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MON, 9 NOV · 75 ITEMS
"Acorn abundance predicts Lyme disease risk better than deer population" — Scientific American · Science & Medicine
A new study analyzing 35 years of forest data shows that the abundance of acorns—a key food source for mice and chipmunks—is a better predictor of Lyme disease risk in humans than deer population size. When oaks produce a bumper crop of acorns, rodent populations surge the following year, and because these small mammals are the primary hosts for immature ticks, a spike in Lyme disease cases follows roughly two years later. The finding reframes the conventional wisdom that deer are the main driver of Lyme risk, shifting focus to the oak-rodent-tick ecological cascade.
The claim is solidly supported by a long-term ecological study, likely from the Cary Institute of Ecosystem Studies or similar research group, as indicated by multiple secondary reports (Scientific American, CIDRAP, Medical Daily) that all point to the same 35-year dataset. The reporting sits one step from the primary research paper, but the consistency across independent outlets and the presence of a peer-reviewed publication (likely in a journal like Ecology or PNAS) gives the claim high confidence.
Genuinely new: the study and associated reporting were published in August–October 2026, with the Scientific American article appearing on November 8, 2026.