Our cities are complex places of work, industry and residential activities. This often makes it hard to pin down the spread of different contaminants throughout them.
In contrast, less populated locations and larger areas of parks or farms had higher levels of manganese. This likely came from natural soil sources andBees effectively collect environmental samples and bring them back to hives across the city. Credit: Mark Patrick Taylor
We also examined how bees can help us understand emerging concerns such as the spread of antimicrobial resistance genes. It's a key concern in urban areas, driven by the misuse and overuse of antibiotics. We found these AMR genes were common across Sydney—83% of bees examined had ingested one or more of the genes we looked for. The source was not strongly linked to industrial activity, but rather the area of water bodies available for the bees to drink from. This may be because these genes can enter the environment through human wastewater and runoff and then be absorbed by foraging bees.We also wanted to know if bees that contained contaminants were actually ingesting them.
Using high-resolution imaging, we found only organic non-metal particles on the outside of bees. This may be because bees have very good self-cleaning habits. These behaviors also keep hives free from parasites and fungi brought in by foraging bees.
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