Distribution modeling and conservation status of Lockhartia (Orchidaceae) species occurring in Brazil
database, conservation, niche modeling, orchids, Oncidiinae
The family Orchidaceae has economic and ornamental importance, and is distributed in five subfamilies: Apostasioideae, Cypripedeoideae, Orchidoideae, Vanilloideae and Epidendroideae. The latter is divided into 14 tribes, especially Cymbidieae, which encompasses 11 subtribes, including Oncidiinae, one of the largest subtribes of the family. The genus Lockhartia Hook, inserted in Oncidiinae, is neotropical and is represented by 39 epiphytic species, characterized by pseudomonopodial and equitable growth, in addition to trilobed and yellow flowers. Lockhartia species are easily recognized in the field when in a vegetative stage, but identification at a specific level requires floral analysis. In Brazil, the genus is represented by six species, with the highest number of species reported for the Amazon (4 spp.). However, specifically for this phytogeographic domain, taxonomic, ecological and geographic distribution information on Lockhartia is scarce and sparse. In this context, ecological niche modeling is promising, as it allows to explain and predict observed biogeographic patterns, constituting an especially useful tool in the elaboration of conservation strategies for rare or endangered species. The objective of this study is to evaluate the conservation status and predict the geographic distribution of Lockhartia species occurring in Brazil. Currently, there are 880 exsiccates of Lockhartia deposited in herbaria around the world, of which 455 come from the Brazilian Amazon and 78 from the state of Pará.