Pollen selection was determined by two methods for three ground-nesting bees: anal-ysis of nest cell contents (provisions or feces), and of female pollen foraging records. Ancyloscelis wheeleri Cockerell and Melitoma marginella Cresson (Anthophoridae) were oligolectic on different genera of Convolvulaceae.The two methods differed in emphasis of particular hosts. Mesoxaea nigerrima Friese (Oxaeidae) had unrelated hosts in different months. As many as nine pollen species were found in a single cell, but the dominant pollen comprised at least 95% in most cells for all three bee species. Not all minor pollen species were clearly contaminants.
Bullock, Stehpen H.; Ayala, Ricardo; Rodriguez-Gonzalez, Gregorio; Palacios-Chaves, Rodolfo; Ramos-Zamora, Delfina; Quiroz-Garcia, D. Leonor; and Arreguin-Sanchez, Maria de la Luz, "Nest Provision and Pollen Foraging in Three Mexican Species of Solitary Bees (Hymenoptera: Apoidea)" (1991). Bu. Paper 5.
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