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Lord Howe Island Sees Surge in Invertebrate Life Following Rodent Eradication
Booming cockroach numbers welcome news on this 'paradise of creatures'
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A recent study reveals a significant increase in invertebrate populations, including native cockroaches, on Lord Howe Island after the successful removal of invasive rodents in 2019. The research highlights the role of these invertebrates in maintaining the island's ecosystem health.
- 01Invertebrate numbers on Lord Howe Island have surged by approximately 60% since the eradication of invasive rodents.
- 02The study, co-led by Sydney University student Maxim Adams, collected 15,000 invertebrate specimens in 2023, compared to 9,000 in the initial survey.
- 03Larger invertebrates, such as bush cockroaches and isopods, showed the most significant increases, providing essential food for native predators.
- 04One species of cockroach, previously thought extinct, was rediscovered in 2023, indicating a resurgence in biodiversity.
- 05Future studies will focus on the impact of these changes on higher-order predators, including geckos.
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A study published in *Biological Invasions* highlights a remarkable increase in invertebrate life on Lord Howe Island following the eradication of over 300,000 invasive rodents in 2019. The research, led by Sydney University honours student Maxim Adams in collaboration with the New South Wales Department of Climate Change, Energy, the Environment and Water (DCCEEW), found that invertebrate populations have risen by approximately 60%. The team collected 15,000 specimens in 2023, a significant increase from the 9,000 specimens gathered before the rodent removal. Larger invertebrates, such as bush cockroaches and isopods, have thrived, playing a crucial role in nutrient recycling and serving as food for native predators. Notably, a cockroach species once thought extinct was rediscovered, signaling a positive shift in biodiversity. While the ecosystem is unlikely to revert to its pre-rodent state, these findings suggest a new equilibrium is forming, with ongoing studies planned to assess the effects on higher-order predators like geckos.
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The resurgence of invertebrates is vital for the ecological balance on Lord Howe Island, enhancing nutrient recycling and supporting native wildlife.
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