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Spatial distribution of 875 tropical forest samples including either animals or trees that were drawn from the Ecological Register. The tropics of Cancer and Capricorn are indicated. The pattern mirrors the known distribution of field-based research campaigns in the tropics (19), but this dataset is more dispersed than the one used in a recent, related study (8) because the number of consulted references is greater (605 for the tropics alone vs. 284 for the globe).
