Title
Generating Occupancy Baselines for Monitoring the Impact on Wildlife of Development Projects.
Author(s)
Wallace, Robert
Published
2017
Abstract
In Colombia, the habitat alteration due to anthropogenic causes and climate change has led to secondary contact between species of Birds, such as Ramphocelus icteronotus, species that extended its distributional range (Chocó biogeographic) to the northeastern of the country, being found in sympatry with R. dimidiatus, resident species in this region. A possible consequence of this coexistence is the loss of genetic variability in the local species because hybridization could occur between both species. According to the above approach, the objective of this work was to evaluate the diversity and the degree of genetic structure, from the analysis of genotypes given by heterologous microsatellites markers and ND2 gene sequences, in sympatric populations of R. dimidiatus and R. icteronotus present in agroecosystems zones in Santander department. It was found that the genetic, haplotypic and nucleotide diversity in R. dimidiatus was higher (He=0,881±0,065, h=0,895±0,026 and ?=0,0048±0,003, respectively) than R. icteronotus (He=0,807±0,083, h=0,890±0,035 and ?=0,0026±0,002), species where 10 ND2 haplotypes were characterized in contrast to the 19 found in R. dimidiatus. The degree of genetic differentiation between the two species is high, corroborated by the RST=0,1969 and ST=0,9421 indices, as well as a Bayesian analysis under the mixing model, which showed two different genetic bases (K=2; K=157.82). The neutrality indices D (Tajima) and Fs (Fu) reflect a recent population expansion of R. icteronotus. Based on genetic diversity indices, it can be concluded that the genetic diversity of R. dimidiatus is high, suggesting that it doesn’t require the assignment of conservation status despite the sympatry with R. icteronotus, however, actions aimed to preserve the agroecosystems integrity would be required, due to the haplotypic richness detected in both species.
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PUB26878