How scientists are using blood-sucking jungle leeches to track elusive, endangered mammal species
In short: Tracking rare animals usually requires expensive radio tags and camera traps. But researchers on a 2015 expedition to Cambodia discovered a bizarre, low-cost alternative: the humble leech. By sequencing the DNA found inside the guts of these blood-thirsty parasites, scientists can now identify exactly which mammals inhabit a forest.
During the 2015 Constantine S. Niarchos Expedition, a team of scientists ventured into the Cambodian wilderness to study Haemadipsida, a family of terrestrial, jawed leeches. While their primary goal was to document biodiversity, the researchers were also interested in the 'bycatch'—the remnants of mammalian blood stored within the leeches' digestive tracts. Because these parasites can preserve a blood meal for months, they act as living, mobile biological archives of the local fauna.
Back at the American Museum of Natural History, researchers sequenced the DNA extracted from the leeches' gut contents. By comparing these sequences against existing biological databases, the team could identify the specific mammals the leeches had bitten. This process, known as IDNA testing, offers a significant advantage over traditional monitoring techniques. While methods like radio tagging and camera traps are often time-consuming and costly, collecting leeches from the forest floor provides a rapid, efficient snapshot of an ecosystem's inhabitants.
Michael Tessler, a Ph.D. student at the Museum’s Richard Gilder Graduate School, notes that this method allows researchers to enter a forest for just a single day, gather specimens, and quickly determine which mammals are present. The findings from the Cambodian expedition are now helping conservationists refine this technique. By establishing benchmarks for the necessary number of leeches and species required for an accurate survey, the team is turning a simple, albeit uncomfortable, encounter with parasites into a powerful tool for modern wildlife conservation.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Tell-Tale Leech Meals
To cite this card, link to https://intellectplus.co.uk/app/ideas-tell-tale-leech-meals.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
