Abstract
Theory and empirical data suggest the areas of origin of a crop to be the general area of origin of its coevolved weeds. These longer evolved weeds would have an advantage over species with a shorter evolutionary time and migrate more successfully. We seek to identify patterns by comparing two regions with a shared crop, similar physiographic traits, but little direct contact, one of which is the area of origin of the crop. We compared the diversity of the maize weed flora and its edible components between two rural villages each of Oaxaca, Mexico, and Honde Valley, Zimbabwe, using vegetation sampling, interviews and participatory observation. The Mexican fields had higher species richness and diversity than the Zimbabwean ones. Species richness and densities were higher in the villages that receive more rainfall. Mexican fields had a mainly native weed flora with almost 80% American species and very few of African origin, whereas Zimbabwe had 32% of American and 50% of African origin. The regions shared seven American species and one of African origin. American/Mesoamerican agrestal weeds appear to be more successful in maize. Subsistence farmers in both study areas consumed about 19 edible weed species of which four were common to all villages. Our results also suggest that the presence of 3–4 species of edible weeds per field may be a general pattern in the maize-based systems, and that people not necessarily want or need more, so usefulness—at least as an edible plant—would have a limited influence on migration success.
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Acknowledgments
We would like to thank all the participants from the communities of both Mexico and Zimbabwe for sharing their valuable knowledge and allowing us to work in their maize fields. We also appreciate the assistance given by Dr. S. Koch and R. Vega-Muñoz of CHAPA, Mexico and C. Chapano of SRGH, Zimbabwe in plant identification. The Secretary of the Exterior of Mexico (Secretaría de Relaciones Exteriores) supported the work of the first author.
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Madamombe-Manduna, I., Vibrans, H. & López-Mata, L. Diversity of coevolved weeds in smallholder maize fields of Mexico and Zimbabwe. Biodivers Conserv 18, 1589–1610 (2009). https://doi.org/10.1007/s10531-008-9545-7
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DOI: https://doi.org/10.1007/s10531-008-9545-7