Mechanisms of genetic differentiation among populations in vagile species

Anicee J Lombal, James E O'dwyer, Vicki Friesen, Eric J Woehler, Christopher P Burridge

Overview

Elucidating the factors underlying the origin and maintenance of genetic variation among populations is crucial for our understanding of their ecology and evolution, and also to help identify conservation priorities. While intrinsic movement has been hypothesized as the major determinant of population genetic structuring in abundant vagile species, growing evidence indicates that vagility does not always predict genetic differentiation. This exhaustive review of the theoretical and empirical literature investigates the determinants of population genetic differentiation using seabirds as a model system for vagile taxa. In light of our results, we recommend that genetic studies should consider potential historical events when identifying determinants of genetic differentiation among populations to avoid overestimating the role of contemporary factors.

Summary

Our study provides an insight into the underlying mechanisms of population genetic differentiation in highly mobile species and corroborates previous studies indicating that movement capacities are not always good predictors.

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Author Comments

Dr Anicee Lombal, PhD
Dr Anicee Lombal, PhD
University of Tasmania
Ph.D
Hobart, Tasmania | Australia
Correlations between genetic structure, historical and abiotic processes and phenotypic variation observed in this study for a large group of vagile predators should be investigated using other types of mobile organisms as they can inform the origin and maintenance of genetic barriers among populations and species.Dr Anicee Lombal, PhD

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Identifying mechanisms of genetic differentiation among populations in vagile species: historical factors dominate genetic differentiation in seabirds.

Authors:
Dr Anicee Lombal, PhD
Dr Anicee Lombal, PhD
University of Tasmania
Ph.D
Hobart, Tasmania | Australia

Biol Rev Camb Philos Soc 2020 Feb 5. Epub 2020 Feb 5.

Discipline of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia.

Elucidating the factors underlying the origin and maintenance of genetic variation among populations is crucial for our understanding of their ecology and evolution, and also to help identify conservation priorities. While intrinsic movement has been hypothesized as the major determinant of population genetic structuring in abundant vagile species, growing evidence indicates that vagility does not always predict genetic differentiation. However, identifying the determinants of genetic structuring can be challenging, and these are largely unknown for most vagile species. Although, in principle, levels of gene flow can be inferred from neutral allele frequency divergence among populations, underlying assumptions may be unrealistic. Moreover, molecular studies have suggested that contemporary gene flow has often not overridden historical influences on population genetic structure, which indicates potential inadequacies of any interpretations that fail to consider the influence of history in shaping that structure. This exhaustive review of the theoretical and empirical literature investigates the determinants of population genetic differentiation using seabirds as a model system for vagile taxa. Seabirds provide a tractable group within which to identify the determinants of genetic differentiation, given their widespread distribution in marine habitats and an abundance of ecological and genetic studies conducted on this group. Herein we evaluate mitochondrial DNA (mtDNA) variation in 73 seabird species. Lack of mutation-drift equilibrium observed in 19% of species coincided with lower estimates of genetic differentiation, suggesting that dynamic demographic histories can often lead to erroneous interpretations of contemporary gene flow, even in vagile species. Presence of land across the species sampling range, or sampling of breeding colonies representing ice-free Pleistocene refuge zones, appear to be associated with genetic differentiation in Tropical and Southern Temperate species, respectively, indicating that long-term barriers and persistence of populations are important for their genetic structuring. Conversely, biotic factors commonly considered to influence population genetic structure, such as spatial segregation during foraging, were inconsistently associated with population genetic differentiation. In light of these results, we recommend that genetic studies should consider potential historical events when identifying determinants of genetic differentiation among populations to avoid overestimating the role of contemporary factors, even for highly vagile taxa.

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Source
http://dx.doi.org/10.1111/brv.12580DOI Listing
February 2020

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References

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