Lizard vs Predator: geckos and skinks find sanctuary behind mammal-proof fences

Embargoed until: Publicly released: 2023-10-24 03:00

New Zealand

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There are 124 lizard species in Aotearoa that aren't found anywhere else in the world. Most of them are either threatened or at risk, and their biggest threat is predation from introduced mammals. Even common lizard species could still be declining in number, and may become threatened if their populations aren't carefully managed. Researchers measured the populations of three common lizard species 1 year before and 5 years after mammal predators (including mice) were removed from a sanctuary area in the Aldinga Conservation Area near Alexandra. Counts of all three species showed the benefits of predator removal, and the gecko population inside the fenced area doubled in number. After the sanctuary was established, only 1% of geckos inside the fence had lost their tails, compared to 24% outside. The authors say these findings suggest that mammal predators have a significant effect on common lizard species, and show that there is potential for lizard species recovery where predators are removed.