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Found 184 Resources

Laysan Island, T. J. Lewis, 1966

Smithsonian Field Book Project
This memoranda book contains the bird banding lists of T. James Lewis, from his work with the Pacific Ocean Biological Survey on Laysan Island in 1966. Banding lists include band numbers 587-80468 to 767-43301.

Polygala jefensis W.H. Lewis

NMNH - Botany Dept.

James T. Powers

National Portrait Gallery

Butterfly genome reveals promiscuous exchange of mimicry adaptations among species

Smithsonian Libraries
The evolutionary importance of hybridization and introgression has long been debated(1). Hybrids are usually rare and unfit, but even infrequent hybridization can aid adaptation by transferring beneficial traits between species. Here we use genomic tools to investigate introgression in Heliconius, a rapidly radiating genus of neotropical butterflies widely used in studies of ecology, behaviour, mimicry and speciation(2-5). We sequenced the genome of Heliconius melpomene and compared it with other taxa to investigate chromosomal evolution in Lepidoptera and gene flow among multiple Heliconius species and races. Among 12,669 predicted genes, biologically important expansions of families of chemosensory and Hox genes are particularly noteworthy. Chromosomal organization has remained broadly conserved since the Cretaceous period, when butterflies split from the Bombyx (silkmoth) lineage. Using genomic resequencing, we show hybrid exchange of genes between three co-mimics, Heliconius melpomene, Heliconius timareta and Heliconius elevatus, especially at two genomic regions that control mimicry pattern. We infer that closely related Heliconius species exchange protective colour-pattern genes promiscuously, implying that hybridization has an important role in adaptive radiation.

James T. Powers in "Two Little Brides"

National Portrait Gallery

Tenskwatawa ["The Prophet"]

National Portrait Gallery

Amiskquew - A Menominie Chief

National Portrait Gallery

Pee-che-kir - A Chippewa Chief

National Portrait Gallery


National Portrait Gallery
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