Euglossini
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Aglae |
Euglossine bees, also called orchid bees, are the only group of corbiculate bees whose non-parasitic members do not all possess eusocial behavior. Most of the species are solitary, though a few are communal, or exhibit simple forms of eusociality. There are about 200 described species, distributed in five genera: Euglossa, Eulaema, Eufriesea, Exaerete and Aglae, all exclusively occurring in South or Central America. The latter two genera are cleptoparasites in the nests of other orchid bees.
Male orchid bees have uniquely modified legs which are used to collect and store different volatile compounds throughout their lives, primarily from orchids (which do not supply pollen or nectar), and these chemicals are evidently exposed by the males at their display sites in the forest understory, where matings are known to take place. Although the accumulated volatiles may serve as a signal to females, female attraction or an effect on male mating success has never been demonstrated. The behavior is essentially unique in the animal kingdom.
Neotropical orchids themselves often exhibit elaborate adaptations involving highly specific placement of pollen packets (pollinia) on the bodies of the male orchid bees; the specificity of their placement ensures that cross-pollination only occurs between orchids of the same species. Different orchid bee males are attracted to different chemicals, so there is also some specificity regarding which orchid bees visit which types of orchid. The early description of this pollination system was by Charles Darwin, though at the time, he believed the bees were females. Not all orchids utilize euglossines as pollen vectors, of course; among the other types of insects exploited are other types of bees, wasps, flies, ants, and moths.
[edit] References
- The Various Contrivances by which Orchids are Fertilized by Insects, Charles Darwin, D. Appleton, 1877.
- D. W. Roubik and P. E. Hanson (2004) Orchid bees of tropical America: biology and field guide.
- Engel, M.S. (1999) The first fossil Euglossa and phylogeny of the orchid bees (Hymenoptera: Apidae; Euglossini). American Museum Novitates 3272: 1-14.
