Este trabajo de tecnología lítica aborda los cambios acontecidos durante las ocupaciones de las últimas poblaciones cazadoras-recolectoras-domesticadoras, y de las sociedades agropastoriles tempranas en la Puna de Jujuy. En particular, tiene como objetivo reconstituir las cadenas operativas y los sistemas técnicos a partir de tres sitios de la cuenca de Barrancas entre aproximadamente 3750 y 1550 años cal aP. Los resultados comprenden varios análisis cuantitativos —incluyendo riqueza y diversidad— sobre las materias primas, los métodos de desbaste y de façonnage, y las unidades tecno-funcionales prensiles (UTFp). Los resultados demuestran que, a pesar de observarse continuidades, los cambios tecnológicos son significativos e incluyen rupturas. En particular, las evidencias indican una reorganización de los sistemas técnicos y de la gestión de las materias primas. Uno de los aspectos destacables es que el enastilamiento de instrumentos fue más importante durante el Holoceno medio que en el Holoceno tardío. Estos cambios se interpretan en el marco de una reestructuración social, económica y ecológica.

Este trabajo busca profundizar el conocimiento sobre el rol de los sectores intermedios de las quebradas en el entramado social de la microrregión de Antofagasta de la Sierra (Puna meridional argentina) a lo largo del tiempo. A través del estudio de la tecnología cerámica desde una perspectiva diacrónica (ca. 2000-500 aP), haciendo énfasis en los estudios petrográficos de pastas, se investigan los cambios y continuidades en la producción alfarera de la microrregión. Para ello, se presentan los resultados de la investigación realizada sobre el material cerámico proveniente de los sitios de Las Escondidas y Corral Alto, en la quebrada del Río Miriguaca, y Cueva Salamanca 1, en la quebrada del Río Las Pitas. A partir de los análisis realizados, se pudo concluir que existieron cambios en los modos de hacer cerámica a lo largo del tiempo en la microrregión. Se observó que durante el Formativo (ca. 2000 aP) existió un modo de hacer compartido en un área amplia, mientras que durante el periodo Tardío (ca. 800 aP) se dio una fragmentación en las prácticas de producción cerámica en la microrregión. Estos cambios responden a profundas trasformaciones ocurridas en las sociedades puneñas que se comenzaron a gestar tiempo antes del comienzo del período Tardío en un proceso paulatino, complejo y heterogéneo.

We combined tools of phylogeography, population genetics and biogeographical interpretation to analyse a group of phylogenetically independent lineages (animals and plants) that coexist within the same geographical region, yet under markedly different environments, in order to identify generalized barriers for gene flow. We tested the hypothesis that major geographic features have produced a concordant genetic structure in phylogenetically independent lineages. A rigorous bibliographic search was performed, selecting available molecular information from six taxa occupying distinct southern biomes of South America: Yungas, Prepuna, Puna and northern Monte. We estimated within-population genetic diversity, the genetic structure and haplotype phylogenies to assemble distribution maps of genetic barriers for each species. We found a strong association between genetic variation and latitudinal distribution of populations. We detected a major barrier for six taxa at 27°S latitude and a second one for a group of three species at 25–26°S. Two alternative non-exclusive hypotheses – geology and/or climate – explain concordant genetic barriers in divergent lineages. We suggest that the term ‘biogeographically significant units’ portrays a group of populations of phylogenetically unrelated taxa that inhabit the same geographic region that have been similarly impacted by major physical events, which can be used to identify priority areas in landscape conservation.

The transition from the Formative to the Late period (c. 1000 BP) on the volcanic plateau of Antofagasta de la Sierra in northern Argentina saw various changes in landscape use and settlement pattern. New power structures and social identities appear in the archaeological record in the wake of an increasing emphasis on cultivation and herding, coincident with a regional shift to greater aridity. The novel analysis reported here reveals that these changes also had an impact on pottery technology, notably vessel thickness, and considers the role of technological innovation as both cause and consequence of the changing world experienced by the inhabitants of Antofagasta de la Sierra.

Argentina's annual camelid fibre production is estimated at 60 000 kg for llama (Lama glama), somewhat more than 2 000 kg for guanaco (Lama guanicoe) and about 845 kg for vicuña (Vicugna vicugna). The potential for increasing these amounts is huge considering that barely 30 percent of llamas are shorn and considering the size of the wild camelid population in the country. A compilation of published and unpublished work confirms that almost 50 percent of the llamas are single-coated, about 40 percent have white fleeces and that average fibre diameter is about 22 µm in the main llama production area. In general, there is a wide variation in fleece weights and fibre quality between and within herds. However, a llama fleece classing and pricing system is not yet in place to motivate implementation of breeding programmes. Guanaco and vicuña fleeces are double-coated but the fine undercoat represents more than 80 percent of the fleece weight. The proportion of down fibre remaining after mechanical dehairing is only 50 percent in guanacos and 70 percent in vicuñas. The guanaco undercoat fibre diameter is about 16 µm and vicuña fibre diameter is typically between 13 and 14 µm. Both fibres are relatively short. Research is needed to establish optimum shearing season and shearing frequency that results in fibre quality demanded for handcraft and industry in each of the three species.

In the present study, body length and dispersal ability were examined in carabid beetles (Coleoptera: Carabidae) sampled in the Peruvian Andes along two altitudinal gradients: old-growth forest and anthropogenically disturbed region. Dispersal ability was estimated by the flight-wing condition (i.e. macropterous or brachypterous) and the cuticular length of the flight muscle (medial length of the metasternum). The relationship between body length and altitude for combined gradients varied by tribe; all possible relationships were found: positive; negative; no relationship. At the family level, a negative relationship between altitude and insect body length was found; this was predicted because of a decrease in the diversity of resources, habitat area and primary productivity, and the increase in the unfavourable environment observed at high altitudes. Flight muscle length was also highly variable among tribes; however, for combined gradients, a negative correlation with altitude was found at the family level. Some tribes were either completely macropterous or brachypterous, but at the family level, the percentage of brachyptery increased with altitude. We suggest two hypotheses that may explain the increased incidence of flightlessness observed with increasing altitude: constraints of energy use and reduced need for dispersal potential. At the family level, carabid beetles tended to have a greater body length and decreased brachyptery in disturbed regions compared with old-growth forests. Increased dispersal ability was expected because of the need to find a suitable habitat in disturbed areas. Observed relationships may depend upon which tribes are examined and whether the forest on an altitudinal gradient has been disturbed.

Few published records exist for the Endangered Andean mountain cat Oreailurus jacobita, a rare and little known felid restricted to high altitudes of the Andes of South America. We present 20 new records for the species, and analyse its altitudinal overlap with the sympatric pampas cat Oncifelis colocolo, a widespread habitat generalist, in north-west Argentina. Our data confirm the recent presence of the Andean mountain cat at several locations in Jujuy, Salta, and Catamarca provinces. Nevertheless, densities appear to be much lower than those of the pampas cat. This Lower Risk, near threatened species represented 68% of the records for small cats at high altitudes and its altitudinal range overlapped with the lower 1,000 m of the range of the Andean mountain cat. Protected areas for the Andean mountain cat in Argentina should be above 3,500 m and have a high proportion of habitat above 4,000 m, where the abundance of potential competitors is lower.