oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 747 matches for " patagonia "
All listed articles are free for downloading (OA Articles)
Page 1 /747
Display every page Item
Remote Sensing Study of Glacial Change in the Northern Patagonian Icefield  [PDF]
Lucy Dixon, Shrinidhi Ambinakudige
Advances in Remote Sensing (ARS) , 2015, DOI: 10.4236/ars.2015.44022
Abstract: The Patagonian Icefield has the largest temperate ice mass in the southern hemisphere. Using remote sensing techniques, this study analyzed multi-decadal glacial retreat and expansion of glacier lakes in Northern Patagonia. Glacial boundaries and glacier lake boundaries for 1979, 1985, 2000, and 2013 were delineated from Chilean topographic maps and Landsat satellite images. Aster stereo images were used to measure mass balance from 2007 to 2012. The highest retreat was observed in San Quintin glacier. The area of glacier lakes increased from 13.49 km2 in 1979 to 65.06 km2 in 2013. Four new glacier lakes formed between 1979 and 2013. Between 2007 and 2012, significant glacial thinning was observed in major glaciers, including HPN1, Pared Norte, Strindberg, Acodado, Nef, San Quintin, Colonia, HPN4, and Benito glaciers. Generally, ablation zones lost more mass than accumulation zones.
Modeling Near-Surface Air Temperature and Precipitation Using WRF with 5-km Resolution in the Northern Patagonia Icefield: A Pilot Simulation  [PDF]
Claudia Villarroel, Jorge F. Carrasco, Gino Casassa, Mark Falvey
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.48113
Abstract:

The regional Weather and Research Forecast (WRF) Model was run for the 2000-2010 period over the Northern Patagonia Icefield (NPI) with an horizontal resolution of 5 km. The regional model was initialized using the NCEP/NCAR atmospheric Reanalysis database. The simulation results, centered over the NPI, were validated against the observed data from the local surface stations in order to evaluate the improvement of the model results due to its increased horizontal resolution with respect to the lower resolution from Global Climate Model simulations. Interest in the NPI is due to 1) the large body of frozen water exposed to the impact of the warming planet, 2) the scarce availability of observed meteorological and glaciological information in this large and remote icefield, and 3) the need to validate the model behavior in simulating the current climate and its variability in complex terrain. The results will shed light on the degree of confidence in simulating future climate scenarios in the region and also in similar geographical settings. Based on this study subsequent model runs will allow to model future climate changes in Patagonia, which is basic information for estimating glacier variations to be expected during this century.

LA FRUSTRADA MISIóN ESTRATéGICA DE NAHUELHUAPI, UN PUNTO EN LA INMENSIDAD DE LA PATAGONIA THE FRUSTRATED STRATEGIC MISSION OF NAHUELHUAPI, A POINT IN PATAGONIA′S′ IMMENSITY
M. XIMENA URBINA
Magallania , 2008,
Abstract: En la vertiente oriental de los Andes, en los márgenes del lago Nahuelhuapi, los jesuitas del Colegio de Castro de Chiloé intentaron fallidamente durante los siglos XVII y XVIII mantener una misión y reducción indígena con el objetivo no sólo de la conversión de puelches y poyas, sino de establecer allí una puerta de entrada o base de operaciones para incursiones misionales y exploratorias en la Patagonia hasta el estrecho de Magallanes. Comparecieron en este esfuerzo el celo del evangelizador, pero también los intereses estratégicos hacia esas tierras allende los Andes de las autoridades de la provincia de Chiloé y del Reino de Chile. In the oriental slope of the Andes, in the margins of the Nahuelhuapi Lake, the Jesuits of the Colegio de Castro of Chiloe, unsuccessfully tried during the XVII and XVIII centuries to maintain a native mission and settlement with not only the objective to convert puelches and poyas, but also to establish there a point of access or an operational base to missional and exploratory journeys between the Patagonia and the Strait of Magellan. The devotion of the evangelist appeared in this endeavor, but also the strategic interests towards these lands beyond the Andes, from the authorities from the Chiloe province and the central kingdom of Chile.
