vogel, M. Legrand, O. Magand, A. Dommergue |
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Title |
Multi-year record of atmospheric mercury at Dumont d'Urville, East Antarctic coast: continental outflow and oceanic influences |
Type |
Journal |
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Year |
2016 |
Publication |
Atmos. chem. phys. |
Abbreviated Journal |
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Volume |
16 |
Issue |
13 |
Pages |
8265-8279 |
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Keywords |
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Abstract |
Under the framework of the Global Mercury Observation System (GMOS) project, a 3.5-year record of atmospheric gaseous elemental mercury (Hg(0)) has been gathered at Dumont d'Urville (DDU, 66°40′ S, 140°01′ E, 43 m above sea level) on the East Antarctic coast. Additionally, surface snow samples were collected in February 2009 during a traverse between Concordia Station located on the East Antarctic plateau and DDU. The record of atmospheric Hg(0) at DDU reveals particularities that are not seen at other coastal sites: a gradual decrease of concentrations over the course of winter, and a daily maximum concentration around midday in summer. Additionally, total mercury concentrations in surface snow samples were particularly elevated near DDU (up to 194.4 ng L−1) as compared to measurements at other coastal Antarctic sites. These differences can be explained by the more frequent arrival of inland air masses at DDU than at other coastal sites. This confirms the influence of processes observed on the Antarctic plateau on the cycle of atmospheric mercury at a continental scale, especially in areas subject to recurrent katabatic winds. DDU is also influenced by oceanic air masses and our data suggest that the ocean plays a dual role on Hg(0) concentrations. The open ocean may represent a source of atmospheric Hg(0) in summer whereas the sea-ice surface may provide reactive halogens in spring that can oxidize Hg(0). This paper also discusses implications for coastal Antarctic ecosystems and for the cycle of atmospheric mercury in high southern latitudes. |
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Programme |
1028 |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1680-7324 |
ISBN |
1680-7324 |
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yes |
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Call Number |
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Serial |
6594 |
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Author |
Biermann L, Guinet C, Bester M, Brierley A, Boehme L, |
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Title |
An alternative method for correcting fluorescence quenching |
Type |
Journal Article |
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Year |
2015 |
Publication |
Ocean Sci. |
Abbreviated Journal |
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Volume |
11 |
Issue |
1 |
Pages |
83-91 |
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Keywords |
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Abstract |
Under high light intensity, phytoplankton protect their photosystems from bleaching through non-photochemical quenching processes. The consequence of this is suppression of fluorescence emission, which must be corrected when measuring in situ yield with fluorometers. We present data from the Southern Ocean, collected over five austral summers by 19 southern elephant seals tagged with fluorometers. Conventionally, fluorescence data collected during the day (quenched) were corrected using the limit of the mixed layer, assuming that phytoplankton are uniformly mixed from the surface to this depth. However, distinct deep fluorescence maxima were measured in approximately 30% of the night (unquenched) data. To account for the evidence that chlorophyll is not uniformly mixed in the upper layer, we propose correcting from the limit of the euphotic zone, defined as the depth at which photosynthetically available radiation is ~ 1% of the surface value. Mixed layer depth exceeded euphotic depth over 80% of the time. Under these conditions, quenching was corrected from the depth of the remotely derived euphotic zone Zeu, and compared with fluorescence corrected from the depth of the density-derived mixed layer. Deep fluorescence maxima were evident in only 10% of the day data when correcting from mixed layer depth. This was doubled to 21% when correcting from Zeu, more closely matching the unquenched (night) data. Furthermore, correcting from Zeu served to conserve non-uniform chlorophyll features found between the 1% light level and mixed layer depth. |
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Programme |
109 |
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ISSN |
1812-0792 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
6304 |
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Author |
Guillaume Bridier, Frédéric Olivier, Laurent Chauvaud, Mikael K. Sejr, Jacques Grall |
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Title |
Food source diversity, trophic plasticity, and omnivory enhance the stability of a shallow benthic food web from a high-Arctic fjord exposed to freshwater inputs |
Type |
Journal |
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Year |
2021 |
Publication |
Limnology and Oceanography |
Abbreviated Journal |
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Volume |
66 |
Issue |
S1 |
Pages |
S259-S272 |
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Keywords |
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Abstract |
Under climate change, many Arctic coastal ecosystems receive increasing amounts of freshwater, with ecological consequences that remain poorly understood. In this study, we investigated how freshwater inputs may affect the small-scale structure of benthic food webs in a low-production high-Arctic fjord (Young Sound, NE Greenland). We seasonally sampled benthic invertebrates from two stations receiving contrasting freshwater inputs: an inner station exposed to turbid and nutrient-depleted freshwater flows and an outer station exposed to lower terrestrial influences. Benthic food web structure was described using a stable isotope approach (δ13C and δ15N), Bayesian models, and community-wide metrics. The results revealed the spatially and temporally homogeneous structure of the benthic food web, characterized by high trophic diversity (i.e., a wide community isotopic niche). Such temporal stability and spatial homogeneity mirrors the high degree of trophic plasticity and omnivory of benthic consumers that allows the maintenance of several carbon pathways through the food web despite different food availability. Furthermore, potential large inputs of shelf organic matter together with local benthic primary production (i.e., macroalgae and presumably microphytobenthos) may considerably increase the stability of the benthic food web by providing alternative food sources to locally runoff-impacted pelagic primary production. Future studies should assess beyond which threshold limit a larger increase in freshwater inputs might cancel out these stability factors and lead to marked changes in Arctic benthic ecosystems. |
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1158 |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1939-5590 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
6791 |
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| Permanent link to this record |
