Under what conditions do South American states create regional institutions that consolidate or undermine the liberal international order (LIO)? To address this question, we compare two cases of contestation of the LIO through counter-institutionalization in the domains of migration and election monitoring, both of which are closely related to the LIO’s core political principles. We argue that the variation in the effects of counter-institutionalization—LIO-consolidating in the case of migration and LIO-undermining in the case of election monitoring—results from the interaction of two explanatory factors: the source of dissatisfaction with the LIO’s norms and institutions in a specific domain, and the preferences of the state that exercises regional leadership in support of counter-institutionalization. The article sheds light on the coexistence of liberal and illiberal tendencies in South America’s regionalism and contributes to the debate on the determinants and effects of contestations of the LIO in the Global South.

This article examines the significance of mobility and transportation infrastructure in the early development of pan-Americanism and the formation of a vision of global transportation in South America in the late nineteenth century. Focusing on the 1880s and 1890s, I explore the connection between transportation and the economic and cultural expansionism of the United States, pan-American debates on intercontinental steamship service and an inter-American railroad, and South American approaches to international transportation, which both included and transcended the Americas. My case study contributes to scholarship on the global history of mobility and transportation by showing how, despite the intention of the United States to establish hemispheric exclusivity and hegemony, transportation became a subject of multilateral cooperation. South American experts and diplomats, I argue, renegotiated and reinterpreted the meaning of pan-American infrastructure, integrating it into a broader vision of global transportation that positioned their countries more prominently in worldwide traffic networks.

The capacocha was one of the most important types of Inca sacrifices. Road stations (tambos) were built for the pilgrims who travelled to mountain peaks with the sacrifices. Spatial analysis of two tambos on the slopes of the Pichu Pichu and Chachani volcanoes in Peru reveals segregation in the sacred landscape.

Although radiocarbon-accelerator mass spectrometry (14C-AMS) is an important tool for the establishment of soil chronology, its application is challenging due to the complex nature of soil samples. In the present study, chemical extraction methodologies were tested to obtain the most representative age of Amazonian soil deposition by 14C-AMS. We performed acid hydrolysis with different numbers of extractions, as well as treatments combining acid and bases and quartered and non-quartered samples. The ages of the soil organic matter (SOM) fractions were compared to the ages of naturally buried charcoal samples at similar depths. The results showed that the age of the non-hydrolyzable inert fraction of soil was closer to the age of charcoal and older than the ages of humin. It was also observed that the quartering process can influence the results, since the dating of the humin fraction showed variability in the results. Our results are important to provide information about the most suitable method for the 14C-AMS dating of soil samples for paleoenvironment reconstruction studies.

Radiocarbon dates can offer important corollaries for historic events and processes, including territorial expansion and consolidation in early empires. Eighteen new radiocarbon dates from test excavations at Ak'awillay, near the Inca imperial capital of Cuzco, reveal new perspectives on interactions between the Incas and Xaquixaguana Valley groups. Rather than persisting as a regional centre, Ak'awillay declined well before early Inca expansion, remaining largely unoccupied until after an extensive empire had been established. This new chronology adds nuance to the growing understanding of local group interactions and how they contributed to Inca state development and imperial expansion.

At Ollantaytambo, in the Cusco region of Peru, the Inka (c. AD 1400–1532) built an elaborate anthropogenic landscape to facilitate intensive agriculture. After the 1532 Spanish invasion of the region, this landscape was reshaped by the introduction of new plants and animals, colonial land-management practices and demographic transformations. Here, the author employs botanical data from a derelict Inka-era reservoir to evaluate the timing and character of colonial transformations to the local agroecology. These transformations, they argue, tended towards agricultural deintensification, but this process did not begin until decades after the Spanish invasion.

This project employs a geoarchaeological approach to explore human occupation of the highland wetlands (bofedales) and salt flats of the Dry Puna of northern Chile (>2500m above sea level) during the Holocene. Differences in the archaeological record of each ecosystem are tentatively suggested to relate to settlement patterns and the history of the landscape.

Limited research exists on preceramic sites in south-central coastal Peru. Systematic survey and excavations at Pampa Lechuza, Ica, now confirm a Late Pleistocene–Early Holocene Paiján (13 000–9000 cal BP) occupation and identify Quispisisa-sourced obsidian Paiján points, which are the only examples currently known to use this raw material.

While a clear human presence may be recognised in the Andes by 12 000–11 000 cal BP, most archaeological research has focused on occupation of the Andean highlands. To understand the initial occupation of inland areas of South America, the authors consider regional connections and spatial exploitation strategies of hunter-gatherers highlighted in a recent survey of Andean sites. Focusing on north-central Chile, artefacts and radiocarbon dates from three rock shelters suggest sporadic and brief occupation during the Terminal Pleistocene–Early Holocene. Co-occurrence of marine and montane resources, the authors argue, demonstrates a strategy of high mobility and local adaptation in early Andean occupation, using rock shelters as landmarks to navigate and learn new landscapes.

