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Title |
Summer variability of the atmospheric NO2 : ?NO ratio at Dome C on the East Antarctic Plateau |
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Journal |
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Year |
2022 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
22 |
Issue |
18 |
Pages |
12025-12054 |
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1177 |
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ISSN |
1680-7316 |
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yes |
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Serial  |
8591 |
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Title |
Stage-dependent niche segregation: insights from a multi-dimensional approach of two sympatric sibling seabirds |
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Journal |
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Year |
2022 |
Publication |
Oecologia |
Abbreviated Journal |
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Volume |
199 |
Issue |
3 |
Pages |
537-548 |
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Keywords |
Diving petrel Foraging and diving behaviour Niche partitioning Pelecanoides Trophic niche |
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Abstract |
Niche theory predicts that to reduce competition for the same resource, sympatric ecologically similar species should exploit divergent niches and segregate in one or more dimensions. Seasonal variations in environmental conditions and energy requirements can influence the mechanisms and the degree of niche segregation. However, studies have overlooked the multi-dimensional aspect of niche segregation over the whole annual cycle, and key facets of species co-existence still remain ambiguous. The present study provides insights into the niche use and partitioning of two morphologically and ecologically similar seabirds, the common (CDP, Pelecanoides urinatrix) and the South Georgian diving petrel (SGDP, Pelecanoides georgicus). Using phenology, at-sea distribution, diving behavior and isotopic data (during the incubation, chick-rearing and non-breeding periods), we show that the degree of partitioning was highly stage-dependent. During the breeding season, the greater niche segregation during chick-rearing than incubation supported the hypothesis that resource partitioning increases during energetically demanding periods. During the post breeding period, while species-specific latitudinal differences were expected (species specific water mass preference), CDP and SGDP also migrated in divergent directions. This segregation in migration area may not be only a response to the selective pressure arising from competition avoidance between sympatric species, but instead, could reflect past evolutionary divergence. Such stage-dependent and context-dependent niche segregation demonstrates the importance of integrative approaches combining techniques from different fields, throughout the entire annual cycle, to better understand the co-existence of ecologically similar species. This is particularly relevant in order to fully understand the short and long-term effects of ongoing environmental changes on species distributions and communities. |
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109,394 |
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Thesis |
Bachelor's thesis |
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ISSN |
1432-1939 |
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yes |
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Serial |
8590 |
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Title |
Species- and site-specific circulating bacterial DNA in Subantarctic sentinel mussels Aulacomya atra and Mytilus platensis |
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Journal |
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Year |
2022 |
Publication |
Scientific Reports |
Abbreviated Journal |
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Volume |
12 |
Issue |
1 |
Pages |
9547 |
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Keywords |
Ecology Microbial ecology |
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Abstract |
Impacts of climate changes are particularly severe in polar regions where warmer temperatures and reductions in sea-ice covers threaten the ecological integrity of marine coastal ecosystems. Because of their wide distribution and their ecological importance, mussels are currently used as sentinel organisms in monitoring programs of coastal ecosystems around the world. In the present study, we exploited the concept of liquid biopsy combined to a logistically friendly sampling method to study the hemolymphatic bacterial microbiome in two mussel species (Aulacomya atra and Mytilus platensis) in Kerguelen Islands, a remote Subantarctic volcanic archipelago. We found that the circulating microbiome signatures of both species differ significantly even though their share the same mussel beds. We also found that the microbiome differs significantly between sampling sites, often correlating with the particularity of the ecosystem. Predictive models also revealed that both species have distinct functional microbiota, and that the circulating microbiome of Aulacomya atra was more sensitive to changes induced by acute thermal stress when compared to Mytilus platensis. Taken together, our study suggests that defining circulating microbiome is a useful tool to assess the health status of marine ecosystems and to better understand the interactions between the sentinel species and their habitat. |
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1044 |
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Edition |
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ISSN |
2045-2322 |
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Approved |
yes |
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Call Number |
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Serial |
8589 |
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Author |
Georg Lackner, Florent Domine, Daniel F. Nadeau, Matthieu Lafaysse, Marie Dumont |
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Title |
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Journal |
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Year |
2022 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
16 |
Issue |
8 |
Pages |
3357-3373 |
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Abstract |
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Programme |
1042 |
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ISSN |
1994-0416 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8588 |
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Author |
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Title |
Serpentinization of mantle xenoliths in Kerguelen archipelago: A first petrographic and geochemical study |
Type |
Journal |
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Year |
2022 |
Publication |
Lithos |
Abbreviated Journal |
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Volume |
428-429 |
Issue |
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Pages |
106796 |
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Keywords |
Fluid composition Fluid origin Kerguelen Mantle xenoliths Serpentinization |
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Abstract |
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Programme |
1077 |
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Series Editor |
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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 |
0024-4937 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8587 |
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Author |
Stuart Russell, Jessica C. E. Irving, Sanne Cottaar |
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Title |
Seismic visibility of melt at the core-mantle boundary from PKKP diffracted waves |
Type |
Journal |
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Year |
2022 |
Publication |
Earth and Planetary Science Letters |
Abbreviated Journal |
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Volume |
595 |
Issue |
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Pages |
117768 |
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Keywords |
core-mantle boundary lower mantle melt PKKP diffracted seismic visibility |
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Abstract |
