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References

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  • Brower, L.P., Kust, D.R., Rendon-Salinas, E., Serrano, E.G., Kust, K.R., Miller, J., Fernandez del Rey, C. K. & Pape, K. (2004) Catastrophic winter storm mortality of monarch butterflies in Mexico in January 2002. Monarch Butterfly Biology and Conservation (ed. by K.M. Oberhauser and M. Solensky), pp. 151166. Cornell University Press, Ithaca, New York.
  • Brower, L.P., Taylor, O.R., Williams, E.H., Slayback, D.A., Zubieta, R.R. & Ramirez, M.I. (2011) Decline of monarch butterflies overwintering in Mexico: is the migratory phenomenon at risk? Insect Conservation and Diversity, doi: 10.1111/j.1752-4598.2011.00142.x.
  • Davis, A.K. (2011) Are migratory monarchs really declining in eastern North America? Examining evidence from two fall census programs. Insect Conservation and Diversity, doi: 10.1111/j.1752-4598.2011.00158.x.
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  • M.L.M.P. (2010) Monarch Larva Monitoring Project, Univ. Minnesota. <http://www.mlmp.org> 15th August 2011.
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  • Rendon-Salinas, E., Valera-Bermejo, C.A., Cruz-Pina, M. & Martinez-Meza, F. (2011) Monitoreo de las colonias de hibernacion de mariposa monarca: Superficie forestal de ocupacion en Diciembre de 2010. World Wildlife Fund Mexico, Mexico City. <http://www.wwf.org.mx/wwfmex/descargas/rep-monitoreo-superficie-colonias-mariposa-monarca-alianza-wwf-telcel-DIC2010.pdf> 15th August 2011.
  • U.S.D.A. (2011) Adoption of genetically engineered crops in the U.S. U.S.D.A. Economic Research Service. <http://www.ers.usda.gov/Data/BiotechCrops/> 18th August 2011.
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