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♦ 1How Important are Columnar Cacti as Sources of Water and Nutrients for Desert Consumers? A Review, B. O. Wolf and C. Martínez del Rio, Isotopes Environ. Health Stud., 2003, Vol. 39(1), pp. 53-67
♦ 2Seed predation and dispersal in a dominant desert plant: Opuntia, ants, birds, and mammals, Mario González-Espinosa and Pedro F. Quintana-Ascencio, Frugivores and Seed Dispersal (eds A. Estrada & T. H. Fleming.), pp. 273284. Dr W. Junk, Publishers, Dordrecht.