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- The role of environmental changes in the development of the agricultural economy during pre-aksumite and aksumite culturesPublication . Mekonnen, Degsew Z.; Olivera, Hugo R.; Gomes, Ana; Mekonnen, DegsewThe northern highlands of Ethiopia and Eritrea (NHE) hosted the earliest agricultural and urban societies in sub-Saharan Africa: the Pre-Aksumite and Aksumite cultures. However, the role of environmental shifts in the transition from hunting-gathering to agriculture and state formation remains unclear. This study reviews 95 peer-reviewed articles on paleoenvironmental data from the NHE and adjacent regions (6000-1000 BP), integrating recent archaeobotanical and archaeological findings. We draw three main conclusions: (1) Paleoenvironmental conditions during this transition were highly variable, with differing tempos and magnitudes of change across the region. (2) The emergence of early agriculture and Pre-Aksumite societies in the NHE was not directly driven by environmental changes around 3500 BP. Instead, social dynamics and interactions among local human groups provided a more plausible explanation. (3) The NHE highlands experienced a shift towards higher humidity during early Aksumite period, specifically between 2500 and 2000 BP and 1500 and 1000 BP. This climatic shift likely enhanced agricultural productivity, facilitating food surpluses that underpinned the expansion of the Aksumite Kingdom. These results suggest that while early agriculture was culturally driven, later state development was more closely tied to environmental factors. To understand the interplay between environmental and socio-cultural factors in the NHE, we recommended interdisciplinary approach integrating, paleoenvironmental, archaeological, and archaeobotanical and genetic studies. This will enhance data resolution, mitigate geographical biases, and refine our understanding of complex societies in the Horn of Africa.
- The genomics of t’ef and finger millet domestication and spreadPublication . Mekonnen, Degsew; Gomes, Ana; Machado, Rui; Oliveira, HugoThe Northern Highlands of Ethiopia and Eritrea (NHE) were a centre for food production in Africa, hosting one of the earliest agriculture-based complex societies on the continent. The NHE's geographical connections with the Arabian Peninsula, and Nilotic cultures led to the cultivation of southwest Asian crops and African native domesticates in its territory. Additionally, the NHE were also the domestication centre for crops like t'ef (Eragrostis tef (Zucc.) Trotter) and finger millet (Eleusine coracana L. Gaertn L.), after well-adapted local wild plants. Considering the paucity of the archaeobotanical record in the region and food remains' preservation issues, in this study, we aim to investigate the domestication and spread of t'ef and finger millet using genomics and interpreting the results in the light of archaeological proxies. Our data confirmed Eragrostis pilosa and Eleusine coracana subsp. africana as the sole wild progenitors of t'ef and finger millet, respectively. T'ef was initially domesticated in the NHE before spreading into southern Ethiopia and eastwards into southern Arabia. Finger millet spread followed two routes: one leading eastwards through the Red Sea to India, and the other southwards, through Kenya and Uganda, reaching southern Africa.This article is part of the theme issue 'Unravelling domestication: multi-disciplinary perspectives on human and non-human relationships in the past, present and future'.