EL SUJETO QUE TIEMBLA-DESEA: AMBIVALENCIA, ESTEREOTIPO Y TENSIóN EN LAS REPRESENTACIONES COLONIALES EN LA PATAGONIA
Gabriela álvarez Gamboa
Universum : Revista de Humanidades y Ciencias Sociales , 2010,
Abstract: La Patagonia es una zona de límites desbordados, antecedente que significó un inventario de imágenes enmarcadas por las distintas instancias en que se intentó explorarla y que, impulsan los signos que condicionan un espacio cultural diferenciado. Por tal motivo, debatir el concepto de identidad implica una problemática aún más compleja: qué entender por identidad en el sur? Qué sujetos forman parte de este proyecto identitario? y sobre qué tensiones establecieron sus bases? Para recomponer el proceso de construcción identitaria, es preciso recurrir a los textos que desde la conquista proyectan un imaginario particular del espacio geográfico y de los sujetos que la habitan. El presente trabajo retendrá de las formas discursivas coloniales, una lectura de los tópicos en torno a la identidad magallánica-patagónica como también, los momentos de tensión intertextual que a partir del siglo XVI dispara una manera de posicionar el sur. Patagonia is a region of irregular limits, a fact that signified an inventory of images framed by the various instances of attempted exploration, and that create the conditions for a differentiated cultural space. Therefore, discussing the concept of identity involves a problem even more complex: what is understood by identity in the South?; what subjects are part of this identification project?; and, under what pressures were their bases established? To rebuild the process of identity construction, it is accurate to turn to the texts that from the time of the conquest project a particular image of the geographical area and those who live there. This paper will retain forms of colonial discourse, a reading of the topics concerning the Magellan-Patagonian identity, and moments of intertextual tension that as of the sixteenth century creates a way to position the south.
Eriocóccidos (Hemiptera: Coccoidea) encontrados en la Patagonia Argentina Eriococcidae (Hemiptera: Coccoidea) found in Patagonia Argentina
Patricia González
Revista de la Sociedad Entomol?3gica Argentina , 2004,
Abstract: Se listan cuatro géneros y nueve especies de eriocóccidos presentes en la Patagonia argentina, sobre distintos huéspedes. Chilecoccus browni Miller & González, Chilecoccus spinossus Miller & González, Eriococcus novarinoensis Hoy, Eriococcus rhadinothrix Miller & González, Icelococcus nothofagi Miller & González, sobre Nothofagus dombeyi (Fagaceae). Eriococcus chilensis Miller & González, Eriococcus eurythrix Miller & González, Icelococcus charlini Miller & González, sobre Nothofagus antarctica. Eriococcus eurythrix Miller & González sobre Nothofagus alpina. Icelococcus charlini Miller & González sobre Nothofagus obliqua. Stibococcus cerinus Miller & González sobre Myrceugenia exsucca (Myrtaceae). We list four genera and nine species of eriococcid present in the Patagonia Argentina, on different hosts. Chilecoccus browni Miller & González, Chilecoccus spinossus Miller & González, Eriococcus novarinoensis Hoy, Eriococcus rhadinothrix Miller & González, Icelococcus nothofagi Miller & González, on Nothofagus dombeyi (Fagaceae). Eriococcus chilensis Miller & González, Eriococcus eurythrix Miller & González, Icelococcus charlini Miller & González, on Nothofagus antarctica. Eriococcus eurythrix Miller & González on Nothofagus alpina. Icelococcus charlini Miller & González on Nothofagus obliqua. Stibococcus cerinus Miller & González on Myrceugenia exsucca (Myrtaceae).
