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Hassen Allegue, Denis Réale, Baptiste Picard, Christophe Guinet. (2023). Track and dive-based movement metrics do not predict the number of prey encountered by a marine predator (Vol. 11). Bachelor's thesis, , .
Abstract: Studying animal movement in the context of the optimal foraging theory has led to the development of simple movement metrics for inferring feeding activity. Yet, the predictive capacity of these metrics in natural environments has been given little attention, raising serious questions of the validity of these metrics. The aim of this study is to test whether simple continuous movement metrics predict feeding intensity in a marine predator, the southern elephant seal (SES; Mirounga leonine), and investigate potential factors influencing the predictive capacity of these metrics.
Keywords: Accelerometry Area-restricted search Diving behavior Foraging behavior Marine predator Prey encounter events
Programme: 109,1201
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F. Orgeret, C. Péron, M. R. Enstipp, K. Delord, H. Weimerskirch, C. A. Bost. (2019). Exploration during early life: distribution, habitat and orientation preferences in juvenile king penguins (Vol. 7). Bachelor's thesis, , .
Abstract: The early life of marine apex predators is poorly known, particularly for diving species. The orientation and foraging skills are presumably less developed in juveniles than in adults, especially during their first year at sea when juveniles might disperse further than adults.
Programme: 109,394
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Sarah Kada, Karen D. McCoy, Thierry Boulinier. (2017). Impact of life stage-dependent dispersal on the colonization dynamics of host patches by ticks and tick-borne infectious agents (Vol. 10). Bachelor's thesis, , .
Abstract: When colonization and gene flow depend on host-mediated dispersal, a key factor affecting vector dispersal potential is the time spent on the host for the blood meal, a characteristic that can vary strongly among life history stages. Using a 2-patch vector-pathogen population model and seabird ticks as biological examples, we explore how vector colonization rates and the spread of infectious agents may be shaped by life stage-dependent dispersal. We contrast hard (Ixodidae) and soft (Argasidae) tick systems, which differ strongly in blood- feeding traits.
Keywords: Allee effect Borrelia burgdorferi Climate change Ixodes uriae Lyme disease Ornithodoros maritimus Parasite spread Range expansion Vertical transmission
Programme: 333,1151
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Hannah Joy Kriesell, Céline Le Bohec, Alexander F. Cerwenka, Moritz Hertel, Jean-Patrice Robin, Bernhard Ruthensteiner, Manfred Gahr, Thierry Aubin, Daniel Normen Düring. (2020). Vocal tract anatomy of king penguins: morphological traits of two-voiced sound production (Vol. 17). Bachelor's thesis, , .
Abstract: The astonishing variety of sounds that birds can produce has been the subject of many studies aiming to identify the underlying anatomical and physical mechanisms of sound production. An interesting feature of some bird vocalisations is the simultaneous production of two different frequencies. While most work has been focusing on songbirds, much less is known about dual-sound production in non-passerines, although their sound production organ, the syrinx, would technically allow many of them to produce “two voices”. Here, we focus on the king penguin, a colonial seabird whose calls consist of two fundamental frequency bands and their respective harmonics. The calls are produced during courtship and for partner and offspring reunions and encode the birds’ identity. We dissected, μCT-scanned and analysed the vocal tracts of six adult king penguins from Possession Island, Crozet Archipelago.
Programme: 119,137
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Julien Goebel, Marta Promerová, Francesco Bonadonna, Karen D. McCoy, Céline Serbielle, Maria Strandh, Glenn Yannic, Reto Burri, Luca Fumagalli. (2017). 100 million years of multigene family evolution: origin and evolution of the avian MHC class IIB (Vol. 18). Bachelor's thesis, , .
Abstract: Gene duplication has led to a most remarkable adaptation involved in vertebrates’ host-pathogen arms-race, the major histocompatibility complex (MHC). However, MHC duplication history is as yet poorly understood in non-mammalian vertebrates, including birds.
