From mountaintops to metacollections: using genomics to evaluate ex situ conservation collections. A case study from tropical montane cloud forest plants in Australia
- 1Research Centre for Ecosystem Resilience, Botanic Gardens of Sydney, NSW 2000, Australia
Abstract
A core aim of ex situ conservation is to represent wild genetic diversity in managed living collections. For the climate-threatened tropical montane cloud forest (TMCF) flora of northeast Australia, an ex situ metacollection of plants and seeds has been established by the Tropical Mountain Plant Science (TroMPS) project. In this study we used reduced-representation sequencing (DArTseq) of wild, herbarium, and ex situ material alongside provenance information for ten species, to pursue two central aims: to characterise landscape-scale genetic structure across species' ranges, and to evaluate how well the assembled metacollections represent that wild diversity. Analyses revealed consistent patterns of genetic differentiation among mountain top populations across multiple species, reflecting the isolating influence of lowland gaps between upland habitats, with the degree of differentiation varying among species. These results provide the first genetic baseline for Australian TMCF flora and reinforce the importance of treating individual mountain top populations as distinct units for conservation management. Additionally, the project provided valuable insights into the logistical challenges of coordinated multi-institutional collecting, informing strategies for metacollection design more broadly. Evaluation of the metacollection revealed both strengths and gaps in representation across species, providing evidence to refine the current holdings and guide future targeted collecting to strengthen their long-term conservation value.
Related
- Genotype-by-sequencing of global hyacinth bean (Lablab purpureus) collections provides genomic resources for crop conservation and improvement
- Development of a conceptual apparatus in the field of establishment, formation, conservation, development, studying, and utilization of plant genetic resources collections
- Genome assembly of Eucalyptus recurva provides insights into inbreeding and conservation priorities in Australia's rarest Eucalyptus
- Is It a “Hybrid Swarm”? Opportunities for More Informative Terminology in Conservation Genomics
- Endemic but not eroded: Genomic distinctiveness and conservation genomics of the British swallowtail butterfly ( Papilio machaon britannicus )
BibTeX
@misc{cascini2026from,
title = {{From mountaintops to metacollections: using genomics to evaluate ex situ conservation collections. A case study from tropical montane cloud forest plants in Australia}},
author = {M. Cascini and L. Simpson and S. Worboys and W. Worboys and L. Guja and Z. Knapp and P. Bredell and J. Percival and M. Rossetto and D. Crayn},
howpublished = {bioRxiv},
year = {2026},
month = jun,
doi = {10.64898/2026.06.27.734930},
url = {https://www.biorxiv.org/content/10.64898/2026.06.27.734930v2},
note = {CC BY-NC},
}
RIS
TY - UNPB
TI - From mountaintops to metacollections: using genomics to evaluate ex situ conservation collections. A case study from tropical montane cloud forest plants in Australia
AU - M. Cascini
AU - L. Simpson
AU - S. Worboys
AU - W. Worboys
AU - L. Guja
AU - Z. Knapp
AU - P. Bredell
AU - J. Percival
AU - M. Rossetto
AU - D. Crayn
PY - 2026
DA - 2026/06/27
PB - bioRxiv
DO - 10.64898/2026.06.27.734930
UR - https://www.biorxiv.org/content/10.64898/2026.06.27.734930v2
AB - A core aim of ex situ conservation is to represent wild genetic diversity in managed living collections. For the climate-threatened tropical montane cloud forest (TMCF) flora of northeast Australia, an ex situ metacollection of plants and seeds has been established by the Tropical Mountain Plant Science (TroMPS) project. In this study we used reduced-representation sequencing (DArTseq) of wild, herbarium, and ex situ material alongside provenance information for ten species, to pursue two central aims: to characterise landscape-scale genetic structure across species' ranges, and to evaluate how well the assembled metacollections represent that wild diversity. Analyses revealed consistent patterns of genetic differentiation among mountain top populations across multiple species, reflecting the isolating influence of lowland gaps between upland habitats, with the degree of differentiation varying among species. These results provide the first genetic baseline for Australian TMCF flora and reinforce the importance of treating individual mountain top populations as distinct units for conservation management. Additionally, the project provided valuable insights into the logistical challenges of coordinated multi-institutional collecting, informing strategies for metacollection design more broadly. Evaluation of the metacollection revealed both strengths and gaps in representation across species, providing evidence to refine the current holdings and guide future targeted collecting to strengthen their long-term conservation value.
ER -