title: Genetic structure of tree and shrubby species among anthropogenic edges, natural edges, and interior of an atlantic forest fragment.
abstract: Two species, Psychotria tenuinervis (shrub, Rubiaceae) and Guarea guidonia (tree, Meliaceae), were used as models to compare the genetic structure of tree and shrubby species among natural edges, anthropogenic edges, and a fragment interior. There were significant differences between two genetic markers. For isozymes, P. tenuinervis presented greater heterozygosity (expected and observed) and a higher percentage of polymorphic loci and median number of alleles than G. guidonia. For microsatellites, there was no difference in genetic variability between the species. Only P. tenuinervis, for isozymes, showed differences in genetic variability among the three habitats. There was no genetic structure (F (ST) < 0.05) among habitats in both plant species for both genetic markers. Isozymes showed great endogamy for both plant species, but not microsatellites. The forest fragmentation may have negative effects on both spatial (among edges and interior) and temporal genetic variability.
authors: Departamento de Ciências Biológicas e da Terra, Universidade Federal de Alfenas, Rua Gabriel Monteiro da Silva, 714 Centro, 37130-000 Alfenas, MG, Brazil. fnramos@gmail.com
authors: Flavio Nunes
authors: FN
authors: Ramos
authors: Paula Feliciano
authors: PF
authors: de Lima
authors: Maria Imaculada
authors: MI
authors: Zucchi
authors: Carlos Augusto
authors: CA
authors: Colombo
authors: Vera Nisaka
authors: VN
authors: Solferini
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D003247:Conservation of Natural Resources; D017753:Ecosystem; D005819:Genetic Markers / Q000235:genetics; D040342:Genetic Structures / Q000502:physiology; D005843:Geography; D029582:Meliaceae / Q000235:genetics; D018895:Microsatellite Repeats / Q000235:genetics; D008954:Models, Biological; D010944:Plants / Q000033:anatomy & histology* / Q000235:genetics*; D032069:Psychotria / Q000235:genetics; D013045:Species Specificity; D014197:Trees / Q000033:anatomy & histology* / Q000235:genetics*
chemical_list: D005819:Genetic Markers