Differential pollination modes between distant populations of Unonopsis guatterioides (Annonaceae) in Minas Gerais and Amazonas, Brazil

摘要: Abstract Differentiation in angiosperms is often linked to small changes floral features including morphology, but also phenology and resources, which select different arrays of pollinators result disassortative mating. Unonopsis a bee-pollinated genus the mostly beetle-pollinated tropical family Annonaceae. We studied guatterioides , species widespread South American forests, from Amazon Sao Paulo. A population Uberlândia, Minas Gerais state, Central Brazil was investigated for its biology, anthesis, scent, pollinator behavior, breeding system. The plants Uberlândia were self-compatible. Its flowers protogynous, their anthesis lasted 30 h. Pistillate staminate stage mainly released monoterpenoids, among them 1,8-cineole limonene. comparison with previously U. Amazonas state indicated remarkable differences between two populations, regard flower characters, pollination process. There more diverse, unspecialized by several Halictidae Apidae bee while Manaus there highly specialized perfume-collecting males single orchid species, Eulaema bombiformis (Apidae-Euglossini). profound biology indicate that these populations eventually represent species.