Managing invasive plants on sub-Antarctic Macquarie Island

Macquarie Island faces significant threats from invasive plant species introduced through human activity. Only three species—Poa annua, Stellaria media, and Cerastium fontanum—are well-established, with strict biosecurity measures in place to prevent further introductions. Research indicates that these weeds, though palatable, may have been suppressed by rabbit grazing. Post-rabbit eradication, weed proliferation could disrupt the island's ecosystem structure and function, necessitating targeted control strategies. The study proposes integrating both non-native plant and herbivore management for effective restoration. While S. media shows promise for easier management or potential eradication due to its limited distribution, knowledge gaps remain regarding soil seed banks, population dynamics post-eradication, and herbicide impacts in cold conditions. Ongoing research addresses these gaps, including studies on herbicide movement and fate in Macquarie Island's unique environment, despite logistical challenges.

Sindel, B. M., Kristiansen, P. E., Wilson, S. C., Shaw, J. D., & Williams, L. K. (2018). Managing invasive plants on sub-Antarctic Macquarie Island. The Rangeland Journal, 39(6), 537–549. https://doi.org/10.1071/rj17073