Canada – Across the country, students are taking conservation into their own hands by running ‘bee hotels’ that reveal complex ecological interactions. A Canada-wide study published in Metabarcoding and Metagenomics shows their efforts can produce detailed scientific data.

Some 5,000 students installed standardised ‘trap nests’ made of PVC pipes and cardboard tubes, mimicking natural cavities where cavity-nesting bees and wasps build nests. These insects play key roles in pollination and pest control but are often hard to study due to their small size and secretive habits.

Researchers Sage Handler, Nigel Raine, and Dirk Steinke of the University of Guelph used DNA metabarcoding to analyze the nests. This method identified the bee and wasp species occupying each nest, the plant pollen or insect prey they brought back as food, and even associated parasites.

The study produced tripartite networks linking nesting bees or wasps, their food sources, and parasites. “A lot of people want to contribute to conservation or learn more about biodiversity, but don’t know how. This shows that a small, practical action, like hosting a trap nest, can contribute real data that researchers can use,” said Handler.

Each brood cell acted as a tiny ecological time capsule. Students weren’t just collecting insects—they were gathering the raw material for country-wide food-web maps, creating one of the most detailed views of cavity-nesting species and their interactions ever assembled in Canada.

Podcast: Play in new window | Download