Trees may have a ‘heartbeat’ that is so slow we never noticed it A high-precision, three-dimensional survey of 21 different species of trees has revealed an as-yet unknown cycle of subtle canopy movement during the night. Such ‘sleep cycles’ differed from one species to another. Detection of anomalies in overnight movement could become a future diagnostic tool to reveal stress or disease in crops. Trees may have a ‘heartbeat’ that is so slow we never noticed it
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