In Northeastern Brazil, successful release programmes have been implemented for the conservation of West Indian manatees (Trichechus manatus) since the 1990s. Recently, the non-government organization AQUASIS started releasing manatees in the state of Ceará, where oceanographic conditions and the absence of sheltered places pose new challenges for the release and monitoring of manatees. This research investigates the movement of a manatee named Tico, released in Icapuí, Ceará, Brazil, that travelled approximately 4017 km over 62 days through deep oceanic waters. Correlating Tico's trajectory and velocity with surface currents revealed the influence of the North Brazil Current (NBC) and its vortices on his movement. Tico crossed the diluted Amazon River plume with surface salinity as low as 26 g kg−1 in early August, potentially encountering areas of even lower salinity. Additionally, Tico experienced several storms, with significant rainfall during his journey, which may have provided freshwater. The erratic movement patterns and significant weight loss prompted the rescue of Tico on Isla la Blanquilla, Bolivarian Republic of Venezuela. Tico is currently being temporarily housed in Parque Zoológico y Botánico Bararida in Venezuela. Understanding the nature of Tico's long-distance movement could help inform decisions about his future. AQUASIS proposes to return Tico to Brazil, a region with an ecologically and genetically distinct population from Venezuela, for a second release attempt, incorporating lessons learned from the first release. Furthermore, AQUASIS has the necessary human and financial resources to ensure the continuous monitoring of Tico during his readaptation to the wild.

The expansion of soybean cultivation in South America has created substantial economic prosperity but has also raised a series of unsustainable land-use issues. Considering the telecoupling system (a system of socio-ecological interactions between distant places) between South America and its soybean trade partners, transnational governance could play an important role in addressing these issues. To achieve effective governance of this specific telecoupling system, this study applies a polycentric approach to improve the existing transnational governance and identify more suitable governance arrangements. This study first explores the telecoupling system and the existing transnational governance system of soybean land use in South America. It then compares the existing governance system with the polycentric approach to examine the gaps between them. Based on these analyses, suggestions for improving the governance system are provided, including increasing the involvement of major governance centres, improving public-private partnerships, and establishing a knowledge-sharing platform.

The aim of this study was to examine the presence of tick-borne rickettsial bacteria in Rhipicephalus sanguineus sensu stricto ticks collected from dogs in the Patagonian region of Argentina. Fourteen stray dogs from Valcheta, Río Negro province, Argentina were examined for the presence of R. sanguineus s.s. ticks. Ninety ticks were collected and identified to species level. DNA was extracted and analysed by conventional PCR assays for the presence of tick-borne bacteria belonging to the genera Anaplasma, Ehrlichia and Rickettsia. Thirty-three tick pools were tested by different PCR assays of which 3 were positive for Anaplasmataceae bacteria. From the 3 Anaplasmataceae positive samples, 2 partial 16S rDNA sequences were generated and belonging to Anaplasma platys, the causative agent of canine cyclic thrombocytopenia. Two tick samples were positive in Rickettsia specific PCR assays and were identified by phylogenetic analysis as Rickettsia massiliae, a member of the spotted fever group rickettsiae. The results of this study demonstrate the molecular detection of 2 rickettsial bacteria in R. sanguineus s.s. in a region of Argentina where no data were available so far.

Over the last few years, during the pandemic, the Brazilian population has suffered several problems, ranging from health to socioeconomic impacts. When we consider Brazilian science, there has been an undeniable scientific delay generated by the pandemic, especially in areas that are not related to the coronavirus. In this context, with the aim of fostering collaboration among researchers in the field of Developmental Origins of Health and Diseases (DOHaD) and enhancing the potential for implementing public health strategies to prevent noncommunicable chronic diseases, the Brazilian Association of Developmental Origins of Health and Diseases (DOHaD Brazil) was established in 2020. In this narrative, we explore the effects of the COVID-19 pandemic in Brazil, focusing on its impacts on scientific research conducted in universities. Additionally, we underscore the significance of the DOHaD Brazil Association, particularly from the perspective of young researchers engaged in DOHaD research in Brazil.

Archaeological cultures present allegories of ethnic identities across the centuries or millennia but such conceptualisations are necessarily incomplete and lack the resolution to explore transitions between cultures. Here, exploration of the archaeological contexts, production methods, stylistic variation and radiocarbon dating of 20 preserved textile fragments facilitates an examination of cultural change at Huaca del Sol (Huacas de Moche, northern Peru). While occupants of the site experienced many outside cultural influences, including those from the highland Wari Empire, continuity in textile traditions suggests that some sense of Moche identity was maintained through the tenth century and after the perceived end of the Moche culture.

Systematic investigation of caves and rockshelters in Uruguay is revealing the archaeological importance of these sites and their association with earthen mounds. Multiple periods of human occupation at Tamanduá rockshelter are revealed through stratigraphic analysis, and radiocarbon dates suggest recurrent occupation from the Early Holocene up to the historic period.

Rock art of the Middle and Upper Orinoco River in South America is characterised by some of the largest and most enigmatic engravings in the world, including snakes exceeding 40m in length. Here, the authors map the geographic distribution of giant snake motifs and assess the visibility of this serpentine imagery within the Orinoco landscape and Indigenous myths. Occupying prominent outcrops that were visible from great distances, the authors argue that the rock art provided physical reference points for cosmogonic myths, acting as border agents that structured the environment and were central to Indigenous placemaking along the rivers of lowland South America.