Molecular characterization of the spectacled caiman (Caiman crocodilus) in the upper Magdalena River basin, Colombia: Demographic and phylogeographic insights

dc.creatorD?az-Moreno, Diana M.
dc.creatorHern?ndez-Gonzalez, Felipe
dc.creatorMoncada-Jimenez, Juan F.
dc.creatorMora, Cristina
dc.creatorPrada, Carlos
dc.creatorJim?nez-Alonso, Gonzalo
dc.creatorBalaguera-Reina, Sergio A.
dc.date2022-08-30T22:01:40Z
dc.date2022-08-30T22:01:40Z
dc.date2021-09-10
dc.date.accessioned2023-08-31T19:24:19Z
dc.date.available2023-08-31T19:24:19Z
dc.identifierDiana M. D?az-Moreno, Felipe Hern?ndez-Gonzalez, Juan F. Moncada-Jimenez, Cristina Mora, Carlos Prada, Gonzalo Jim?nez-Alonso & Sergio A. Balaguera-Reina (2021) Molecular characterization of the spectacled caiman (Caiman crocodilus) in the upper Magdalena
dc.identifier1477-2000
dc.identifierhttps://www.tandfonline.com/doi/citedby/10.1080/14772000.2021.1968975?scroll=top&needAccess=true
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8557976
dc.descriptionMaintenance of high levels of genetic diversity is crucial for the recovery of overexploited species and gaining knowledge of genetic diversity of natural populations is crucial to define effective conservation strategies. Spectacled caimans (Caiman crocodilus) were unsustainably exploited for decades in Colombia causing drastic population reductions with unknown effects on genetic structure. We molecularly characterized three spectacled caiman populations from the upper Magdalena River basin (UMRB), analyzing them within the context of the trans-Andean C. c. fuscus sensu stricto lineage, assessing nucleotide and genetic diversity, demographic history, and phylogeography at different scales. Seventeen of the 23 mitochondrial haplotypes currently described for Colombia are present in the UMRB, showing high levels of genetic diversity even when compared with the trans-Andean region (uncorrected genetic distances 0.00-0.87%). Mutational steps between closest haplotypes ranged from one to four while the most differentiated haplotypes were separated by 19 mutational steps across the whole trans-Andean region. Distribution of pairwise nucleotide differences and raggedness tests showed unimodal patterns of mismatch distribution curves fitting the sudden expansion model. Average time since demographic expansion for UMRB, Colombia, and trans-Andean region were inferred as 10,540, 7,591, and 7,071?years before present, respectively, placing the latest expansion close to the Pleistocene-Holocene boundary. Intriguingly, samples from Tolima were overall more related to those collected from Panama and Costa Rica (0.34???0.15%) than the ones collected across Choco (0.45???0.15%), Cauca (0.70???0.09%), and Nari?o (0.60???0.14%) departments. We discuss our genetic findings in the context of the management policies carried out in the country during the last decades (unsustainable and sustainable use, and population restocking), evaluating the implications of these events for the genetic integrity and conservation of the species.
dc.descriptionUniversidad de Ibagu?
dc.languageen
dc.publisherSystematics and Biodiversity
dc.subjectConservation genetics
dc.subjectCrocodylia
dc.subjectGenetic lineages
dc.subjectGenetic variability
dc.subjectTolima
dc.subjectWildlife management
dc.titleMolecular characterization of the spectacled caiman (Caiman crocodilus) in the upper Magdalena River basin, Colombia: Demographic and phylogeographic insights
dc.typeArticle


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