Keywords: Birds Birth-death evolution Concerted evolution Gene conversion Gene duplication Major histocompatibility complex Recombination
Programme: 333,354
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Ellis L.T., Ah-Peng C., Aranda S.C., Bednarek-Ochyra H., Borovichev E.A., Cykowska-Marzencka B., Duarte M.C., Enroth J., Erzberger P., Fedosov V., Fojcik B., Gabriel R., Coelho M.C.M., Henriques D.S.G., Ilina O.V., Gil-Novoa J.E., Morales-Puentes M.E., Gradstein S.R., Gupta R., Nath V., Asthana A.K., Koczur A., Lebouvier M., Mesterházy A., Mogro F., Mežaka A., Németh Cs., Orgaz J.D., Sakamoto Y., Paiva J., Sales F., Pande N., Sabovljević M.S., Pantivić J., Sabovljević A.D., Pérez-Haase A., Pinheiro da Costa D., Plášek V., Sawichi J., Szczecińska M., Chmielewski J., Potemkin A., Schäfer-Verwimp A., Schofield W.B., Sérgia C., Sim-Sim M., Sjögren S., Spitale D., Stebel A., Ştefănuţ S., Suárez G.M., Flores J.R., Thouvenot L., Váňa J., Yoon Y.-J., Kim J.H., Zubel R. (2015). New national and regional bryophyte records, 45. 0373-6687, 37, 308–329.
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Ellis L T, Alegro A, Bansal P, Nath V, Cykowska B, Bednarek-Ochyra H, Ochyra R, Dulin M V, Erzberger P, Garcia C, Sérgio C, Claro D, Stow S, Hedderson T A, Hodgetts N G, Hugonnot V, Kucera J, Lara F, Pertierra L, Lebouvier M, Liepina L, Mazooji A, Natcheva R, Phephu N, Philippov D A, Pócs T, Porley R D, Sabovljevic M, Salimpour F, Berhroozmand Motlagh M, Sharifnia F, Akhoondi Darzikolaei S, Schäfer-Verwimp A, Segota V, Shaw A J, Sim-Sim M, Sollman P, Spitale D, Hölzer A, Stebel A, van Rooy J, . (2012). New national and regional bryophyte records, 32
. J. Bryol., 34(3), 231–246.
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Ellis L T; Bednarek-Ochyra H; Cykowska B; Ochyra R; Garcia C; Sérgio C; Lebouvier M; Manolaki P; Giannouris E; Kadis C; Marková I; Papp B; Szurdoki E; Peralta D F; Pláek V; Ristow R; Sabovljevi M; Sim-Sim M; Smith V R; Tsakiri E; Váa J; Virchenko V M; Barsukov O O, . (2012). New national and regional bryophyte records, 30
. Journal of Bryology, 34(1), 45–51(7).
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L. Edel, C. Claud, C. Genthon, C. Palerme, N. Wood, T. L’Ecuyer, D. Bromwich. (2020). Arctic Snowfall from CloudSat Observations and Reanalyses (Vol. 33). Bachelor's thesis, , .
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Ivo G. S. van Hooijdonk, Herman J. H. Clercx, Carsten Abraham, Amber M. Holdsworth, Adam H. Monahan, Etienne Vignon, Arnold F. Moene, Peter Baas, Bas J. H. van de Wiel. (2017). Near-Surface Temperature Inversion Growth Rate during the Onset of the Stable Boundary Layer (Vol. 74). Bachelor's thesis, , .
Abstract: Abstract This study aims to find the typical growth rate of the temperature inversion during the onset of the stable boundary layer around sunset. The sunset transition is a very challenging period for numerical weather prediction, since neither accepted theories for the convective boundary layer nor those for the stable boundary layer appear to be applicable. To gain more insight in this period, a systematic investigation of the temperature inversion growth rate is conducted. A statistical procedure is used to analyze almost 16 years of observations from the Cabauw observational tower, supported by observations from two additional sites (Dome C and Karlsruhe). The results show that, on average, the growth rate of the temperature inversion (normalized by the maximum inversion during the night) weakly declines with increasing wind speed. The observed growth rate is quantitatively consistent among the sites, and it appears insensitive to various other parameters. The results were also insensitive to the afternoon decay rate of the net radiation except when this decay rate was very weak. These observations are compared to numerical solutions of three models with increasing complexity: a bulk model, an idealized single-column model (SCM), and an operational-level SCM. It appears only the latter could reproduce qualitative features of the observations using a first-order closure. Moreover, replacing this closure with a prognostic TKE scheme substantially improved the quantitative performance. This suggests that idealized models assuming instantaneous equilibrium flux-profile relations may not aid in understanding this period, since history effects may qualitatively affect the dynamics.
Programme: 1013,1176
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