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Riotte-Lambert Louise, Weimerskirch Henri, . (2013). Do naive juvenile seabirds forage differently from adults?
. Proc. Biol. Sci., 280(1768), 20131434.
Abstract: Foraging skills of young individuals are assumed to be inferior to those of adults. The reduced efficiency of naive individuals may be the primary cause of the high juvenile mortality and explain the deferment of maturity in long-lived species. However, the study of juvenile and immature foraging behaviour has been limited so far. We used satellite telemetry to compare the foraging movements of juveniles, immatures and breeding adult wandering albatrosses Diomedea exulans, a species where foraging success is positively influenced by the distance covered daily. We showed that juveniles are able to use favourable winds as soon as the first month of independence, but cover shorter distances daily and spend more time sitting on water than adults during the first two months after fledging. These reduced movement capacities do not seem to be the cause of higher juvenile mortality. Moreover, juveniles almost never restrict their movement to specific areas, as adults and immatures frequently do over shelf edges or oceanic zones, which suggest that the location of appropriate areas is learned through experience. Immatures and adults have equivalent movement capacities, but when they are central place foragers, i.e. when adults breed or immatures come to the colony to display and pair, immatures make shorter trips than adults. The long duration of immaturity in this species seems to be related to a long period of learning to integrate the foraging constraints associated with reproduction and central place foraging. Our results indicate that foraging behaviour of young albatrosses is partly innate and partly learned progressively over immaturity. The first months of learning appear critical in terms of survival, whereas the long period of immaturity is necessary for young birds to attain the skills necessary for efficient breeding without fitness costs.
Keywords: albatross, immaturity, learning, movement, telemetry,
Programme: 109
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Goutte Aurélie, Cherel Yves, Houssais Marie-Noëlle, Klein Vincent, Ozouf-Costaz Catherine, Raccurt Mireille, Robineau Camille, Massé Guillaume, . (2013). Diatom-Specific Highly Branched Isoprenoids as Biomarkers in Antarctic Consumers . PLOS ONE, 8(2), e56504.
Abstract: The structure, functioning and dynamics of polar marine ecosystems are strongly influenced by the extent of sea ice. Ice algae and pelagic phytoplankton represent the primary sources of nutrition for higher trophic-level organisms in seasonally ice-covered areas, but their relative contributions to polar marine consumers remain largely unexplored. Here, we investigated the potential of diatom-specific lipid markers and highly branched isoprenoids (HBIs) for estimating the importance of these two carbon pools in an Antarctic pelagic ecosystem. Using GC-MS analysis, we studied HBI biomarkers in key marine species over three years in Adélie Land, Antarctica: euphausiids (ice krill Euphausia crystallorophias and Antarctic krill E. superba), fish (bald notothens Pagothenia borchgrevinki and Antarctic silverfish Pleuragramma antarcticum) and seabirds (Adélie penguins Pygoscelis adeliae, snow petrels Pagodroma nivea and cape petrels Daption capense). This study provides the first evidence of the incorporation of HBI lipids in Antarctic pelagic consumers. Specifically, a di-unsaturated HBI (diene) of sea ice origin was more abundant in ice-associated species than in pelagic species, whereas a tri-unsaturated HBI (triene) of phytoplanktonic origin was more abundant in pelagic species than in ice-associated species. Moreover, the relative abundances of diene and triene in seabird tissues and eggs were higher during a year of good sea ice conditions than in a year of poor ice conditions. In turn, the higher contribution of ice algal derived organic matter to the diet of seabirds was related to earlier breeding and higher breeding success. HBI biomarkers are a promising tool for estimating the contribution of organic matter derived from ice algae in pelagic consumers from Antarctica.
Programme: 109,131,1024
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MacIntosh Andrew J J, Pelletier Laure, Chiaradia Andre, Kato Akiko, Ropert-Coudert Yan, . (2013). Temporal fractals in seabird foraging behaviour: diving through the scales of time
. Scientific Reports, 3.