Estado del conocimiento taxonómico de la fauna de Chironomidae (Diptera: Nematocera) de la Patagonia Current state of the taxonomic knowledge of the Chironomidae fauna (Diptera: Nematocera) from Patagonia
Mariano Donato,Julieta Massaferro,Stephen J. Brooks
Revista de la Sociedad Entomol?3gica Argentina , 2009,
Abstract: La familia Chironomidae (Diptera: Nematocera) es uno de los grupos de insectos más ampliamente distribuidos y abundantes en cuerpos de agua dulce. Los representantes de esta familia pueden explotar áreas con amplios gradientes ambientales. La información que se presenta está basada en la recopilación de datos distribucionales bibliográficos, del estudio del material tipo de las especies de Chironomidae depositadas en el Natural History Museum (UK) y del material de colección del Museo de La Plata (Argentina). En la Patagonia, se registran 9 subfamilias, la subfamilia monotípica Chilenomyiinae es endémica de esta área. Dentro de estas subfamilias, 53 de los 111 géneros conocidos para América del Sur están presentes en la Patagonia. Del total de géneros de la Patagonia, el 20 % es endémico y 7 de ellos muestran relaciones transantárticas. En la Patagonia, se registran 177 especies de Chironomidae, el 98% de éstas son endémicas, el 3 % son consideradas nomina dubia y el 17% requiere revisión ya que su ubicación sistemática es dudosa. Las descripciones originales de las especies patagónicas de Chironomidae están basadas principalmente sobre machos (n=58) y machos y hembras (n=43), ambas representan el 57% del total; el resto de las especies han sido descriptas con diferentes combinaciones de estadios del ciclo de desarrollo. The Chironomidae (Diptera: Nematocera) family is one of the most widely distributed group of insects and often the most abundant in freshwater environments. Representatives of this family can exploit a wide range of environmental gradients. The information here presented is based on the compilation of distributional data obtained from bibliography, the study of the type material deposited in the Natural History Museum (UK) and the collection material from Museo de La Plata (Argentina). Nine subfamilies are recorded from Patagonia, being the monotypic subfamily Chilenomyiinae endemic for the area. From the 111 known genera from South America, 53 are present in the studied area. Aproximately 20 % of the genera recorded from Patagonia are endemic and 7 of them have transantarctic relationships. In Patagonia there are 177 species of Chironomidae, out of which 98% are endemic, 3 % are considered nomina dubia and ca. 17 % requires revision since their systematic position is doubtful. The original descriptions of the chironomid species from Patagonia are based mainly on males (n=58) and males and females (n=43) both amounting to 57 % of the total, the rest of the species have been described using different combinations of stages from their lif
Estado de conocimiento del orden Plecoptera en la Patagonia Current knowledge of Patagonian Plecoptera
Pablo Pessacq
Revista de la Sociedad Entomol?3gica Argentina , 2009,
Abstract: El conocimiento de Plecoptera en la Patagonia se debe en gran parte a la labor de J. Illies, llevada a cabo en las décadas del 50 y 60 del siglo pasado. Se suman a esta labor contribuciones intermitentes, previas y posteriores, que han logrado un adecuado conocimiento del grupo en la cordillera norte y central de la Patagonia, en mucho menor grado en la zona austral de esta región (provincias de Santa Cruz y Tierra del Fuego) y las áreas de estepa. Se incluyen nuevos registros para la Argentina y se presenta una lista de las 83 especies y 37 géneros de plecópteros patagónicos. De estos últimos, se conocen para la Argentina 47 especies reunidas en 28 géneros. The current knowledge of the Patagonian Plecoptera is due to the work by J. Illies during last Century's 50`s and 60`s , as well as to intermitent previous and posterior contributions. This knowledge is reasonable for the northern and central Patagonian Andes, and poor for the southernmost mountain areas (Santa Cruz and Tierra del Fuego provinces) and the steppe. New records are provided from Argentina. A list of the 83 species and 37 genera of Patagonian Plecoptera is given, out of which 47 species belonging to 28 genera are known to occur in Argentina.
