Low adaptive and neutral genetic diversity in the endangered Antioquia wren ( Thryophilus sernai )

摘要: Determining the amount and distribution of genetic variation represents a fundamental step for inference evolutionary processes acting on populations endangered species. For these species, adaptive potential is highly reduced by loss due to drift. Here, we examined diversity at mitochondrial control region (CR), 17 microsatellites, six Toll-like receptor (TLR) genes, known play key role innate immune response vertebrates in Antioquia wren (AW) Thryophilus sernai, an passerine bird inhabiting remnant fragments tropical dry forest northernmost part Cauca river canyon, Colombia. We found very low three types markers. The CR showed scarce variability, while only microsatellites analyzed two TLRs sequenced were polymorphic. Population structure analyses suggest occurrence one single population area. Selection tests could not detect signatures positive selection variable sites assessment amino acid changes within lineage do any functional effects that be associated either polymorphic TLR loci. Comparisons with species showing widespread restricted supports variability typical small populations. These results current as its expected increase extinction risk limiting ability cope environmental changes. Our study evidence suggesting drift main driver shaping variation.