One full year of change in the Amazon upper forest canopy, seen from one of the research team's cameras on a tower north outside Manaus, Brazil. The letters on the bottom correspond to months of the year. New leaves are produced mostly in the five driest months, at the end of the year. This imposes a strong seasonality on the average leaf age of the canopy, with leaves being older and less photosynthetically efficient in the late wet to early dry season.

Credit: B. Nelson/INPA

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