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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.
4. Pyle, P. (1997). Identification Guide to North American Birds, Part I: Columbidae to Ploceidae. Slate Creek Press, Bolinas, CA, USA.
5. Dwight, J., Jr. (1900). The sequence of plumages and moults of the passerine birds of New York. Annals of the New York Academy of Sciences 13:73-360.
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.
11. Humphrey, P. S., and K. C. Parkes (1959). An approach to the study of molts and plumages. Auk 76:1-31.
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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14. Enders, F. and W. Post. (1971). White-spotting in the genus Ammospiza and other grassland sparrows. Bird-Banding 42:210-219.
15. Pyle, P., and M. McPherson (2017). Why so many white Eared Grebes? Birding 49:58-65.
16. Wayne, A. T. 1924. Albinism in Sharp-tailed Sparrow. Auk 41:346-347.
17. Ross, C. C. (1963). Albinism among North American birds. Cassinia 47:2-21.
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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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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36. Greenlaw, J. S. (2008). Saltmarsh Sharp-tailed Sparrow, Ammodramus caudacutus. In The Second Atlas of Breeding Birds in New York State (K. J. McGowan and K. Corwin, Eds.). Cornell University Press, Ithaca NY, pp. 560-561.
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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
42. Bishop, L. B. (1901). A new Sharp-tailed Finch from North Carolina. Auk 18:269-270.
43. Wetmore, A. (1944). Records of Sharp-tailed Sparrows from Maryland and Virginia in the National Museum. Auk 61 (1):132-133.
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47. Greenlaw, J. S. and G. E. Woolfenden. (2007). Wintering distributions and migration of Saltmarsh and Nelson's sharp-tailed sparrows. Wilson Journal of Ornithology 119 (3):361-377.
48. Rising, J. D. and J. Avise. (1993). An application of genealogical concordance principles to the taxonomy and evolutionary history of the Sharp-tailed Sparrow (Ammodramus caudacutus). Auk 110:844-856.
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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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