Intraspecific Genetic dynamics under Climate Change: A Travel to the Late Quaternary

Alexander Florez Rodriguez

Abstract

Climate change has a deep influence on the maintenance and generation of global biodiversity. Past contractions, expansions and shifts in species’ ranges drove to changes in species genetic diversity. Noteworthy, the interaction among: climate change, range, population size and extinction is often synergetic and takes place at broad spatial and temporal scales, which obscures our understanding of climate-driven extinction dynamics. In my thesis I explore the patterns of intraspecific genetic diversity and population structure of a large set of mammals with significant variation in life history traits across large spatial scales and over long-term climatic changes. I have found that in overall species’ populations are genetically less diverse than they were during the Late Pleistocene, and also that the rapidity of climate change plays an important role in the changes in intraspecific genetic diversity. Lastly, connectivity of species has changed during the last 50,000 years, evidencing changes in the genetic structure of Holarctic mammals during the Late Quaternary. This thesis provides an exploration of past population dynamics in species subjected to rapid climate change, combined with an important ‘baseline’ of present patterns of genetic diversity, laying the groundwork needed to predict the impacts of future climate change on global genetic and biodiversity

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