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Lettoof DC, Thomson VA, Cornelis J, et al. Bioindicator snake shows genomic signatures of natural and anthropogenic barriers to gene flow. PLoS One. 2021;16(10):e0259124doi: 10.1371/journal.pone.0259124.
Lettoof, D. C., Thomson, V. A., Cornelis, J., Bateman, P. W., Aubret, F., Gagnon, M. M., & von Takach, B. (2021). Bioindicator snake shows genomic signatures of natural and anthropogenic barriers to gene flow. PloS one, 16(10), e0259124. https://doi.org/10.1371/journal.pone.0259124
Lettoof, Damian C, et al. "Bioindicator snake shows genomic signatures of natural and anthropogenic barriers to gene flow." PloS one vol. 16,10 (2021): e0259124. doi: https://doi.org/10.1371/journal.pone.0259124
Lettoof DC, Thomson VA, Cornelis J, Bateman PW, Aubret F, Gagnon MM, von Takach B. Bioindicator snake shows genomic signatures of natural and anthropogenic barriers to gene flow. PLoS One. 2021 Oct 29;16(10):e0259124. doi: 10.1371/journal.pone.0259124. eCollection 2021. PMID: 34714831; PMCID: PMC8555784.
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PLoS One. 2021 Oct 29;16(10):e0259124. doi: 10.1371/journal.pone.0259124. eCollection 2021.

Bioindicator snake shows genomic signatures of natural and anthropogenic barriers to gene flow.

PloS one

Damian C Lettoof, Vicki A Thomson, Jari Cornelis, Philip W Bateman, Fabien Aubret, Marthe M Gagnon, Brenton von Takach

Affiliations

  1. Behavioural Ecology Lab, School of Molecular and Life Sciences, Curtin University, Bentley, Western Australia, Australia.
  2. School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia.
  3. Station d'Ecologie Théorique et Expérimentale, CNRS, Moulis, France.
  4. School of Molecular and Life Sciences, Curtin University, Bentley, Western Australia, Australia.
  5. Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia.

PMID: 34714831 PMCID: PMC8555784 DOI: 10.1371/journal.pone.0259124

Abstract

Urbanisation alters landscapes, introduces wildlife to novel stressors, and fragments habitats into remnant 'islands'. Within these islands, isolated wildlife populations can experience genetic drift and subsequently suffer from inbreeding depression and reduced adaptive potential. The Western tiger snake (Notechis scutatus occidentalis) is a predator of wetlands in the Swan Coastal Plain, a unique bioregion that has suffered substantial degradation through the development of the city of Perth, Western Australia. Within the urban matrix, tiger snakes now only persist in a handful of wetlands where they are known to bioaccumulate a suite of contaminants, and have recently been suggested as a relevant bioindicator of ecosystem health. Here, we used genome-wide single nucleotide polymorphism (SNP) data to explore the contemporary population genomics of seven tiger snake populations across the urban matrix. Specifically, we used population genomic structure and diversity, effective population sizes (Ne), and heterozygosity-fitness correlations to assess fitness of each population with respect to urbanisation. We found that population genomic structure was strongest across the northern and southern sides of a major river system, with the northern cluster of populations exhibiting lower heterozygosities than the southern cluster, likely due to a lack of historical gene flow. We also observed an increasing signal of inbreeding and genetic drift with increasing geographic isolation due to urbanisation. Effective population sizes (Ne) at most sites were small (< 100), with Ne appearing to reflect the area of available habitat rather than the degree of adjacent urbanisation. This suggests that ecosystem management and restoration may be the best method to buffer the further loss of genetic diversity in urban wetlands. If tiger snake populations continue to decline in urban areas, our results provide a baseline measure of genomic diversity, as well as highlighting which 'islands' of habitat are most in need of management and protection.

Conflict of interest statement

No authors have competing interests.

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