Goguitchaichvili A.,National Autonomous University of Mexico |
Morales J.,National Autonomous University of Mexico |
Loponte D.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano
Studia Geophysica et Geodaetica | Year: 2017
Laguna Melincué is a shallow lake located in Santa Fe Province, Argentina (33°41′27.8″S, 61°31′36.5″W). The catchment area is around 1495 km2 and it is located in the Pampean Plains. It was reduced to 678 km2 by the construction of the San Urbano channel in 1941 and reconditioned in 1977, which was built to avoid floods. The floods are related to some El Niño episodes, with high precipitation events. The lake has been previously studied from different approaches, mainly to understand hydrological and climatic variations, but more multidisciplinary studies are needed to understand its complex hydrological situation. Here we present the first paleomagnetic and rock magnetic studies made on a short sediment core collected from the lake in order to contribute to identifying paleoclimatic proxies and to present the first paleomagnetic results for the site. Rock magnetic analyses suggest that the well-preserved magnetic mineralogy is dominated by pseudo single-domain (titano)magnetite and/or maghemite. The results also indicate that a stable characteristic remanent magnetisation can be isolated and thus the directions of the geomagnetic field may be obtained, providing evidence for the use of this lake for paleomagnetic and paleoenvironmental studies. Changes in magnetic grain size and concentration of magnetic minerals suggest environmental variations and changes in the lake level, which are consistent with historical reports. The paleomagnetic results agree well with Cals3k.3 model for inclination and declination of the geomagnetic field except for the dry period probably due to the fact that the core was extracted near the shore. © 2017 Institute of Geophysics of the ASCR, v.v.i
Guerreiro C.,Institute Botanica Darwinion |
De Agrasar Z.E.R.,Institute Botanica Darwinion |
Fernanda Rodriguez M.,Institute Botanica Darwinion |
Fernanda Rodriguez M.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano
Journal of the Torrey Botanical Society | Year: 2013
Chusquea Kunth and Rhipidocladum McClure species (Poaceae, Bambusoideae, Bambuseae) are the only two genera of woody bamboos whose distributions reach the southernmost portion of the Andes mountain range. The identification of woody bamboos relies mainly on vegetative characters. In the present work, foliage leaf blade anatomy of Andean woody bamboo species occurring in Argentina and neighboring areas is described. Eight species are surveyed: Chusquea culeou E. Desv., C. deficiens Parodi, C. lorentziana Griseb., C. montana Phil., C. quila Kunth, C. valdiviensis Phil., Rhipidocladum neumannii Sulekic, Rúgolo & L. G. Clark and R. racemiflorum (Steud.) McClure. Leaf blade abaxial epidermal and cross section characters of each species are described and an identification key based on anatomical characters is provided. Anatomical evidence that support the idea of C. quila and C. valdiviensis as different species is presented and information on useful characters to distinguish between them is provided. Also, taxonomic position of R. neumannii is determined based on anatomical features. Finally, the taxa studied are compared in tables based on leaf anatomical characters of taxonomic value. © Torrey Botanical Club.
Guerreiro C.,Institute Botanica Darwinion |
Rodriguez M.F.,Institute Botanica Darwinion |
Rodriguez M.F.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano |
de Agrasar Z.E.R.,Institute Botanica Darwinion
Kew Bulletin | Year: 2013
Summary: Six genera of woody bamboos (Poaceae, Bambusoideae, Bambuseae) occur along the Andes, but only two reach the southernmost portion of this mountain range, Chusquea Kunth and Rhipidocladum McClure. In woody bamboos, the identification of new anatomical characters bears a considerable taxonomic significance contributing to the determination of vegetative material. In the present work, culm anatomy of Andean woody bamboo species occurring in Argentina and neighbouring areas is described. Eight species are surveyed: C. culeou E. Desv., C. deficiens Parodi, C. lorentziana Griseb., C. montana Phil., C. quila Kunth, C. valdiviensis Phil., R. neumannii Sulekic, Rúgolo & L. G. Clark and R. racemiflorum (Steud.) McClure. Culm epidermal and cross sectional characters of each species are described and an identification key based on anatomical characters is provided. Culm anatomical characters of C. montana, C. quila and C. valdiviensis are presented for the first time. Also, anatomical evidence that support the idea of C. quila and C. valdiviensis as different species is presented and information on useful characters to distinguish between them is provided. The taxa studied are compared in tables based on culm anatomical characters of taxonomic value. © 2013 The Board of Trustees of the Royal Botanic Gardens, Kew.
