• Call for Physical Sciences Papers
  • Science Sessions: The PNAS Podcast Program
October 27, 2009; 106 (43)

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Cover image expansion

Cover image: Pictured is the mural “Oak Family Tree,” from the University of California, Davis, Arboretum's oak collection. The mural, created through the University of California, Davis, Art/Science Fusion program, depicts the evolutionary relationships of 29 oak species and the animals associated with each species. Ian S. Pearse and Andrew L. Hipp report a phylogenetic analysis of native and non-native oaks and seek to understand why insect herbivores interact with some introduced plant species more than others. See the article by Pearse and Hipp, which is part of the Plant and Insect Biodiversity Special Feature, on pages 18097–18102. Image courtesy of Allan Jones (University of California, Davis, CA).

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