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Centris flavifrons is a ground-nesting solitary bee species that has an important role in crop and native plant species pollination in the Neotropical region. However, the nesting biology and ecology of this species are little understood. We studied the nesting biology of C. flavifrons by observing 287 nests in an urban garden. Females built nests only during the dry season from September to March and exhibit notable flexibility in the amount of time each nest is active and the number of brood cells produced as a consequence. Nests were established on horizontal, sunny, sandy surfaces without vegetation. Our nest excavations revealed a main tunnel with lateral branches and an average of five cells per nest (range, 1-12 cells). The duration of a nest from digging to closure was on average 6.9 days (range of 2-19 days, n = 141) with 69 % of nests active for 2-7 days. Mesoplia regalis was observed entering the nests and emerged from the cells of C. flavifrons, but the parasitism rate was low. The implications of this flexibility in nest activity duration and brood cell number and the low pressure from parasites are discussed. [ABSTRACT FROM AUTHOR]

This study aimed to characterize the importance of the sources of floral resource used by Centris analis to provision nests in acerola orchards (the West Indian cherry, Malpighia emarginata). Thirty-six pollen types were recognized in larval provisions, of which the most frequently found were M. emarginata (76 %), Cajanus cajan (11 %), Chamaecrista type 1 (3 %), and Solanum paniculatum (3 %). The pollen-type M. emarginata was registered in 98 % of the brood cells, with monthly frequencies from 30 to 99 %. The trophic niche breadth ( H′) of the larvae of C. analis was 1.24, with monthly variations from 0.04 to 1.44. The richness of pollen types found in larval provisions of C. analis may be considered high compared to results obtained in other agrosystems with cultivated acerola. The high relative frequency of the pollen-type M. emarginata strongly affected trophic niche breadth and equitativity in the use of food resources. This crop provides floral resources (pollen and floral oils) needed by the pollinator C. analis throughout the year in the region. [ABSTRACT FROM AUTHOR]