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Bosqued J M, Ashour-Abdalla M, Umeda T, El Alaoui M, Peroomian V, Frey H U, Marchaudon A, Laakso H, . (2009). Cluster observations and numerical modeling of energy-dispersed ionospheric H+ ions bouncing at the plasma sheet boundary layer
. J. Geophys. Res., 114(A4), A04216–.
Keywords: dispersed structures, 2704 Magnetospheric Physics: Auroral phenomena, 2736 Magnetospheric Physics: Magnetosphere/ionosphere interactions, 2455 Ionosphere: Particle precipitation, 2463 Ionosphere: Plasma convection, 2753 Magnetospheric Physics: Numerical modeling,
Programme: 312;911
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Gauthier Gilles, Milot Emmanuel, Weimerskirch Henri, . (2012). Estimating dispersal, recruitment and survival in a biennially breeding species, the Wandering Albatross
. J. Ornithol., 152(2), 457–467-.
Keywords: Dispersal, Philopatry, Recruitment, Multistate model, Unobservable state,
Programme: 109
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Christophe Barbraud, Karine Delord. (2021). Selection against immigrants in wild seabird populations (Vol. 24).
Keywords: Dispersal fitness immigrant seabirds sex-biased dispersal
Programme: 109
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. (2017). Around the pole: evolution of sub?Antarctic Ranunculus (Vol. 44). Bachelor's thesis, , .
Abstract: Abstract Aim Despite an improved understanding of Southern Hemisphere plant biogeography, the origins and evolution of sub?Antarctic floras remain poorly studied. Here, we investigate the historical biogeography of sub?Antarctic representatives of the genus Ranunculus. We aimed to establish when and from where the sub?Antarctic ranunculi originated as well as to examine the extent to which ecomorphological traits explain contemporary biogeographical patterns. Location Southern temperate and sub?Antarctic zones. Methods We first estimated a dated phylogeny for Ranunculus using combined chloroplast and nuclear data for 53 accessions; divergence times were inferred based on three temporal calibrations. We then used non?parametric multidimensional scaling to evaluate the ecomorphological diversity of 67 austral ranunculi representing a combination of sub?Antarctic species and those restricted to lower latitude landmasses. Results Phylogenetic analyses indicated that several Ranunculus lineages have colonized the sub?Antarctic islands. Divergence time estimates suggest recent arrival from source areas in Australia, New Zealand or South America. Species exhibiting two distinct ecomorphological trait combinations occur in both sub?Antarctic and lower latitude habitats; the proportions of each combination differed significantly between these areas. Main conclusions Ranunculus has colonized the sub?Antarctic on several occasions, most often arriving from the lower latitude landmasses prior to the Last Glacial Maximum. Taken together our analyses suggest that chance effects are likely to have influenced species arrival. However, following arrival trait?environment interactions appear to have been important for the subsequent establishment and persistence of ranunculi in sub?Antarctic habitats.
Keywords: dispersal divergence time estimates ecomorphology historical biogeography phylogenetic biogeography Ranunculus sub?Antarctic islands
Programme: 136,1116
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Ardhuin Fabrice, Stutzmann Eleonore, Schimmel Martin, Mangeney Anne, . (2011). Ocean wave sources of seismic noise
. J. Geophys. Res., 116(C9), C09004–.
Abstract: Noise with periods 3 to 10 s, ubiquitous in seismic records, is expected to be mostly generated by pairs of ocean wave trains of opposing propagation directions with half the seismic frequency. Here we present the first comprehensive numerical model of microseismic generation by random ocean waves, including ocean wave reflections. Synthetic and observed seismic spectra are well correlated (r > 0.85). On the basis of the model results, noise generation events can be clustered in three broad classes: wind waves with a broad directional spectrum (class I), sea states with a significant contribution of coastal reflections (class II), and the interaction of two independent wave systems (class III). At seismic stations close to western coasts, noise generated by class II sources generally dominates, but it is intermittently outshined by the intense class III sources, limiting the reliability of seismic data as a proxy for storm climates. The modeled seismic noise critically depends on the damping of seismic waves. At some mid-ocean island stations, low seismic damping is necessary to reproduce the observed high level and smoothness of noise time series that result from a spatial integration of sources over thousands of kilometers. In contrast, some coastal stations are only sensitive to noise within a few hundreds of kilometers. This revelation of noise source patterns worldwide provides a wealth of information for seismic studies, wave climate applications, and new constraints on the possible directional distribution of wave energy.
