The interactions between species resulting in evolutionary responses can be defined by how a species uses the other as a resource. Pollination is a passive process performed while flower visitors explore resources produced by the flowers. Variations in plant-pollinator interactions can be observed along the distribution of the interacting species forming a geographic mosaic in which the interaction benefits the partners in some local communities and prejudices one of them in others. This study proposes to evaluate the degree of reciprocity in the interaction between species of Krameria occurring in Brazil and oil collecting bees (Centridini) along their geographic range, based on the geographic mosaic theory of coevolution. The genus Krameria is represented in Brazil by the species K. argentea Mart. ex Spreng., K. bahiana B. Simpson, K. grandiflora A.St.-Hil., K. spartioides Klotzsch ex O.Berg and K. tomentosa A.St.-Hil. The study will follow as its starting point the distribution of K tomentosa which has been the most recorded and, apparently, the most spread occurring mainly in Atlantic Forest, Caatinga and Cerrado. Areas of Conservation and where K. tomentosa co-occurs with other species of the genus will be prioritized. In each field, three populations of K. tomentosa and its pollinators will be sampled. Variables involved in the interaction will be measured and evaluated among populations. Finding populations at different levels of reciprocal interaction along the distribution of the interacting species is expected.
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