. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 390 N. H. WILLIAMS AND W. M. WHITTEN o II. Time FIGURE 3, A-C. Total ion chromatograms of the floral fragrance of an orchid and extracts of the bee that pollinates it. A. Total ion chromatogram of the fragrance of Gongora quinquenervis from El Valle de Anton, Panama. B. Total ion chromatogram of hind tibial extract of Euglossa deceptrix, the pollinator of G. quinquenervis at El Valle. C. Total ion chromatogram of the cephalic extract of the same individual bee. Note the sets of compounds shared between A and B and between B
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 390 N. H. WILLIAMS AND W. M. WHITTEN o II. Time FIGURE 3, A-C. Total ion chromatograms of the floral fragrance of an orchid and extracts of the bee that pollinates it. A. Total ion chromatogram of the fragrance of Gongora quinquenervis from El Valle de Anton, Panama. B. Total ion chromatogram of hind tibial extract of Euglossa deceptrix, the pollinator of G. quinquenervis at El Valle. C. Total ion chromatogram of the cephalic extract of the same individual bee. Note the sets of compounds shared between A and B and between B and C. See text for details. Identification of peaks: 1 = beta-ocimene; 2 = terpinolene; 3 unidentified; 4 = methylphenylace- tate; 5 = eugenol; 6 = methyl cinnamate; 7 = cis-methyl-p-methoxycinnamate; 8 = trans-methyl-p- methoxycinnamate; 9 = benzyl benzoate; 10 unidentified; 11 unidentified acetate; 12 unidentified; 13 unidentified; 14 = eicos-10-enyl-l,20-diacetate; 15 = n-nonacosene. predictor of a species' fragrance preference. One possible exception is that the few Euglossa species which lack the eicosenyl diacetate are not attracted to cineole. Figure 4 summarizes the distribution of these compounds within the male bee and diagrams our hypothesis of the fate of the floral fragrance compounds. We suspect that the fragrance compounds are absorbed into the tibial organ and are metabolized there to form the long-chain alkanes, alkenes, acetates, etc. These com- pounds would be transported via the hemolymph (possibly via sequestration) to the mandibular glands and stored in the reservoir. Obviously, experiments using radio- actively-labeled fragrance compounds will be needed to test these hypotheses. The current data can only demonstrate that the mandibular glands and the tibial organs share a common set of compounds which are often species-specific, and it still seems reasonable to suspect that the collected fragrances serve as precursors for these large Please n
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