Durante las últimas décadas, drásticas contracciones en la estructura de los hielos marinos y en las poblaciones de la especie clave, krill Antártico (Euphausia superba), han ocurrido junto con severas variaciones climáticas en la región boreal de la península Antártica. Se ha estimado que las po...
In a recent decades drastic contractions in sea ice structure and in populations of key species, Antarctic krill (Euphausia superba), have occurred along with severe changes in the boreal region of the Antarctic Peninsula. It has been estimated that populations of Pygoscelid penguins (genus Pygos...
Given the potential significance of enzyme activities as a link between internal metabolic pathways and environmental nutrients, we investigated the relationships of nitrate reductase (NR) and alkaline phosphatase (AP) with primary production and inorganic nutrients in South Shetland Islands, Ant...
Dada la potencial importancia de la actividad enzimática de ensambles fitoplanctónicos, como indicador de
su metabolismo interno dominante respecto de los nutrientes, este estudio investigó las relaciones entre la
nitrato reductasa (NR) y la fosfatasa alcalina (FA) con la producción primaria y nu...
La parte más austral del cono sur de Sudamérica, que algunas veces se encuentra bajo la influencia del agujero de ozono antártico (AOA), ocasionalmente recibe altos niveles de radiación ultravioleta B (UV-B: 280-320nm). La Universidad de Magallanes en Punta Arenas, Chile (Lat. 53° S; Long. 70.9° ...
The most austral zone of the Southern Cone of South America, wich is sometimes under the influence of the Antarctic Ozone Hole (AOH), occasionally receives enhanced levels of ultraviolet B radiation (UV-B: 280-320 nm). Ultraviolet erythemal irradiance measurements began in 1999 by the University ...
Background: Antarctic marine organisms have evolved a variety of physiological, life-history and molecular
adaptations that allow them to cope with the extreme conditions in one of the coldest and most temperaturestable
marine environments on Earth. The increase in temperature of the Southern Oce...
Antarctica is recognized as being geopolitically and scientifically important, and as one of the regions with the greatest potential to affect and be affected by global climate change. Still, little is known in practice about how climate change will be handled within the main governance framework...
This paper presents an analysis of satellite and groundbased
measurements of total O3 columns and the UV index
of a unique event during the 2009 Antarctic O3 hole season.
From 11 to 30 November 2009 the Antarctic vortex was
located just south of the southern tip of South America
rather than at it...
A fossil invertebrate fauna from the South-West end of Livingston Island, South Shetland Islands, is described. The fauna, found in marine beds interbedded in a plant-bearing continental sequence, consists of Spiticeras (Spiticeras) spitiensis, Blanfordiceras (Pseudoblanfordia) patagoniense, Favr...
Se describe la fauna de invertebrados fósiles, encontrados en el extremo suroeste de Isla Livingston. La fauna está contenida en sedimentos marinos intercalados con estratos continentales con restos de plantas fósiles. Las especies determinadas son: Spiticeras (Spiticeras) spitiensis, Blanfordice...
Con el propósito de aportar antecedentes de la fauna parasitaria gastrointestinal del pingüino Papua (Pygoscelis papua) de la península Munita (64°49'S, 62°51'O), bahía Paraíso, territorio Antártico, se examinaron 1000 muestras de heces obtenidas directamente de la cloaca de estas aves y 18 órgan...
Con el propósito de estudiar la fauna parasitaria del pingüino de Humboldt (Spheniscus humboldti), que habita en las costas de la quinta región del país, se analizaron 100 muestras de deyecciones y se realizaron 30 necropsias de animales muertos por causas desconocidas o naturales. Los resultados...
Forty nine samples, of superficial marine sediments (< 50m.) from 3 localities: Deception Island,
Chile Bay and Fildes Bay, Antarctic península were analysed in order to investigate the foraminiferers
of suborder Textulariina Delage y Herouard, 1886. Twenty two species were identified and classif...
Se analizó un total de 49 muestras de sedimento marino superficial (< 50 m) extraídas en tres
localidades: isla Decepción, bahía Chile y bahía Fildes, península Antártica con el objeto de investigar
los foraminíferos del suborden Textulariina, Delage y Herouard, 1886. Se identificaron 22 especies...
