Significant Residual Impact criteria
Assessment
the proposed Impact Mitigation Management Plan for Grevillea hockingsii , it is probable that harvested and propagated plants from the impacted population will be planted into the Mount Morgan population, thus mitigating some of the fragmentation. Additionally, through aiming for a net positive outcome, the Mount Morgan population size may be increased. As such, the project is considered unlikely to fragment an existing population. Across the Mount Morgan area, G. hockingsii is likely to have been historically cleared and the larger population fragmented with the establishment of the town of Mount Morgan and the Mount Morgan Mine. All 67 individuals within the project area will require clearing as part of the proposed works. As such, the Project will likely increase isolation experienced across the Mount Morgan population of G. hockingsii . However, through the implementation of the proposed Impact Mitigation Management Plan for Grevillea hockingsii , it is probable that harvested and propagated plants from the impacted population will be planted into the Mount Morgan population, thus mitigating some of the isolation. Additionally, Grevillea species are commonly pollinated by a variety of animals including birds, insects and mammals, with nectivorous birds historically observed feeding at the flowers of G. hockingsii. Given that many of the above pollination vectors are likely to be able to traverse the surrounding landscape, the project is considered unlikely to result in genetically distinct populations forming as a result of habitat isolation. Multiple invasive plant species were noted across the project area during field surveys. While invasive species is not listed as a threatening process for G. hockingsii (DETSI, 2025), several of the larger and more competitive invasive weed species (ie. Lantana, african fountain grass, etc) are likely to have the potential to establish and outcompete G. hockingsii. As all individuals within the project area will require clearing as part of the proposed works, these indirect impacts from competition are most relevant to G. hockingsii adjacent to the Project and those that will be planted as per the proposed G. hockingsii Management Plan. That said, the proposed Management Plan will provide recommendations for identification and management of weeds and pests that may threaten the population. As such, the project is considered unlikely to result in invasive species that are harmful to a vulnerable species becoming established in the vulnerable species’ habitat. While Grevillea species are generally considered hardy species, they can be susceptible to a few fungal infections. These include root rot, powdery mildew and cinnamon fungus. The above fungal infections are generally related to poor soil drainage, high humidity and stagnant air conditions. As the project area is confined to Upper Mundic Gully, the Project is unlikely to impact these abiotic variables within adjacent areas. As such, the Project is considered unlikely to
Result in genetically distinct
Unlikely
populations forming as a result of habitat isolation;
Result in invasive species that are harmful to a vulnerable species becoming established in the vulnerable species’ habitat;
Unlikely
Introduce disease that may cause the population to decline.
Unlikely
Project number: 25B061
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