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Delille D. (1993). Seasonal changes in the abundance and composition of marine heterotrophic bacterial communities in an Antarctic coastal area. Polar Biol., 13, 463–470.
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Maupin V. (1992). Modelling of laterally trapped surface waves with application to Raleigh waves in the Hawai'ian swell. Geophysical journal international, 110, 553–570.
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Delille D., Cahet G., Dessommes A. & Rosiers C. (1993). Rapport sur l'étude menée de Janvier 91 à novembre 93 en Terre Adélie..
Abstract: Rapport ELF
Programme: 193
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Raynaud D. & Siegenthaler U. (1993). Role of Trace Gases:The Problem of Lead and Lag. (Vol. 12).
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Weimerskirch H., Stahl J.C. & Jouventin P. (1992). The breeding biology and population dynamics of King Penguins Aptenodytes patagonica on the Crozet Islands. Ibis (Lond. 1859), 134, 107–117.
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Bachok Zainudin, Meziane Tarik, Mfilinge Prosper L, Tsuchiya Makoto, . (2009). Fatty acid markers as an indicator for temporal changes in food sources of the bivalve Quidnipagus palatum
. Aquatic Ecosystem Health & Management, 12(4), 390–400.
Abstract: Changes in the fatty acid composition in the tissues of the bivalve Quidnipagus palatum from the Tomigusuku intertidal flat, Okinawa, Japan, collected in four different seasons (November 2000, the beginning of cold season; January 2001, the cold season; May 2001, the rainy season; and July 2001, the warm season) were examined and compared to the composition of surface sediments and suspended particulate materials. Assessment of fatty acid markers suggested that the food sources of Q. palatum differed between seasons and depended on the sources of organic material present in the sediment and water column. Vascular plants and bacteria were the main dietary components from July to November because of their abundance in the sediment. From November to January, macroalgae and phytoplankton were the major food sources of Q. palatum, corresponding to their predominance in sediments and algal blooms, respectively. During the May rainy season, organic matter in the sediment was dominated by diatoms, whereas the water column contained diatoms and resuspended macroalgal detritus. The transition to the warm season by July significantly increased the contribution of diatoms to the organic matter present in both the sediment and the water column. Consequently, from May to July, diatoms became the main food source for Q. palatum.
Programme: 1090
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Thébault Julien, Schöne Bernd R, Hallmann Nadine, Barth Matthias, Nunn Elizabeth V, . (2009). Investigation of Li/Ca variations in aragonitic shells of the ocean quahog Arctica islandica, northeast Iceland
. 1525-2027, 10(12), Q12008–.
Abstract: Interannual and intra-annual variations in lithium-to-calcium ratio were investigated with high temporal resolution in the aragonitic outer shell layer of juvenile Arctica islandica (Mollusca; Bivalvia) collected alive in 2006 off northeast Iceland. Li/Cashell ranged between 7.00 and 11.12 mol mol1 and presented well-marked seasonal cycles with minimum values recorded at the annual growth lines; a general pattern was a progressive increase in Li/Cashell from March to May, followed by a plateau in June and a decrease down to minimum values in JulyAugust. Li/Cashell was correlated with 18Oshell-derived temperature, but the strength of this relationship was weak (r2 < 0.25 and p < 0.05). It covaried significantly with microgrowth increment width and with the discharge from one of the closest rivers. Seasonal variations of Li/Cashell in A. islandica may most likely be explained (1) by calcification rate and/or (2) by significant river inputs of Li-rich silicate particles flowing to the sea as soon as snow melts. In the first case, Li/Cashell may be a useful proxy for addressing seasonal variations of growth rate in bivalves that lack discernable microgrowth patterns. Abrupt decreases of Li/Cashell may, in turn, help identify growth retardations due to harsh environmental conditions. Alternatively, if Li/Cashell variations are linked to particulate Li inputs by rivers, this could be a new proxy for the intensity of mechanical weathering of Icelandic basalts, with interesting perspectives for the reconstruction of frequency and intensity of past jökulhlaups (subglacial outburst floods). Further works, including experimental studies, are needed to test these hypotheses.
Keywords: bivalve, lithium, calcification, shell growth rate, weathering, Iceland, 0424 Biosignatures and proxies, 0438 Diel, seasonal, and annual cycles, 0454 Isotopic composition and chemistry,
Programme: 1090
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Comte D., Pardo M., Dorbath L., Dorbath C., Haessler H., Rivera L., Cisternas A. & Ponce L. (1994). Determination of seimogenic interplate contact zone and crustal seimicity around Autofagasta, northern Chile using local data. Geophysical journal international, 116, 553–561.
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Thébault Julien, Chauvaud Laurent, L'Helguen Stéphane’, Clavier Jacques, Barats Aurélie, Jacquet Séverine, Pécheyran Christophe, Amouroux David, . (2009). Barium and molybdenum records in bivalve shells: Geochemical proxies for phytoplankton dynamics in coastal environments?
. Limnol. Oceanogr., 54(3), 1002–1014.
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Pettré Paul, Payan Christophe, Parish Thomas R, . (1993). Interaction of Katabatic Flow With Local Thermal Effects in a Coastal Region of Adelie Land, East Antarctica
. J. Geophys. Res., 98(D6), 10429–10440.
Abstract: Katabatic flows largely dominate the climate of the Adelie Land coastal region. A detailed climatological data analysis of Dumont d'Urville has been conducted. Results of this study support the idea that katabatic flow can be locally enhanced by the diurnal cycle of solar insolation and the temperature contrast between the continent and the ocean. The interaction between katabatic wind and local thermal effects is expressed in terms of scale analysis. Except for surface stress, all terms in the momentum equation for a katabatic flow in a coastal region of Antarctica can reach the same order of magnitude. The local circulation then is the result of a relatively tenuous force balance which can be disrupted even by a weak perturbation of any term. To estimate the effect of the temperature contrast between the ocean and the continent on the katabatic flow, two numerical experiments have been conducted. The simulations consider an ocean free of sea ice representative of the summer months, and another winter case with the ocean covered by thick sea ice. These simulations show that with the ocean free of sea ice, the katabatic flows extend only a limited distance over the open ocean during the day due to the local thermal effects. With the ocean covered by sea ice, the katabatic winds are not constrained and extend a considerable distance offshore.
Programme: 211
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