Assessing plant translocation success: common metrics mask high levels of inbreeding in a recently established Banksia brownii (Proteaceae) population
Rebecca Dillon
A B * , David Coates A C , Rachel Standish D , Leonie Monks A D and Michelle Waycott B
+ Author Affiliations
- Author Affiliations
A Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, Bentley, WA 6983, Australia.
B School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.
C School of Biology, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.
D Environmental and Conservation Sciences, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia.
Australian Journal of Botany 71(2) 79-92 https://doi.org/10.1071/BT22071
Submitted: 5 July 2022 Accepted: 7 February 2023 Published: 17 March 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: As threatening processes continue to impact rare plant populations, the use of translocations is becoming increasingly frequent. The ultimate success of translocation, attaining long-term persistence, is determined by species’ ability to reproduce, recruit, and maintain levels of genetic diversity that permits the capacity to adapt to environmental change.
Aims: This study aimed to assess translocation success of Banksia brownii.
Methods: We compared genetic diversity, reproductive output and aspects of the mating system of a translocated population with four reference wild populations.
Key results: We found that the use of multiple source populations for the translocation resulted in levels of genetic diversity comparable to reference populations of high diversity. Reproductive output was highest in the translocated population and a positive relationship between plant size and number of flowers across all populations was evident. However, mating system analysis revealed a large difference in outcrossing rates between populations in different habitats despite common pollinators, with the translocated population having the highest rates of selfing.
Conclusion: Whilst genetic diversity and reproductive output were comparable or higher in the translocated population than in the reference populations, assessing translocation outcomes by these measures alone can potentially mask the longer-term erosion of genetic diversity through unfavourable patterns of mating.
Implications: We recommend using multiple metrics of reproductive, recruitment and genetic diversity to properly assess plant translocation success.
Keywords: Banksia, genetic diversity, mating systems, pollination, reintroduction, reproductive output, threatened plant, translocation, Western Australia.
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