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In Situ Conservation Of Crop Genetic Resources In The Mexican Milpa System

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  • Van Dusen, M. Eric

Abstract

This dissertation focuses on the theoretical modeling and empirical testing of household motivations for the in situ conservation of crop genetic resources (CGR). An original household survey is used to test whether the household diversity outcomes are different for the cropping system as a whole, for the principal crop, maize, or for the secondary crops, beans and squash. Agro-ecological characteristics and market characteristics are found to significantly affect the levels of diversity maintained by households. A review of the economic literature relevant to modeling in situ conservation is presented. A theoretical model is developed in which a household's decision to plant a milpa variety is linked to household, agro-ecological, and market variables. A household farm model appropriate to CGR conservation is presented, and extended to the case of missing markets. The agricultural ecology of the Sierra Norte de Puebla is described, as well as the principal CGR in the milpa system. The empirical methodology uses a Poisson regression, for the total number of crop varieties and for each crop group separately. The econometric work is extended to a hurdle model for sample selection, and a SUR model utilizing a Shannon diversity index as a linear measure of diversity. The results from the regressions of household level diversity show that a range of household, village, environmental, and market conditions affect the diversity outcomes. Market integration, measured by distance to a regional market, use of hired labor, and international migration, were found to negatively affect diversity outcomes. Agro-ecological conditions, measured by the number of plots, plots with different slopes, and the high altitude region, all were found to positively increase household diversity outcomes. The econometric findings were different for the combined milpa system than individual crops, and individual crops were affected by different factors. The principal crop, maize, seems mainly affected by the agro-ecological characteristics, while the levels of market integration are found to affect the minor crops, beans and squash. Conclusions are presented on the links between this study and conservation planning issues, and possible directions for future research are discussed.

Suggested Citation

  • Van Dusen, M. Eric, 2000. "In Situ Conservation Of Crop Genetic Resources In The Mexican Milpa System," Dissertations 11941, University of California, Davis, Department of Agricultural and Resource Economics.
    • Handle: RePEc:ags:ucdavd:11941
    DOI: 10.22004/ag.econ.11941
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    Cited by:

