Identifying environmental correlates of intraspecific genetic variation

K. A. Harrisson, Jian David Louey Yen, A. Pavlova, M. L. Rourke, Dean M Gilligan, Brett Ingram, Jarod Lyon, Zeb D Tonkin, Paul Sunnucks

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Genetic variation is critical to the persistence of populations and their capacity to adapt to environmental change. The distribution of genetic variation across a species' range can reveal critical information that is not necessarily represented in species occurrence or abundance patterns. We identified environmental factors associated with the amount of intraspecific, individual-based genetic variation across the range of a widespread freshwater fish species, the Murray cod Maccullochella peelii. We used two different approaches to statistically quantify the relative importance of predictor variables, allowing for nonlinear relationships: A random forest model and a Bayesian approach. The latter also accounted for population history. Both approaches identified associations between homozygosity by locus and both disturbance to the natural flow regime and mean annual flow. Homozygosity by locus was negatively associated with disturbance to the natural flow regime, suggesting that river reaches with more disturbed flow regimes may support larger, more genetically diverse populations. Our findings are consistent with the hypothesis that artificially induced perennial flows in regulated channels may provide greater and more consistent habitat and reduce the frequency of population bottlenecks that can occur frequently under the highly variable and unpredictable natural flow regime of the system. Although extensive river regulation across eastern Australia has not had an overall positive effect on Murray cod numbers over the past century, regulation may not represent the primary threat to Murray cod survival. Instead, pressures other than flow regulation may be more critical to the persistence of Murray cod (for example, reduced frequency of large floods, overfishing and chemical pollution).
Original languageEnglish
Pages (from-to)155-164
Number of pages10
JournalHeredity
Volume117
Issue number3
DOIs
Publication statusPublished - 1 Sep 2016

Cite this

Harrisson, K. A., Louey Yen, J. D., Pavlova, A., Rourke, M. L., Gilligan, D. M., Ingram, B., ... Sunnucks, P. (2016). Identifying environmental correlates of intraspecific genetic variation. Heredity, 117(3), 155-164. https://doi.org/10.1038/hdy.2016.37
Harrisson, K. A. ; Louey Yen, Jian David ; Pavlova, A. ; Rourke, M. L. ; Gilligan, Dean M ; Ingram, Brett ; Lyon, Jarod ; Tonkin, Zeb D ; Sunnucks, Paul. / Identifying environmental correlates of intraspecific genetic variation. In: Heredity. 2016 ; Vol. 117, No. 3. pp. 155-164.
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Harrisson, KA, Louey Yen, JD, Pavlova, A, Rourke, ML, Gilligan, DM, Ingram, B, Lyon, J, Tonkin, ZD & Sunnucks, P 2016, 'Identifying environmental correlates of intraspecific genetic variation' Heredity, vol. 117, no. 3, pp. 155-164. https://doi.org/10.1038/hdy.2016.37

Identifying environmental correlates of intraspecific genetic variation. / Harrisson, K. A.; Louey Yen, Jian David; Pavlova, A.; Rourke, M. L.; Gilligan, Dean M; Ingram, Brett; Lyon, Jarod; Tonkin, Zeb D; Sunnucks, Paul.

In: Heredity, Vol. 117, No. 3, 01.09.2016, p. 155-164.

Research output: Contribution to journalArticleResearchpeer-review

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Harrisson KA, Louey Yen JD, Pavlova A, Rourke ML, Gilligan DM, Ingram B et al. Identifying environmental correlates of intraspecific genetic variation. Heredity. 2016 Sep 1;117(3):155-164. https://doi.org/10.1038/hdy.2016.37