Colonisation pathways, genetic diversity and evolutionary potential of a non-native lizard

Studying biological invasions may further our understanding of how ecological and evolutionary processes  shape  patterns  of  diversity within  species  and  communities.  The ability of non-native species to persist and adapt to new environments is expected to rely on their genetic diversity. To understand what shapes their genetic structure we first need to have a detailed knowledge of their colonization history. In this study, we used Bayesian clustering, approximate Bayesian computation methods and network analyses to reconstruct the origin and colonization pathways of 23 populations of the wall lizard Podarcis muralis in England. We then inferred how genetic diversity is affected by the origin(s) and admixture of distinct genotypic lineages. Our analyses show that established populations in southern England originate from at least nine separate sources from native populations in France and Italy with substantial admixture of native lineages. Genetic diversity was significantly lower in the non-native populations and the loss of genetic diversity was also accompanied by increased hatching failure. However, populations introduced as recently as 25 years ago show evidence of having adapted to the cooler climatic conditions in the UK. This study thus demonstrates the importance of understanding colonization history for understanding the persistence and adaptation of non-native species.

Species on the Move

An International Conference Series

The conference brings together scientists and natural resource managers working in the disciplines of global change, biogeography and evolution, and relevant in contexts of natural resource management, biodiversity management and conservation, and theoretical ecology.

Species responses to climate change is a rapidly evolving research field, however, much of our progress is being made in independent research areas: e.g. understanding the process vs responding to the implications, terrestrial vs marine ecosystems, global meta-analyses vs in depth species-specific approaches. This interdisciplinary conference develops connections between these parallel streams, and across temporal and spatial scales.

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