Examining the Gilbert's Potoroo's Diet
June 2, 3:00 PM
To locate new habitats and understand the eating habits of one of the world's most endangered mammals, researchers have applied environmental DNA metabarcoding to the droppings of the Gilbert's potoroo and other species. The Gilbert's potoroo (Potorous gilbertii) is a small marsupial native to Western Australia. Listed as critically endangered on the International Union for Conservation of Nature (IUCN) Red List, its precarious status has sparked serious concern among conservationists.
Led by primary author Rebecca Qua, the team collected fecal samples from potoroos, quokkas, bandicoots, and bush rats between 2003 and 2024. Through eDNA metabarcoding, they identified 456 genetic variants of fungi, with 115 singled out as targeted food sources. The potoroo droppings alone contained 105 fungal variants. The findings revealed that over 90% of the Gilbert's potoroo's diet is made up of underground fungi.
Dietary Analysis and Population Conservation
The dietary analysis showed that quokkas have a significantly different diet from the potoroo. In certain areas, the potoroo's feeding patterns more closely resembled those of bandicoots or bush rats. Scientists now suggest monitoring the presence of three mammal species—quokkas, bandicoots, and rats—as a combined indicator, which could aid in conserving the Gilbert's potoroo population.
“Our goal is to restore the species through translocations—moving organisms from one location to another to create an insurance population in case something happens to their existing populations.”
Rebecca Qua
She also emphasized that “this is a non-invasive way to study diet. All you need is fresh feces from the environment.” This approach could mark a critical step in safeguarding this critically endangered species.
The study highlights the importance of applying modern techniques to monitor endangered species and their ecosystems. As natural environments undergo rapid change, such innovative methods not only shed light on the dietary preferences of the Gilbert's potoroo but also pave the way for effective conservation strategies. The implications of this research extend beyond Australia, contributing to global biodiversity preservation efforts.