Long-term resilience of late holocene coastal subsistence system in Southeastern South america.

Isotopic and molecular analysis on human, fauna and pottery remains can provide valuable new insights into the diets and subsistence practices of prehistoric populations. These are crucial to elucidate the resilience of social-ecological systems to cultural and environmental change. Bulk collagen carbon and nitrogen isotopic analysis of 82 human individuals from mid to late Holocene Brazilian archaeological sites (∼6,700 to ∼1,000 cal BP) reveal an adequate protein incorporation and, on the coast, the continuation in subsistence strategies based on the exploitation of aquatic resources despite the introduction of pottery and domesticated plant foods. These results are supported by carbon isotope analysis of single amino acid extracted from bone collagen. Chemical and isotopic analysis also shows that pottery technology was used to process marine foods and therefore assimilated into the existing subsistence strategy. Our multidisciplinary results demonstrate the resilient character of the coastal economy to cultural change during the late Holocene in southern Brazil

Genomic history of coastal societies from eastern South America

Sambaqui (shellmound) societies are among the most intriguing archaeological phenomena in pre-colonial South America, extending from approximately 8,000 to 1,000 years before present (yr bp) across 3,000 km on the Atlantic coast. However, little is known about their connection to early Holocene hunter-gatherers, how this may have contributed to different historical pathways and the processes through which late Holocene ceramists came to rule the coast shortly before European contact. To contribute to our understanding of the population history of indigenous societies on the eastern coast of South America, we produced genome-wide data from 34 ancient individuals as early as 10,000 yr bp from four different regions in Brazil. Early Holocene hunter-gatherers were found to lack shared genetic drift among themselves and with later populations from eastern South America, suggesting that they derived from a common radiation and did not contribute substantially to later coastal groups. Our analyses show genetic heterogeneity among contemporaneous Sambaqui groups from the southeastern and southern Brazilian coast, contrary to the similarity expressed in the archaeological record. The complex history of intercultural contact between inland horticulturists and coastal populations becomes genetically evident during the final horizon of Sambaqui societies, from around 2,200 yr bp, corroborating evidence of cultural change

Posterpräsentation der Promovierenden : Abstract-Band ; Promovierendentag 2023

Diese Sammlung enthält die Abstracts der Poster, die im Rahmen des Promovierendentages 2023 von kooperativ promovierenden Doktorandinnen und Doktoranden an der Hochschule für Angewandte Wissenschaften Hamburg (HAW Hamburg) präsentiert werden. Sie geben einen Einblick in spannende, durch wissenschaftliches Niveau und Praxisnähe geprägte Forschungsvorhaben.NonPeerReviewe

Reconstructing the Deep Population History of Central and South America

We report genome-wide ancient DNA from 49 individuals forming four parallel time transects in Belize, Brazil, the Central Andes, and the Southern Cone, each dating to at least 9,000 years ago. The common ancestral population radiated rapidly from just one of the two early branches that contributed to Native Americans today. We document two previously unappreciated streams of gene flow between North and South America. One affected the Central Andes by 4,200 years ago, while the other explains an affinity between the oldest North American genome associated with the Clovis culture and the oldest Central and South Americans from Chile, Brazil, and Belize. However, this was not the primary source for later South Americans, as the other ancient individuals derive from lineages without specific affinity to the Clovis-associated genome, suggesting a population replacement that began at least 9,000 years ago and was followed by substantial population continuity in multiple regions

ANÁLISE DE INVESTIMENTO NA ATIVIDADE AVÍCOLA COM BASE NO MODELO ESTOCÁSTICO

O modelo de análise de investimento mais utilizada é a tradicional (determinística), porém possui a limitação de não incorpora os riscos endógenos e exógenos. Sendo assim, este estudo objetiva realizar uma análise comparativa entre a análise de investimento no setor avícola pelo método determinístico e estocástico. A metodologia empregada é qualiquantitativa, descritiva e o estudo de caso, sendo que a obtenção dos dados foi por meio de entrevista estruturada e pesquisa documental primária. Os resultados revelam que a análise determinística sugere que o investimento é inviável, em função da VPL<0 e a TIR<TMA. A análise estocástica do investimento, por intermédio do software @Risk ao considerar os riscos que podem interferir no setor avícola, sugere que há uma probabilidade de 44,43% do VPL ≥ 0 e uma probabilidade de 40,9% da TIR ≥ TMA. A análise estocástica não exclui, mas abrange a análise determinista, neste sentido, a estocástica apresenta as informações e dados com maior consistência e assertividade. Conclui-se que a análise estocástica fortalece a decisão sobre o investimento, pois ao incluir os riscos e gerar cenários apresenta o percentual de chance do investimento ser viável ou inviável