Ciarlo N.C.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano |
De Rosa H.,Laboratorio Of Materiales |
Elkin D.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano |
Svoboda H.,University of Buenos Aires |
And 3 more authors.
Historical Metallurgy | Year: 2011
The results of morphological and microstructural examination of an anchor found near the site of the shipwreck (1770) of the British sloop-of-war HMS Swift during the enlargement of Puerto Deseado pier are presented. The following analyses were performed: Microstructural characterization, determination of chemical composition, and microhardness testing. Some aspects of the manufacturing process and the material used were determined. The characteristics of the anchor are consistent with those of 18th-century English anchors. According to these results, the anchor's possible link with the wreck of the Swift is examined.
Tchilinguirian P.,CONICET |
Tchilinguirian P.,University of Buenos Aires |
Morales M.R.,CONICET |
Morales M.R.,University of Buenos Aires |
And 8 more authors.
Quaternary International | Year: 2014
This paper presents a multi-proxy record and its paleoenvironmental interpretation from Pastos Chicos (23° 40' 29″ S; 66° 25' 32″ W; 3781masl), Susques, Jujuy province, Argentina. The analysis includes a study of fluvial sediments and geomorphology, and the contained diatoms and pollen record at centenary resolution. Two main environmental phases characterize the ~9000-4200BP interval. The first phase was a humid period between ~9000 and 7300BP (circa 10,000-8100cal.BP) which showed organic soils formation in a floodplain broadly vegetated by grasses with a high and stable water table level. The second phase developed between 7300 and 6000BP (~8100-6800cal.BP) and showed a moderately drier environment interrupted by punctuated humid events such as those around 7000 and 6300BP. This environment could be interpreted as a permanently existing meandering river with a floodplain with shallow oxbow lakes, bordered by a diverse shrub steppe. After 6000BP, the fluvial system turned into a braided river situated in a sandy floodplain with dunes and ephemeral ponds. At the end of the sequence (i.e. post ~4200BP), salt crusts developed and the river lowered its base level by 8m. These results seem to show that the Pastos Chicos river basin evolved from low energy and more humid conditions established during the Early and the first part of the Middle Holocene, to drier ones in a system with more energy during some events of the second part of the latter period. The start of this aridization process at ~6000BP in the basin, seems to be substantially later than other observations in local records of the Andean area. This could be due to physiographic control of the moisture by the catchment area (~1000km2) that generates a catchment-averaged regional scale signal of smaller amplitude, which is delayed for individual tributaries. These studies, with other ongoing analysis, will improve the accuracy of the models of resource structure in the area in several space-time scales and, consequently, advance knowledge concerning the organizational pattern of human societies in the past. © 2012 Elsevier Ltd and INQUA.
Madanes N.,University of Buenos Aires |
Quintana R.D.,University of Buenos Aires |
Quintana R.D.,CONICET |
Biondini M.,University of Buenos Aires |
And 2 more authors.
Revista Chilena de Historia Natural | Year: 2010
In the present study we assess the contribution of C3, C 4 and intermediate C3-C4 plant species to the diet of both native (Hydrochoerus hydrochaeris, Rhea americana and Logostomus maximus) and introduced (cattle) herbivore species and the abundance of these photosynthetic plant types in different environments of the lower section of the Paraná Basin, Argentina, with similar climate but different hydrological regimes. Data of current plants species and their photosynthetic pathways, both form vegetation and the diet, were compiled from literature. The analysis of annual diets conducted in terms of photosynthetic types showed that the feeding patterns of native as well introduced herbivores varied both spatially and temporally. At each site, the analysis of vegetation and the diet of herbivores in spring indicated that the feeding patterns may depend not only on vegetation availability, but also on the preferences of herbivores and inter-specific interactions under limited resource conditions. These attributes should be taken into account when interpreting the diet of fossil herbivores from isotopic carbon information. Also, the studies on photosynthetic groups enhance our understanding of the relationship between paleodiets and paleoenvironments. © Sociedad de Biología de Chile.
