It has been established for some time that fragrance components of many orchids playa primary role in attracting male euglossine bees (Dodson, 1962; Dodson et al., 1969; Dressler, 1967, 1968a, 1968b; Vogel, 1963: Williams and Dodson 1972). Fragrances in some orchids are known to be more important than visual cues for pollinator attraction, especially over long distances. Some ofthe components serve to attract pollinators, while others apparently either modify the attracting fragrance or behave as repellents. Since several orchids are known to possess only one or a few pollinators, it has been suggested that unique fragrances attract specific pollinators. The fragrance components of known euglossine-pollinated orchids are mostly terpenoids and aromatic compounds.
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