Keywords: directional wave spectra, ocean waves, seismic noise, wave model, 4259 Ocean acoustics, 4544 Internal and inertial waves, 4560 Surface waves and tides, 7220 Oceanic crust, 7255 Surface waves and free oscillations,
Programme: 133
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Ardhuin Fabrice, Balanche Abel, Stutzmann E, Obrebski Mathias, . (2012). From seismic noise to ocean wave parameters: General methods and validation
. Journal of Geophysical Research: Oceans, 117(C5), C05002–.
Keywords: directional spectrum, microseisms, ocean waves, 4546 Nearshore processes, 4560 Surface waves and tides, 4594 Instruments and techniques, 7219 Seismic monitoring and test-ban treaty verification, 7255 Surface waves and free oscillations,
Programme: 133
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Weimerskirch Henri, Cherel Yves, Delord Karine, Jaeger Audrey, Patrick Samantha C, Riotte-Lambert Louise, . (2014). Lifetime foraging patterns of the wandering albatross: Life on the move!
. J. Exp. Mar. Biol. Ecol., 450, 68–78.
Keywords: Diomedea exulans, Foraging movements, Lifetime distribution,
Programme: 109
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Sophie de Grissac, Frederic Bartumeus, Sam L. Cox, Henri Weimerskirch. (2017). Early-life foraging: Behavioral responses of newly fledged albatrosses to environmental conditions (Vol. 7).
Abstract: In order to survive and later recruit into a population, juvenile animals need to acquire resources through the use of innate and/or learnt behaviors in an environment new to them. For far-ranging marine species, such as the wandering albatross Diomedea exulans, this is particularly challenging as individuals need to be able to rapidly adapt and optimize their movement strategies in response to the highly dynamic and heterogeneous nature of their open-ocean pelagic habitats. Critical to this is the development and flexibility of dispersal and exploratory behaviors. Here, we examine the movements of eight juvenile wandering albatrosses, tracked using GPS/Argos satellite transmitters for eight months following fledging, and compare these to the trajectories of 17 adults to assess differences and similarities in behavioral strategies through time. Behavioral clustering algorithms (Expectation Maximization binary Clustering) were combined with multinomial regression analyses to investigate changes in behavioral mode probabilities over time, and how these may be influenced by variations in day duration and in biophysical oceanographic conditions. We found that juveniles appeared to quickly acquire the same large-scale behavioral strategies as those employed by adults, although generally more time was spent resting at night. Moreover, individuals were able to detect and exploit specific oceanographic features in a manner similar to that observed in adults. Together, the results of this study suggest that while shortly after fledging juvenile wandering albatrosses are able to employ similar foraging strategies to those observed in adults, additional skills need to be acquired during the immature period before the efficiency of these behaviors matches that of adults.
Keywords: Diomedea exulans ecology juveniles learning seabirds tracking
Programme: 109
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. (2017). Contrasting effects of climate and population density over time and life stages in a long-lived seabird (Vol. 31).
Keywords: Diomedea exulans early-life vital rate juvenile survival long-term effect recruitment age
Programme: 109
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RIVALAN PHILIPPE, BARBRAUD CHRISTOPHE, INCHAUSTI PABLO, WEIMERSKIRCH HENRI, . (2010). Combined impacts of longline fisheries and climate on the persistence of the Amsterdam Albatross Diomedia amsterdamensis
. Ibis (Lond. 1859), 152(1), 6–18.
Abstract: Incidental capture of seabirds in longline fishing gear is a central issue in the conservation of many long-lived marine species. Despite growing evidence of climate-induced effects on population trends of long-lived species, climate change remains generally overlooked in most risk assessments of seabirds. Because variation in climate may interact with the detrimental effects of bycatch, considering climate is of great importance, especially in the context of ongoing global warming. This paper examines the combined effects of bycatch and climate change on the persistence of one of the worlds rarest birds, the Amsterdam Albatross Diomedea amsterdamensis, which has a single population in the upland plateau of Amsterdam Island (Southeast Indian Ocean). Using continuous monitoring from 1983 onwards, we first estimated the relationship between climate and the species demographic parameters. We then built a stochastic matrix population model to estimate the population growth rate and the probability that the population declines below the level recorded in 1983 of nine breeding pairs under different scenarios involving the joint effects of additional mortality caused by longline fisheries and climate change. The results suggest that the demography of the Amsterdam Albatross is influenced by climate in both breeding and wintering grounds and that these relationships may to some extent compensate for the impact of additive bycatch mortality. However, these compensatory effects would be negligible if the annual additional mortality exceeds around six individuals per year, suggesting that the resumption of longline fishery in the foraging range of the Amsterdam Albatross would rapidly put this species at risk of extinction.
Keywords: Diomedea amsterdamensis, fishing effort, Indian Ocean Dipole, multistate capture-recapture models, stochastic matrix models,
Programme: 109
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