Sardella N.H.,University of the Sea |
Sardella N.H.,CONICET |
Fugassa M.H.,University of the Sea |
Fugassa M.H.,CONICET |
And 4 more authors.
Memorias do Instituto Oswaldo Cruz | Year: 2010
The aim of this study was to examine the parasite remains present in rodent coprolites collected from the archaeological site Alero Destacamento Guardaparque (ADG) located in the Perito Moreno National Park (Santa Cruz Province, 47°57'S 72°05'W). Forty-eight coprolites were obtained from the layers 7, 6 and 5 of ADG, dated at 6,700 ± 70, 4,900 ± 70 and 3,440 ± 70 years BP, respectively. The faecal samples were processed and examined using paleoparasitological procedures. A total of 582 eggs of parasites were found in 47 coprolites. Samples were positive for eggs of Trichuris sp. (Nematoda: Trichuridae), Calodium sp., Eucoleus sp., Echinocoleus sp. and an unidentified capillariid (Nematoda: Capillariidae) and for eggs of Monoecocestus (Cestoda: Anoplocephalidae). Quantitative differences among layer for both coprolites and parasites were recorded. In this study, the specific filiations of parasites, their zoonotic importance, the rodent identity, on the basis of previous zooarchaeological knowledge, and the environmental conditions during the Holocene in the area are discussed.
Post-harvest processing of quinoa grains (chenopodium quinoa, chenopodiaceae) in late pre-hispanic period at northern lípez (potosi, bolivia) [Procesamiento post-cosecha de granos de quinoa (Chenopodium Quinoa, Chenopodiaceae) en el período prehispánico tardío en el norte de lípez (Potosí, Bolivia)]
Laura Lopez M.,Museo de Ciencias Naturales de La Plata |
Capparelli A.,Museo de Ciencias Naturales de La Plata |
Nielsen A.E.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano
Darwiniana | Year: 2012
On the basis of an ethnoarchaeological study of post-harvest quinoa processing in the Lípez Altiplano (Potosí, Bolivia), some diagnostic traits of each activity and methods of processing dried grains are established. The potential of these observations to investigate the ancient practices of processing and consumption of this pseudocereal is illustrated by analyzing grains recovered from four archaeological sites near Salar de Uyuni. The quinoas examined were at different stages of processing; some showed no traces of saponin extraction, suggesting that they had been stored immediately after harvest, while others exhibited saponification traces comparable to those observed in current contexts, suggesting that they had been prepared for consumption.
Maier M.S.,University of Buenos Aires |
Gomez B.A.,University of Buenos Aires |
Parera S.D.,University of Buenos Aires |
Elkin D.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano |
And 4 more authors.
Journal of Molecular Structure | Year: 2010
Different types of materials found in association with a human skeleton found in an 18th century shipwreck in Patagonia (Argentina) were analyzed by means of OM, SEM-EDX, HPLC, and chemical analysis. Alizarin and purpurin, the main anthraquinones of the dye plant Rubia tinctorum L. (madder) were identified as the coloring matter of a red fabric attached to the skeleton. Metallographic and chemical analysis of one of the dome-shaped buttons associated to the human bones revealed that it was composed of a Pb-Sn-Cu alloy known as pewter. The results obtained support the hypothesis that the remains originally were part of a private marine uniform. © 2010 Elsevier B.V. All rights reserved.
Rodriguez M.F.,Instituto Nacional Of Antropologia Y Pensamiento Latinoamericano
Darwiniana | Year: 2013
This paper integrates archaeobotanical research conducted in Antofagasta de la Sierra based on the identification, anatomy, and use of both present plant resources and archaeological plant remains, recovered during fieldwork between 1994 and 2000. Transects starting from the archaeological sites, the surrounding plant communities, and the species found are described. Characterization of present plant diversity also included the popular name and actual use of every species. Archaeological plant remains were identified by anatomy in comparison with present plant species in the studied area and their anatomical characters are here described and documented with digital images taken with compound microscope (bright field) and scanning electron microscope. Finally, discussion includes past and present use of every species recovered in the archaeological sites from Antofagasta de la Sierra, highlighting those aspects that imply change or continuity through time.