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1. Walsh, J., W. G. Shriver, B. J. Olsen, K. M. O'Brien, and A. I. Kovach. (2015). Relationship of phenotypic variation and genetic admixture in the Saltmarsh-Nelson's sparrow hybrid zone. Auk 132 (3):704-716. doi: 10.1642/auk-14-299.1. https://doi.org/10.1642/auk-14-299.1
2. Pyle, P., and D. A. Sibley (1992). Juvenal-plumaged Le Conte's Sparrows on migration: Are they being overlooked? Birding 24:70-76.
3. Sibley, D. 1996. Field identification of the sharp-tailed sparrow complex. Birding 28 (3):196-208.
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6. Ridgway, R. (1901). The birds of North and Middle America, Part 1. United States National Museum Bulletin 50.
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9. Rising, J. D. (1996). A Guide to the Identification and Natural History of the Sparrows of the United States and Canada. Academic Press, NY, USA.
10. Woolfenden, G. E. 1956. Comparative breeding behavior of Ammospiza caudacuta and A. maritima. Univ. Kansas Publ. Mus. Nat. Hist. 10 (2):45-75.
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12. Howell, S. N. G., C. Corben, P. Pyle, and D. I. Rogers (2003). The first basic problem: A review of molt and plumage homologies. Condor 105:635–653.
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15. Pyle, P., and M. McPherson (2017). Why so many white Eared Grebes? Birding 49:58-65. http://www.birdpop.org/docs/pubs/Pyle_and_McPherson_2017_Why_So_Many_White_Eared_Grebes.pdf
16. Wayne, A. T. 1924. Albinism in Sharp-tailed Sparrow. Auk 41:346-347.
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18. Howell, S. N. G., C. Corben, P. Pyle, and D. I. Rogers (2004). The first basic problem revisited: Reply to commentaries on Howell et al. (2003). Condor 106:206–210.
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24. Pyle, P. (1997). Molt limits in North American passerines. North American Bird Bander 22:49-89.
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26. Borowske, A. C. (2015). Effects of life history strategies on annual events and processes in the lives of tidal marsh sparrows. Ph.D. dissertation, University of Connecticut, Storrs, CT.
27. Montagna, W. (1942). The Sharp-tailed Sparrows of the Atlantic coast. Wilson Bulletin 54:107-120.
28. Post, W. and J. S. Greenlaw. (2009). Seaside Sparrow (Ammodramus maritimus), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.127
29. Greenberg, R. (2006). Tidal marshes: Home for the few and the highly selected. Pp. 2-9 In Terrestrial Vertebrates of Tidal Marshes: Evolution, Ecology, and Conservation (R. Greenberg, J. E. Maldonado, S. Droege, and M. V. McDonald, Eds.). Studies in Avian Biology, no. 32.
30. Benoit, L. K. and R. A. Askins. (2002). Relationship between habitat area and the distribution of tidal marsh birds. Wilson Bulletin 114 (3):314-323.
31. Hill, C. E., S. Tomko, C. Hagen, N. A. Schable, and T. C. Glenn. (2008). Novel microsatellite markers for the Saltmarsh Sharp-tailed Sparrow, Ammodramus caudacutus (Aves: Passeriformes). Molecular Ecology Resources 8 (1):113-115. doi: 10.1111/j.1471-8286.2007.01885.x. https://doi.org/10.1111/j.1471-8286.2007.01885.x
32. Walsh, J., A. I. Kovach, K. J. Babbitt, and K. M. O'Brien. (2012). Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow (Ammodramus caudacutus). Auk 129 (2):247-258. doi: 10.1525/auk.2012.11153. https://doi.org/10.1525/auk.2012.11153
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41. Wiest, W. A., M. D. Correll, B. J. Olsen, C. S. Elphick, T. P. Hodgman, D. R. Curson, and W. G. Shriver. (2016). Population estimates for tidal marsh birds of high conservation concern in the northeastern USA from a design-based survey. Condor 118 (2):274-288. doi: 10.1650/condor-15-30.1. https://doi.org/10.1650/condor-15-30.1
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65. Walsh, J., A. I. Kovach, O. P. Lane, K. M. O'Brien, and K. J. Babbitt. (2011). Genetic barcode RFLP analysis of the Nelson’s and Saltmarsh sparrow hybrid zone. Wilson Journal of Ornithology 123 (2):316-322. doi: 10.1676/10-134.1. https://doi.org/10.1676/10-134.1
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67. Walsh, J., B. J. Olsen, K. J. Ruskin, W. G. Shriver, K. M. O'Brien, and A. I. Kovach. (2016). Extrinsic and intrinsic factors influence fitness in an avian hybrid zone. Biological Journal of the Linnean Society 119 (4):890-903. doi: 10.1111/bij.12837. https://doi.org/10.1111/bij.12837
68. Walsh, J., R. J. Rowe, B. J. Olsen, W. G. Shriver, and A. I. Kovach. (2016). Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds. Ecology and Evolution 6 (1):279-294. doi: 10.1002/ece3.1864. https://doi.org/10.1002/ece3.1864
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73. Walsh, J., W. G. Shriver, M. D. Correll, B. J. Olsen, C. S. Elphick, T. P. Hodgman, R. J. Rowe, K. M. O'Brien, and A. I. Kovach. (2017). Temporal shifts in the saltmarsh-Nelson's sparrow hybrid zone revealed by replicated demographic and genetic surveys. Conservation Genetics 18 (2):453-466. doi: 10.1007/s10592-016-0920-8. https://doi.org/10.1007/s10592-016-0920-8
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