How Removing Rats Sparked a Surprising Invertebrate Comeback
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📰 The quick summary: After invasive rats and mice were removed from Lord Howe Island in 2019, a new study confirms that invertebrate populations have surged, signaling a broader ecological recovery on the world’s largest inhabited island to undergo such an eradication effort.
📈 One key stat: Researchers collected more than 24,000 invertebrate specimens from 20 forest locations, revealing the strongest population gains among larger species measuring more than 13 millimeters, a clear sign that rodent predation had suppressed these animals for over a century.
💬 One key quote: “Invertebrates are easy to overlook, but they are absolutely fundamental to how ecosystems function,” said Maxim Adams, PhD candidate at the University of Sydney and lead author of the study.
1️⃣ The big picture: Lord Howe Island, a small Australian island in the Tasman Sea, completed the world’s largest rodent eradication program on an inhabited island in 2019, removing invasive black rats and house mice that had reshaped the island’s ecology for well over a century. A new study published in Biological Invasions now offers the first comprehensive look at how the island’s invertebrate communities responded to that intervention. Researchers compared samples collected before the eradication in 2016 to 2017 with those gathered in 2023 to 2024, drawing on more than 24,000 specimens from 20 forest sites. Overall invertebrate abundance increased significantly, with the largest gains recorded among bigger-bodied species like bush cockroaches and woodlice that were once heavily preyed upon by rodents. These findings add to earlier reports of strong recoveries among seabirds and native land birds, painting a picture of an island ecosystem steadily reorganizing itself.
2️⃣ Why is this good news: Invertebrates form the backbone of healthy ecosystems, pollinating plants, recycling nutrients, breaking down organic matter, and feeding birds and reptiles, so their rebound is a strong signal that Lord Howe Island’s broader ecological recovery is genuinely underway. The dramatic increases among larger invertebrates confirm that removing a long-standing invasive predator can allow suppressed species to recover, offering real hope for other islands facing similar conservation challenges. As invertebrate populations grow, they in turn support native predators like geckos and insect-eating birds, creating a positive feedback loop that strengthens the entire food web. The study also demonstrates that even relatively straightforward monitoring approaches can detect meaningful ecological change after conservation interventions, making this a practical model for conservation programs worldwide. Beyond Lord Howe Island, these results reinforce the case for ambitious invasive species removal efforts on islands globally, where some of the planet’s most unique and threatened biodiversity survives.
3️⃣ What’s next: Future research will use genetic techniques to identify exactly which native and introduced species are increasing and to determine whether ecological changes vary across different feeding groups or habitats. Researchers also plan to examine longer-term effects on soil nutrients and decomposition processes, both of which are strongly shaped by invertebrate activity. Monitoring will continue over years and potentially decades, since full ecosystem recovery after invasive species removal can take a very long time.
Read the full story here: SciTechDaily – World’s Largest Island Rodent Eradication Sparks Remarkable Invertebrate Comeback