Estado actual del conocimiento del orden Odonata en la Patagonia Current knowledge of Patagonian Odonata
Javier Muzón
Revista de la Sociedad Entomol?3gica Argentina , 2009,
Abstract: El orden Odonata se encuentra representado en la Patagonia por 36 especies, reunidas en nueve familias y 18 géneros. El nivel de endemismo de esta taxocoenosis es alto, aproximadamente el 60% de las especies y casi el 40% de los géneros endémicos. La riqueza específica en la Patagonia decrece de Oeste a Este y de Norte a Sur, las áreas de mayor riqueza resultan ser las cordilleras de Nahuel Buta (Chile) y de los Andes entre 38° y 41° S, y la meseta de Somuncurá (Argentina) en la estepa. Se brinda una actualización del estado de conocimiento y un análisis de los principales patrones de distribución. The Odonata order is represented in Patagonia by 36 species belonging to nine families and 18 genera. The endemicity level is high being approximately 60% of the species and 40% of genera endemic. The specific richness in Patagonia decreases from West to East and from North to South, being Nahuel Buta (Chile) and Andes mountains between 38° and 41° S on the forest area, and the Somuncurá plateau (Argentina) on the steppe the richest areas. An update of its records and an analysis of the main distribution patterns are provided in this paper.
Estado de conocimiento del orden Ephemeroptera en la Patagonia Current knowledge of Patagonian Ephemeroptera
Pablo Pessacq
Revista de la Sociedad Entomol?3gica Argentina , 2009,
Abstract: El conocimiento actual del orden Ephemeroptera en la Patagonia se debe en gran parte a la labor original y compilatoria de M.L. Pescador, W.L. Peters y E. Domínguez, llevada a cabo en la década del 80 del siglo pasado. Se suman a ésta, importantes contribuciones que han conducido a un adecuado conocimiento del grupo en la cordillera norte y centro de la Patagonia, aunque menor en la zona austral de esta región (Santa Cruz y Tierra del Fuego) y las áreas de estepa. Merced al trabajo de campo realizado en 80 sitios de muestreo relevados en el marco del "Darwin Initiative Project" en el Parque Nacional Nahuel Huapi, se incluyen aquí nuevos registros para la Argentina (Hapsiphlebia anastomosis Demoulin), la región Andina (Apobaetis Day) y la provincia de Río Negro (Chaquihua bullocki (Navás), Andesiops ardua (Lugo-Ortíz & McCafferty), Murphyella needhami Lestage y Dactylophlebia carnulenta Pescador & Peters). Con estos registros, la riqueza de Ephemeroptera de la Patagonia alcanza 43 especies y 24 géneros, de las cuales 33 (en 20 géneros) se conocen para la Argentina. The current knowledge of the Patagonian Ephemeroptera is due to the original and compiling work by M.L. Pescador, W.L. Peters and E. Domínguez during last Century's 80′s . Besides, other previous publications exist that contributed to achieve a reasonable knowledge of its taxonomy for the norhtern and central Patagonian Andes, though poor for the southernmost mountain areas (Santa Cruz and Tierra del Fuego provinces) and the steppe. From the field work carried in 80 collecting sites during the development of the "Darwin Initiative Project" in the Nahuel Huapi Nacional Park, some species are recorded for the first time in Argentina (Hapsiphlebia anastomosis Demoulin), the Andean region (Apobaetis Day) and the province of Río Negro (Chaquihua bullock (Navás), Andesiops ardua (Lugo-Ortíz & McCafferty), Murphyella needhami Lestage, Dactylophlebia carnulenta Pescador & Peters). With these records, 43 species and 24 genera of Patagonian Ephemeroptera inhabit Patagonia, out of which 33 species belonging to 20 genera are known to occur in Argentina.
Dieta estacional del ciervo colorado (Cervus elaphus) en el Parque Nacional Nahuel Huapi, Argentina
Ortiz,Claudia; Bonino,Never A;
Ecolog?-a austral , 2007,
Abstract: the botanical composition and seasonal variation on the diet of the red deer (cervus elaphus) in the nahuel huapi national park was determined. fecal fresh samples from at least 15 individuals were collected at every season which were analyzed individually using the microhistological analysis. in autumn and winter, ligneous species (l. hirsuta among the trees and collettia spinosissima among the shrubs) were the most consumed plants, while in spring and summer the grasses and graminoids (poa spp. and carex spp., respectively) were the main basis of the diet. the red deer showed to be an intermediate feeder as its diet was a mixture of grasses (15%), graminoids (22%) and concentrated foods (62%). the great consumption of l. hirsuta suggested that red deer browsing could affect the regeneration of this tree species, specially in areas with high deer densities.
Page 1 /747
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.