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Åkesson S.; Weimerskirch H. (2005). Albatross long-distance navigation: comparing adults and juveniles. Journal of navigation, 58(3), 365–373.
Abstract: Albatrosses are known for their extreme navigation performance enabling them to locate isolated breeding islands after long-distance migrations across open seas. Little is known about the migration of young albatrosses and how they reach the adults' navigation and foraging skills during the period of immaturity lasting several years and spent permanently flying across the open ocean. We tracked by satellite telemetry the dispersal and migration of 13 juvenile wandering albatrosses from the Crozet Islands during their first year at sea. The young albatrosses covered an average distance of 184,000 km during the first year, restricting their dispersal movement to the unproductive and low wind subtropical Indian Ocean and Tasman Sea. The juveniles initiated the migration by an innate phase of rapid dispersal encoded as a fixed flight direction assisted by southerly winds towards north and northeast. Thereafter each individual restricted its movement to a particular zone of the ocean that will possibly be used until they start breeding 7–10 years later and return in contact with breeding adults. This dispersal in young birds corresponds well with movements observed for adult non-breeding wandering albatrosses. The results show clearly an inherited ability to navigate back to already visited areas in young wandering albatrosses. The juvenile dispersal behaviour and migration at sea suggest a genetically based migration program, encoding navigation to a destination area used throughout the life.
Programme: 109
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Van Petegem, F.,; Collins, T.,; Meuwis, M.-A.,; Gerday, C.,; Feller, G.,; Van Beeumen, J.,. (2002). Crystallization and preliminary X-ray analysis of a xylanase from the psychrophile Pseudoalteromonas haloplanktis. Acta Crystallogr. D Biol. Crystallogr., 58(9), 1494–1496.
Abstract: The 46 kDa xylanase from the Antarctic microorganism Pseudoalteromonas haloplanktis is an enzyme that efficiently catalyzes reactions at low temperatures. Here, the crystallization of both the native protein and the SeMet-substituted enzyme and data collection from both crystals using synchrotron radiation are described. The native data showed that the crystals diffract to 1.3 A resolution and belong to space group P212121, with unit-cell parameters a = 50.87, b = 90.51, c = 97.23 A. SAD data collected at the peak of the selenium absorption edge proved to be sufficient to determine the heavy-atom configuration and to obtain electron density of good quality.
Keywords: psychrophiles; cold-adapted enzyme; glycosyl hydrolases
Programme: 193
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Peri A., Barbarito M. & Ruffini M.C. (2002). L'adattamento psicosociale nelle spedizioni antartiche: studio degli indicatori comportamentali[Psychosocial adjustment in the Italian Antarctic expeditions: research on behavioral indicators]. Il polo, 57.
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Siegenthaler U., Monnin E., Kawamura K., Spahni R., Schwander J., Stauffer B., Stocker T., Barnola J.M. & Fischer H. (2005). Supporting evidence from the EPICA dronning maud Land ice core for atmospheric CO² changes during the past millenium. Tellus series a-dynamic meteorology and oceanography, B-57, 51–57.
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Lefebvre E., Augustin L. & Maitre M. (2002). the EPICA borehole logger. Mem. national inst. polar res. spec. issue, 56, 264–274.
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Guinet C. (1992). Croissance des éléphants de mer de l'archipel Crozet (46°25'S, 51°45'E) pendant leur première année de vie. Mammalia, 56(3), 459–468.
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Augustin L. & Antonelli A. (2002). the EPICA deep drilling program. Mem. national inst. polar res. spec. issue, 56, 226–244.
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Drüflcker C., Wilhelms F., Oerter H., Frenzel A., Gernandt H. & Miller H. (2002). Design, transport, construction, and operation of the summer base Kohnen for ice-core drilling in Dronning Maud Land, Antarctica. Mem. national inst. polar res. spec. issue, 56.
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Peri A., Barattoni M. & Barbariti M. (2001). Valutazione retrospettiva dell'esperienza psico-socio-organizzativa di una campagna antartica [Retrospective analysis of psycho-socio-organizational Antarctic experience] . Il polo, 56.
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Weiss, K., Moser, G., & Germann, C. (2006). Perception de l'environnement, conceptions du métier et pratiques culturales des agriculteurs dans le cadre du développement durable. Revue européenne de psychologie appliquée, 56, 73–81.
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