Keywords: Behavioural ecology, Scale invariance, Statistical physics, Theoretical ecology,
Programme: 1091
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. (2013). The K-derived MLT sector geomagnetic indices
. GEOPHYSICAL RESEARCH LETTERS, 40(18), 4808–4812.
Abstract: New sub-auroral K-derived sector indices are proposed. They are based upon the K local geomagnetic activity indices from the planetary am network stations, and their derivation scheme draws directly from that of am indices. Four Magnetic Local Time (MLT) sectors are considered, leading to four different K-derived MLT-sector indices: the aσDawn (03-09 MLT), aσNoon (09-15 MLT), aσDusk (15-21 MLT) and aσMidnight (21-03 MLT) indices. They cover more than 4 solar cycles and, thus, allow robust statistical analysis. Statistical studies of the whole aσ data series and case studies for two geomagnetic storms are presented. These analyses clearly show that the four aσ have specific behaviors, and that it is possible to get insight into both the statistical properties of the physical processes responsible for the observed geomagnetic activity and contribution to the dynamics of a given storm.
Keywords: 1530 Rapid time variations, 1555 Time variations: diurnal to decadal, 2784 Solar wind/magnetosphere interactions, 7954 Magnetic storms, geomagnetic indices, MLT sector (Magnetic Local Time sector),
Programme: 139
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. (2013). First investigations of IO, BrO, and NO2 summer atmospheric levels at a coastal East Antarctic site using mode-locked cavity enhanced absorption spectroscopy
. Geophysical Research Letters, 40(4), 791–796.
Keywords: 0365 Troposphere: composition and chemistry, Antarctica, Atmospheric oxidants, Radicals,
Programme: 414
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. (2013). An objective rationale for the choice of regularisation parameter with application to global multiple-frequency S-wave tomography
. Solid Earth, 4(2), 357–371.
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Martin Jodie, Rey Benjamin, Pons Jean-Baptiste, Natoli Eugenia, Pontier Dominique, . (2013). Movements and space use of feral cats in Kerguelen archipelago: a pilot study with GPS data
. 0722-4060, 36(10), 1531–1536.
Keywords: Activity rhythm, Ecology, Felis silvestris catus, Home range, Microbiology, Oceanography, Plant Sciences, Sub-Antarctic islands, Zoology,
Programme: 279
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Morata Nathalie, Michaud Emma, . (2013). Impact of early food input on the Arctic benthos activities during the polar night
. Polar Biol., , 1–16.
Keywords: Biogeochemical fluxes, Bioturbation, Ecology, Ecosystem functioning, Feeding experiment, Microbiology, Oceanography, Plant Sciences, Svalbard, Zoology,
Programme: 1092
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. (2013). The Dynamic Arctic Snow Pack: An Unexplored Environment for Microbial Diversity and Activity
. biology, 2(1), 317–330.
Abstract: The Arctic environment is undergoing changes due to climate shifts, receiving contaminants from distant sources and experiencing increased human activity. Climate change may alter microbial functioning by increasing growth rates and substrate use due to increased temperature. This may lead to changes of process rates and shifts in the structure of microbial communities. Biodiversity may increase as the Arctic warms and population shifts occur as psychrophilic/psychrotolerant species disappear in favor of more mesophylic ones. In order to predict how ecological processes will evolve as a function of global change, it is essential to identify which populations participate in each process, how they vary physiologically, and how the relative abundance, activity and community structure will change under altered environmental conditions. This review covers aspects of the importance and implication of snowpack in microbial ecology emphasizing the diversity and activity of these critical members of cold zone ecosystems.
Keywords: biogeochemical cycling, microbial ecology, snow, Arctic,
Programme: 399
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Siaussat D, Laparie M, Maria A, Renault D, . (2013). Heat shock protein responses to salinity, food deprivation, and temperature in the invasive ground beetle Merizodus soledadinus at the Kerguelen Islands
. POLAR BIOLOGY, 36(2), 201–209.
Keywords: Alien, Biological invasion, Ecology, HSC70, HSP70, Insect, Microbiology, Oceanography, Plant Sciences, Starvation, Sub-Antarctic islands, Survival, Zoology,
Programme: 136
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