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José P. Vega-Camarena, Luis Brito-Castillo, Luis F. Pineda-Martínez and Luis M. Farfán
In the warm season, El Niño/Southern Oscillation (ENSO) causes periods with more rain in Northern Mexico during its positive phase, while less rainfall is recorded in the southern regions during the negative phase. This research study evaluates the varia...
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Apolinario Lujano, Miguel Sanchez-Delgado and Efrain Lujano
The FAO 56 Penman?Monteith equation (PM) is considered the most accurate method for estimating reference evapotranspiration (ETo). However, PM requires a large amount of data that is not always available. Thus, the objective of this study is to improve t...
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Ermindo Barrientos-Pérez, Felipe S. Carevic-Vergara, Juan Pablo Rodriguez, Jorge Arenas-Charlín and José Delatorre-Herrera
The abandonment of ancestral techniques and the incorporation of new technologies in the production systems for the cultivation of quinoa has resulted in overexploitation of soils, a loss of fertility, water imbalance, a loss of native vegetation cover i...
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Charles R. Ortloff and Alan L. Kolata
Raised-field agricultural systems have received attention from scholars involved in the analysis of prehistoric agricultural intensification in the New World. This paper discusses the function of raised fields associated with the Tiwanaku society (500?11...
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Elodie Muller, Magali Ader, Giovanni Aloisi, Cédric Bougeault, Christophe Durlet, Emmanuelle Vennin, Karim Benzerara, Eric C. Gaucher, Aurélien Virgone, Marco Chavez, Pierre Souquet and Emmanuelle Gérard
Interpreting the paleoecosystems of ancient microbialites relies on our understanding of how modern microbialites form in relation with the bio-physico-chemical conditions of their environment. In this study, we investigated the formation of modern carbo...
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José-Carlos Salcedo, Víctor Jiménez Barrado
Pág. e474
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Juan-Manuel Sayol, Veriozka Azeñas, Carlos E. Quezada, Isabel Vigo and Jean-Paul Benavides López
As many other regions worldwide, the Bolivian Altiplano has to cope with water scarcity during dry periods, which in turn impacts on crop production as flood irrigation is overwhelmingly extended in the region. Since farming is the main income in the Alt...
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Beatriz Coira,Claudia I. Galli,Suzanne Mahlburg Kay,Daniel F. Stockli,Patrocinio Flores,Emilio Eveling
Pág. 208 - 237
Ash-fall tuffs of the Pliocene-Pleistocene deposits of Humahuaca and Casa Grande intermountain basins, northwestern Argentina, have been differentiated into two groups based on new geochemical and geochronological data which correspond to the tuffs of th...
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Marcelo García,Germán Aguilar,María Pía Rodríguez,James Metcalf
Pág. 313 - 326
In the Western Cordillera of northern Chile, the Proterozoic-Paleozoic Belén Metamorphic Complex is covered by late Oligocene-early Miocene (25-18 Ma) rocks, and both units are involved in west-vergent contractional deformation, which results in exhumati...
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Gabriel Ureta, Károly Németh, Felipe Aguilera and Rodrigo González
Maar volcanoes are monogenetic landforms whose craters cut below the pre-eruptive surface and are surrounded by a tephra ring. Both the maar crater and the surrounding tephra rim deposits are typically formed due to magma?water explosive interactions. No...
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