Figure 1:
Geographical location of sampling sites in the main cotton-producing region of Brazil, in the municipalities of Barreiras, in the state of Bahia (BA); Primavera do Leste and Rondonópolis, in the state Mato Grosso (MT); and in Brasília, in Distrito Federal (DF).
Figure 2:
Rank-abundance pattern of the bee assemblages sampled on cotton (Gossypium hirsutum var. latifolium) flowers, based on data sets from different years and sites in the Central-West region of Brazil. DF, Distrito Federal; BA, Bahia; MT, Mato Grosso; and CNPH, Embrapa Hortaliças.
Figure 3:
Species accumulation curves for wild bees collected on cotton (Gossypium hirsutum var. latifolium) flowers in different localities of Central-West regions of Brazil, from 2003 to 2006: BA, Bahia; DF, Distrito Federal; and MT, Mato Grosso. A, data set with the rare species; B, data set without the rare species.
Figure 4:
The first two principal component axes of the bee assemblages on cotton (Gossypium hirsutum var. latifolium) flowers, in all site-years sampled in Central-West Brazil. Site-years (S): S1, DF-Coperbrás/2003; S2, DF-Coperbrás/2004; S3, DF-Coperbrás/2005; S4, DF-CNPH/2005; S5, DF-CNPH/2006; S6, MT-Rondonópolis/2005; S7, MT-Primavera do Leste/2005; and S8, BA-Barreiras/2005; in which DF, MT, and BA refer to Distrito Federal, Mato Grosso, and Bahia, respectively, and CNPH refers to Embrapa Hortaliças. The site-years S2, S3, S7, and S8 received insecticides. Bee species are indicated by letters: A, Alepidosceles cfr. imitatrix; B, Apis mellifera; C, Ceratina (Crewella) cfr. gossypii; D, Exomalopsis (Exomalopsis) analis; E, Exomalopsis (Exomalopsis) sp. 1; F, Geotrigona mombuca; G, Melissodes (Ecplectica) nigroaenea; H, Melissoptila cnecomola; I, Melissoptila cfr. pubescens; J, Paratrigona lineata; L, Partamona cupira; M, Partamona mulata; N, Ptilothrix cfr. plumata; O, Trigona spinipes; P, Augochlora (Oxystoglossella) thalia; Q, Augochloropsis patens; and R, Lithurgus (Lithurgus) huberi.
Figure 5:
Expected number of correct determinations of the three most common wild bee species on cotton (Gossypium hirsutum var. latifolium) flowers, among the abundant species in random samples over all possible combinations of one, two or three site-years. The expected number was calculated for the 3, 4, 5, and 6 most abundant species in a sample. A, site-years that did not receive insecticides; and B, site-years that received insecticides.
Figure 6:
Natural log of the ratio between the expected number of common wild bee species correctly determined and the number incorrectly determined. A, site-years that did not receive insecticides; and B, site-years that did receive insecticides.
Figure 7:
Species accumulation curves for rare bee species collected on cotton (Gossypium hirsutum var. latifolium) flowers in sites that received insecticide applications and in insecticide-free sites, or in both combined. Rare species, species represented by fewer than five specimens in the entire sample from eight sites.