| 1. |
- Karmin, Monika, et al.
(författare)
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A recent bottleneck of Y chromosome diversity coincides with a global change in culture.
- 2015
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Ingår i: Genome Research. - : Cold Spring Harbor Laboratory. - 1088-9051 .- 1549-5469. ; 25:4
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Tidskriftsartikel (refereegranskat)abstract
- It is commonly thought that human genetic diversity in non-African populations was shaped primarily by an out-of-Africa dispersal 50-100 thousand yr ago (kya). Here, we present a study of 456 geographically diverse high-coverage Y chromosome sequences, including 299 newly reported samples. Applying ancient DNA calibration, we date the Y-chromosomal most recent common ancestor (MRCA) in Africa at 254 (95% CI 192-307) kya and detect a cluster of major non-African founder haplogroups in a narrow time interval at 47-52 kya, consistent with a rapid initial colonization model of Eurasia and Oceania after the out-of-Africa bottleneck. In contrast to demographic reconstructions based on mtDNA, we infer a second strong bottleneck in Y-chromosome lineages dating to the last 10 ky. We hypothesize that this bottleneck is caused by cultural changes affecting variance of reproductive success among males.
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| 2. |
- Lorenzen, Eline D., et al.
(författare)
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Species-specific responses of Late Quaternary megafauna to climate and humans
- 2011
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 479:7373, s. 359-364
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Tidskriftsartikel (refereegranskat)abstract
- Despite decades of research, the roles of climate and humans in driving the dramatic extinctions of large-bodied mammals during the Late Quaternary period remain contentious. Here we use ancient DNA, species distribution models and the human fossil record to elucidate how climate and humans shaped the demographic history of woolly rhinoceros, woolly mammoth, wild horse, reindeer, bison and musk ox. We show that climate has been a major driver of population change over the past 50,000 years. However, each species responds differently to the effects of climatic shifts, habitat redistribution and human encroachment. Although climate change alone can explain the extinction of some species, such as Eurasian musk ox and woolly rhinoceros, a combination of climatic and anthropogenic effects appears to be responsible for the extinction of others, including Eurasian steppe bison and wild horse. We find no genetic signature or any distinctive range dynamics distinguishing extinct from surviving species, emphasizing the challenges associated with predicting future responses of extant mammals to climate and human-mediated habitat change.
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| 3. |
- Walsh, Matthew J., et al.
(författare)
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Ideas with Histories : Traditional Knowledge Evolves
- 2023
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Ingår i: Arctic. - : The Arctic Institute of North America. - 0004-0843 .- 1923-1245. ; 76:1, s. 26-47
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Tidskriftsartikel (refereegranskat)abstract
- Anthropologists have long been fascinated by the strikingly similar adaptations of circumpolar cultures as well as their puzzling differences. These patterns of diversity have been mapped, studied, and interpreted from many perspectives and often at different social and spatiotemporal scales. While this work has generated vast archives of legacy data, it has also left behind a fragmented understanding of what underpins Arctic cultural diversity and change. We argue that it is time to engage with questions that highlight the roles of socio-environmental learning and cumulative cultural inheritance in shaping human adaptations to Arctic environs. We situate this in light of longue durée adaptations to environmental change. We examine five case studies that have used this framework to explore the genealogy of northern cultural traditions and show how social learning, cultural inheritance, and transmission processes are germane to understanding the generation and change in varied information systems (i.e., traditional knowledge). Specifically, a cultural evolutionary framework enables long-lens insights into human decision-making trajectories, with continued and prescient impacts in the rapidly changing Arctic. It is critical to improve understandings of traditional knowledge not as static cultural phenomena, but as dynamic lineages of information: ideas with histories. Improving knowledge of the dynamic and evolving character of inherited traditional knowledge in circumpolar human-environment interactions must be a research priority given the pressures of accelerating climate change on Indigenous communities and the social-ecological systems in which they exist in order to help buffer cultural systems against future adaptive challenges in the rapidly changing Arctic.
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