    1. Van Dusen, M. Eric & Gauchan, Devendra & Smale, Melinda, 2005. "On farm conservation of rice biodiversity in Nepal," 2005 Annual meeting, July 24-27, Providence, RI 19210, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
    2. Benin, Samuel & Gebremedhin, Berhanu & Smale, Melinda & Pender, John L. & Ehui, Simeon, 2003. "Determinants of cereal diversity in communities and on household farms of the Northern Ethiopian Highlands:," EPTD discussion papers 105, International Food Policy Research Institute (IFPRI).
    3. Ekin Birol & Melinda Smale & Agnes Gyovai, 2005. "Sustainable Use and Management of Crop Genetic Resources: Landraces on Hungarian Small Farms," Environmental Economy and Policy Research Working Papers 02.2005, University of Cambridge, Department of Land Economics, revised 2005.
    4. Smale, Melinda & Olwande, John, 2011. "Is Older Better? Maize Hybrid Change on Household Farms in Kenya," Food Security International Development Working Papers 118474, Michigan State University, Department of Agricultural, Food, and Resource Economics.
    5. Winters, Paul & Cavatassi, Romina & Lipper, Leslie, 2006. "Sowing the seeds of social relations: The role of social capital in crop diversity," ESA Working Papers 289051, Food and Agriculture Organization of the United Nations, Agricultural Development Economics Division (ESA).
    6. Nagarajan, Latha & Smale, Melinda & Glewwe, Paul, 2005. "Comparing farm and village-level determinants of millet diversity in marginal environments of India: the context of seed systems," EPTD discussion papers 139, International Food Policy Research Institute (IFPRI).
    7. Melinda Smale & Leslie Lipper & Phoebe Koundouri, 2006. "Scope, Limitations and Future Directions," DEOS Working Papers 0601, Athens University of Economics and Business.
    8. Benin, Samuel & Smale, Melinda & Gebremedhin, Berhanu & Pender, John L. & Ehui, Simeon K., 2003. "The Determinants Of Cereal Crop Diversity On Farms In The Ethiopian Highlands," 2003 Annual Meeting, August 16-22, 2003, Durban, South Africa 25833, International Association of Agricultural Economists.
    9. Di Falco, Salvatore & Perrings, Charles, 2005. "Crop biodiversity, risk management and the implications of agricultural assistance," Ecological Economics, Elsevier, vol. 55(4), pages 459-466, December.
    10. Amalendu Jyotishi, "undated". "Characterization of Gold Mining Institutions in the Nilgiri-Wayanad Region of India: A Historical-Institutional Perspective," Working papers 114, The South Asian Network for Development and Environmental Economics.
    11. Athukorala, Wasantha & Karunarathna, Muditha & Wilson, Clevo & Managi, Shunsuke, 2020. "Conservation of Genetic Resources of Crops: Farmer Preferences for Banana Diversity in Sri Lanka," Journal of Forest Economics, now publishers, vol. 35(2-3), pages 177-206, March.
    12. Bezabih, Mintewab, 2005. "Biodiversity Conservation Under an Imperfect Seed System: The Role of Community Seed Banking Scheme," 2005 International Congress, August 23-27, 2005, Copenhagen, Denmark 24685, European Association of Agricultural Economists.
    13. Bezabih, Mintewab, 2005. "Biodiversity Conservation under an Imperfect Seed System: the Role of Community Seed Banking Scheme," Working Papers in Economics 185, University of Gothenburg, Department of Economics.
    14. Birol, Ekin & Kontoleon, Andreas & Smale, Melinda, 2005. "Using A Choice Experiment To Estimate The Demand Of Hungarian Farmers For Food Security And Agrobiodiversity During Economic Transition," Environmental Economy and Policy Research Discussion Papers 31937, University of Cambridge, Department of Land Economy.
    15. Ott, Ingrid & Papilloud, Christian & Zülsdorf, Torben, 2008. "What drives innovation? Causes of and Consequences for nanotechnologies," Kiel Working Papers 1455, Kiel Institute for the World Economy (IfW Kiel).
    16. Fernández, Antonio Turrent & Wise, Timothy A. & Garvey, Elise, 2012. "Achieving Mexico’s Maize Potential," Working Papers 179101, Tufts University, Global Development and Environment Institute.
    17. Mintewab Bezabih & Mare Sarr, 2012. "Risk Preferences and Environmental Uncertainty: Implications for Crop Diversification Decisions in Ethiopia," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 53(4), pages 483-505, December.
    18. Wale, Edilegnaw & Virchow, Detlef, 2003. "Crop Diversity As The Derived Outcome Of Farmers' 'Survival First' Motives In Ethiopia: What Role For On-Farm Conservation Of Sorghum Genetic Resources?," 2003 Annual Meeting, August 16-22, 2003, Durban, South Africa 25882, International Association of Agricultural Economists.
    19. Nagarajan, Latha & Smale, Melinda & Glewwe, Paul, 2005. "Local Seed Markets and the Determinants of Crop Variety Diversity in Marginal Environments: The Case of Millet in Semi-Arid India," 2005 Annual meeting, July 24-27, Providence, RI 19445, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
    20. Hayatullah Ahmadzai, 2017. "Status, patterns, and microeconomic drivers of the extent of diversity in crop production: Evidence from Afghanistan," Discussion Papers 2017-07, University of Nottingham, CREDIT.
    21. Smale, Melinda, 2011. "Does Household Headship Affect Demand for Hybrid Maize Seed in Kenya? An Exploratory Analysis Based on 2010 Survey Data," Food Security International Development Working Papers 118475, Michigan State University, Department of Agricultural, Food, and Resource Economics.
    22. Latha Nagarajan & Melinda Smale & Paul Glewwe, 2007. "Determinants of millet diversity at the household‐farm and village‐community levels in the drylands of India: the role of local seed systems," Agricultural Economics, International Association of Agricultural Economists, vol. 36(2), pages 157-167, March.
    23. Melinda Smale & John Olwande, 2014. "Demand for maize hybrids and hybrid change on smallholder farms in Kenya," Agricultural Economics, International Association of Agricultural Economists, vol. 45(4), pages 409-420, July.
    24. Antonio Turrent Fernández & Timothy A. Wise & Elise Garvey, 2012. "Achieving Mexico’s Maize Potential," GDAE Working Papers 12-03, GDAE, Tufts University.
    25. Marianna Fenzi & Paul Rogé & Angel Cruz-Estrada & John Tuxill & Devra Jarvis, 2022. "Community seed network in an era of climate change: dynamics of maize diversity in Yucatán, Mexico," Agriculture and Human Values, Springer;The Agriculture, Food, & Human Values Society (AFHVS), vol. 39(1), pages 339-356, March.

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