title: Genetic diversity and relatedness within and between species of the genus Oligoryzomys (Rodentia; Sigmodontinae).
abstract: A RAPD analysis on six species of the rodent genus Oligoryzomys trapped in a wide area (ranging from 01 degrees N to 32 degrees S) of Brazilian territory was performed in order to determine the levels of genetic variability within and between its populations and species. One-hundred and ninety-three animals were collected in 13 different sites (corresponding to 17 samples) located at Pampas, Atlantic Rain Forest, Cerrado, and Amazon domains. Oligoryzomys sp., O. nigripes (8 populations), O. flavescens (4 populations), O. moojeni, O. stramineus, and O. fornesi were the taxa analyzed. Of the 20 primers tested, 4 generated a total of 75 polymorphic products simultaneously amplified in 151 specimens. Various diversity estimators analyzed showed considerable differences between species and populations, indicating a great genetic variation occurring in the Oligoryzomys taxa investigated. A cluster analysis was made using Nei's standard genetic distances, however, it did not correlate the genetic heterogeneity of the species and populations with the geographical areas.
authors.affiliation: Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Trott
authors.forename: S M
authors.initials: SM
authors.lastname: Callegari-Jacques
authors.forename: L F B
authors.initials: LF
authors.lastname: Oliveira
authors.forename: A
authors.initials: A
authors.lastname: Langguth
authors.forename: M S
authors.initials: MS
authors.lastname: Mattevi
mesh_terms: D000818:Animals; D005787:Gene Frequency / Q000235:genetics; D005819:Genetic Markers; D014644:Genetic Variation; D005828:Genetics, Population; D015345:Oligonucleotide Probes; D019105:Random Amplified Polymorphic DNA Technique; D016205:Sigmodontinae / Q000145:classification / Q000235:genetics*
chemical_list: D005819:Genetic Markers; D015345:Oligonucleotide Probes