Age determination of corals from the North Atlantic and the Tasman Sea

During the past 40,000 years, global climate has moved into and out of a full glacial period, with the deglaciation marked by several millennial-scale rapid climate change events. Here we investigate the ecological response of deep-sea coral communities to both glaciation and these rapid climate change events. We find that the deep-sea coral populations of Desmophyllum dianthus in both the North Atlantic and the Tasmanian seamounts expand at times of rapid climate change. However, during the more stable Last Glacial Maximum, the coral population globally retreats to a more restricted depth range. Holocene populations show regional patterns that provide some insight into what causes these dramatic changes in population structure. The most important factors are likely responses to climatically driven changes in productivity, [O2] and [CO3]2-.

Physiography of the Ampère Seamount in the Horseshoe Seamount chain off Gibraltar

The Ampère Seamount, 600 km west of Gibraltar, is one of nine inactive volcanoes along a bent chain, the so called Horseshoe Seamounts. All of them ascend from an abyssal plain of 4000 to 4800 m depth up to a few hundred meters below the sea surface, except two, which nearly reach the surface: the Ampère massif on the southern flank of the group and the summit of the Gorringe bank in the north. The horseshoe, serrated like a crown, opens towards Gibraltar and stands in the way of its outflow. These seamounts are part of the Azores-Gibraltar structure, which marks the boundary between two major tectonic plates: the Eurasian and the African plate. The submarine volcanism which formed the Horseshoe Seamounts belongs to the sea floor spread area of the Mid-Atlantic Ridge. The maximum activity was between 17 and 10 Million years ago and terminated thereafter. The volcanoes consist of basalts and tuffs. Most of their flanks and the abyssal plain around are covered by sediments of micro-organic origin. These sediments, in particular their partial absence on the upper flanks are a circumstantial proof and a kind of diary of the initial rise and subsequent subsidence of about 6oo m of these seamounts. The horizons of erosion where the basalt substrate is laid bare indicate the rise above sea level in the past. Since the Ampère summit is 60 m deep today, this volcano must have been an island 500 m high. The stratification of the sediments covering the surrounding abyssal plain reveals discrete events of downslope suspension flows, called turbidites, separated by tens of thousands of years and perhaps induced by changes in climate conditions. The Ampère sea mount of 4800 m height and a base diameter of 50 km exceeds the size of the Mont Blanc massif. Its southern and eastern flanks are steep with basalts cropping out, in parts with nearly vertical walls of some hundred meters. The west and north sides consist of terraces and plateaus covered with sediments at 140 m, 400 m, 2000 m, and 3500 m. The Horseshoe Seamount area is also remarkable as a kind of disturbed crossing of three major oceanic flow systems at different depths and directions with forced upwelling and partial mixing of the water masses. Most prominent is the Mediterranean Outflow Water (MOW) with its higher temperature and salinity between 900 to 1500 m depth. It enters the horseshoe unimpaired from the open eastern side but penetrates the seamount chain through its valleys on the west, thereafter diverging and crossing the entire Atlantic Ocean. Below the MOW is the North Atlantic Deep Water (NADW) between 2000 m to 3000 m depth flowing southward and finally there is the Antarctic Bottom Water (AABW) flowing northward below the two other systems.

El exilio chileno : Río profundo de la cultura iberoamericana

El exilio chileno dio lugar a un fenómeno cultural de grandes proporciones y el confinamiento, con todas sus secuelas, inspiró un florecimiento extraordinario de las letras y las artes de vastas proyecciones, tanto así que despertó y sigue motivando el interés de estudiosos de diversas disciplinas. Entre los miles de chilenos que se repartieron por el mundo, un grupo, cualitativamente relevante, estuvo constituido por escritores, artistas plásticos, artesanos, músicos, gente de teatro y de cine, hombres de ciencia y académicos de las más variadas disciplinas. Grupos teatrales funcionaron en muchos países; y los conjuntos musicales chilenos recorrieron el mundo. Las exposiciones de pintores, fotógrafos, y escultores chilenos eran frecuentes en las más importantes ciudades americanas y europeas, a la vez que en el marco de casi todas las manifestaciones de solidaridad las artesanías, obras de artistas profesionales y ocasionales, eran puestas a la venta; muchos refugiados lograron sobrevivir del producto de este tipo de trabajo.

De la programación miscelánica a la consolidación de la ópera : Devenir y conformación del gusto musical en Buenos Aires (1821-1828)

El objetivo del presente trabajo reside en analizar el proceso de conformación del gusto musical por el género lírico en la sociedad porteña durante el período 1821-1828. Dicho proceso será abordado mediante la reconstrucción y análisis de la programación musical presente, principalmente, en la prensa del período. Asimismo, se indaga en torno a la dinámica de los espacios musicales inaugurados e impulsados para tal fin -academia, sociedades y teatro- y sobre los principales músicos y cantantes intervinientes en dicho proceso cultural.