Abstract
A genetic boundary at the Mississippi River, USA, has been suggested for the Northern Leopard Frog, Rana pipiens, which was recently proposed for listing as federally threatened in the western USA. This suggestion was made on the basis of limited geographic sampling of a mitochondrial gene. However, mitochondrial DNA represents a very small part of the genome and is not necessarily indicative of patterns in nuclear DNA. We tested the hypothesis that eastern and western populations are separated by a distinct genetic boundary by sequencing mitochondrial DNA more extensively across the range, including focused sampling in the zone of hypothetical introgression, and by analyzing four nuclear sequences and seven microsatellite loci. We confirmed previous results that eastern and western populations have unique mitochondrial sequences that are deeply divergent (3.8 %) and which overlap only in a narrow region around the Mississippi River. Nuclear sequences also show divergent eastern and western lineages in some cases but with a broader zone of geographic overlap. Microsatellite data correspond closely to mitochondrial data, differing between east and west and changing abruptly near the Mississippi River. These data collectively demonstrate that eastern and western clades of this species introgress considerably in some markers but are distinct and defined by clear and narrow boundaries in others. We demonstrate that the Mississippi River forms an important, albeit somewhat permeable, boundary between genetic lineages in this species. This genetic boundary coincides with previously described discontinuities in morphological features.
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Acknowledgments
C. Drost assisted in many ways including helping acquire financial support and samples. Funding was provided by the Utah State University Ecology Center, the United States Bureau of Reclamation, and the United States Geological Survey. For help collecting or acquiring samples, we thank D. Alonso, B. and B. Alsop, C. Avenengo, A. and R. Bekintis, B. Blake, K. Boyle, C. Bubac, M. Carrick, G. Casper, A. Durso, C. Friesen, M. French, L. Gelczis, A. Gooley, D. Guericke, K. Haxton, M. Hayes, S. Jones, K. Kendell, D. Kimberling, M. Koepsel, J. Massie, M. Mazza, D. McAlpine, K. and R. Moloney, D. Penttila, D. and D. Peterson, J. Poston, R. Quinn, J. Slawson, B. Smith, L. Smith, N. Smith, A. Spriggs, and K. and K. Taylor. For help with laboratory work, we thank J. Baker, S. Bardot, C. Callahan, J. P. Chong, M. Culumber, D. Fixsen, and C. Rowe. For comments on design, analysis, and writing, we thank K. Beard, M. Pfrender, and H. Rai. The protocols used here were approved by the Utah State University Institutional Animal Care and Use Committee (approvals 1138 and 1469) and Northern Arizona University IACUC (approval 07-003). New collections were conducted under the following permissions (some samples were donated from pre-existing collections): Colorado Division of Wildlife Scientific Collection License 08HP2004A001, Illinois Scientific Permits NH09.5256 and NH10.5256, Iowa Collectors Permit SC 896, Kentucky Educational Wildlife Collecting Permit SC1011073, Michigan Scientific Collector’s Permit 16627, Montana Scientific Collector’s Permit 2010-080, Minnesota Special Permits 15676 and 16627, Nebraska Game and Parks Commission Scientific and Educational Permits 951 and 980, New Brunswick Scientific Permits SP09-004 and SP10-011, Ontario Wildlife Scientific Collector’s Authorization 1051331, Ouray National Wildlife Refuge Special Use Permit 08-002, Pennsylvania Scientific Collector Permit 457, Quebec Permis Scientifiques 2009-04-14-106-10-S–F and 2010-04-29-124-10-S–F, Rhode Island Scientific Collector’s Permit 2009-38, South Dakota Scientific Collector’s Permit 58, Utah Division of Wildlife Certificates of Registration 1COLL7519 and 1COLL7723, Wisconsin Scientific Research Licenses SRL-SCR-003-2010, and Wyoming Game and Fish Department Chapter 33 Permit 681.
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O’Donnell, R.P., Mock, K.E. Two frog species or one? A multi-marker approach to assessing the distinctiveness of genetic lineages in the Northern Leopard Frog, Rana pipiens . Conserv Genet 13, 1167–1182 (2012). https://doi.org/10.1007/s10592-012-0384-4
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DOI: https://doi.org/10.1007/s10592-012-0384-4