Technical Comments

Comment on “The Response of Vegetation on the Andean Flank in Western Amazonia to Pleistocene Climate Change”

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Science  30 Sep 2011:
Vol. 333, Issue 6051, pp. 1825
DOI: 10.1126/science.1207525

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Cárdenas et al. (Reports, 25 February 2011, p. 1055) used the presence of Podocarpus pollen and wood to infer ≥5°C cooling of Andean forests during Quaternary glacial periods. We show that (i) Podocarpus has a wide elevation range in the Neotropics, and (ii) edaphic factors cannot be discounted as a factor governing its distribution. Paleoecologists should therefore reevaluate Podocarpus as a cool-temperature proxy.

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