Data from: Trapped within the city: Integrating demography, time since isolation and population-specific traits to assess the genetic effects of urbanization
Lourenço, André, University of California, Berkeley
Álvarez, David, University of Oviedo
Wang, Ian J., University of California System
Velo-Antón, Guillermo, CIBIO/InBIO; Centro de Investigação em Biodiversidade e Recursos Genéticos da Universidade do Porto; Instituto de Ciências Agrárias de Vairão; Rua Padre Armando Quintas 7 4485-661 Vairão Portugal
Published Jan 13, 2017 on Dryad.
Cite this dataset
Lourenço, André; Álvarez, David; Wang, Ian J.; Velo-Antón, Guillermo (2017). Data from: Trapped within the city: Integrating demography, time since isolation and population-specific traits to assess the genetic effects of urbanization [Dataset]. Dryad. https://doi.org/10.5061/dryad.44894
Urbanization is a severe form of habitat fragmentation that can cause many species to be locally extirpated and many others to become trapped and isolated within an urban matrix. The role of drift in reducing genetic diversity and increasing genetic differentiation is well recognized in urban populations. However, explicit incorporation and analysis of the demographic and temporal factors promoting drift in urban environments are poorly studied. Here, we genotyped 15 microsatellites in 320 fire salamanders from the historical city of Oviedo (Est. 8th century) to assess the effects of time since isolation, demographic history (historical effective population size; Ne) and patch size on genetic diversity, population structure and contemporary Ne. Our results indicate that urban populations of fire salamanders are highly differentiated, most likely due to the recent Ne declines, as calculated in coalescence analyses, concomitant with the urban development of Oviedo. However, urbanization only caused a small loss of genetic diversity. Regression modelling showed that patch size was positively associated with contemporary Ne, while we found only moderate support for the effects of demographic history when excluding populations with unresolved history. This highlights the interplay between different factors in determining current genetic diversity and structure. Overall, the results of our study on urban populations of fire salamanders provide some of the very first insights into the mechanisms affecting changes in genetic diversity and population differentiation via drift in urban environments, a crucial subject in a world where increasing urbanization is forecasted.
Dataset containing genotypes of 15 microsatellite loci genotyped in 16 populations of Salamandra salamandra in Oviedo.