The core-mantle boundary (CMB) is a complex and poorly understood region of the Earth. The existence of melt or partial melt at the CMB is strongly debated with evidence coming from a range of sources. While partial melt has been inferred in specific locations using seismology, often as an explanation for ultra-low velocity zones (ULVZs), no global layer of melt has been observed despite evidence that such melt should accumulate at the CMB. Using high frequency synthetic seismograms we have systematically examined the effect of a one-dimensional melt layer at the CMB on the global seismic wavefield. We find that PKKP diffracted waves are an extremely sensitive, robust and previously underutilised seismic phase for studying the CMB and, in synthetic testing, could resolve very thin melt layers. We have constructed a global data set of PKKP diffracted observations to attempt to observe or exclude melt at the CMB. We find that within the bounds of our data, we are unable to robustly exclude or observe a melt layer at the CMB on the order of single kilometres thick. The presence of a thin layer of unobservable melt at the CMB would have profound impacts for the internal dynamics of the Earth. |
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Programme |
133 |
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Series Issue |
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Edition |
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ISSN |
0012-821X |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8586 |
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Author |
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Title |
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Journal |
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Year |
2022 |
Publication |
PaleoAmerica |
Abbreviated Journal |
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Volume |
8 |
Issue |
1 |
Pages |
29-52 |
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Keywords |
Brazil geofacts Late Glacial Maximum Pedra Furada Peopling of the Americas |
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Abstract |
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Programme |
1217 |
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Series Issue |
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Edition |
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ISSN |
2055-5563 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8585 |
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Author |
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Title |
Predator-derived bioregions in the Southern Ocean: Characteristics, drivers and representation in marine protected areas |
Type |
Journal |
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Year |
2022 |
Publication |
Biological Conservation |
Abbreviated Journal |
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Volume |
272 |
Issue |
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Pages |
109630 |
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Keywords |
Antarctica Biogeography Conservation Management MPA Subantarctic |
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Abstract |
Multiple initiatives have called for large-scale representative networks of marine protected areas (MPAs). MPAs should be ecologically representative to be effective, but in large, remote regions this can be difficult to quantify and assess. We present a novel bioregionalization for the Southern Ocean, which uses the modelled circumpolar habitat importance of 17 marine bird and mammal species. The habitat-use of these predators indicates biodiversity patterns that require representation in Southern Ocean conservation and management planning. In the predator habitat importance predictions, we identified 17 statistical clusters, falling into four larger groups. We characterized and contrasted these clusters based on their predator, prey and oceanographic characteristics. Under the existing Southern Ocean MPA network, some clusters fall short of 10 % representation, yet others meet or exceed these targets. Implementation of currently proposed MPAs can in some cases contribute to meeting even 30 % spatial coverage conservation targets. However, the effectiveness of mixed-use versus no-take MPAs should be taken into consideration, since some clusters are not adequately represented by no-take MPAs. These results, combined with previous studies in the Southern Ocean, can help inform the continued design, implementation, and evaluation of a representative system of MPAs for Southern Ocean conservation and management. |
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Programme |
1182 |
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ISSN |
0006-3207 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8584 |
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Author |
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Title |
Photolytic modification of seasonal nitrate isotope cycles in East Antarctica |
Type |
Journal |
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Year |
2022 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
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Volume |
22 |
Issue |
24 |
Pages |
15637-15657 |
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Keywords |
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Abstract |
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Programme |
1177 |
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Series Editor |
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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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Approved |
yes |
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Call Number |
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Serial |
8583 |
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Author |
Fionnuala R. McCully, Henri Weimerskirch, Stephen J. Cornell, Ben J. Hatchwell, Milena Cairo, Samantha C. Patrick |
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Title |
Partner intrinsic characteristics influence foraging trip duration, but not coordination of care in wandering albatrosses Diomedea exulans |
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Journal |
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Year |
2022 |
Publication |
Ecology and Evolution |
Abbreviated Journal |
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Volume |
12 |
Issue |
12 |
Pages |
e9621 |
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Keywords |
albatrosses behavioral coordination foraging bout nest attendance parental care personality seabirds |
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Abstract |
Long-lived monogamous species gain long-term fitness benefits by equalizing effort during biparental care. For example, many seabird species coordinate care by matching foraging trip durations within pairs. Age affects coordination in some seabird species; however, the impact of other intrinsic traits, including personality, on potential intraspecific variation in coordination strength is less well understood. The impacts of pair members' intrinsic traits on trip duration and coordination strength were investigated using data from saltwater immersion loggers deployed on 71 pairs of wandering albatrosses Diomedea exulans. These were modeled against pair members' age, boldness, and their partner's previous trip duration. At the population level, the birds exhibited some coordination of parental care that was of equal strength during incubation and chick-brooding. However, there was low variation in coordination between pairs and coordination strength was unaffected by the birds' boldness or age in either breeding stage. Surprisingly, during incubation, foraging trip duration was mainly driven by partner traits, as birds which were paired to older and bolder partners took shorter trips. During chick-brooding, shorter foraging trips were associated with greater boldness in focal birds and their partners, but age had no effect. These results suggest that an individual's assessment of their partner's capacity or willingness to provide care may be a major driver of trip duration, thereby highlighting the importance of accounting for pair behavior when studying parental care strategies. |
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Programme |
109 |
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Edition |
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ISSN |
2045-7758 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8582 |
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| Permanent link to this record |
