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Journal of Heredity 2004:95(2):127-135
© 2004 The American Genetic Association

Patterns of Genetic Structure among Populations of an Oligophagous Pollinating Yucca Moth (Tegeticula yuccasella)

J. Leebens-Mack, and O. Pellmyr

From the Department of Biology, 612 Mueller Laboratory, Pennsylvania State University, University Park, PA 16802 (Leebens-Mack), and from the Department of Biological Sciences, University of Idaho, P.O. Box 443051, Moscow, ID 83844-3051 (Pellmyr). Specimens, site information, and field assistance were generously provided by E. Augenstein, J. Berger, M. Brock, R. Brown, K. Clary, R. Hagen, J. Keyes, D. McCauley, E. Menges, K. Olsen, G. Uetz, and D. Wagner. Permission to collect moths was kindly provided by Archbold Biological Station and Withlacochee State Forest. REU students P. Johnson, M. Lacey, J. Keyes, and E. Weiss provided help with DNA sequencing. We greatly appreciate helpful comments on our manuscript provided by D. Althoff, A. Porter, K. Segraves, R. DeSalle and two anonymous reviewers. The work was funded by a grant from the National Geographic Society and by National Science Foundation grants, with REU (Research Experiences for Undergraduates) supplements from the Ecology and Systematic Biology programs.

Address correspondence to Jim Leebens-Mack at the address above, or e-mail: jleebensmack{at}psu.edu.

Plant-insect associations have served as models for investigations of coevolution and the influence of biotic interactions on diversification. The pollination association between yuccas and yucca moths is a classic example of an obligate mutualism often suggested to have been affected by coevolution. Recent work has shown high host specificity in pollinating yucca moths, and here we use Tegeticula yuccasella, the species with the widest diet breadth, to ask how host specificity and isolation by distance contribute to specialization. Isolation by distance at a regional scale was observed in nucleotide variation within the mitochondrial gene cytochrome oxidase I (COI) (r =.294; P =.003). Host-related genetic structure (Fct = 0.08) was found to be slightly lower than the level of structure observed between eastern and western moth populations (Fct = 0.096). However, 56% of the COI haplotypes sampled from moths on Yucca filamentosa mapped to a host-specific clade in the haplotype network. Taken together, these results suggest that differentiation among T. yuccasella populations on alternative hosts is slight, but gene flow is influenced by both host association and geographic distance.


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