Genetics in threatened plant management: the diversity, morphology and habitat of northern North Island ewekuri (Streblus banksii).
- Author
- Mackenzie, L.J.
- Year
- 2023
- Journal / Source
- Unpublished MSc
- Publisher / Organisation
- University of Auckland
- Pages
- 96 pp
- Keywords
- Kuoatunu Beach
- Summary
- One of the greatest unresolved concerns in plant conservation is the genetic management of fragmented populations and threatened species. Although increasingly popular as a tool for ecological management, little is known of how to best utilise population genetics within conservation. Recently, a need to balance ecosourcing practices and maximise genetic diversity within conservation management has arisen. Streblus banksii (known as ewekuri or the large-leaved milk tree) is a poorly-studied endemic tree species considered ‘At Risk’ in Aotearoa New Zealand, and reestablishing populations in appropriate habitats could improve the species’ conservation status. Ewekuri was common across much of northern Aotearoa prior to human arrival, and has declined due to deforestation and herbivory by rat (Rattus) species. Ewekuri also may be threatened by genetic swamping due to suggested hybridization between it and a close relative, tūrepo (Streblus heterophyllus). The aims of this study were to determine the genetic, morphological and demographic variation of ewekuri, putative hybrids and tūrepo across the wider Tāmaki Makaurau region then use the resulting genetic structure and associated community composition to advise conservation efforts and suggest avenues of further research.