ArticleProceedings of the National Academy of Sciences of the United States of America2016
Seed exchange networks, ethnicity, and sorghum diversity.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers.
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19 citing papers in PubMed, 91 citations in OpenAlex.
- Rooted in culture, constrained by means: exploring crops and associated motivations among Masikoro and Antandroy farmers in Southwestern Madagascar.Journal of ethnobiology and ethnomedicine · 2026Article
- Socio-agronomic features define the structure of socioecological seed exchange network and "on farm" conservation of agrobiodiversity in quilombola communities in Brazil.Journal of ethnobiology and ethnomedicine · 2026Article
- Genetic diversity and environmental adaptation in Ethiopian tef.G3 (Bethesda, Md.) · 2025Article
- Ethnobotanical studies on rice landraces under on-farm conservation in Xishuangbanna of Yunnan Province, China.Journal of ethnobiology and ethnomedicine · 2024Article
- Legume seed system performance in sub-Saharan Africa: barriers, opportunities, and scaling options. A review.Agronomy for sustainable development · 2024Review
- Biocultural diversity and crop improvement.Emerging topics in life sciences · 2023Review
- Article
- Kinship networks of seed exchange shape spatial patterns of plant virus diversity.Nature communications · 2021Article
- Genetic diversity of Ethiopian sorghum reveals signatures of climatic adaptation.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2021Article
- Trees and their seed networks: The social dynamics of urban fruit trees and implications for genetic diversity.PloS one · 2021Article
- Prestige and homophily predict network structure for social learning of medicinal plant knowledge.PloS one · 2020Article
- Abandonment of pearl millet cropping and homogenization of its diversity over a 40 year period in Senegal.PloS one · 2020Article
- The maintenance of stable yield and high genetic diversity in the agricultural heritage torreya tree system.BMC ecology · 2019Article
- Modeling Epidemics in Seed Systems and Landscapes To Guide Management Strategies: The Case of Sweet Potato in Northern Uganda.Phytopathology · 2019Article
- Genomic signatures of adaptation to Sahelian and Soudanian climates in sorghum landraces of Senegal.Ecology and evolution · 2019Article
- Preservation of the genetic diversity of a local common carp in the agricultural heritage rice-fish system.Proceedings of the National Academy of Sciences of the United States of America · 2018Article
- Genetic diversity, population structure, and traditional culture ofEcology and evolution · 2017Article
- Unexpected pattern of pearl millet genetic diversity among ethno-linguistic groups in the Lake Chad Basin.Heredity · 2017Article
- Past and present dynamics of sorghum and pearl millet diversity in Mount Kenya region.Evolutionary applications · 2016Article
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Authors and funding
4 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Recent studies investigating the relationship between crop genetic diversity and human cultural diversity patterns showed that seed exchanges are embedded in farmers' social organization. However, our understanding of the social processes involved remains limited. We investigated how farmers' membership in three major social groups interacts in shaping sorghum seed exchange networks in a cultural contact zone on Mount Kenya. Farmers are members of residence groups at the local scale and of dialect groups clustered within larger ethnolinguistic units at a wider scale. The Chuka and Tharaka, who are allied in the same ethnolinguistic unit, coexist with the Mbeere dialect group in the study area. We assessed farmers' homophily, propensity to exchange seeds with members of the same group, using exponential random graph models. We showed that homophily is significant within both residence and ethnolinguistic groups. At these two levels, homophily is driven by the kinship system, particularly by the combination of patrilocal residence and ethnolinguistic endogamy, because most seeds are exchanged among relatives. Indeed, residential homophily in seed exchanges results from local interactions between women and their in-law family, whereas at a higher level, ethnolinguistic homophily is driven by marriage endogamy. Seed exchanges and marriage ties are interrelated, and both are limited between the Mbeere and the other groups, although frequent between the Chuka and Tharaka. The impact of these social homophily processes on crop diversity is discussed.
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