The Enigma of the Great Cities: Body and State in Amazonia

This paper discusses issues of political power in Amazonia, particularly with regard to traditional definitions of the State, in general, and the body or person in Amazonia. Using the historical ethnography of the Upper Xingu region of southern Amazonia as a point of departure, issues of inequality, hierarchy, and social complexity are briefly discussed. Specifically, it is suggested that Xinguano cultural patterns, considered over the long term (circa 800 C.E.–present), show evidence of social hierarchy and regional organization considered characteristic of so-called complex societies elsewhere. As is true in many ancient states and chiefdoms, power is based on strategic control of ritual, social space, and history, rather than economic or adminstrative centralization, but is nonetheless tied to a logic of social hierarchy that pervades the body, space, and landscape. Este artigo discute idéias de poder político em Amazônia, especialmente a respeito das definições tradicionais do Estado em geral, e do corpo ou a pessoa em Amazônia. Usando a história etnográfica da região do Alto Xingu no sul do Brasil como ponto de partida, se discutem brevemente conceitos de desigualdade, hierarquia e complexidade social. Especificamente, se sugere que padrões culturais Xinguanos, considerados a longo praço (do ano 800 ao presente), mostram evidência de hierarquia, social e organização regional, características das denominadas sociedades complexas de outras regiões. Como é verdade de muitos antigos estados e chefias, o poder é baseado no controle estratégico do ritual, do espaço social, e da história, em vez da centralização econômica ou administrativa, mas ainda assim está conectada a uma lógica de hierarquia social que penetra o corpo, o espaço, e o paisage

Participatory Mapping of Mid-Holocene Anthropogenic Landscapes in Guyana with Kite Aerial Photography

The nature and degree of human modifications of humid tropical forests in Amazonia have been widely debated over the past two decades Many regions provide significant evidence of late Holocene anthropogenic influence by settled populations but the antiquity of human interventions is still poorly understood due to a lack of earlier archaeological sites across the broad region particularly pertaining to the mid-Holocene Here we report on Amerindian occupations spanning the period from ca 6000-3000 BP along the middle Berbice River Guyana including early evidence in Amazonia of cultural practices widely considered indicative of settled villages notably terra preta or black earth soils mound construction and ceramic technology These more settled occupations of the mid-Holocene initiated a trajectory of landscape domestication extending into historical times including larger-scale late Holocene social formations Collaborative research with local indigenous communities including archaeological excavations landscape mapping using kite based aerial photography and three-dimensional photogrammetry was designed to promote the decolonization of archaeological knowledge production and encourage indigenous ownership of Amerindian history and cultural heritage in Guyan

De onde surgem os modelos? As origens e expansões Tupi na Amazônia Central

This article presents archaeological data for the debate - revisited in the Revista de Antropologia by Franciso Noelli, Eduardo Viveiros de Castro and Greg Urban - on a putative origin of the Tupí languages in the Central Amazon. We present here the preliminary results of the archaeological research we have been undertaking in the area of confluence of the Negro and Solimões rivers which seem not to support the archaeological premises of this model, first presented by Donald Lathrap in 1970.Este artigo apresenta subsídios arqueológicos para o debate - revisitado por Franciso Noelli, Eduardo Viveiros de Castro e Greg Urban nas páginas da Revista de Antropologia - sobre a suposta origem das línguas do tronco Tupí na Amazônia central. Apresentamos aqui os resultados preliminares de nossas pesquisas arqueológicas na área de confluência dos rios Negro e Solimões que levantam restrições às premissas arqueológicas desse modelo, primeiramente apresentadas por Donald Lathrap em 1970

Intentional creation of carbon-rich dark earth soils in the Amazon

Fertile soil known as Amazonian dark earth is central to the debate over the size and ecological impact of ancient human populations in the Amazon. Dark earth is typically associated with human occupation, but it is uncertain whether it was created intentionally. Dark earth may also be a substantial carbon sink, but its spatial extent and carbon inventory are unknown. We demonstrate spatial and compositional similarities between ancient and modern dark earth and document modern Indigenous practices that enrich soil, which we use to propose a model for the formation of ancient dark earth. This comparison suggests that ancient Amazonians managed soil to improve fertility and increase crop productivity. These practices also sequestered and stored carbon in the soil for centuries, and we show that some ancient sites contain as much carbon as the above-ground rainforest biomass. Our results demonstrate the intentional creation of dark earth and highlight the value of Indigenous knowledge for sustainable rainforest management

Simple sequence repeats in Neurospora crassa: distribution, polymorphism and evolutionary inference

<p>Abstract</p> <p>Background</p> <p>Simple sequence repeats (SSRs) have been successfully used for various genetic and evolutionary studies in eukaryotic systems. The eukaryotic model organism <it>Neurospora crassa </it>is an excellent system to study evolution and biological function of SSRs.</p> <p>Results</p> <p>We identified and characterized 2749 SSRs of 963 SSR types in the genome of <it>N. crassa</it>. The distribution of tri-nucleotide (nt) SSRs, the most common SSRs in <it>N. crassa</it>, was significantly biased in exons. We further characterized the distribution of 19 abundant SSR types (AST), which account for 71% of total SSRs in the <it>N. crassa </it>genome, using a Poisson log-linear model. We also characterized the size variation of SSRs among natural accessions using Polymorphic Index Content (PIC) and ANOVA analyses and found that there are genome-wide, chromosome-dependent and local-specific variations. Using polymorphic SSRs, we have built linkage maps from three line-cross populations.</p> <p>Conclusion</p> <p>Taking our computational, statistical and experimental data together, we conclude that 1) the distributions of the SSRs in the sequenced N. crassa genome differ systematically between chromosomes as well as between SSR types, 2) the size variation of tri-nt SSRs in exons might be an important mechanism in generating functional variation of proteins in <it>N. crassa</it>, 3) there are different levels of evolutionary forces in variation of amino acid repeats, and 4) SSRs are stable molecular markers for genetic studies in <it>N. crassa</it>.</p

Evidence confirms an anthropic origin of Amazonian Dark Earths.

Arising from: Silva et al. Nature Communications https://doi.org/10.1038/s41467-020-20184-2 (2021

Does soil pyrogenic carbon determine plant functional traits in Amazon Basin forests?

Amazon forests are fire-sensitive ecosystems and consequently fires affect forest structure and composition. For instance, the legacy of past fire regimes may persist through some species and traits that are found due to past fires. In this study, we tested for relationships between functional traits that are classically presented as the main components of plant ecological strategies and environmental filters related to climate and historical fires among permanent mature forest plots across the range of local and regional environmental gradients that occur in Amazonia. We used percentage surface soil pyrogenic carbon (PyC), a recalcitrant form of carbon that can persist for millennia in soils, as a novel indicator of historical fire in old-growth forests. Five out of the nine functional traits evaluated across all 378 species were correlated with some environmental variables. Although there is more PyC in Amazonian soils than previously reported, the percentage soil PyC indicated no detectable legacy effect of past fires on contemporary functional composition. More species with dry diaspores were found in drier and hotter environments. We also found higher wood density in trees from higher temperature sites. If Amazon forest past burnings were local and without distinguishable attributes of a widespread fire regime, then impacts on biodiversity would have been small and heterogeneous. Alternatively, sufficient time may have passed since the last fire to allow for species replacement. Regardless, as we failed to detect any impact of past fire on present forest functional composition, if our plots are representative then it suggests that mature Amazon forests lack a compositional legacy of past fire